index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.0 - 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 // RainTPL cache directory (keep the trailing slash!)
  54 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  55 // Raintpl template directory (keep the trailing slash!)
  56 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  57
  58 // Thumbnail cache directory
  59 $GLOBALS['config']['CACHEDIR'] = 'cache';
  60
  61 // Atom & RSS feed cache directory
  62 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  63
  64
  65 /*
  66  * Global configuration
  67  */
  68 // Ban IP after this many failures
  69 $GLOBALS['config']['BAN_AFTER'] = 4;
  70 // Ban duration for IP address after login failures (in seconds)
  71 $GLOBALS['config']['BAN_DURATION'] = 1800;
  72
  73 // Feed options
  74 // Enable RSS permalinks by default.
  75 // This corresponds to the default behavior of shaarli before this was added as an option.
  76 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  77 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  78 $GLOBALS['config']['SHOW_ATOM'] = false;
  79
  80 // Link display options
  81 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  82 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  83 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  84
  85 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  86 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  87
  88 // Thumbnails
  89 // Display thumbnails in links
  90 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  91 // Store thumbnails in a local cache
  92 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  93
  94 // Update check frequency for Shaarli. 86400 seconds=24 hours
  95 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400 ;
  96
  97
  98 /*
  99  * Plugin configuration
 100  *
 101  * Warning: order matters!
 102  *
 103  * These settings may be be overriden in:
 104  *  - data/config.php
 105  *  - each plugin's configuration file
 106  */
 107 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 108 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 109 //    'wallabag', 'markdown', 'addlink_toolbar',
 110 //);
 111 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 112
 113 //$GLOBALS['plugins']['WALLABAG_URL'] = 'https://demo.wallabag.org/';
 114
 115 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 116 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 117
 118 /*
 119  * PHP configuration
 120  */
 121 define('shaarli_version', '0.6.0');
 122
 123 // http://server.com/x/shaarli --> /shaarli/
 124 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 125
 126 // High execution time in case of problematic imports/exports.
 127 ini_set('max_input_time','60');
 128
 129 // Try to set max upload file size and read
 130 ini_set('memory_limit', '128M');
 131 ini_set('post_max_size', '16M');
 132 ini_set('upload_max_filesize', '16M');
 133
 134 // See all error except warnings
 135 error_reporting(E_ALL^E_WARNING);
 136 // See all errors (for debugging only)
 137 //error_reporting(-1);
 138
 139 /*
 140  * User configuration
 141  */
 142 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 143     require_once $GLOBALS['config']['CONFIG_FILE'];
 144 }
 145
 146 // Shaarli library
 147 require_once 'application/ApplicationUtils.php';
 148 require_once 'application/Cache.php';
 149 require_once 'application/CachedPage.php';
 150 require_once 'application/FileUtils.php';
 151 require_once 'application/HttpUtils.php';
 152 require_once 'application/LinkDB.php';
 153 require_once 'application/TimeZone.php';
 154 require_once 'application/Url.php';
 155 require_once 'application/Utils.php';
 156 require_once 'application/Config.php';
 157 require_once 'application/PluginManager.php';
 158 require_once 'application/Router.php';
 159
 160 // Ensure the PHP version is supported
 161 try {
 162     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 163 } catch(Exception $exc) {
 164     header('Content-Type: text/plain; charset=utf-8');
 165     echo $exc->getMessage();
 166     exit;
 167 }
 168
 169 // Force cookie path (but do not change lifetime)
 170 $cookie = session_get_cookie_params();
 171 $cookiedir = '';
 172 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 173     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 174 }
 175 // Set default cookie expiration and path.
 176 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 177 // Set session parameters on server side.
 178 // If the user does not access any page within this time, his/her session is considered expired.
 179 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 180 // Use cookies to store session.
 181 ini_set('session.use_cookies', 1);
 182 // Force cookies for session (phpsessionID forbidden in URL).
 183 ini_set('session.use_only_cookies', 1);
 184 // Prevent PHP form using sessionID in URL if cookies are disabled.
 185 ini_set('session.use_trans_sid', false);
 186
 187 session_name('shaarli');
 188 // Start session if needed (Some server auto-start sessions).
 189 if (session_id() == '') {
 190     session_start();
 191 }
 192
 193 // Regenerate session ID if invalid or not defined in cookie.
 194 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 195     session_regenerate_id(true);
 196     $_COOKIE['shaarli'] = session_id();
 197 }
 198
 199 include "inc/rain.tpl.class.php"; //include Rain TPL
 200 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 201 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 202
 203 $pluginManager = PluginManager::getInstance();
 204 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 205
 206 ob_start();  // Output buffering for the page cache.
 207
 208
 209 // In case stupid admin has left magic_quotes enabled in php.ini:
 210 if (get_magic_quotes_gpc())
 211 {
 212     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 213     $_POST = array_map('stripslashes_deep', $_POST);
 214     $_GET = array_map('stripslashes_deep', $_GET);
 215     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 216 }
 217
 218 // Prevent caching on client side or proxy: (yes, it's ugly)
 219 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 220 header("Cache-Control: no-store, no-cache, must-revalidate");
 221 header("Cache-Control: post-check=0, pre-check=0", false);
 222 header("Pragma: no-cache");
 223
 224 // Handling of old config file which do not have the new parameters.
 225 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 226 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 227 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 228 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 229 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 230 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 231 // I really need to rewrite Shaarli with a proper configuation manager.
 232
 233 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 234     // Ensure Shaarli has proper access to its resources
 235     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 236
 237     if ($errors != array()) {
 238         $message = '<p>Insufficient permissions:</p><ul>';
 239
 240         foreach ($errors as $error) {
 241             $message .= '<li>'.$error.'</li>';
 242         }
 243         $message .= '</ul>';
 244
 245         header('Content-Type: text/html; charset=utf-8');
 246         echo $message;
 247         exit;
 248     }
 249
 250     // Display the installation form if no existing config is found
 251     install();
 252 }
 253
 254 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 255 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 256 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 257
 258 // a token depending of deployment salt, user password, and the current ip
 259 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 260
 261 autoLocale(); // Sniff browser language and set date format accordingly.
 262 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 263
 264 //==================================================================================================
 265 // Checking session state (i.e. is the user still logged in)
 266 //==================================================================================================
 267
 268 function setup_login_state() {
 269         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 270             return true;
 271         }
 272         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 273         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 274         if (!isset($GLOBALS['login'])) {
 275             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 276             $loginFailure = true;
 277         }
 278         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 279             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 280             !$loginFailure)
 281         {
 282             fillSessionInfo();
 283             $userIsLoggedIn = true;
 284         }
 285         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 286         if (empty($_SESSION['uid']) ||
 287             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 288             time() >= $_SESSION['expires_on'])
 289         {
 290             logout();
 291             $userIsLoggedIn = false;
 292             $loginFailure = true;
 293         }
 294         if (!empty($_SESSION['longlastingsession'])) {
 295             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 296         }
 297         else {
 298             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 299         }
 300         if (!$loginFailure) {
 301             $userIsLoggedIn = true;
 302         }
 303
 304         return $userIsLoggedIn;
 305 }
 306 $userIsLoggedIn = setup_login_state();
 307
 308
 309 // -----------------------------------------------------------------------------------------------
 310 // Log to text file
 311 function logm($message)
 312 {
 313     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 314     file_put_contents($GLOBALS['config']['LOG_FILE'], $t, FILE_APPEND);
 315 }
 316
 317 // ------------------------------------------------------------------------------------------
 318 // Sniff browser language to display dates in the right format automatically.
 319 // (Note that is may not work on your server if the corresponding local is not installed.)
 320 function autoLocale()
 321 {
 322     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 323     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 324     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 325         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 326             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 327             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 328                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 329                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 330                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 331         }
 332     }
 333     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 334 }
 335
 336 // ------------------------------------------------------------------------------------------
 337 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 338 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 339 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 340 function pubsubhub()
 341 {
 342     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 343     {
 344        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 345        $topic_url = array (
 346                        index_url($_SERVER).'?do=atom',
 347                        index_url($_SERVER).'?do=rss'
 348                     );
 349        $p->publish_update($topic_url);
 350     }
 351 }
 352
 353 // ------------------------------------------------------------------------------------------
 354 // Session management
 355
 356 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 357 function allIPs()
 358 {
 359     $ip = $_SERVER["REMOTE_ADDR"];
 360     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 361     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 362     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 363     return $ip;
 364 }
 365
 366 function fillSessionInfo() {
 367         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 368         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 369         $_SESSION['username']=$GLOBALS['login'];
 370         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 371 }
 372
 373 // Check that user/password is correct.
 374 function check_auth($login,$password)
 375 {
 376     $hash = sha1($password.$login.$GLOBALS['salt']);
 377     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 378     {   // Login/password is correct.
 379                 fillSessionInfo();
 380         logm('Login successful');
 381         return True;
 382     }
 383     logm('Login failed for user '.$login);
 384     return False;
 385 }
 386
 387 // Returns true if the user is logged in.
 388 function isLoggedIn()
 389 {
 390     global $userIsLoggedIn;
 391     return $userIsLoggedIn;
 392 }
 393
 394 // Force logout.
 395 function logout() {
 396     if (isset($_SESSION)) {
 397         unset($_SESSION['uid']);
 398         unset($_SESSION['ip']);
 399         unset($_SESSION['username']);
 400         unset($_SESSION['privateonly']);
 401     }
 402     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 403 }
 404
 405
 406 // ------------------------------------------------------------------------------------------
 407 // Brute force protection system
 408 // Several consecutive failed logins will ban the IP address for 30 minutes.
 409 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?>");
 410 include $GLOBALS['config']['IPBANS_FILENAME'];
 411 // Signal a failed login. Will ban the IP if too many failures:
 412 function ban_loginFailed()
 413 {
 414     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 415     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 416     $gb['FAILURES'][$ip]++;
 417     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 418     {
 419         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 420         logm('IP address banned from login');
 421     }
 422     $GLOBALS['IPBANS'] = $gb;
 423     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 424 }
 425
 426 // Signals a successful login. Resets failed login counter.
 427 function ban_loginOk()
 428 {
 429     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 430     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 431     $GLOBALS['IPBANS'] = $gb;
 432     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 433 }
 434
 435 // Checks if the user CAN login. If 'true', the user can try to login.
 436 function ban_canLogin()
 437 {
 438     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 439     if (isset($gb['BANS'][$ip]))
 440     {
 441         // User is banned. Check if the ban has expired:
 442         if ($gb['BANS'][$ip]<=time())
 443         {   // Ban expired, user can try to login again.
 444             logm('Ban lifted.');
 445             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 446             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 447             return true; // Ban has expired, user can login.
 448         }
 449         return false; // User is banned.
 450     }
 451     return true; // User is not banned.
 452 }
 453
 454 // ------------------------------------------------------------------------------------------
 455 // Process login form: Check if login/password is correct.
 456 if (isset($_POST['login']))
 457 {
 458     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 459     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 460     {   // Login/password is OK.
 461         ban_loginOk();
 462         // If user wants to keep the session cookie even after the browser closes:
 463         if (!empty($_POST['longlastingsession']))
 464         {
 465                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 466             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 467             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 468
 469             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 470             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 471             // Note: Never forget the trailing slash on the cookie path!
 472             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 473         }
 474         else // Standard session expiration (=when browser closes)
 475         {
 476             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 477             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 478             session_regenerate_id(true);
 479         }
 480
 481         // Optional redirect after login:
 482         if (isset($_GET['post'])) {
 483             $uri = '?post='. urlencode($_GET['post']);
 484             foreach (array('description', 'source', 'title') as $param) {
 485                 if (!empty($_GET[$param])) {
 486                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 487                 }
 488             }
 489             header('Location: '. $uri);
 490             exit;
 491         }
 492
 493         if (isset($_GET['edit_link'])) {
 494             header('Location: ?edit_link='. escape($_GET['edit_link']));
 495             exit;
 496         }
 497
 498         if (isset($_POST['returnurl'])) {
 499             // Prevent loops over login screen.
 500             if (strpos($_POST['returnurl'], 'do=login') === false) {
 501                 header('Location: '. escape($_POST['returnurl']));
 502                 exit;
 503             }
 504         }
 505         header('Location: ?'); exit;
 506     }
 507     else
 508     {
 509         ban_loginFailed();
 510         $redir = '';
 511         if (isset($_GET['post'])) {
 512             $redir = '?post=' . urlencode($_GET['post']);
 513             foreach (array('description', 'source', 'title') as $param) {
 514                 if (!empty($_GET[$param])) {
 515                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 516                 }
 517             }
 518         }
 519         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 520         exit;
 521     }
 522 }
 523
 524 // ------------------------------------------------------------------------------------------
 525 // Misc utility functions:
 526
 527 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 528 function return_bytes($val)
 529 {
 530     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 531     switch($last)
 532     {
 533         case 'g': $val *= 1024;
 534         case 'm': $val *= 1024;
 535         case 'k': $val *= 1024;
 536     }
 537     return $val;
 538 }
 539
 540 // Try to determine max file size for uploads (POST).
 541 // Returns an integer (in bytes)
 542 function getMaxFileSize()
 543 {
 544     $size1 = return_bytes(ini_get('post_max_size'));
 545     $size2 = return_bytes(ini_get('upload_max_filesize'));
 546     // Return the smaller of two:
 547     $maxsize = min($size1,$size2);
 548     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 549     return $maxsize;
 550 }
 551
 552 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 553     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 554     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 555 function linkdate2timestamp($linkdate)
 556 {
 557     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 558         $Y=$M=$D=$h=$m=$s=0;
 559         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 560         return mktime($h,$m,$s,$M,$D,$Y);
 561     }
 562     return time();
 563 }
 564
 565 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 566     (used to build the pubDate attribute in RSS feed.)  */
 567 function linkdate2rfc822($linkdate)
 568 {
 569     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 570 }
 571
 572 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 573     (used to build the updated tags in ATOM feed.)  */
 574 function linkdate2iso8601($linkdate)
 575 {
 576     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 577 }
 578
 579 // Extract title from an HTML document.
 580 // (Returns an empty string if not found.)
 581 function html_extract_title($html)
 582 {
 583   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 584 }
 585
 586 // ------------------------------------------------------------------------------------------
 587 // Token management for XSRF protection
 588 // Token should be used in any form which acts on data (create,update,delete,import...).
 589 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 590
 591 // Returns a token.
 592 function getToken()
 593 {
 594     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 595     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 596     return $rnd;
 597 }
 598
 599 // Tells if a token is OK. Using this function will destroy the token.
 600 // true=token is OK.
 601 function tokenOk($token)
 602 {
 603     if (isset($_SESSION['tokens'][$token]))
 604     {
 605         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 606         return true; // Token is OK.
 607     }
 608     return false; // Wrong token, or already used.
 609 }
 610
 611 // ------------------------------------------------------------------------------------------
 612 /* This class is in charge of building the final page.
 613    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 614    p = new pageBuilder;
 615    p.assign('myfield','myvalue');
 616    p.renderPage('mytemplate');
 617
 618 */
 619 class pageBuilder
 620 {
 621     private $tpl; // RainTPL template
 622
 623     function __construct()
 624     {
 625         $this->tpl = false;
 626     }
 627
 628     /**
 629      * Initialize all default tpl tags.
 630      */
 631     private function initialize()
 632     {
 633         $this->tpl = new RainTPL;
 634         $this->tpl->assign(
 635             'newversion',
 636             escape(
 637                 ApplicationUtils::checkUpdate(
 638                     shaarli_version,
 639                     $GLOBALS['config']['UPDATECHECK_FILENAME'],
 640                     $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 641                     $GLOBALS['config']['ENABLE_UPDATECHECK'],
 642                     isLoggedIn()
 643                 )
 644             )
 645         );
 646         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 647         $searchcrits = ''; // Search criteria
 648         if (!empty($_GET['searchtags'])) {
 649             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 650         }
 651         elseif (!empty($_GET['searchterm'])) {
 652             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 653         }
 654         $this->tpl->assign('searchcrits', $searchcrits);
 655         $this->tpl->assign('source', index_url($_SERVER));
 656         $this->tpl->assign('version', shaarli_version);
 657         $this->tpl->assign('scripturl', index_url($_SERVER));
 658         $this->tpl->assign('pagetitle', 'Shaarli');
 659         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 660         if (!empty($GLOBALS['title'])) {
 661             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 662         }
 663         if (!empty($GLOBALS['titleLink'])) {
 664             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 665         }
 666         if (!empty($GLOBALS['pagetitle'])) {
 667             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 668         }
 669         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 670         if (!empty($GLOBALS['plugin_errors'])) {
 671             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 672         }
 673     }
 674
 675     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 676     public function assign($what,$where)
 677     {
 678         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 679         $this->tpl->assign($what,$where);
 680     }
 681
 682     // Render a specific page (using a template).
 683     // e.g. pb.renderPage('picwall')
 684     public function renderPage($page)
 685     {
 686         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 687         $this->tpl->draw($page);
 688     }
 689 }
 690
 691 // ------------------------------------------------------------------------------------------
 692 // Output the last N links in RSS 2.0 format.
 693 function showRSS()
 694 {
 695     header('Content-Type: application/rss+xml; charset=utf-8');
 696
 697     // $usepermalink : If true, use permalink instead of final link.
 698     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 699     // Also enabled through a config option
 700     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 701
 702     // Cache system
 703     $query = $_SERVER["QUERY_STRING"];
 704     $cache = new CachedPage(
 705         $GLOBALS['config']['PAGECACHE'],
 706         page_url($_SERVER),
 707         startsWith($query,'do=rss') && !isLoggedIn()
 708     );
 709     $cached = $cache->cachedVersion();
 710     if (! empty($cached)) {
 711         echo $cached;
 712         exit;
 713     }
 714
 715     // If cached was not found (or not usable), then read the database and build the response:
 716     $LINKSDB = new LinkDB(
 717         $GLOBALS['config']['DATASTORE'],
 718         isLoggedIn(),
 719         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 720         $GLOBALS['redirector']
 721     );
 722     // Read links from database (and filter private links if user it not logged in).
 723
 724     // Optionally filter the results:
 725     $linksToDisplay=array();
 726     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 727     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 728     else $linksToDisplay = $LINKSDB;
 729
 730     $nblinksToDisplay = 50;  // Number of links to display.
 731     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 732     {
 733         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 734     }
 735
 736     $pageaddr=escape(index_url($_SERVER));
 737     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 738     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 739     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 740     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 741     {
 742         echo '<!-- PubSubHubbub Discovery -->';
 743         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 744         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 745         echo '<!-- End Of PubSubHubbub Discovery -->';
 746     }
 747     $i=0;
 748     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 749     while ($i<$nblinksToDisplay && $i<count($keys))
 750     {
 751         $link = $linksToDisplay[$keys[$i]];
 752         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 753         $rfc822date = linkdate2rfc822($link['linkdate']);
 754         $absurl = $link['url'];
 755         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 756         if ($usepermalinks===true)
 757             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 758         else
 759             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 760         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 761         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 762         {
 763             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 764         }
 765
 766         // Add permalink in description
 767         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 768         // If user wants permalinks first, put the final link in description
 769         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 770         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 771         echo '<description><![CDATA['.
 772             format_description($link['description'], $GLOBALS['redirector']) .
 773             $descriptionlink . ']]></description>' . "\n</item>\n";
 774         $i++;
 775     }
 776     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 777
 778     $cache->cache(ob_get_contents());
 779     ob_end_flush();
 780     exit;
 781 }
 782
 783 // ------------------------------------------------------------------------------------------
 784 // Output the last N links in ATOM format.
 785 function showATOM()
 786 {
 787     header('Content-Type: application/atom+xml; charset=utf-8');
 788
 789     // $usepermalink : If true, use permalink instead of final link.
 790     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 791     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 792
 793     // Cache system
 794     $query = $_SERVER["QUERY_STRING"];
 795     $cache = new CachedPage(
 796         $GLOBALS['config']['PAGECACHE'],
 797         page_url($_SERVER),
 798         startsWith($query,'do=atom') && !isLoggedIn()
 799     );
 800     $cached = $cache->cachedVersion();
 801     if (!empty($cached)) {
 802         echo $cached;
 803         exit;
 804     }
 805
 806     // If cached was not found (or not usable), then read the database and build the response:
 807     // Read links from database (and filter private links if used it not logged in).
 808     $LINKSDB = new LinkDB(
 809         $GLOBALS['config']['DATASTORE'],
 810         isLoggedIn(),
 811         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 812         $GLOBALS['redirector']
 813     );
 814
 815     // Optionally filter the results:
 816     $linksToDisplay=array();
 817     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 818     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 819     else $linksToDisplay = $LINKSDB;
 820
 821     $nblinksToDisplay = 50;  // Number of links to display.
 822     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 823     {
 824         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 825     }
 826
 827     $pageaddr=escape(index_url($_SERVER));
 828     $latestDate = '';
 829     $entries='';
 830     $i=0;
 831     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 832     while ($i<$nblinksToDisplay && $i<count($keys))
 833     {
 834         $link = $linksToDisplay[$keys[$i]];
 835         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 836         $iso8601date = linkdate2iso8601($link['linkdate']);
 837         $latestDate = max($latestDate,$iso8601date);
 838         $absurl = $link['url'];
 839         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 840         $entries.='<entry><title>'.$link['title'].'</title>';
 841         if ($usepermalinks===true)
 842             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 843         else
 844             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 845         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 846
 847         // Add permalink in description
 848         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 849         // If user wants permalinks first, put the final link in description
 850         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 851         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 852
 853         $entries .= '<content type="html"><![CDATA['.
 854             format_description($link['description'], $GLOBALS['redirector']) .
 855             $descriptionlink . "]]></content>\n";
 856         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 857         {
 858             foreach(explode(' ',$link['tags']) as $tag)
 859                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 860         }
 861         $entries.="</entry>\n";
 862         $i++;
 863     }
 864     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 865     $feed.='<title>'.$GLOBALS['title'].'</title>';
 866     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 867     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 868     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 869     {
 870         $feed.='<!-- PubSubHubbub Discovery -->';
 871         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 872         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 873     }
 874     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 875     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 876     $feed.=$entries;
 877     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 878     echo $feed;
 879
 880     $cache->cache(ob_get_contents());
 881     ob_end_flush();
 882     exit;
 883 }
 884
 885 // ------------------------------------------------------------------------------------------
 886 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 887 // Gives the last 7 days (which have links).
 888 // This RSS feed cannot be filtered.
 889 function showDailyRSS() {
 890     // Cache system
 891     $query = $_SERVER["QUERY_STRING"];
 892     $cache = new CachedPage(
 893         $GLOBALS['config']['PAGECACHE'],
 894         page_url($_SERVER),
 895         startsWith($query,'do=dailyrss') && !isLoggedIn()
 896     );
 897     $cached = $cache->cachedVersion();
 898     if (!empty($cached)) {
 899         echo $cached;
 900         exit;
 901     }
 902
 903     // If cached was not found (or not usable), then read the database and build the response:
 904     // Read links from database (and filter private links if used it not logged in).
 905     $LINKSDB = new LinkDB(
 906         $GLOBALS['config']['DATASTORE'],
 907         isLoggedIn(),
 908         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 909         $GLOBALS['redirector']
 910     );
 911
 912     /* Some Shaarlies may have very few links, so we need to look
 913        back in time (rsort()) until we have enough days ($nb_of_days).
 914     */
 915     $linkdates = array();
 916     foreach ($LINKSDB as $linkdate => $value) {
 917         $linkdates[] = $linkdate;
 918     }
 919     rsort($linkdates);
 920     $nb_of_days = 7; // We take 7 days.
 921     $today = Date('Ymd');
 922     $days = array();
 923
 924     foreach ($linkdates as $linkdate) {
 925         $day = substr($linkdate, 0, 8); // Extract day (without time)
 926         if (strcmp($day,$today) < 0) {
 927             if (empty($days[$day])) {
 928                 $days[$day] = array();
 929             }
 930             $days[$day][] = $linkdate;
 931         }
 932
 933         if (count($days) > $nb_of_days) {
 934             break; // Have we collected enough days?
 935         }
 936     }
 937
 938     // Build the RSS feed.
 939     header('Content-Type: application/rss+xml; charset=utf-8');
 940     $pageaddr = escape(index_url($_SERVER));
 941     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 942     echo '<channel>';
 943     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 944     echo '<link>'. $pageaddr .'</link>';
 945     echo '<description>Daily shared links</description>';
 946     echo '<language>en-en</language>';
 947     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 948
 949     // For each day.
 950     foreach ($days as $day => $linkdates) {
 951         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 952         $rfc822date = linkdate2rfc822($day.'_000000');
 953         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 954
 955         // Build the HTML body of this RSS entry.
 956         $html = '';
 957         $href = '';
 958         $links = array();
 959
 960         // We pre-format some fields for proper output.
 961         foreach ($linkdates as $linkdate) {
 962             $l = $LINKSDB[$linkdate];
 963             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 964             $l['thumbnail'] = thumbnail($l['url']);
 965             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 966             if (startsWith($l['url'], '?')) {
 967                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 968             }
 969             $links[$linkdate] = $l;
 970         }
 971
 972         // Then build the HTML for this day:
 973         $tpl = new RainTPL;
 974         $tpl->assign('title', $GLOBALS['title']);
 975         $tpl->assign('daydate', $daydate);
 976         $tpl->assign('absurl', $absurl);
 977         $tpl->assign('links', $links);
 978         $tpl->assign('rfc822date', escape($rfc822date));
 979         $html = $tpl->draw('dailyrss', $return_string=true);
 980
 981         echo $html . PHP_EOL;
 982     }
 983     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 984
 985     $cache->cache(ob_get_contents());
 986     ob_end_flush();
 987     exit;
 988 }
 989
 990 // "Daily" page.
 991 function showDaily()
 992 {
 993     $LINKSDB = new LinkDB(
 994         $GLOBALS['config']['DATASTORE'],
 995         isLoggedIn(),
 996         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 997         $GLOBALS['redirector']
 998     );
 999
1000     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1001     if (isset($_GET['day'])) $day=$_GET['day'];
1002
1003     $days = $LINKSDB->days();
1004     $i = array_search($day,$days);
1005     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1006     $previousday='';
1007     $nextday='';
1008     if ($i!==false)
1009     {
1010         if ($i>=1) $previousday=$days[$i-1];
1011         if ($i<count($days)-1) $nextday=$days[$i+1];
1012     }
1013
1014     try {
1015         $linksToDisplay = $LINKSDB->filterDay($day);
1016     } catch (Exception $exc) {
1017         error_log($exc);
1018         $linksToDisplay = array();
1019     }
1020
1021     // We pre-format some fields for proper output.
1022     foreach($linksToDisplay as $key=>$link)
1023     {
1024
1025         $taglist = explode(' ',$link['tags']);
1026         uasort($taglist, 'strcasecmp');
1027         $linksToDisplay[$key]['taglist']=$taglist;
1028         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
1029         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1030         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1031     }
1032
1033     /* We need to spread the articles on 3 columns.
1034        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1035        so I manually spread entries with a simple method: I roughly evaluate the
1036        height of a div according to title and description length.
1037     */
1038     $columns=array(array(),array(),array()); // Entries to display, for each column.
1039     $fill=array(0,0,0);  // Rough estimate of columns fill.
1040     foreach($linksToDisplay as $key=>$link)
1041     {
1042         // Roughly estimate length of entry (by counting characters)
1043         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1044         // Description: 836 characters gives roughly 342 pixel height.
1045         // This is not perfect, but it's usually OK.
1046         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1047         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1048         // Then put in column which is the less filled:
1049         $smallest=min($fill); // find smallest value in array.
1050         $index=array_search($smallest,$fill); // find index of this smallest value.
1051         array_push($columns[$index],$link); // Put entry in this column.
1052         $fill[$index]+=$length;
1053     }
1054     $PAGE = new pageBuilder;
1055     $data = array(
1056         'linksToDisplay' => $linksToDisplay,
1057         'linkcount' => count($LINKSDB),
1058         'cols' => $columns,
1059         'day' => linkdate2timestamp($day.'_000000'),
1060         'previousday' => $previousday,
1061         'nextday' => $nextday,
1062     );
1063     $pluginManager = PluginManager::getInstance();
1064     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1065
1066     foreach ($data as $key => $value) {
1067         $PAGE->assign($key, $value);
1068     }
1069
1070     $PAGE->renderPage('daily');
1071     exit;
1072 }
1073
1074 // Renders the linklist
1075 function showLinkList($PAGE, $LINKSDB) {
1076     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1077     $PAGE->renderPage('linklist');
1078 }
1079
1080
1081 // ------------------------------------------------------------------------------------------
1082 // Render HTML page (according to URL parameters and user rights)
1083 function renderPage()
1084 {
1085     $LINKSDB = new LinkDB(
1086         $GLOBALS['config']['DATASTORE'],
1087         isLoggedIn(),
1088         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1089         $GLOBALS['redirector']
1090     );
1091
1092     $PAGE = new pageBuilder;
1093
1094     // Determine which page will be rendered.
1095     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1096     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1097
1098     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1099     // Then assign generated data to RainTPL.
1100     $common_hooks = array(
1101         'header',
1102         'footer',
1103         'includes',
1104     );
1105     $pluginManager = PluginManager::getInstance();
1106     foreach($common_hooks as $name) {
1107         $plugin_data = array();
1108         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1109             array(
1110                 'target' => $targetPage,
1111                 'loggedin' => isLoggedIn()
1112             )
1113         );
1114         $PAGE->assign('plugins_' . $name, $plugin_data);
1115     }
1116
1117     // -------- Display login form.
1118     if ($targetPage == Router::$PAGE_LOGIN)
1119     {
1120         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1121         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1122         $PAGE->assign('token',$token);
1123         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1124         $PAGE->renderPage('loginform');
1125         exit;
1126     }
1127     // -------- User wants to logout.
1128     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1129     {
1130         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1131         logout();
1132         header('Location: ?');
1133         exit;
1134     }
1135
1136     // -------- Picture wall
1137     if ($targetPage == Router::$PAGE_PICWALL)
1138     {
1139         // Optionally filter the results:
1140         $links=array();
1141         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1142         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1143         else $links = $LINKSDB;
1144
1145         $body='';
1146         $linksToDisplay=array();
1147
1148         // Get only links which have a thumbnail.
1149         foreach($links as $link)
1150         {
1151             $permalink='?'.escape(smallhash($link['linkdate']));
1152             $thumb=lazyThumbnail($link['url'],$permalink);
1153             if ($thumb!='') // Only output links which have a thumbnail.
1154             {
1155                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1156                 $linksToDisplay[]=$link; // Add to array.
1157             }
1158         }
1159
1160         $data = array(
1161             'linkcount' => count($LINKSDB),
1162             'linksToDisplay' => $linksToDisplay,
1163         );
1164         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1165
1166         foreach ($data as $key => $value) {
1167             $PAGE->assign($key, $value);
1168         }
1169
1170         $PAGE->renderPage('picwall');
1171         exit;
1172     }
1173
1174     // -------- Tag cloud
1175     if ($targetPage == Router::$PAGE_TAGCLOUD)
1176     {
1177         $tags= $LINKSDB->allTags();
1178
1179         // We sort tags alphabetically, then choose a font size according to count.
1180         // First, find max value.
1181         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1182         ksort($tags);
1183         $tagList=array();
1184         foreach($tags as $key=>$value)
1185         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1186         {
1187             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1188         }
1189
1190         $data = array(
1191             'linkcount' => count($LINKSDB),
1192             'tags' => $tagList,
1193         );
1194         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1195
1196         foreach ($data as $key => $value) {
1197             $PAGE->assign($key, $value);
1198         }
1199
1200         $PAGE->renderPage('tagcloud');
1201         exit;
1202     }
1203
1204     // Display openseach plugin (XML)
1205     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1206         header('Content-Type: application/xml; charset=utf-8');
1207         $PAGE->assign('serverurl', index_url($_SERVER));
1208         $PAGE->renderPage('opensearch');
1209         exit;
1210     }
1211
1212     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1213     if (isset($_GET['addtag']))
1214     {
1215         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1216         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1217         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1218
1219         // Prevent redirection loop
1220         if (isset($params['addtag'])) {
1221             unset($params['addtag']);
1222         }
1223
1224         // Check if this tag is already in the search query and ignore it if it is.
1225         // Each tag is always separated by a space
1226         if (isset($params['searchtags'])) {
1227             $current_tags = explode(' ', $params['searchtags']);
1228         } else {
1229             $current_tags = array();
1230         }
1231         $addtag = true;
1232         foreach ($current_tags as $value) {
1233             if ($value === $_GET['addtag']) {
1234                 $addtag = false;
1235                 break;
1236             }
1237         }
1238         // Append the tag if necessary
1239         if (empty($params['searchtags'])) {
1240             $params['searchtags'] = trim($_GET['addtag']);
1241         }
1242         else if ($addtag) {
1243             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1244         }
1245
1246         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1247         header('Location: ?'.http_build_query($params));
1248         exit;
1249     }
1250
1251     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1252     if (isset($_GET['removetag'])) {
1253         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1254         if (empty($_SERVER['HTTP_REFERER'])) {
1255             header('Location: ?');
1256             exit;
1257         }
1258
1259         // In case browser does not send HTTP_REFERER
1260         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1261
1262         // Prevent redirection loop
1263         if (isset($params['removetag'])) {
1264             unset($params['removetag']);
1265         }
1266
1267         if (isset($params['searchtags'])) {
1268             $tags = explode(' ',$params['searchtags']);
1269             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1270             if (count($tags)==0) {
1271                 unset($params['searchtags']);
1272             } else {
1273                 $params['searchtags'] = implode(' ',$tags);
1274             }
1275             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1276         }
1277         header('Location: ?'.http_build_query($params));
1278         exit;
1279     }
1280
1281     // -------- User wants to change the number of links per page (linksperpage=...)
1282     if (isset($_GET['linksperpage'])) {
1283         if (is_numeric($_GET['linksperpage'])) {
1284             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1285         }
1286
1287         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1288         exit;
1289     }
1290
1291     // -------- User wants to see only private links (toggle)
1292     if (isset($_GET['privateonly'])) {
1293         if (empty($_SESSION['privateonly'])) {
1294             $_SESSION['privateonly'] = 1; // See only private links
1295         } else {
1296             unset($_SESSION['privateonly']); // See all links
1297         }
1298
1299         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1300         exit;
1301     }
1302
1303     // -------- Handle other actions allowed for non-logged in users:
1304     if (!isLoggedIn())
1305     {
1306         // User tries to post new link but is not logged in:
1307         // Show login screen, then redirect to ?post=...
1308         if (isset($_GET['post']))
1309         {
1310             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1311             exit;
1312         }
1313
1314                 // Same case as above except that user tried to access ?do=addlink without being logged in
1315                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1316                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1317                         header('Location: ?do=login&post=');
1318                         exit;
1319                 }
1320         showLinkList($PAGE, $LINKSDB);
1321         if (isset($_GET['edit_link'])) {
1322             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1323             exit;
1324         }
1325
1326         exit; // Never remove this one! All operations below are reserved for logged in user.
1327     }
1328
1329     // -------- All other functions are reserved for the registered user:
1330
1331     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1332     if ($targetPage == Router::$PAGE_TOOLS)
1333     {
1334         $data = array(
1335             'linkcount' => count($LINKSDB),
1336             'pageabsaddr' => index_url($_SERVER),
1337         );
1338         $pluginManager->executeHooks('render_tools', $data);
1339
1340         foreach ($data as $key => $value) {
1341             $PAGE->assign($key, $value);
1342         }
1343
1344         $PAGE->renderPage('tools');
1345         exit;
1346     }
1347
1348     // -------- User wants to change his/her password.
1349     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1350     {
1351         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1352         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1353         {
1354             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1355
1356             // Make sure old password is correct.
1357             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1358             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1359             // Save new password
1360             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1361             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1362             try {
1363                 writeConfig($GLOBALS, isLoggedIn());
1364             }
1365             catch(Exception $e) {
1366                 error_log(
1367                     'ERROR while writing config file after changing password.' . PHP_EOL .
1368                     $e->getMessage()
1369                 );
1370
1371                 // TODO: do not handle exceptions/errors in JS.
1372                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1373                 exit;
1374             }
1375             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1376             exit;
1377         }
1378         else // show the change password form.
1379         {
1380             $PAGE->assign('linkcount',count($LINKSDB));
1381             $PAGE->assign('token',getToken());
1382             $PAGE->renderPage('changepassword');
1383             exit;
1384         }
1385     }
1386
1387     // -------- User wants to change configuration
1388     if ($targetPage == Router::$PAGE_CONFIGURE)
1389     {
1390         if (!empty($_POST['title']) )
1391         {
1392             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1393             $tz = 'UTC';
1394             if (!empty($_POST['continent']) && !empty($_POST['city']))
1395                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1396                     $tz = $_POST['continent'].'/'.$_POST['city'];
1397             $GLOBALS['timezone'] = $tz;
1398             $GLOBALS['title']=$_POST['title'];
1399             $GLOBALS['titleLink']=$_POST['titleLink'];
1400             $GLOBALS['redirector']=$_POST['redirector'];
1401             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1402             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1403             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1404             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1405             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1406             try {
1407                 writeConfig($GLOBALS, isLoggedIn());
1408             }
1409             catch(Exception $e) {
1410                 error_log(
1411                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1412                     $e->getMessage()
1413                 );
1414
1415                 // TODO: do not handle exceptions/errors in JS.
1416                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1417                 exit;
1418             }
1419             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1420             exit;
1421         }
1422         else // Show the configuration form.
1423         {
1424             $PAGE->assign('linkcount',count($LINKSDB));
1425             $PAGE->assign('token',getToken());
1426             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1427             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1428             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1429             $PAGE->assign('timezone_form', $timezone_form);
1430             $PAGE->assign('timezone_js',$timezone_js);
1431             $PAGE->renderPage('configure');
1432             exit;
1433         }
1434     }
1435
1436     // -------- User wants to rename a tag or delete it
1437     if ($targetPage == Router::$PAGE_CHANGETAG)
1438     {
1439         if (empty($_POST['fromtag']))
1440         {
1441             $PAGE->assign('linkcount',count($LINKSDB));
1442             $PAGE->assign('token',getToken());
1443             $PAGE->assign('tags', $LINKSDB->allTags());
1444             $PAGE->renderPage('changetag');
1445             exit;
1446         }
1447         if (!tokenOk($_POST['token'])) die('Wrong token.');
1448
1449         // Delete a tag:
1450         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1451         {
1452             $needle=trim($_POST['fromtag']);
1453             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1454             foreach($linksToAlter as $key=>$value)
1455             {
1456                 $tags = explode(' ',trim($value['tags']));
1457                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1458                 $value['tags']=trim(implode(' ',$tags));
1459                 $LINKSDB[$key]=$value;
1460             }
1461             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1462             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1463             exit;
1464         }
1465
1466         // Rename a tag:
1467         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1468         {
1469             $needle=trim($_POST['fromtag']);
1470             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1471             foreach($linksToAlter as $key=>$value)
1472             {
1473                 $tags = explode(' ',trim($value['tags']));
1474                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1475                 $value['tags']=trim(implode(' ',$tags));
1476                 $LINKSDB[$key]=$value;
1477             }
1478             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1479             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1480             exit;
1481         }
1482     }
1483
1484     // -------- User wants to add a link without using the bookmarklet: Show form.
1485     if ($targetPage == Router::$PAGE_ADDLINK)
1486     {
1487         $PAGE->assign('linkcount',count($LINKSDB));
1488         $PAGE->renderPage('addlink');
1489         exit;
1490     }
1491
1492     // -------- User clicked the "Save" button when editing a link: Save link to database.
1493     if (isset($_POST['save_edit']))
1494     {
1495         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1496         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1497         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1498         $linkdate=$_POST['lf_linkdate'];
1499         $url = trim($_POST['lf_url']);
1500         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1501             $url = 'http://'.$url;
1502         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1503                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1504         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1505
1506         $pluginManager->executeHooks('save_link', $link);
1507
1508         $LINKSDB[$linkdate] = $link;
1509         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1510         pubsubhub();
1511
1512         // If we are called from the bookmarklet, we must close the popup:
1513         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1514             echo '<script>self.close();</script>';
1515             exit;
1516         }
1517
1518         $returnurl = !empty($_POST['returnurl']) ? escape($_POST['returnurl']): '?';
1519         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1520         $location .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1521         header('Location: '. $location); // After saving the link, redirect to the page the user was on.
1522         exit;
1523     }
1524
1525     // -------- User clicked the "Cancel" button when editing a link.
1526     if (isset($_POST['cancel_edit']))
1527     {
1528         // If we are called from the bookmarklet, we must close the popup:
1529         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1530         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1531         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1532         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1533         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1534         exit;
1535     }
1536
1537     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1538     if (isset($_POST['delete_link']))
1539     {
1540         if (!tokenOk($_POST['token'])) die('Wrong token.');
1541         // We do not need to ask for confirmation:
1542         // - confirmation is handled by JavaScript
1543         // - we are protected from XSRF by the token.
1544         $linkdate=$_POST['lf_linkdate'];
1545
1546         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1547
1548         unset($LINKSDB[$linkdate]);
1549         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1550
1551         // If we are called from the bookmarklet, we must close the popup:
1552         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1553         // Pick where we're going to redirect
1554         // =============================================================
1555         // Basically, we can't redirect to where we were previously if it was a permalink
1556         // or an edit_link, because it would 404.
1557         // Cases:
1558         //    - /             : nothing in $_GET, redirect to self
1559         //    - /?page        : redirect to self
1560         //    - /?searchterm  : redirect to self (there might be other links)
1561         //    - /?searchtags  : redirect to self
1562         //    - /permalink    : redirect to / (the link does not exist anymore)
1563         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1564         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1565         // redirect is not satisfied, and only then redirect to /
1566         $location = "?";
1567         // Self redirection
1568         if (count($_GET) == 0
1569             || isset($_GET['page'])
1570             || isset($_GET['searchterm'])
1571             || isset($_GET['searchtags'])
1572         ) {
1573             if (isset($_POST['returnurl'])) {
1574                 $location = $_POST['returnurl']; // Handle redirects given by the form
1575             } else {
1576                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1577             }
1578         }
1579
1580         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1581         exit;
1582     }
1583
1584     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1585     if (isset($_GET['edit_link']))
1586     {
1587         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1588         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1589         $data = array(
1590             'linkcount' => count($LINKSDB),
1591             'link' => $link,
1592             'link_is_new' => false,
1593             'token' => getToken(),
1594             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1595             'tags' => $LINKSDB->allTags(),
1596         );
1597         $pluginManager->executeHooks('render_editlink', $data);
1598
1599         foreach ($data as $key => $value) {
1600             $PAGE->assign($key, $value);
1601         }
1602
1603         $PAGE->renderPage('editlink');
1604         exit;
1605     }
1606
1607     // -------- User want to post a new link: Display link edit form.
1608     if (isset($_GET['post'])) {
1609         $url = cleanup_url($_GET['post']);
1610
1611         $link_is_new = false;
1612         // Check if URL is not already in database (in this case, we will edit the existing link)
1613         $link = $LINKSDB->getLinkFromUrl($url);
1614         if (!$link)
1615         {
1616             $link_is_new = true;
1617             $linkdate = strval(date('Ymd_His'));
1618             // Get title if it was provided in URL (by the bookmarklet).
1619             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1620             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1621             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1622             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1623             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1624             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1625             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1626                 // Short timeout to keep the application responsive
1627                 list($headers, $data) = get_http_url($url, 4);
1628                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1629                 if (strpos($headers[0], '200 OK') !== false) {
1630                     // Look for charset in html header.
1631                     preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1632
1633                     // If found, extract encoding.
1634                     if (!empty($meta[0])) {
1635                         // Get encoding specified in header.
1636                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1637                         // If charset not found, use utf-8.
1638                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1639                     }
1640                     else {
1641                         $html_charset = 'utf-8';
1642                     }
1643
1644                     // Extract title
1645                     $title = html_extract_title($data);
1646                     if (!empty($title)) {
1647                         // Re-encode title in utf-8 if necessary.
1648                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1649                     }
1650                 }
1651             }
1652             if ($url == '') {
1653                 $url = '?' . smallHash($linkdate);
1654                 $title = 'Note: ';
1655             }
1656             $link = array(
1657                 'linkdate' => $linkdate,
1658                 'title' => $title,
1659                 'url' => $url,
1660                 'description' => $description,
1661                 'tags' => $tags,
1662                 'private' => $private
1663             );
1664         }
1665
1666         $data = array(
1667             'linkcount' => count($LINKSDB),
1668             'link' => $link,
1669             'link_is_new' => $link_is_new,
1670             'token' => getToken(), // XSRF protection.
1671             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1672             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1673             'tags' => $LINKSDB->allTags(),
1674         );
1675         $pluginManager->executeHooks('render_editlink', $data);
1676
1677         foreach ($data as $key => $value) {
1678             $PAGE->assign($key, $value);
1679         }
1680
1681         $PAGE->renderPage('editlink');
1682         exit;
1683     }
1684
1685     // -------- Export as Netscape Bookmarks HTML file.
1686     if ($targetPage == Router::$PAGE_EXPORT)
1687     {
1688         if (empty($_GET['what']))
1689         {
1690             $PAGE->assign('linkcount',count($LINKSDB));
1691             $PAGE->renderPage('export');
1692             exit;
1693         }
1694         $exportWhat=$_GET['what'];
1695         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1696
1697         header('Content-Type: text/html; charset=utf-8');
1698         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1699         $currentdate=date('Y/m/d H:i:s');
1700         echo <<<HTML
1701 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1702 <!-- This is an automatically generated file.
1703      It will be read and overwritten.
1704      DO NOT EDIT! -->
1705 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1706 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1707 <TITLE>Bookmarks</TITLE>
1708 <H1>Bookmarks</H1>
1709 HTML;
1710         foreach($LINKSDB as $link)
1711         {
1712             if ($exportWhat=='all' ||
1713                ($exportWhat=='private' && $link['private']!=0) ||
1714                ($exportWhat=='public' && $link['private']==0))
1715             {
1716                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1717                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1718                 echo '>'.$link['title']."</A>\n";
1719                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1720             }
1721         }
1722                 exit;
1723     }
1724
1725     // -------- User is uploading a file for import
1726     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1727     {
1728         // If file is too big, some form field may be missing.
1729         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1730         {
1731             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1732             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1733             exit;
1734         }
1735         if (!tokenOk($_POST['token'])) die('Wrong token.');
1736         importFile();
1737         exit;
1738     }
1739
1740     // -------- Show upload/import dialog:
1741     if ($targetPage == Router::$PAGE_IMPORT)
1742     {
1743         $PAGE->assign('linkcount',count($LINKSDB));
1744         $PAGE->assign('token',getToken());
1745         $PAGE->assign('maxfilesize',getMaxFileSize());
1746         $PAGE->renderPage('import');
1747         exit;
1748     }
1749
1750     // -------- Otherwise, simply display search form and links:
1751     showLinkList($PAGE, $LINKSDB);
1752     exit;
1753 }
1754
1755 // -----------------------------------------------------------------------------------------------
1756 // Process the import file form.
1757 function importFile()
1758 {
1759     if (!isLoggedIn()) { die('Not allowed.'); }
1760     $LINKSDB = new LinkDB(
1761         $GLOBALS['config']['DATASTORE'],
1762         isLoggedIn(),
1763         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1764         $GLOBALS['redirector']
1765     );
1766     $filename=$_FILES['filetoupload']['name'];
1767     $filesize=$_FILES['filetoupload']['size'];
1768     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1769     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1770     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1771     $import_count=0;
1772
1773     // Sniff file type:
1774     $type='unknown';
1775     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1776
1777     // Then import the bookmarks.
1778     if ($type=='netscape')
1779     {
1780         // This is a standard Netscape-style bookmark file.
1781         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1782         foreach(explode('<DT>',$data) as $html) // explode is very fast
1783         {
1784             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1785             $d = explode('<DD>',$html);
1786             if (startswith($d[0],'<A '))
1787             {
1788                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1789                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1790                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1791                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1792                 $raw_add_date=0;
1793                 foreach($matches as $m)
1794                 {
1795                     $attr=$m[1]; $value=$m[2];
1796                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1797                     elseif ($attr=='ADD_DATE')
1798                     {
1799                         $raw_add_date=intval($value);
1800                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1801                     }
1802                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1803                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1804                 }
1805                 if ($link['url']!='')
1806                 {
1807                     if ($private==1) $link['private']=1;
1808                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1809                     if ($dblink==false)
1810                     {  // Link not in database, let's import it...
1811                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1812
1813                        // Make sure date/time is not already used by another link.
1814                        // (Some bookmark files have several different links with the same ADD_DATE)
1815                        // We increment date by 1 second until we find a date which is not used in DB.
1816                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1817                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1818                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1819                        $LINKSDB[$link['linkdate']] = $link;
1820                        $import_count++;
1821                     }
1822                     else // Link already present in database.
1823                     {
1824                         if ($overwrite)
1825                         {   // If overwrite is required, we import link data, except date/time.
1826                             $link['linkdate']=$dblink['linkdate'];
1827                             $LINKSDB[$link['linkdate']] = $link;
1828                             $import_count++;
1829                         }
1830                     }
1831
1832                 }
1833             }
1834         }
1835         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1836
1837         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1838     }
1839     else
1840     {
1841         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1842     }
1843 }
1844
1845 // -----------------------------------------------------------------------------------------------
1846 // Template for the list of links (<div id="linklist">)
1847 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1848 function buildLinkList($PAGE,$LINKSDB)
1849 {
1850     // ---- Filter link database according to parameters
1851     $linksToDisplay=array();
1852     $search_type='';
1853     $search_crits='';
1854     if (isset($_GET['searchterm'])) // Fulltext search
1855     {
1856         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1857         $search_crits=escape(trim($_GET['searchterm']));
1858         $search_type='fulltext';
1859     }
1860     elseif (isset($_GET['searchtags'])) // Search by tag
1861     {
1862         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1863         $search_crits=explode(' ',escape(trim($_GET['searchtags'])));
1864         $search_type='tags';
1865     }
1866     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1867     {
1868         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1869         if (count($linksToDisplay)==0)
1870         {
1871             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1872             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1873             echo '<br>Would you mind <a href="?">clicking here</a>?';
1874             exit;
1875         }
1876         $search_type='permalink';
1877     }
1878     else
1879         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1880
1881
1882     // Option: Show only private links
1883     if (!empty($_SESSION['privateonly']))
1884     {
1885         $tmp = array();
1886         foreach($linksToDisplay as $linkdate=>$link)
1887         {
1888             if ($link['private']!=0) $tmp[$linkdate]=$link;
1889         }
1890         $linksToDisplay=$tmp;
1891     }
1892
1893     // ---- Handle paging.
1894     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1895        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1896        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1897     */
1898     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1899
1900     // If there is only a single link, we change on-the-fly the title of the page.
1901     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1902
1903     // Select articles according to paging.
1904     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1905     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1906     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1907     $page = ( $page<1 ? 1 : $page );
1908     $page = ( $page>$pagecount ? $pagecount : $page );
1909     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1910     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1911     $linkDisp=array(); // Links to display
1912     while ($i<$end && $i<count($keys))
1913     {
1914         $link = $linksToDisplay[$keys[$i]];
1915         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1916         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1917         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1918         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1919         $taglist = explode(' ',$link['tags']);
1920         uasort($taglist, 'strcasecmp');
1921         $link['taglist']=$taglist;
1922         $link['shorturl'] = smallHash($link['linkdate']);
1923         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1924             strlen($link["url"]) === 7) {
1925             $link["url"] = index_url($_SERVER) . $link["url"];
1926         }
1927
1928         $linkDisp[$keys[$i]] = $link;
1929         $i++;
1930     }
1931
1932     // Compute paging navigation
1933     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1934     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1935     $paging='';
1936     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1937     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1938
1939     $token = ''; if (isLoggedIn()) $token=getToken();
1940
1941     // Fill all template fields.
1942     $data = array(
1943         'linkcount' => count($LINKSDB),
1944         'previous_page_url' => $previous_page_url,
1945         'next_page_url' => $next_page_url,
1946         'page_current' => $page,
1947         'page_max' => $pagecount,
1948         'result_count' => count($linksToDisplay),
1949         'search_type' => $search_type,
1950         'search_crits' => $search_crits,
1951         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
1952         'token' => $token,
1953         'links' => $linkDisp,
1954         'tags' => $LINKSDB->allTags(),
1955     );
1956
1957     $pluginManager = PluginManager::getInstance();
1958     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1959
1960     foreach ($data as $key => $value) {
1961         $PAGE->assign($key, $value);
1962     }
1963
1964     return;
1965 }
1966
1967 // Compute the thumbnail for a link.
1968 //
1969 // With a link to the original URL.
1970 // Understands various services (youtube.com...)
1971 // Input: $url = URL for which the thumbnail must be found.
1972 //        $href = if provided, this URL will be followed instead of $url
1973 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1974 // Some of them may be missing.
1975 // Return an empty array if no thumbnail available.
1976 function computeThumbnail($url,$href=false)
1977 {
1978     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1979     if ($href==false) $href=$url;
1980
1981     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1982     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1983     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1984     $domain = parse_url($url,PHP_URL_HOST);
1985     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1986     {
1987         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1988         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1989                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1990     }
1991     if ($domain=='youtu.be') // Youtube short links
1992     {
1993         $path = parse_url($url,PHP_URL_PATH);
1994         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1995                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1996     }
1997     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1998     {
1999         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2000         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2001                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2002     }
2003
2004     if ($domain=='imgur.com')
2005     {
2006         $path = parse_url($url,PHP_URL_PATH);
2007         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2008         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2009                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2010         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2011                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2012
2013         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2014                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2015     }
2016     if ($domain=='i.imgur.com')
2017     {
2018         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2019         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2020                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2021     }
2022     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2023     {
2024         if (strpos($url,'dailymotion.com/video/')!==false)
2025         {
2026             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2027             return array('src'=>$thumburl,
2028                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2029         }
2030     }
2031     if (endsWith($domain,'.imageshack.us'))
2032     {
2033         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2034         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2035         {
2036             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2037             return array('src'=>$thumburl,
2038                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2039         }
2040     }
2041
2042     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2043     // So we deport the thumbnail generation in order not to slow down page generation
2044     // (and we also cache the thumbnail)
2045
2046     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2047
2048     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2049         || $domain=='vimeo.com'
2050         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2051         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2052     )
2053     {
2054         if ($domain=='vimeo.com')
2055         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2056             $path = parse_url($url,PHP_URL_PATH);
2057             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2058         }
2059         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2060         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2061             $path = parse_url($url,PHP_URL_PATH);
2062             if (!preg_match('!/\d+.+?!',$path)) return array();
2063         }
2064         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2065         {   // Make sure this TED URL points to a video (/talks/...)
2066             $path = parse_url($url,PHP_URL_PATH);
2067             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2068         }
2069         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2070         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2071                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2072     }
2073
2074     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2075     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2076     // But using the extension will do.
2077     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2078     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2079     {
2080         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2081         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2082                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2083     }
2084     return array(); // No thumbnail.
2085
2086 }
2087
2088
2089 // Returns the HTML code to display a thumbnail for a link
2090 // with a link to the original URL.
2091 // Understands various services (youtube.com...)
2092 // Input: $url = URL for which the thumbnail must be found.
2093 //        $href = if provided, this URL will be followed instead of $url
2094 // Returns '' if no thumbnail available.
2095 function thumbnail($url,$href=false)
2096 {
2097     $t = computeThumbnail($url,$href);
2098     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2099
2100     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2101     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2102     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2103     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2104     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2105     $html.='></a>';
2106     return $html;
2107 }
2108
2109 // Returns the HTML code to display a thumbnail for a link
2110 // for the picture wall (using lazy image loading)
2111 // Understands various services (youtube.com...)
2112 // Input: $url = URL for which the thumbnail must be found.
2113 //        $href = if provided, this URL will be followed instead of $url
2114 // Returns '' if no thumbnail available.
2115 function lazyThumbnail($url,$href=false)
2116 {
2117     $t = computeThumbnail($url,$href);
2118     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2119
2120     $html='<a href="'.escape($t['href']).'">';
2121
2122     // Lazy image
2123     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2124
2125     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2126     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2127     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2128     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2129     $html.='>';
2130
2131     // No-JavaScript fallback.
2132     $html.='<noscript><img src="'.escape($t['src']).'"';
2133     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2134     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2135     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2136     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2137     $html.='></noscript></a>';
2138
2139     return $html;
2140 }
2141
2142
2143 // -----------------------------------------------------------------------------------------------
2144 // Installation
2145 // This function should NEVER be called if the file data/config.php exists.
2146 function install()
2147 {
2148     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2149     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2150
2151
2152     // This part makes sure sessions works correctly.
2153     // (Because on some hosts, session.save_path may not be set correctly,
2154     // or we may not have write access to it.)
2155     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2156     {   // Step 2: Check if data in session is correct.
2157         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2158         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2159         echo 'It currently points to '.session_save_path().'<br>';
2160         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2161         echo '<br><a href="?">Click to try again.</a></pre>';
2162         die;
2163     }
2164     if (!isset($_SESSION['session_tested']))
2165     {   // Step 1 : Try to store data in session and reload page.
2166         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2167         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2168     }
2169     if (isset($_GET['test_session']))
2170     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2171         header('Location: '.index_url($_SERVER));
2172     }
2173
2174
2175     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2176     {
2177         $tz = 'UTC';
2178         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2179             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2180                 $tz = $_POST['continent'].'/'.$_POST['city'];
2181             }
2182         }
2183         $GLOBALS['timezone'] = $tz;
2184         // Everything is ok, let's create config file.
2185         $GLOBALS['login'] = $_POST['setlogin'];
2186         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2187         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2188         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2189         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2190         try {
2191             writeConfig($GLOBALS, isLoggedIn());
2192         }
2193         catch(Exception $e) {
2194             error_log(
2195                     'ERROR while writing config file after installation.' . PHP_EOL .
2196                     $e->getMessage()
2197                 );
2198
2199             // TODO: do not handle exceptions/errors in JS.
2200             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2201             exit;
2202         }
2203         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2204         exit;
2205     }
2206
2207     // Display config form:
2208     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2209     $timezone_html = '';
2210     if ($timezone_form != '') {
2211         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2212     }
2213
2214     $PAGE = new pageBuilder;
2215     $PAGE->assign('timezone_html',$timezone_html);
2216     $PAGE->assign('timezone_js',$timezone_js);
2217     $PAGE->renderPage('install');
2218     exit;
2219 }
2220
2221 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2222    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2223    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2224    This function is called by passing the URL:
2225    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2226    [URL] is the URL of the link (e.g. a flickr page)
2227    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2228    The function below will fetch the image from the webservice and store it in the cache.
2229 */
2230 function genThumbnail()
2231 {
2232     // Make sure the parameters in the URL were generated by us.
2233     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2234     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2235
2236     // Let's see if we don't already have the image for this URL in the cache.
2237     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2238     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2239     {   // We have the thumbnail, just serve it:
2240         header('Content-Type: image/jpeg');
2241         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2242         return;
2243     }
2244     // We may also serve a blank image (if service did not respond)
2245     $blankname=hash('sha1',$_GET['url']).'.gif';
2246     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2247     {
2248         header('Content-Type: image/gif');
2249         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2250         return;
2251     }
2252
2253     // Otherwise, generate the thumbnail.
2254     $url = $_GET['url'];
2255     $domain = parse_url($url,PHP_URL_HOST);
2256
2257     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2258     {
2259         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2260         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2261
2262         // Is this a link to an image, or to a flickr page ?
2263         $imageurl='';
2264         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2265         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2266             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2267             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2268         }
2269         else // This is a flickr page (html)
2270         {
2271             // Get the flickr html page.
2272             list($headers, $data) = get_http_url($url, 20);
2273             if (strpos($headers[0], '200 OK') !== false)
2274             {
2275                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2276                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2277                 if (!empty($matches[1])) $imageurl=$matches[1];
2278
2279                 // In albums (and some other pages), the link rel="image_src" is not provided,
2280                 // but flickr provides:
2281                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2282                 if ($imageurl=='')
2283                 {
2284                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2285                     if (!empty($matches[1])) $imageurl=$matches[1];
2286                 }
2287             }
2288         }
2289
2290         if ($imageurl!='')
2291         {   // Let's download the image.
2292             // Image is 240x120, so 10 seconds to download should be enough.
2293             list($headers, $data) = get_http_url($imageurl, 10);
2294             if (strpos($headers[0], '200 OK') !== false) {
2295                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2296                 header('Content-Type: image/jpeg');
2297                 echo $data;
2298                 return;
2299             }
2300         }
2301     }
2302
2303     elseif ($domain=='vimeo.com' )
2304     {
2305         // This is more complex: we have to perform a HTTP request, then parse the result.
2306         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2307         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2308         list($headers, $data) = get_http_url('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2309         if (strpos($headers[0], '200 OK') !== false) {
2310             $t = unserialize($data);
2311             $imageurl = $t[0]['thumbnail_medium'];
2312             // Then we download the image and serve it to our client.
2313             list($headers, $data) = get_http_url($imageurl, 10);
2314             if (strpos($headers[0], '200 OK') !== false) {
2315                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2316                 header('Content-Type: image/jpeg');
2317                 echo $data;
2318                 return;
2319             }
2320         }
2321     }
2322
2323     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2324     {
2325         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2326         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2327         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2328         list($headers, $data) = get_http_url($url, 5);
2329         if (strpos($headers[0], '200 OK') !== false) {
2330             // Extract the link to the thumbnail
2331             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2332             if (!empty($matches[1]))
2333             {   // Let's download the image.
2334                 $imageurl=$matches[1];
2335                 // No control on image size, so wait long enough
2336                 list($headers, $data) = get_http_url($imageurl, 20);
2337                 if (strpos($headers[0], '200 OK') !== false) {
2338                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2339                     file_put_contents($filepath,$data); // Save image to cache.
2340                     if (resizeImage($filepath))
2341                     {
2342                         header('Content-Type: image/jpeg');
2343                         echo file_get_contents($filepath);
2344                         return;
2345                     }
2346                 }
2347             }
2348         }
2349     }
2350
2351     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2352     {
2353         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2354         // http://xkcd.com/327/
2355         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2356         list($headers, $data) = get_http_url($url, 5);
2357         if (strpos($headers[0], '200 OK') !== false) {
2358             // Extract the link to the thumbnail
2359             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2360             if (!empty($matches[1]))
2361             {   // Let's download the image.
2362                 $imageurl=$matches[1];
2363                 // No control on image size, so wait long enough
2364                 list($headers, $data) = get_http_url($imageurl, 20);
2365                 if (strpos($headers[0], '200 OK') !== false) {
2366                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2367                     file_put_contents($filepath,$data); // Save image to cache.
2368                     if (resizeImage($filepath))
2369                     {
2370                         header('Content-Type: image/jpeg');
2371                         echo file_get_contents($filepath);
2372                         return;
2373                     }
2374                 }
2375             }
2376         }
2377     }
2378
2379     else
2380     {
2381         // For all other domains, we try to download the image and make a thumbnail.
2382         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2383         list($headers, $data) = get_http_url($url, 30);
2384         if (strpos($headers[0], '200 OK') !== false) {
2385             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2386             file_put_contents($filepath,$data); // Save image to cache.
2387             if (resizeImage($filepath))
2388             {
2389                 header('Content-Type: image/jpeg');
2390                 echo file_get_contents($filepath);
2391                 return;
2392             }
2393         }
2394     }
2395
2396
2397     // Otherwise, return an empty image (8x8 transparent gif)
2398     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2399     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2400     header('Content-Type: image/gif');
2401     echo $blankgif;
2402 }
2403
2404 // Make a thumbnail of the image (to width: 120 pixels)
2405 // Returns true if success, false otherwise.
2406 function resizeImage($filepath)
2407 {
2408     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2409
2410     // Trick: some stupid people rename GIF as JPEG... or else.
2411     // So we really try to open each image type whatever the extension is.
2412     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2413     $im=false;
2414     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2415     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2416     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2417     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2418     $w = imagesx($im);
2419     $h = imagesy($im);
2420     $ystart = 0; $yheight=$h;
2421     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2422     $nw = 120;   // Desired width
2423     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2424     // Resize image:
2425     $im2 = imagecreatetruecolor($nw,$nh);
2426     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2427     imageinterlace($im2,true); // For progressive JPEG.
2428     $tempname=$filepath.'_TEMP.jpg';
2429     imagejpeg($im2, $tempname, 90);
2430     imagedestroy($im);
2431     imagedestroy($im2);
2432     unlink($filepath);
2433     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2434     return true;
2435 }
2436
2437 try {
2438     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2439 } catch(Exception $e) {
2440     error_log(
2441         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2442         $e->getMessage()
2443     );
2444 }
2445
2446 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2447 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2448 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2449 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2450 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2451 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2452 renderPage();
2453 ?>