index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.3 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, no-database Delicious clone.
   6  *
   7  * Friendly fork by the Shaarli community:
   8  *  - https://github.com/shaarli/Shaarli
   9  *
  10  * Original project by sebsauvage.net:
  11  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  12  *  - https://github.com/sebsauvage/Shaarli
  13  *
  14  * Licence: http://www.opensource.org/licenses/zlib-license.php
  15  *
  16  * Requires: PHP 5.3.x
  17  */
  18
  19 // Set 'UTC' as the default timezone if it is not defined in php.ini
  20 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  21 if (date_default_timezone_get() == '') {
  22     date_default_timezone_set('UTC');
  23 }
  24
  25 /* -----------------------------------------------------------------------------
  26  * Hardcoded parameters
  27  * You should not touch any code below (or at your own risks!)
  28  * (These parameters can be overwritten by editing the file /data/config.php)
  29  * -----------------------------------------------------------------------------
  30  */
  31
  32 /*
  33  * Shaarli directories & configuration files
  34  */
  35 // Data subdirectory
  36 $GLOBALS['config']['DATADIR'] = 'data';
  37
  38 // Main configuration file
  39 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php';
  40
  41 // Link datastore
  42 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php';
  43
  44 // Banned IPs
  45 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php';
  46
  47 // Access log
  48 $GLOBALS['config']['LOG_FILE'] = $GLOBALS['config']['DATADIR'].'/log.txt';
  49
  50 // For updates check of Shaarli
  51 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt';
  52
  53 // Set ENABLE_UPDATECHECK to disabled by default.
  54 $GLOBALS['config']['ENABLE_UPDATECHECK'] = false;
  55
  56 // RainTPL cache directory (keep the trailing slash!)
  57 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  58 // Raintpl template directory (keep the trailing slash!)
  59 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  60
  61 // Thumbnail cache directory
  62 $GLOBALS['config']['CACHEDIR'] = 'cache';
  63
  64 // Atom & RSS feed cache directory
  65 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  66
  67
  68 /*
  69  * Global configuration
  70  */
  71 // Ban IP after this many failures
  72 $GLOBALS['config']['BAN_AFTER'] = 4;
  73 // Ban duration for IP address after login failures (in seconds)
  74 $GLOBALS['config']['BAN_DURATION'] = 1800;
  75
  76 // Feed options
  77 // Enable RSS permalinks by default.
  78 // This corresponds to the default behavior of shaarli before this was added as an option.
  79 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  80 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  81 $GLOBALS['config']['SHOW_ATOM'] = false;
  82
  83 // Link display options
  84 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  85 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  86 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  87
  88 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  89 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  90
  91 // Thumbnails
  92 // Display thumbnails in links
  93 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  94 // Store thumbnails in a local cache
  95 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  96
  97 // Update check frequency for Shaarli. 86400 seconds=24 hours
  98 $GLOBALS['config']['UPDATECHECK_BRANCH'] = 'stable';
  99 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400;
 100
 101
 102 /*
 103  * Plugin configuration
 104  *
 105  * Warning: order matters!
 106  *
 107  * These settings may be be overriden in:
 108  *  - data/config.php
 109  *  - each plugin's configuration file
 110  */
 111 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 112 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 113 //    'wallabag', 'markdown', 'addlink_toolbar',
 114 //);
 115 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 116
 117 // Initialize plugin parameters array.
 118 $GLOBALS['plugins'] = array();
 119
 120 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 121 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 122
 123 /*
 124  * PHP configuration
 125  */
 126 define('shaarli_version', '0.6.3');
 127
 128 // http://server.com/x/shaarli --> /shaarli/
 129 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 130
 131 // High execution time in case of problematic imports/exports.
 132 ini_set('max_input_time','60');
 133
 134 // Try to set max upload file size and read
 135 ini_set('memory_limit', '128M');
 136 ini_set('post_max_size', '16M');
 137 ini_set('upload_max_filesize', '16M');
 138
 139 // See all error except warnings
 140 error_reporting(E_ALL^E_WARNING);
 141 // See all errors (for debugging only)
 142 //error_reporting(-1);
 143
 144 /*
 145  * User configuration
 146  */
 147 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 148     require_once $GLOBALS['config']['CONFIG_FILE'];
 149 }
 150
 151 // Shaarli library
 152 require_once 'application/ApplicationUtils.php';
 153 require_once 'application/Cache.php';
 154 require_once 'application/CachedPage.php';
 155 require_once 'application/FileUtils.php';
 156 require_once 'application/HttpUtils.php';
 157 require_once 'application/LinkDB.php';
 158 require_once 'application/LinkFilter.php';
 159 require_once 'application/LinkUtils.php';
 160 require_once 'application/TimeZone.php';
 161 require_once 'application/Url.php';
 162 require_once 'application/Utils.php';
 163 require_once 'application/Config.php';
 164 require_once 'application/PluginManager.php';
 165 require_once 'application/Router.php';
 166
 167 // Ensure the PHP version is supported
 168 try {
 169     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 170 } catch(Exception $exc) {
 171     header('Content-Type: text/plain; charset=utf-8');
 172     echo $exc->getMessage();
 173     exit;
 174 }
 175
 176 // Force cookie path (but do not change lifetime)
 177 $cookie = session_get_cookie_params();
 178 $cookiedir = '';
 179 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 180     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 181 }
 182 // Set default cookie expiration and path.
 183 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 184 // Set session parameters on server side.
 185 // If the user does not access any page within this time, his/her session is considered expired.
 186 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 187 // Use cookies to store session.
 188 ini_set('session.use_cookies', 1);
 189 // Force cookies for session (phpsessionID forbidden in URL).
 190 ini_set('session.use_only_cookies', 1);
 191 // Prevent PHP form using sessionID in URL if cookies are disabled.
 192 ini_set('session.use_trans_sid', false);
 193
 194 session_name('shaarli');
 195 // Start session if needed (Some server auto-start sessions).
 196 if (session_id() == '') {
 197     session_start();
 198 }
 199
 200 // Regenerate session ID if invalid or not defined in cookie.
 201 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 202     session_regenerate_id(true);
 203     $_COOKIE['shaarli'] = session_id();
 204 }
 205
 206 include "inc/rain.tpl.class.php"; //include Rain TPL
 207 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 208 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 209
 210 $pluginManager = PluginManager::getInstance();
 211 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 212
 213 ob_start();  // Output buffering for the page cache.
 214
 215
 216 // In case stupid admin has left magic_quotes enabled in php.ini:
 217 if (get_magic_quotes_gpc())
 218 {
 219     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 220     $_POST = array_map('stripslashes_deep', $_POST);
 221     $_GET = array_map('stripslashes_deep', $_GET);
 222     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 223 }
 224
 225 // Prevent caching on client side or proxy: (yes, it's ugly)
 226 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 227 header("Cache-Control: no-store, no-cache, must-revalidate");
 228 header("Cache-Control: post-check=0, pre-check=0", false);
 229 header("Pragma: no-cache");
 230
 231 // Handling of old config file which do not have the new parameters.
 232 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 233 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 234 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 235 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 236 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 237 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 238 // I really need to rewrite Shaarli with a proper configuation manager.
 239
 240 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 241     // Ensure Shaarli has proper access to its resources
 242     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 243
 244     if ($errors != array()) {
 245         $message = '<p>Insufficient permissions:</p><ul>';
 246
 247         foreach ($errors as $error) {
 248             $message .= '<li>'.$error.'</li>';
 249         }
 250         $message .= '</ul>';
 251
 252         header('Content-Type: text/html; charset=utf-8');
 253         echo $message;
 254         exit;
 255     }
 256
 257     // Display the installation form if no existing config is found
 258     install();
 259 }
 260
 261 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 262 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 263 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 264
 265 // a token depending of deployment salt, user password, and the current ip
 266 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 267
 268 autoLocale(); // Sniff browser language and set date format accordingly.
 269 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 270
 271 //==================================================================================================
 272 // Checking session state (i.e. is the user still logged in)
 273 //==================================================================================================
 274
 275 function setup_login_state() {
 276         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 277             return true;
 278         }
 279         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 280         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 281         if (!isset($GLOBALS['login'])) {
 282             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 283             $loginFailure = true;
 284         }
 285         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 286             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 287             !$loginFailure)
 288         {
 289             fillSessionInfo();
 290             $userIsLoggedIn = true;
 291         }
 292         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 293         if (empty($_SESSION['uid']) ||
 294             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 295             time() >= $_SESSION['expires_on'])
 296         {
 297             logout();
 298             $userIsLoggedIn = false;
 299             $loginFailure = true;
 300         }
 301         if (!empty($_SESSION['longlastingsession'])) {
 302             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 303         }
 304         else {
 305             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 306         }
 307         if (!$loginFailure) {
 308             $userIsLoggedIn = true;
 309         }
 310
 311         return $userIsLoggedIn;
 312 }
 313 $userIsLoggedIn = setup_login_state();
 314
 315
 316 // ------------------------------------------------------------------------------------------
 317 // Sniff browser language to display dates in the right format automatically.
 318 // (Note that is may not work on your server if the corresponding local is not installed.)
 319 function autoLocale()
 320 {
 321     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 322     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 323     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 324         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 325             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 326             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 327                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 328                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 329                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 330         }
 331     }
 332     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 333 }
 334
 335 // ------------------------------------------------------------------------------------------
 336 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 337 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 338 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 339 function pubsubhub()
 340 {
 341     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 342     {
 343        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 344        $topic_url = array (
 345                        index_url($_SERVER).'?do=atom',
 346                        index_url($_SERVER).'?do=rss'
 347                     );
 348        $p->publish_update($topic_url);
 349     }
 350 }
 351
 352 // ------------------------------------------------------------------------------------------
 353 // Session management
 354
 355 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 356 function allIPs()
 357 {
 358     $ip = $_SERVER["REMOTE_ADDR"];
 359     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 360     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 361     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 362     return $ip;
 363 }
 364
 365 function fillSessionInfo() {
 366         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 367         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 368         $_SESSION['username']=$GLOBALS['login'];
 369         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 370 }
 371
 372 // Check that user/password is correct.
 373 function check_auth($login,$password)
 374 {
 375     $hash = sha1($password.$login.$GLOBALS['salt']);
 376     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 377     {   // Login/password is correct.
 378                 fillSessionInfo();
 379         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login successful');
 380         return True;
 381     }
 382     logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 383     return False;
 384 }
 385
 386 // Returns true if the user is logged in.
 387 function isLoggedIn()
 388 {
 389     global $userIsLoggedIn;
 390     return $userIsLoggedIn;
 391 }
 392
 393 // Force logout.
 394 function logout() {
 395     if (isset($_SESSION)) {
 396         unset($_SESSION['uid']);
 397         unset($_SESSION['ip']);
 398         unset($_SESSION['username']);
 399         unset($_SESSION['privateonly']);
 400     }
 401     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 402 }
 403
 404
 405 // ------------------------------------------------------------------------------------------
 406 // Brute force protection system
 407 // Several consecutive failed logins will ban the IP address for 30 minutes.
 408 if (!is_file($GLOBALS['config']['IPBANS_FILENAME'])) file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>");
 409 include $GLOBALS['config']['IPBANS_FILENAME'];
 410 // Signal a failed login. Will ban the IP if too many failures:
 411 function ban_loginFailed()
 412 {
 413     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 414     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 415     $gb['FAILURES'][$ip]++;
 416     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 417     {
 418         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 419         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 420     }
 421     $GLOBALS['IPBANS'] = $gb;
 422     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 423 }
 424
 425 // Signals a successful login. Resets failed login counter.
 426 function ban_loginOk()
 427 {
 428     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 429     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 430     $GLOBALS['IPBANS'] = $gb;
 431     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 432 }
 433
 434 // Checks if the user CAN login. If 'true', the user can try to login.
 435 function ban_canLogin()
 436 {
 437     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 438     if (isset($gb['BANS'][$ip]))
 439     {
 440         // User is banned. Check if the ban has expired:
 441         if ($gb['BANS'][$ip]<=time())
 442         {   // Ban expired, user can try to login again.
 443             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 444             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 445             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 446             return true; // Ban has expired, user can login.
 447         }
 448         return false; // User is banned.
 449     }
 450     return true; // User is not banned.
 451 }
 452
 453 // ------------------------------------------------------------------------------------------
 454 // Process login form: Check if login/password is correct.
 455 if (isset($_POST['login']))
 456 {
 457     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 458     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 459     {   // Login/password is OK.
 460         ban_loginOk();
 461         // If user wants to keep the session cookie even after the browser closes:
 462         if (!empty($_POST['longlastingsession']))
 463         {
 464                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 465             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 466             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 467
 468             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 469             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 470             // Note: Never forget the trailing slash on the cookie path!
 471             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 472         }
 473         else // Standard session expiration (=when browser closes)
 474         {
 475             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 476             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 477             session_regenerate_id(true);
 478         }
 479
 480         // Optional redirect after login:
 481         if (isset($_GET['post'])) {
 482             $uri = '?post='. urlencode($_GET['post']);
 483             foreach (array('description', 'source', 'title') as $param) {
 484                 if (!empty($_GET[$param])) {
 485                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 486                 }
 487             }
 488             header('Location: '. $uri);
 489             exit;
 490         }
 491
 492         if (isset($_GET['edit_link'])) {
 493             header('Location: ?edit_link='. escape($_GET['edit_link']));
 494             exit;
 495         }
 496
 497         if (isset($_POST['returnurl'])) {
 498             // Prevent loops over login screen.
 499             if (strpos($_POST['returnurl'], 'do=login') === false) {
 500                 header('Location: '. escape($_POST['returnurl']));
 501                 exit;
 502             }
 503         }
 504         header('Location: ?'); exit;
 505     }
 506     else
 507     {
 508         ban_loginFailed();
 509         $redir = '';
 510         if (isset($_GET['post'])) {
 511             $redir = '?post=' . urlencode($_GET['post']);
 512             foreach (array('description', 'source', 'title') as $param) {
 513                 if (!empty($_GET[$param])) {
 514                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 515                 }
 516             }
 517         }
 518         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 519         exit;
 520     }
 521 }
 522
 523 // ------------------------------------------------------------------------------------------
 524 // Misc utility functions:
 525
 526 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 527 function return_bytes($val)
 528 {
 529     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 530     switch($last)
 531     {
 532         case 'g': $val *= 1024;
 533         case 'm': $val *= 1024;
 534         case 'k': $val *= 1024;
 535     }
 536     return $val;
 537 }
 538
 539 // Try to determine max file size for uploads (POST).
 540 // Returns an integer (in bytes)
 541 function getMaxFileSize()
 542 {
 543     $size1 = return_bytes(ini_get('post_max_size'));
 544     $size2 = return_bytes(ini_get('upload_max_filesize'));
 545     // Return the smaller of two:
 546     $maxsize = min($size1,$size2);
 547     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 548     return $maxsize;
 549 }
 550
 551 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 552     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 553     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 554 function linkdate2timestamp($linkdate)
 555 {
 556     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 557         $Y=$M=$D=$h=$m=$s=0;
 558         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 559         return mktime($h,$m,$s,$M,$D,$Y);
 560     }
 561     return time();
 562 }
 563
 564 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 565     (used to build the pubDate attribute in RSS feed.)  */
 566 function linkdate2rfc822($linkdate)
 567 {
 568     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 569 }
 570
 571 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 572     (used to build the updated tags in ATOM feed.)  */
 573 function linkdate2iso8601($linkdate)
 574 {
 575     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 576 }
 577
 578 // ------------------------------------------------------------------------------------------
 579 // Token management for XSRF protection
 580 // Token should be used in any form which acts on data (create,update,delete,import...).
 581 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 582
 583 // Returns a token.
 584 function getToken()
 585 {
 586     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 587     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 588     return $rnd;
 589 }
 590
 591 // Tells if a token is OK. Using this function will destroy the token.
 592 // true=token is OK.
 593 function tokenOk($token)
 594 {
 595     if (isset($_SESSION['tokens'][$token]))
 596     {
 597         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 598         return true; // Token is OK.
 599     }
 600     return false; // Wrong token, or already used.
 601 }
 602
 603 // ------------------------------------------------------------------------------------------
 604 /* This class is in charge of building the final page.
 605    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 606    p = new pageBuilder;
 607    p.assign('myfield','myvalue');
 608    p.renderPage('mytemplate');
 609
 610 */
 611 class pageBuilder
 612 {
 613     private $tpl; // RainTPL template
 614
 615     function __construct()
 616     {
 617         $this->tpl = false;
 618     }
 619
 620     /**
 621      * Initialize all default tpl tags.
 622      */
 623     private function initialize()
 624     {
 625         $this->tpl = new RainTPL;
 626
 627         try {
 628             $version = ApplicationUtils::checkUpdate(
 629                 shaarli_version,
 630                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 631                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 632                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 633                 isLoggedIn(),
 634                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 635             );
 636             $this->tpl->assign('newVersion', escape($version));
 637             $this->tpl->assign('versionError', '');
 638
 639         } catch (Exception $exc) {
 640             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], $exc->getMessage());
 641             $this->tpl->assign('newVersion', '');
 642             $this->tpl->assign('versionError', escape($exc->getMessage()));
 643         }
 644
 645         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 646         $searchcrits = ''; // Search criteria
 647         if (!empty($_GET['searchtags'])) {
 648             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 649         }
 650         elseif (!empty($_GET['searchterm'])) {
 651             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 652         }
 653         $this->tpl->assign('searchcrits', $searchcrits);
 654         $this->tpl->assign('source', index_url($_SERVER));
 655         $this->tpl->assign('version', shaarli_version);
 656         $this->tpl->assign('scripturl', index_url($_SERVER));
 657         $this->tpl->assign('pagetitle', 'Shaarli');
 658         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 659         if (!empty($GLOBALS['title'])) {
 660             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 661         }
 662         if (!empty($GLOBALS['titleLink'])) {
 663             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 664         }
 665         if (!empty($GLOBALS['pagetitle'])) {
 666             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 667         }
 668         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 669         if (!empty($GLOBALS['plugin_errors'])) {
 670             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 671         }
 672     }
 673
 674     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 675     public function assign($what,$where)
 676     {
 677         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 678         $this->tpl->assign($what,$where);
 679     }
 680
 681     // Render a specific page (using a template).
 682     // e.g. pb.renderPage('picwall')
 683     public function renderPage($page)
 684     {
 685         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 686         $this->tpl->draw($page);
 687     }
 688
 689     /**
 690     * Render a 404 page (uses the template : tpl/404.tpl)
 691     *
 692     * usage : $PAGE->render404('The link was deleted')
 693     * @param string $message A messate to display what is not found
 694     */
 695     public function render404($message='The page you are trying to reach does not exist or has been deleted.') {
 696         header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
 697         $this->tpl->assign('error_message', $message);
 698         $this->renderPage('404');
 699     }
 700 }
 701
 702 // ------------------------------------------------------------------------------------------
 703 // Output the last N links in RSS 2.0 format.
 704 function showRSS()
 705 {
 706     header('Content-Type: application/rss+xml; charset=utf-8');
 707
 708     // $usepermalink : If true, use permalink instead of final link.
 709     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 710     // Also enabled through a config option
 711     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 712
 713     // Cache system
 714     $query = $_SERVER["QUERY_STRING"];
 715     $cache = new CachedPage(
 716         $GLOBALS['config']['PAGECACHE'],
 717         page_url($_SERVER),
 718         startsWith($query,'do=rss') && !isLoggedIn()
 719     );
 720     $cached = $cache->cachedVersion();
 721     if (! empty($cached)) {
 722         echo $cached;
 723         exit;
 724     }
 725
 726     // If cached was not found (or not usable), then read the database and build the response:
 727     $LINKSDB = new LinkDB(
 728         $GLOBALS['config']['DATASTORE'],
 729         isLoggedIn(),
 730         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 731         $GLOBALS['redirector']
 732     );
 733     // Read links from database (and filter private links if user it not logged in).
 734
 735     // Optionally filter the results:
 736     if (!empty($_GET['searchterm'])) {
 737         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 738     }
 739     elseif (!empty($_GET['searchtags'])) {
 740         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 741     }
 742     else {
 743         $linksToDisplay = $LINKSDB;
 744     }
 745
 746     $nblinksToDisplay = 50;  // Number of links to display.
 747     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 748     if (!empty($_GET['nb'])) {
 749         $nblinksToDisplay = $_GET['nb'] == 'all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 750     }
 751
 752     $pageaddr = escape(index_url($_SERVER));
 753     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 754     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 755     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 756     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 757     {
 758         echo '<!-- PubSubHubbub Discovery -->';
 759         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 760         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 761         echo '<!-- End Of PubSubHubbub Discovery -->';
 762     }
 763     $i=0;
 764     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 765     while ($i<$nblinksToDisplay && $i<count($keys))
 766     {
 767         $link = $linksToDisplay[$keys[$i]];
 768         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 769         $rfc822date = linkdate2rfc822($link['linkdate']);
 770         $absurl = $link['url'];
 771         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 772         if ($usepermalinks===true)
 773             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 774         else
 775             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 776         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 777         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 778         {
 779             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 780         }
 781
 782         // Add permalink in description
 783         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 784         // If user wants permalinks first, put the final link in description
 785         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 786         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 787         echo '<description><![CDATA['.
 788             format_description($link['description'], $GLOBALS['redirector']) .
 789             $descriptionlink . ']]></description>' . "\n</item>\n";
 790         $i++;
 791     }
 792     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 793
 794     $cache->cache(ob_get_contents());
 795     ob_end_flush();
 796     exit;
 797 }
 798
 799 // ------------------------------------------------------------------------------------------
 800 // Output the last N links in ATOM format.
 801 function showATOM()
 802 {
 803     header('Content-Type: application/atom+xml; charset=utf-8');
 804
 805     // $usepermalink : If true, use permalink instead of final link.
 806     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 807     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 808
 809     // Cache system
 810     $query = $_SERVER["QUERY_STRING"];
 811     $cache = new CachedPage(
 812         $GLOBALS['config']['PAGECACHE'],
 813         page_url($_SERVER),
 814         startsWith($query,'do=atom') && !isLoggedIn()
 815     );
 816     $cached = $cache->cachedVersion();
 817     if (!empty($cached)) {
 818         echo $cached;
 819         exit;
 820     }
 821
 822     // If cached was not found (or not usable), then read the database and build the response:
 823     // Read links from database (and filter private links if used it not logged in).
 824     $LINKSDB = new LinkDB(
 825         $GLOBALS['config']['DATASTORE'],
 826         isLoggedIn(),
 827         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 828         $GLOBALS['redirector']
 829     );
 830
 831     // Optionally filter the results:
 832     if (!empty($_GET['searchterm'])) {
 833         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 834     }
 835     else if (!empty($_GET['searchtags'])) {
 836         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 837     }
 838     else {
 839         $linksToDisplay = $LINKSDB;
 840     }
 841
 842     $nblinksToDisplay = 50;  // Number of links to display.
 843     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 844     if (!empty($_GET['nb'])) {
 845         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 846     }
 847
 848     $pageaddr=escape(index_url($_SERVER));
 849     $latestDate = '';
 850     $entries='';
 851     $i=0;
 852     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 853     while ($i<$nblinksToDisplay && $i<count($keys))
 854     {
 855         $link = $linksToDisplay[$keys[$i]];
 856         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 857         $iso8601date = linkdate2iso8601($link['linkdate']);
 858         $latestDate = max($latestDate,$iso8601date);
 859         $absurl = $link['url'];
 860         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 861         $entries.='<entry><title>'.$link['title'].'</title>';
 862         if ($usepermalinks===true)
 863             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 864         else
 865             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 866         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 867
 868         // Add permalink in description
 869         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 870         // If user wants permalinks first, put the final link in description
 871         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 872         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 873
 874         $entries .= '<content type="html"><![CDATA['.
 875             format_description($link['description'], $GLOBALS['redirector']) .
 876             $descriptionlink . "]]></content>\n";
 877         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 878         {
 879             foreach(explode(' ',$link['tags']) as $tag)
 880                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 881         }
 882         $entries.="</entry>\n";
 883         $i++;
 884     }
 885     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 886     $feed.='<title>'.$GLOBALS['title'].'</title>';
 887     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 888     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 889     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 890     {
 891         $feed.='<!-- PubSubHubbub Discovery -->';
 892         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 893         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 894     }
 895     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 896     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 897     $feed.=$entries;
 898     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 899     echo $feed;
 900
 901     $cache->cache(ob_get_contents());
 902     ob_end_flush();
 903     exit;
 904 }
 905
 906 // ------------------------------------------------------------------------------------------
 907 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 908 // Gives the last 7 days (which have links).
 909 // This RSS feed cannot be filtered.
 910 function showDailyRSS() {
 911     // Cache system
 912     $query = $_SERVER["QUERY_STRING"];
 913     $cache = new CachedPage(
 914         $GLOBALS['config']['PAGECACHE'],
 915         page_url($_SERVER),
 916         startsWith($query,'do=dailyrss') && !isLoggedIn()
 917     );
 918     $cached = $cache->cachedVersion();
 919     if (!empty($cached)) {
 920         echo $cached;
 921         exit;
 922     }
 923
 924     // If cached was not found (or not usable), then read the database and build the response:
 925     // Read links from database (and filter private links if used it not logged in).
 926     $LINKSDB = new LinkDB(
 927         $GLOBALS['config']['DATASTORE'],
 928         isLoggedIn(),
 929         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 930         $GLOBALS['redirector']
 931     );
 932
 933     /* Some Shaarlies may have very few links, so we need to look
 934        back in time (rsort()) until we have enough days ($nb_of_days).
 935     */
 936     $linkdates = array();
 937     foreach ($LINKSDB as $linkdate => $value) {
 938         $linkdates[] = $linkdate;
 939     }
 940     rsort($linkdates);
 941     $nb_of_days = 7; // We take 7 days.
 942     $today = Date('Ymd');
 943     $days = array();
 944
 945     foreach ($linkdates as $linkdate) {
 946         $day = substr($linkdate, 0, 8); // Extract day (without time)
 947         if (strcmp($day,$today) < 0) {
 948             if (empty($days[$day])) {
 949                 $days[$day] = array();
 950             }
 951             $days[$day][] = $linkdate;
 952         }
 953
 954         if (count($days) > $nb_of_days) {
 955             break; // Have we collected enough days?
 956         }
 957     }
 958
 959     // Build the RSS feed.
 960     header('Content-Type: application/rss+xml; charset=utf-8');
 961     $pageaddr = escape(index_url($_SERVER));
 962     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 963     echo '<channel>';
 964     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 965     echo '<link>'. $pageaddr .'</link>';
 966     echo '<description>Daily shared links</description>';
 967     echo '<language>en-en</language>';
 968     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 969
 970     // For each day.
 971     foreach ($days as $day => $linkdates) {
 972         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 973         $rfc822date = linkdate2rfc822($day.'_000000');
 974         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 975
 976         // Build the HTML body of this RSS entry.
 977         $html = '';
 978         $href = '';
 979         $links = array();
 980
 981         // We pre-format some fields for proper output.
 982         foreach ($linkdates as $linkdate) {
 983             $l = $LINKSDB[$linkdate];
 984             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 985             $l['thumbnail'] = thumbnail($l['url']);
 986             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 987             if (startsWith($l['url'], '?')) {
 988                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 989             }
 990             $links[$linkdate] = $l;
 991         }
 992
 993         // Then build the HTML for this day:
 994         $tpl = new RainTPL;
 995         $tpl->assign('title', $GLOBALS['title']);
 996         $tpl->assign('daydate', $daydate);
 997         $tpl->assign('absurl', $absurl);
 998         $tpl->assign('links', $links);
 999         $tpl->assign('rfc822date', escape($rfc822date));
1000         $html = $tpl->draw('dailyrss', $return_string=true);
1001
1002         echo $html . PHP_EOL;
1003     }
1004     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
1005
1006     $cache->cache(ob_get_contents());
1007     ob_end_flush();
1008     exit;
1009 }
1010
1011 /**
1012  * Show the 'Daily' page.
1013  *
1014  * @param PageBuilder $pageBuilder Template engine wrapper.
1015  */
1016 function showDaily($pageBuilder)
1017 {
1018     $LINKSDB = new LinkDB(
1019         $GLOBALS['config']['DATASTORE'],
1020         isLoggedIn(),
1021         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1022         $GLOBALS['redirector']
1023     );
1024
1025     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1026     if (isset($_GET['day'])) $day=$_GET['day'];
1027
1028     $days = $LINKSDB->days();
1029     $i = array_search($day,$days);
1030     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1031     $previousday='';
1032     $nextday='';
1033     if ($i!==false)
1034     {
1035         if ($i>=1) $previousday=$days[$i-1];
1036         if ($i<count($days)-1) $nextday=$days[$i+1];
1037     }
1038
1039     try {
1040         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_DAY, $day);
1041     } catch (Exception $exc) {
1042         error_log($exc);
1043         $linksToDisplay = array();
1044     }
1045
1046     // We pre-format some fields for proper output.
1047     foreach($linksToDisplay as $key=>$link)
1048     {
1049
1050         $taglist = explode(' ',$link['tags']);
1051         uasort($taglist, 'strcasecmp');
1052         $linksToDisplay[$key]['taglist']=$taglist;
1053         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
1054         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1055         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1056     }
1057
1058     /* We need to spread the articles on 3 columns.
1059        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1060        so I manually spread entries with a simple method: I roughly evaluate the
1061        height of a div according to title and description length.
1062     */
1063     $columns=array(array(),array(),array()); // Entries to display, for each column.
1064     $fill=array(0,0,0);  // Rough estimate of columns fill.
1065     foreach($linksToDisplay as $key=>$link)
1066     {
1067         // Roughly estimate length of entry (by counting characters)
1068         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1069         // Description: 836 characters gives roughly 342 pixel height.
1070         // This is not perfect, but it's usually OK.
1071         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1072         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1073         // Then put in column which is the less filled:
1074         $smallest=min($fill); // find smallest value in array.
1075         $index=array_search($smallest,$fill); // find index of this smallest value.
1076         array_push($columns[$index],$link); // Put entry in this column.
1077         $fill[$index]+=$length;
1078     }
1079
1080     $data = array(
1081         'linksToDisplay' => $linksToDisplay,
1082         'linkcount' => count($LINKSDB),
1083         'cols' => $columns,
1084         'day' => linkdate2timestamp($day.'_000000'),
1085         'previousday' => $previousday,
1086         'nextday' => $nextday,
1087     );
1088     $pluginManager = PluginManager::getInstance();
1089     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1090
1091     foreach ($data as $key => $value) {
1092         $pageBuilder->assign($key, $value);
1093     }
1094
1095     $pageBuilder->renderPage('daily');
1096     exit;
1097 }
1098
1099 // Renders the linklist
1100 function showLinkList($PAGE, $LINKSDB) {
1101     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1102     $PAGE->renderPage('linklist');
1103 }
1104
1105
1106 // ------------------------------------------------------------------------------------------
1107 // Render HTML page (according to URL parameters and user rights)
1108 function renderPage()
1109 {
1110     $LINKSDB = new LinkDB(
1111         $GLOBALS['config']['DATASTORE'],
1112         isLoggedIn(),
1113         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1114         $GLOBALS['redirector']
1115     );
1116
1117     $PAGE = new pageBuilder;
1118
1119     // Determine which page will be rendered.
1120     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1121     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1122
1123     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1124     // Then assign generated data to RainTPL.
1125     $common_hooks = array(
1126         'includes',
1127         'header',
1128         'footer',
1129     );
1130     $pluginManager = PluginManager::getInstance();
1131     foreach($common_hooks as $name) {
1132         $plugin_data = array();
1133         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1134             array(
1135                 'target' => $targetPage,
1136                 'loggedin' => isLoggedIn()
1137             )
1138         );
1139         $PAGE->assign('plugins_' . $name, $plugin_data);
1140     }
1141
1142     // -------- Display login form.
1143     if ($targetPage == Router::$PAGE_LOGIN)
1144     {
1145         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1146         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1147         $PAGE->assign('token',$token);
1148         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1149         $PAGE->renderPage('loginform');
1150         exit;
1151     }
1152     // -------- User wants to logout.
1153     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1154     {
1155         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1156         logout();
1157         header('Location: ?');
1158         exit;
1159     }
1160
1161     // -------- Picture wall
1162     if ($targetPage == Router::$PAGE_PICWALL)
1163     {
1164         // Optionally filter the results:
1165         if (!empty($_GET['searchterm'])) {
1166             $links = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
1167         }
1168         elseif (! empty($_GET['searchtags'])) {
1169             $links = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
1170         }
1171         else {
1172             $links = $LINKSDB;
1173         }
1174
1175         $linksToDisplay = array();
1176
1177         // Get only links which have a thumbnail.
1178         foreach($links as $link)
1179         {
1180             $permalink='?'.escape(smallhash($link['linkdate']));
1181             $thumb=lazyThumbnail($link['url'],$permalink);
1182             if ($thumb!='') // Only output links which have a thumbnail.
1183             {
1184                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1185                 $linksToDisplay[]=$link; // Add to array.
1186             }
1187         }
1188
1189         $data = array(
1190             'linkcount' => count($LINKSDB),
1191             'linksToDisplay' => $linksToDisplay,
1192         );
1193         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1194
1195         foreach ($data as $key => $value) {
1196             $PAGE->assign($key, $value);
1197         }
1198
1199         $PAGE->renderPage('picwall');
1200         exit;
1201     }
1202
1203     // -------- Tag cloud
1204     if ($targetPage == Router::$PAGE_TAGCLOUD)
1205     {
1206         $tags= $LINKSDB->allTags();
1207
1208         // We sort tags alphabetically, then choose a font size according to count.
1209         // First, find max value.
1210         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1211         ksort($tags);
1212         $tagList=array();
1213         foreach($tags as $key=>$value)
1214         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1215         {
1216             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1217         }
1218
1219         $data = array(
1220             'linkcount' => count($LINKSDB),
1221             'tags' => $tagList,
1222         );
1223         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1224
1225         foreach ($data as $key => $value) {
1226             $PAGE->assign($key, $value);
1227         }
1228
1229         $PAGE->renderPage('tagcloud');
1230         exit;
1231     }
1232
1233     // Daily page.
1234     if ($targetPage == Router::$PAGE_DAILY) {
1235         showDaily($PAGE);
1236     }
1237
1238     // Display openseach plugin (XML)
1239     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1240         header('Content-Type: application/xml; charset=utf-8');
1241         $PAGE->assign('serverurl', index_url($_SERVER));
1242         $PAGE->renderPage('opensearch');
1243         exit;
1244     }
1245
1246     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1247     if (isset($_GET['addtag']))
1248     {
1249         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1250         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1251         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1252
1253         // Prevent redirection loop
1254         if (isset($params['addtag'])) {
1255             unset($params['addtag']);
1256         }
1257
1258         // Check if this tag is already in the search query and ignore it if it is.
1259         // Each tag is always separated by a space
1260         if (isset($params['searchtags'])) {
1261             $current_tags = explode(' ', $params['searchtags']);
1262         } else {
1263             $current_tags = array();
1264         }
1265         $addtag = true;
1266         foreach ($current_tags as $value) {
1267             if ($value === $_GET['addtag']) {
1268                 $addtag = false;
1269                 break;
1270             }
1271         }
1272         // Append the tag if necessary
1273         if (empty($params['searchtags'])) {
1274             $params['searchtags'] = trim($_GET['addtag']);
1275         }
1276         else if ($addtag) {
1277             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1278         }
1279
1280         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1281         header('Location: ?'.http_build_query($params));
1282         exit;
1283     }
1284
1285     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1286     if (isset($_GET['removetag'])) {
1287         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1288         if (empty($_SERVER['HTTP_REFERER'])) {
1289             header('Location: ?');
1290             exit;
1291         }
1292
1293         // In case browser does not send HTTP_REFERER
1294         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1295
1296         // Prevent redirection loop
1297         if (isset($params['removetag'])) {
1298             unset($params['removetag']);
1299         }
1300
1301         if (isset($params['searchtags'])) {
1302             $tags = explode(' ', $params['searchtags']);
1303             // Remove value from array $tags.
1304             $tags = array_diff($tags, array($_GET['removetag']));
1305             $params['searchtags'] = implode(' ',$tags);
1306
1307             if (empty($params['searchtags'])) {
1308                 unset($params['searchtags']);
1309             }
1310
1311             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1312         }
1313         header('Location: ?'.http_build_query($params));
1314         exit;
1315     }
1316
1317     // -------- User wants to change the number of links per page (linksperpage=...)
1318     if (isset($_GET['linksperpage'])) {
1319         if (is_numeric($_GET['linksperpage'])) {
1320             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1321         }
1322
1323         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1324         exit;
1325     }
1326
1327     // -------- User wants to see only private links (toggle)
1328     if (isset($_GET['privateonly'])) {
1329         if (empty($_SESSION['privateonly'])) {
1330             $_SESSION['privateonly'] = 1; // See only private links
1331         } else {
1332             unset($_SESSION['privateonly']); // See all links
1333         }
1334
1335         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1336         exit;
1337     }
1338
1339     // -------- Handle other actions allowed for non-logged in users:
1340     if (!isLoggedIn())
1341     {
1342         // User tries to post new link but is not logged in:
1343         // Show login screen, then redirect to ?post=...
1344         if (isset($_GET['post']))
1345         {
1346             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1347             exit;
1348         }
1349
1350                 // Same case as above except that user tried to access ?do=addlink without being logged in
1351                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1352                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1353                         header('Location: ?do=login&post=');
1354                         exit;
1355                 }
1356         showLinkList($PAGE, $LINKSDB);
1357         if (isset($_GET['edit_link'])) {
1358             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1359             exit;
1360         }
1361
1362         exit; // Never remove this one! All operations below are reserved for logged in user.
1363     }
1364
1365     // -------- All other functions are reserved for the registered user:
1366
1367     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1368     if ($targetPage == Router::$PAGE_TOOLS)
1369     {
1370         $data = array(
1371             'linkcount' => count($LINKSDB),
1372             'pageabsaddr' => index_url($_SERVER),
1373         );
1374         $pluginManager->executeHooks('render_tools', $data);
1375
1376         foreach ($data as $key => $value) {
1377             $PAGE->assign($key, $value);
1378         }
1379
1380         $PAGE->renderPage('tools');
1381         exit;
1382     }
1383
1384     // -------- User wants to change his/her password.
1385     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1386     {
1387         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1388         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1389         {
1390             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1391
1392             // Make sure old password is correct.
1393             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1394             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1395             // Save new password
1396             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1397             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1398             try {
1399                 writeConfig($GLOBALS, isLoggedIn());
1400             }
1401             catch(Exception $e) {
1402                 error_log(
1403                     'ERROR while writing config file after changing password.' . PHP_EOL .
1404                     $e->getMessage()
1405                 );
1406
1407                 // TODO: do not handle exceptions/errors in JS.
1408                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1409                 exit;
1410             }
1411             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1412             exit;
1413         }
1414         else // show the change password form.
1415         {
1416             $PAGE->assign('linkcount',count($LINKSDB));
1417             $PAGE->assign('token',getToken());
1418             $PAGE->renderPage('changepassword');
1419             exit;
1420         }
1421     }
1422
1423     // -------- User wants to change configuration
1424     if ($targetPage == Router::$PAGE_CONFIGURE)
1425     {
1426         if (!empty($_POST['title']) )
1427         {
1428             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1429             $tz = 'UTC';
1430             if (!empty($_POST['continent']) && !empty($_POST['city']))
1431                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1432                     $tz = $_POST['continent'].'/'.$_POST['city'];
1433             $GLOBALS['timezone'] = $tz;
1434             $GLOBALS['title']=$_POST['title'];
1435             $GLOBALS['titleLink']=$_POST['titleLink'];
1436             $GLOBALS['redirector']=$_POST['redirector'];
1437             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1438             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1439             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1440             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1441             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1442             try {
1443                 writeConfig($GLOBALS, isLoggedIn());
1444             }
1445             catch(Exception $e) {
1446                 error_log(
1447                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1448                     $e->getMessage()
1449                 );
1450
1451                 // TODO: do not handle exceptions/errors in JS.
1452                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1453                 exit;
1454             }
1455             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1456             exit;
1457         }
1458         else // Show the configuration form.
1459         {
1460             $PAGE->assign('linkcount',count($LINKSDB));
1461             $PAGE->assign('token',getToken());
1462             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1463             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1464             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1465             $PAGE->assign('timezone_form', $timezone_form);
1466             $PAGE->assign('timezone_js',$timezone_js);
1467             $PAGE->renderPage('configure');
1468             exit;
1469         }
1470     }
1471
1472     // -------- User wants to rename a tag or delete it
1473     if ($targetPage == Router::$PAGE_CHANGETAG)
1474     {
1475         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1476             $PAGE->assign('linkcount', count($LINKSDB));
1477             $PAGE->assign('token', getToken());
1478             $PAGE->assign('tags', $LINKSDB->allTags());
1479             $PAGE->renderPage('changetag');
1480             exit;
1481         }
1482
1483         if (!tokenOk($_POST['token'])) {
1484             die('Wrong token.');
1485         }
1486
1487         // Delete a tag:
1488         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1489             $needle=trim($_POST['fromtag']);
1490             // True for case-sensitive tag search.
1491             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1492             foreach($linksToAlter as $key=>$value)
1493             {
1494                 $tags = explode(' ',trim($value['tags']));
1495                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1496                 $value['tags']=trim(implode(' ',$tags));
1497                 $LINKSDB[$key]=$value;
1498             }
1499             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1500             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1501             exit;
1502         }
1503
1504         // Rename a tag:
1505         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1506             $needle=trim($_POST['fromtag']);
1507             // True for case-sensitive tag search.
1508             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1509             foreach($linksToAlter as $key=>$value)
1510             {
1511                 $tags = explode(' ',trim($value['tags']));
1512                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1513                 $value['tags']=trim(implode(' ',$tags));
1514                 $LINKSDB[$key]=$value;
1515             }
1516             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1517             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1518             exit;
1519         }
1520     }
1521
1522     // -------- User wants to add a link without using the bookmarklet: Show form.
1523     if ($targetPage == Router::$PAGE_ADDLINK)
1524     {
1525         $PAGE->assign('linkcount',count($LINKSDB));
1526         $PAGE->renderPage('addlink');
1527         exit;
1528     }
1529
1530     // -------- User clicked the "Save" button when editing a link: Save link to database.
1531     if (isset($_POST['save_edit']))
1532     {
1533         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1534         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1535         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1536         $linkdate=$_POST['lf_linkdate'];
1537         $url = trim($_POST['lf_url']);
1538         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1539             $url = 'http://'.$url;
1540         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1541                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1542         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1543
1544         $pluginManager->executeHooks('save_link', $link);
1545
1546         $LINKSDB[$linkdate] = $link;
1547         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1548         pubsubhub();
1549
1550         // If we are called from the bookmarklet, we must close the popup:
1551         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1552             echo '<script>self.close();</script>';
1553             exit;
1554         }
1555
1556         $returnurl = !empty($_POST['returnurl']) ? escape($_POST['returnurl']): '?';
1557         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1558         $location .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1559         header('Location: '. $location); // After saving the link, redirect to the page the user was on.
1560         exit;
1561     }
1562
1563     // -------- User clicked the "Cancel" button when editing a link.
1564     if (isset($_POST['cancel_edit']))
1565     {
1566         // If we are called from the bookmarklet, we must close the popup:
1567         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1568         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1569         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1570         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1571         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1572         exit;
1573     }
1574
1575     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1576     if (isset($_POST['delete_link']))
1577     {
1578         if (!tokenOk($_POST['token'])) die('Wrong token.');
1579         // We do not need to ask for confirmation:
1580         // - confirmation is handled by JavaScript
1581         // - we are protected from XSRF by the token.
1582         $linkdate=$_POST['lf_linkdate'];
1583
1584         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1585
1586         unset($LINKSDB[$linkdate]);
1587         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1588
1589         // If we are called from the bookmarklet, we must close the popup:
1590         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1591         // Pick where we're going to redirect
1592         // =============================================================
1593         // Basically, we can't redirect to where we were previously if it was a permalink
1594         // or an edit_link, because it would 404.
1595         // Cases:
1596         //    - /             : nothing in $_GET, redirect to self
1597         //    - /?page        : redirect to self
1598         //    - /?searchterm  : redirect to self (there might be other links)
1599         //    - /?searchtags  : redirect to self
1600         //    - /permalink    : redirect to / (the link does not exist anymore)
1601         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1602         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1603         // redirect is not satisfied, and only then redirect to /
1604         $location = "?";
1605         // Self redirection
1606         if (count($_GET) == 0
1607             || isset($_GET['page'])
1608             || isset($_GET['searchterm'])
1609             || isset($_GET['searchtags'])
1610         ) {
1611             if (isset($_POST['returnurl'])) {
1612                 $location = $_POST['returnurl']; // Handle redirects given by the form
1613             } else {
1614                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1615             }
1616         }
1617
1618         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1619         exit;
1620     }
1621
1622     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1623     if (isset($_GET['edit_link']))
1624     {
1625         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1626         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1627         $data = array(
1628             'linkcount' => count($LINKSDB),
1629             'link' => $link,
1630             'link_is_new' => false,
1631             'token' => getToken(),
1632             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1633             'tags' => $LINKSDB->allTags(),
1634         );
1635         $pluginManager->executeHooks('render_editlink', $data);
1636
1637         foreach ($data as $key => $value) {
1638             $PAGE->assign($key, $value);
1639         }
1640
1641         $PAGE->renderPage('editlink');
1642         exit;
1643     }
1644
1645     // -------- User want to post a new link: Display link edit form.
1646     if (isset($_GET['post'])) {
1647         $url = cleanup_url(escape($_GET['post']));
1648
1649         $link_is_new = false;
1650         // Check if URL is not already in database (in this case, we will edit the existing link)
1651         $link = $LINKSDB->getLinkFromUrl($url);
1652         if (!$link)
1653         {
1654             $link_is_new = true;
1655             $linkdate = strval(date('Ymd_His'));
1656             // Get title if it was provided in URL (by the bookmarklet).
1657             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1658             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1659             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1660             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1661             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1662             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1663             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1664                 // Short timeout to keep the application responsive
1665                 list($headers, $content) = get_http_response($url, 4);
1666                 if (strpos($headers[0], '200 OK') !== false) {
1667                     // Retrieve charset.
1668                     $charset = get_charset($headers, $content);
1669                     // Extract title.
1670                     $title = html_extract_title($content);
1671                     // Re-encode title in utf-8 if necessary.
1672                     if (! empty($title) && $charset != 'utf-8') {
1673                         $title = mb_convert_encoding($title, $charset, 'utf-8');
1674                     }
1675                 }
1676             }
1677
1678             if ($url == '') {
1679                 $url = '?' . smallHash($linkdate);
1680                 $title = 'Note: ';
1681             }
1682
1683             $link = array(
1684                 'linkdate' => $linkdate,
1685                 'title' => $title,
1686                 'url' => $url,
1687                 'description' => $description,
1688                 'tags' => $tags,
1689                 'private' => $private
1690             );
1691         }
1692
1693         $data = array(
1694             'linkcount' => count($LINKSDB),
1695             'link' => $link,
1696             'link_is_new' => $link_is_new,
1697             'token' => getToken(), // XSRF protection.
1698             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1699             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1700             'tags' => $LINKSDB->allTags(),
1701         );
1702         $pluginManager->executeHooks('render_editlink', $data);
1703
1704         foreach ($data as $key => $value) {
1705             $PAGE->assign($key, $value);
1706         }
1707
1708         $PAGE->renderPage('editlink');
1709         exit;
1710     }
1711
1712     // -------- Export as Netscape Bookmarks HTML file.
1713     if ($targetPage == Router::$PAGE_EXPORT)
1714     {
1715         if (empty($_GET['what']))
1716         {
1717             $PAGE->assign('linkcount',count($LINKSDB));
1718             $PAGE->renderPage('export');
1719             exit;
1720         }
1721         $exportWhat=$_GET['what'];
1722         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1723
1724         header('Content-Type: text/html; charset=utf-8');
1725         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1726         $currentdate=date('Y/m/d H:i:s');
1727         echo <<<HTML
1728 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1729 <!-- This is an automatically generated file.
1730      It will be read and overwritten.
1731      DO NOT EDIT! -->
1732 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1733 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1734 <TITLE>Bookmarks</TITLE>
1735 <H1>Bookmarks</H1>
1736 HTML;
1737         foreach($LINKSDB as $link)
1738         {
1739             if ($exportWhat=='all' ||
1740                ($exportWhat=='private' && $link['private']!=0) ||
1741                ($exportWhat=='public' && $link['private']==0))
1742             {
1743                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1744                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1745                 echo '>'.$link['title']."</A>\n";
1746                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1747             }
1748         }
1749                 exit;
1750     }
1751
1752     // -------- User is uploading a file for import
1753     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1754     {
1755         // If file is too big, some form field may be missing.
1756         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1757         {
1758             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1759             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1760             exit;
1761         }
1762         if (!tokenOk($_POST['token'])) die('Wrong token.');
1763         importFile();
1764         exit;
1765     }
1766
1767     // -------- Show upload/import dialog:
1768     if ($targetPage == Router::$PAGE_IMPORT)
1769     {
1770         $PAGE->assign('linkcount',count($LINKSDB));
1771         $PAGE->assign('token',getToken());
1772         $PAGE->assign('maxfilesize',getMaxFileSize());
1773         $PAGE->renderPage('import');
1774         exit;
1775     }
1776
1777     // Plugin administration page
1778     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1779         $pluginMeta = $pluginManager->getPluginsMeta();
1780
1781         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1782         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1783         // Load parameters.
1784         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $GLOBALS['plugins']);
1785         uasort(
1786             $enabledPlugins,
1787             function($a, $b) { return $a['order'] - $b['order']; }
1788         );
1789         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1790
1791         $PAGE->assign('enabledPlugins', $enabledPlugins);
1792         $PAGE->assign('disabledPlugins', $disabledPlugins);
1793         $PAGE->renderPage('pluginsadmin');
1794         exit;
1795     }
1796
1797     // Plugin administration form action
1798     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1799         try {
1800             if (isset($_POST['parameters_form'])) {
1801                 unset($_POST['parameters_form']);
1802                 foreach ($_POST as $param => $value) {
1803                     $GLOBALS['plugins'][$param] = escape($value);
1804                 }
1805             }
1806             else {
1807                 $GLOBALS['config']['ENABLED_PLUGINS'] = save_plugin_config($_POST);
1808             }
1809             writeConfig($GLOBALS, isLoggedIn());
1810         }
1811         catch (Exception $e) {
1812             error_log(
1813                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1814                 $e->getMessage()
1815             );
1816
1817             // TODO: do not handle exceptions/errors in JS.
1818             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1819             exit;
1820         }
1821         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1822         exit;
1823     }
1824
1825     // -------- Otherwise, simply display search form and links:
1826     showLinkList($PAGE, $LINKSDB);
1827     exit;
1828 }
1829
1830 // -----------------------------------------------------------------------------------------------
1831 // Process the import file form.
1832 function importFile()
1833 {
1834     if (!isLoggedIn()) { die('Not allowed.'); }
1835     $LINKSDB = new LinkDB(
1836         $GLOBALS['config']['DATASTORE'],
1837         isLoggedIn(),
1838         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1839         $GLOBALS['redirector']
1840     );
1841     $filename=$_FILES['filetoupload']['name'];
1842     $filesize=$_FILES['filetoupload']['size'];
1843     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1844     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1845     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1846     $import_count=0;
1847
1848     // Sniff file type:
1849     $type='unknown';
1850     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1851
1852     // Then import the bookmarks.
1853     if ($type=='netscape')
1854     {
1855         // This is a standard Netscape-style bookmark file.
1856         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1857         foreach(explode('<DT>',$data) as $html) // explode is very fast
1858         {
1859             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1860             $d = explode('<DD>',$html);
1861             if (startswith($d[0],'<A '))
1862             {
1863                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1864                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1865                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1866                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1867                 $raw_add_date=0;
1868                 foreach($matches as $m)
1869                 {
1870                     $attr=$m[1]; $value=$m[2];
1871                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1872                     elseif ($attr=='ADD_DATE')
1873                     {
1874                         $raw_add_date=intval($value);
1875                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1876                     }
1877                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1878                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1879                 }
1880                 if ($link['url']!='')
1881                 {
1882                     if ($private==1) $link['private']=1;
1883                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1884                     if ($dblink==false)
1885                     {  // Link not in database, let's import it...
1886                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1887
1888                        // Make sure date/time is not already used by another link.
1889                        // (Some bookmark files have several different links with the same ADD_DATE)
1890                        // We increment date by 1 second until we find a date which is not used in DB.
1891                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1892                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1893                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1894                        $LINKSDB[$link['linkdate']] = $link;
1895                        $import_count++;
1896                     }
1897                     else // Link already present in database.
1898                     {
1899                         if ($overwrite)
1900                         {   // If overwrite is required, we import link data, except date/time.
1901                             $link['linkdate']=$dblink['linkdate'];
1902                             $LINKSDB[$link['linkdate']] = $link;
1903                             $import_count++;
1904                         }
1905                     }
1906
1907                 }
1908             }
1909         }
1910         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1911
1912         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1913     }
1914     else
1915     {
1916         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1917     }
1918 }
1919
1920 // -----------------------------------------------------------------------------------------------
1921 // Template for the list of links (<div id="linklist">)
1922 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1923 function buildLinkList($PAGE,$LINKSDB)
1924 {
1925     // ---- Filter link database according to parameters
1926     $search_type = '';
1927     $search_crits = '';
1928     $privateonly = !empty($_SESSION['privateonly']) ? true : false;
1929
1930     // Fulltext search
1931     if (isset($_GET['searchterm'])) {
1932         $search_crits = escape(trim($_GET['searchterm']));
1933         $search_type = LinkFilter::$FILTER_TEXT;
1934         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1935     }
1936     // Search by tag
1937     elseif (isset($_GET['searchtags'])) {
1938         $search_crits = explode(' ', escape(trim($_GET['searchtags'])));
1939         $search_type = LinkFilter::$FILTER_TAG;
1940         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1941     }
1942     // Detect smallHashes in URL.
1943     elseif (isset($_SERVER['QUERY_STRING'])
1944         && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/', $_SERVER['QUERY_STRING'])) {
1945         $search_type = LinkFilter::$FILTER_HASH;
1946         $search_crits = substr(trim($_SERVER["QUERY_STRING"], '/'), 0, 6);
1947         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits);
1948
1949         if (count($linksToDisplay) == 0) {
1950             $PAGE->render404('The link you are trying to reach does not exist or has been deleted.');
1951             exit;
1952         }
1953     }
1954     // Otherwise, display without filtering.
1955     else {
1956         $linksToDisplay = $LINKSDB->filter('', '', false, $privateonly);
1957     }
1958
1959     // ---- Handle paging.
1960     $keys = array();
1961     foreach ($linksToDisplay as $key => $value) {
1962         $keys[] = $key;
1963     }
1964
1965     // If there is only a single link, we change on-the-fly the title of the page.
1966     if (count($linksToDisplay) == 1) {
1967         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1968     }
1969
1970     // Select articles according to paging.
1971     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1972     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1973     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1974     $page = $page < 1 ? 1 : $page;
1975     $page = $page > $pagecount ? $pagecount : $page;
1976     // Start index.
1977     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1978     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1979     $linkDisp = array();
1980     while ($i<$end && $i<count($keys))
1981     {
1982         $link = $linksToDisplay[$keys[$i]];
1983         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1984         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1985         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1986         $link['timestamp'] = linkdate2timestamp($link['linkdate']);
1987         $taglist = explode(' ', $link['tags']);
1988         uasort($taglist, 'strcasecmp');
1989         $link['taglist'] = $taglist;
1990         $link['shorturl'] = smallHash($link['linkdate']);
1991         // Check for both signs of a note: starting with ? and 7 chars long.
1992         if ($link['url'][0] === '?' &&
1993             strlen($link['url']) === 7) {
1994             $link['url'] = index_url($_SERVER) . $link['url'];
1995         }
1996
1997         $linkDisp[$keys[$i]] = $link;
1998         $i++;
1999     }
2000
2001     // Compute paging navigation
2002     $searchterm = empty($_GET['searchterm']) ? '' : '&searchterm=' . $_GET['searchterm'];
2003     $searchtags = empty($_GET['searchtags']) ? '' : '&searchtags=' . $_GET['searchtags'];
2004     $previous_page_url = '';
2005     if ($i != count($keys)) {
2006         $previous_page_url = '?page=' . ($page+1) . $searchterm . $searchtags;
2007     }
2008     $next_page_url='';
2009     if ($page>1) {
2010         $next_page_url = '?page=' . ($page-1) . $searchterm . $searchtags;
2011     }
2012
2013     $token = '';
2014     if (isLoggedIn()) {
2015         $token = getToken();
2016     }
2017
2018     // Fill all template fields.
2019     $data = array(
2020         'linkcount' => count($LINKSDB),
2021         'previous_page_url' => $previous_page_url,
2022         'next_page_url' => $next_page_url,
2023         'page_current' => $page,
2024         'page_max' => $pagecount,
2025         'result_count' => count($linksToDisplay),
2026         'search_type' => $search_type,
2027         'search_crits' => $search_crits,
2028         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
2029         'token' => $token,
2030         'links' => $linkDisp,
2031         'tags' => $LINKSDB->allTags(),
2032     );
2033     // FIXME! temporary fix - see #399.
2034     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
2035         $data['pagetitle'] = $GLOBALS['pagetitle'];
2036     }
2037
2038     $pluginManager = PluginManager::getInstance();
2039     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
2040
2041     foreach ($data as $key => $value) {
2042         $PAGE->assign($key, $value);
2043     }
2044
2045     return;
2046 }
2047
2048 // Compute the thumbnail for a link.
2049 //
2050 // With a link to the original URL.
2051 // Understands various services (youtube.com...)
2052 // Input: $url = URL for which the thumbnail must be found.
2053 //        $href = if provided, this URL will be followed instead of $url
2054 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
2055 // Some of them may be missing.
2056 // Return an empty array if no thumbnail available.
2057 function computeThumbnail($url,$href=false)
2058 {
2059     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
2060     if ($href==false) $href=$url;
2061
2062     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
2063     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
2064     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
2065     $domain = parse_url($url,PHP_URL_HOST);
2066     if ($domain=='youtube.com' || $domain=='www.youtube.com')
2067     {
2068         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
2069         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
2070                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2071     }
2072     if ($domain=='youtu.be') // Youtube short links
2073     {
2074         $path = parse_url($url,PHP_URL_PATH);
2075         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
2076                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2077     }
2078     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
2079     {
2080         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2081         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2082                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2083     }
2084
2085     if ($domain=='imgur.com')
2086     {
2087         $path = parse_url($url,PHP_URL_PATH);
2088         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2089         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2090                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2091         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2092                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2093
2094         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2095                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2096     }
2097     if ($domain=='i.imgur.com')
2098     {
2099         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2100         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2101                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2102     }
2103     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2104     {
2105         if (strpos($url,'dailymotion.com/video/')!==false)
2106         {
2107             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2108             return array('src'=>$thumburl,
2109                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2110         }
2111     }
2112     if (endsWith($domain,'.imageshack.us'))
2113     {
2114         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2115         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2116         {
2117             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2118             return array('src'=>$thumburl,
2119                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2120         }
2121     }
2122
2123     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2124     // So we deport the thumbnail generation in order not to slow down page generation
2125     // (and we also cache the thumbnail)
2126
2127     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2128
2129     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2130         || $domain=='vimeo.com'
2131         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2132         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2133     )
2134     {
2135         if ($domain=='vimeo.com')
2136         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2137             $path = parse_url($url,PHP_URL_PATH);
2138             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2139         }
2140         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2141         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2142             $path = parse_url($url,PHP_URL_PATH);
2143             if (!preg_match('!/\d+.+?!',$path)) return array();
2144         }
2145         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2146         {   // Make sure this TED URL points to a video (/talks/...)
2147             $path = parse_url($url,PHP_URL_PATH);
2148             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2149         }
2150         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2151         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2152                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2153     }
2154
2155     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2156     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2157     // But using the extension will do.
2158     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2159     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2160     {
2161         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2162         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2163                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2164     }
2165     return array(); // No thumbnail.
2166
2167 }
2168
2169
2170 // Returns the HTML code to display a thumbnail for a link
2171 // with a link to the original URL.
2172 // Understands various services (youtube.com...)
2173 // Input: $url = URL for which the thumbnail must be found.
2174 //        $href = if provided, this URL will be followed instead of $url
2175 // Returns '' if no thumbnail available.
2176 function thumbnail($url,$href=false)
2177 {
2178     $t = computeThumbnail($url,$href);
2179     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2180
2181     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2182     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2183     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2184     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2185     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2186     $html.='></a>';
2187     return $html;
2188 }
2189
2190 // Returns the HTML code to display a thumbnail for a link
2191 // for the picture wall (using lazy image loading)
2192 // Understands various services (youtube.com...)
2193 // Input: $url = URL for which the thumbnail must be found.
2194 //        $href = if provided, this URL will be followed instead of $url
2195 // Returns '' if no thumbnail available.
2196 function lazyThumbnail($url,$href=false)
2197 {
2198     $t = computeThumbnail($url,$href);
2199     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2200
2201     $html='<a href="'.escape($t['href']).'">';
2202
2203     // Lazy image
2204     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2205
2206     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2207     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2208     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2209     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2210     $html.='>';
2211
2212     // No-JavaScript fallback.
2213     $html.='<noscript><img src="'.escape($t['src']).'"';
2214     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2215     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2216     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2217     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2218     $html.='></noscript></a>';
2219
2220     return $html;
2221 }
2222
2223
2224 // -----------------------------------------------------------------------------------------------
2225 // Installation
2226 // This function should NEVER be called if the file data/config.php exists.
2227 function install()
2228 {
2229     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2230     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2231
2232
2233     // This part makes sure sessions works correctly.
2234     // (Because on some hosts, session.save_path may not be set correctly,
2235     // or we may not have write access to it.)
2236     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2237     {   // Step 2: Check if data in session is correct.
2238         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2239         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2240         echo 'It currently points to '.session_save_path().'<br>';
2241         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2242         echo '<br><a href="?">Click to try again.</a></pre>';
2243         die;
2244     }
2245     if (!isset($_SESSION['session_tested']))
2246     {   // Step 1 : Try to store data in session and reload page.
2247         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2248         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2249     }
2250     if (isset($_GET['test_session']))
2251     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2252         header('Location: '.index_url($_SERVER));
2253     }
2254
2255
2256     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2257     {
2258         $tz = 'UTC';
2259         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2260             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2261                 $tz = $_POST['continent'].'/'.$_POST['city'];
2262             }
2263         }
2264         $GLOBALS['timezone'] = $tz;
2265         // Everything is ok, let's create config file.
2266         $GLOBALS['login'] = $_POST['setlogin'];
2267         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2268         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2269         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2270         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2271         try {
2272             writeConfig($GLOBALS, isLoggedIn());
2273         }
2274         catch(Exception $e) {
2275             error_log(
2276                     'ERROR while writing config file after installation.' . PHP_EOL .
2277                     $e->getMessage()
2278                 );
2279
2280             // TODO: do not handle exceptions/errors in JS.
2281             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2282             exit;
2283         }
2284         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2285         exit;
2286     }
2287
2288     // Display config form:
2289     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2290     $timezone_html = '';
2291     if ($timezone_form != '') {
2292         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2293     }
2294
2295     $PAGE = new pageBuilder;
2296     $PAGE->assign('timezone_html',$timezone_html);
2297     $PAGE->assign('timezone_js',$timezone_js);
2298     $PAGE->renderPage('install');
2299     exit;
2300 }
2301
2302 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2303    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2304    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2305    This function is called by passing the URL:
2306    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2307    [URL] is the URL of the link (e.g. a flickr page)
2308    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2309    The function below will fetch the image from the webservice and store it in the cache.
2310 */
2311 function genThumbnail()
2312 {
2313     // Make sure the parameters in the URL were generated by us.
2314     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2315     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2316
2317     // Let's see if we don't already have the image for this URL in the cache.
2318     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2319     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2320     {   // We have the thumbnail, just serve it:
2321         header('Content-Type: image/jpeg');
2322         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2323         return;
2324     }
2325     // We may also serve a blank image (if service did not respond)
2326     $blankname=hash('sha1',$_GET['url']).'.gif';
2327     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2328     {
2329         header('Content-Type: image/gif');
2330         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2331         return;
2332     }
2333
2334     // Otherwise, generate the thumbnail.
2335     $url = $_GET['url'];
2336     $domain = parse_url($url,PHP_URL_HOST);
2337
2338     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2339     {
2340         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2341         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2342
2343         // Is this a link to an image, or to a flickr page ?
2344         $imageurl='';
2345         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2346         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2347             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2348             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2349         }
2350         else // This is a flickr page (html)
2351         {
2352             // Get the flickr html page.
2353             list($headers, $content) = get_http_response($url, 20);
2354             if (strpos($headers[0], '200 OK') !== false)
2355             {
2356                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2357                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2358                 if (!empty($matches[1])) $imageurl=$matches[1];
2359
2360                 // In albums (and some other pages), the link rel="image_src" is not provided,
2361                 // but flickr provides:
2362                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2363                 if ($imageurl=='')
2364                 {
2365                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2366                     if (!empty($matches[1])) $imageurl=$matches[1];
2367                 }
2368             }
2369         }
2370
2371         if ($imageurl!='')
2372         {   // Let's download the image.
2373             // Image is 240x120, so 10 seconds to download should be enough.
2374             list($headers, $content) = get_http_response($imageurl, 10);
2375             if (strpos($headers[0], '200 OK') !== false) {
2376                 // Save image to cache.
2377                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/' . $thumbname, $content);
2378                 header('Content-Type: image/jpeg');
2379                 echo $content;
2380                 return;
2381             }
2382         }
2383     }
2384
2385     elseif ($domain=='vimeo.com' )
2386     {
2387         // This is more complex: we have to perform a HTTP request, then parse the result.
2388         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2389         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2390         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2391         if (strpos($headers[0], '200 OK') !== false) {
2392             $t = unserialize($content);
2393             $imageurl = $t[0]['thumbnail_medium'];
2394             // Then we download the image and serve it to our client.
2395             list($headers, $content) = get_http_response($imageurl, 10);
2396             if (strpos($headers[0], '200 OK') !== false) {
2397                 // Save image to cache.
2398                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2399                 header('Content-Type: image/jpeg');
2400                 echo $content;
2401                 return;
2402             }
2403         }
2404     }
2405
2406     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2407     {
2408         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2409         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2410         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2411         list($headers, $content) = get_http_response($url, 5);
2412         if (strpos($headers[0], '200 OK') !== false) {
2413             // Extract the link to the thumbnail
2414             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2415             if (!empty($matches[1]))
2416             {   // Let's download the image.
2417                 $imageurl=$matches[1];
2418                 // No control on image size, so wait long enough
2419                 list($headers, $content) = get_http_response($imageurl, 20);
2420                 if (strpos($headers[0], '200 OK') !== false) {
2421                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2422                     file_put_contents($filepath, $content); // Save image to cache.
2423                     if (resizeImage($filepath))
2424                     {
2425                         header('Content-Type: image/jpeg');
2426                         echo file_get_contents($filepath);
2427                         return;
2428                     }
2429                 }
2430             }
2431         }
2432     }
2433
2434     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2435     {
2436         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2437         // http://xkcd.com/327/
2438         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2439         list($headers, $content) = get_http_response($url, 5);
2440         if (strpos($headers[0], '200 OK') !== false) {
2441             // Extract the link to the thumbnail
2442             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2443             if (!empty($matches[1]))
2444             {   // Let's download the image.
2445                 $imageurl=$matches[1];
2446                 // No control on image size, so wait long enough
2447                 list($headers, $content) = get_http_response($imageurl, 20);
2448                 if (strpos($headers[0], '200 OK') !== false) {
2449                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2450                     // Save image to cache.
2451                     file_put_contents($filepath, $content);
2452                     if (resizeImage($filepath))
2453                     {
2454                         header('Content-Type: image/jpeg');
2455                         echo file_get_contents($filepath);
2456                         return;
2457                     }
2458                 }
2459             }
2460         }
2461     }
2462
2463     else
2464     {
2465         // For all other domains, we try to download the image and make a thumbnail.
2466         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2467         list($headers, $content) = get_http_response($url, 30);
2468         if (strpos($headers[0], '200 OK') !== false) {
2469             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2470             // Save image to cache.
2471             file_put_contents($filepath, $content);
2472             if (resizeImage($filepath))
2473             {
2474                 header('Content-Type: image/jpeg');
2475                 echo file_get_contents($filepath);
2476                 return;
2477             }
2478         }
2479     }
2480
2481
2482     // Otherwise, return an empty image (8x8 transparent gif)
2483     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2484     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2485     header('Content-Type: image/gif');
2486     echo $blankgif;
2487 }
2488
2489 // Make a thumbnail of the image (to width: 120 pixels)
2490 // Returns true if success, false otherwise.
2491 function resizeImage($filepath)
2492 {
2493     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2494
2495     // Trick: some stupid people rename GIF as JPEG... or else.
2496     // So we really try to open each image type whatever the extension is.
2497     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2498     $im=false;
2499     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2500     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2501     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2502     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2503     $w = imagesx($im);
2504     $h = imagesy($im);
2505     $ystart = 0; $yheight=$h;
2506     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2507     $nw = 120;   // Desired width
2508     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2509     // Resize image:
2510     $im2 = imagecreatetruecolor($nw,$nh);
2511     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2512     imageinterlace($im2,true); // For progressive JPEG.
2513     $tempname=$filepath.'_TEMP.jpg';
2514     imagejpeg($im2, $tempname, 90);
2515     imagedestroy($im);
2516     imagedestroy($im2);
2517     unlink($filepath);
2518     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2519     return true;
2520 }
2521
2522 try {
2523     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2524 } catch(Exception $e) {
2525     error_log(
2526         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2527         $e->getMessage()
2528     );
2529 }
2530
2531 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2532 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2533 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2534 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2535 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2536 renderPage();
2537 ?>