index.php

   1 <?php
   2 // Shaarli 0.5.3 - Shaare your links...
   3 // The personal, minimalist, super-fast, no-database Delicious clone. By sebsauvage.net
   4 // http://sebsauvage.net/wiki/doku.php?id=php:shaarli
   5 // Licence: http://www.opensource.org/licenses/zlib-license.php
   6 // Requires: PHP 5.3.x
   7 // -----------------------------------------------------------------------------------------------
   8
   9 // Set 'UTC' as the default timezone if it is not defined in php.ini
  10 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  11 if (date_default_timezone_get() == '') {
  12     date_default_timezone_set('UTC');
  13 }
  14
  15 // -----------------------------------------------------------------------------------------------
  16 // Hardcoded parameter (These parameters can be overwritten by editing the file /data/config.php)
  17 // You should not touch any code below (or at your own risks!)
  18 $GLOBALS['config']['DATADIR'] = 'data'; // Data subdirectory
  19 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php'; // Configuration file (user login/password)
  20 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php'; // Data storage file.
  21 $GLOBALS['config']['LINKS_PER_PAGE'] = 20; // Default links per page.
  22 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php'; // File storage for failures and bans.
  23 $GLOBALS['config']['BAN_AFTER'] = 4;        // Ban IP after this many failures.
  24 $GLOBALS['config']['BAN_DURATION'] = 1800;  // Ban duration for IP address after login failures (in seconds) (1800 sec. = 30 minutes)
  25 $GLOBALS['config']['OPEN_SHAARLI'] = false; // If true, anyone can add/edit/delete links without having to login
  26 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false; // If true, the moment when links were saved are not shown to users that are not logged in.
  27 $GLOBALS['config']['SHOW_ATOM'] = false; // If true, an extra "ATOM feed" button will be displayed in the toolbar
  28 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true; // Enable thumbnails in links.
  29 $GLOBALS['config']['CACHEDIR'] = 'cache'; // Cache directory for thumbnails for SLOW services (like flickr)
  30 $GLOBALS['config']['PAGECACHE'] = 'pagecache'; // Page cache directory.
  31 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true; // Enable Shaarli to store thumbnail in a local cache. Disable to reduce web space usage.
  32 $GLOBALS['config']['PUBSUBHUB_URL'] = ''; // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
  33 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/' ; // Raintpl cache directory  (keep the trailing slash!)
  34 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/' ; // Raintpl template directory (keep the trailing slash!)
  35 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt'; // For updates check of Shaarli.
  36 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400 ; // Updates check frequency for Shaarli. 86400 seconds=24 hours
  37                                           // Note: You must have publisher.php in the same directory as Shaarli index.php
  38 $GLOBALS['config']['ARCHIVE_ORG'] = false; // For each link, add a link to an archived version on archive.org
  39 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;  // Enable RSS permalinks by default. This corresponds to the default behavior of shaarli before this was added as an option.
  40 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  41 // -----------------------------------------------------------------------------------------------
  42 define('shaarli_version','0.5.3');
  43 // http://server.com/x/shaarli --> /shaarli/
  44 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
  45
  46 // PHP Settings
  47 ini_set('max_input_time','60');  // High execution time in case of problematic imports/exports.
  48 ini_set('memory_limit', '128M');  // Try to set max upload file size and read (May not work on some hosts).
  49 ini_set('post_max_size', '16M');
  50 ini_set('upload_max_filesize', '16M');
  51 error_reporting(E_ALL^E_WARNING);  // See all error except warnings.
  52 //error_reporting(-1); // See all errors (for debugging only)
  53
  54 // User configuration
  55 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
  56     require_once $GLOBALS['config']['CONFIG_FILE'];
  57 }
  58
  59 // Shaarli library
  60 require_once 'application/Cache.php';
  61 require_once 'application/CachedPage.php';
  62 require_once 'application/HttpUtils.php';
  63 require_once 'application/LinkDB.php';
  64 require_once 'application/TimeZone.php';
  65 require_once 'application/Url.php';
  66 require_once 'application/Utils.php';
  67 require_once 'application/Config.php';
  68
  69 // Ensure the PHP version is supported
  70 try {
  71     checkPHPVersion('5.3', PHP_VERSION);
  72 } catch(Exception $e) {
  73     header('Content-Type: text/plain; charset=utf-8');
  74     echo $e->getMessage();
  75     exit;
  76 }
  77
  78 // Force cookie path (but do not change lifetime)
  79 $cookie = session_get_cookie_params();
  80 $cookiedir = '';
  81 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
  82     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
  83 }
  84 // Set default cookie expiration and path.
  85 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
  86 // Set session parameters on server side.
  87 // If the user does not access any page within this time, his/her session is considered expired.
  88 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
  89 // Use cookies to store session.
  90 ini_set('session.use_cookies', 1);
  91 // Force cookies for session (phpsessionID forbidden in URL).
  92 ini_set('session.use_only_cookies', 1);
  93 // Prevent PHP form using sessionID in URL if cookies are disabled.
  94 ini_set('session.use_trans_sid', false);
  95
  96 session_name('shaarli');
  97 // Start session if needed (Some server auto-start sessions).
  98 if (session_id() == '') {
  99     session_start();
 100 }
 101
 102 // Regenerate session ID if invalid or not defined in cookie.
 103 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 104     session_regenerate_id(true);
 105     $_COOKIE['shaarli'] = session_id();
 106 }
 107
 108 include "inc/rain.tpl.class.php"; //include Rain TPL
 109 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 110 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 111
 112 ob_start();  // Output buffering for the page cache.
 113
 114
 115 // In case stupid admin has left magic_quotes enabled in php.ini:
 116 if (get_magic_quotes_gpc())
 117 {
 118     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 119     $_POST = array_map('stripslashes_deep', $_POST);
 120     $_GET = array_map('stripslashes_deep', $_GET);
 121     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 122 }
 123
 124 // Prevent caching on client side or proxy: (yes, it's ugly)
 125 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 126 header("Cache-Control: no-store, no-cache, must-revalidate");
 127 header("Cache-Control: post-check=0, pre-check=0", false);
 128 header("Pragma: no-cache");
 129
 130 // Directories creations (Note that your web host may require different rights than 705.)
 131 if (!is_writable(realpath(dirname(__FILE__)))) die('<pre>ERROR: Shaarli does not have the right to write in its own directory.</pre>');
 132
 133 // Handling of old config file which do not have the new parameters.
 134 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(indexUrl());
 135 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 136 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 137 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 138 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 139 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 140 // I really need to rewrite Shaarli with a proper configuation manager.
 141
 142 // Run config screen if first run:
 143 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 144     install();
 145 }
 146
 147 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 148 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 149 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 150
 151 // a token depending of deployment salt, user password, and the current ip
 152 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 153
 154 autoLocale(); // Sniff browser language and set date format accordingly.
 155 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 156
 157 //==================================================================================================
 158 // Checking session state (i.e. is the user still logged in)
 159 //==================================================================================================
 160
 161 function setup_login_state() {
 162         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 163         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 164         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 165             $userIsLoggedIn = true;
 166         }
 167         if (!isset($GLOBALS['login'])) {
 168             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 169             $loginFailure = true;
 170         }
 171         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 172             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 173             !$loginFailure)
 174         {
 175             fillSessionInfo();
 176             $userIsLoggedIn = true;
 177         }
 178         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 179         if (empty($_SESSION['uid']) ||
 180             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 181             time() >= $_SESSION['expires_on'])
 182         {
 183             logout();
 184             $userIsLoggedIn = false;
 185             $loginFailure = true;
 186         }
 187         if (!empty($_SESSION['longlastingsession'])) {
 188             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 189         }
 190         else {
 191             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 192         }
 193         if (!$loginFailure) {
 194             $userIsLoggedIn = true;
 195         }
 196
 197         return $userIsLoggedIn;
 198 }
 199 $userIsLoggedIn = setup_login_state();
 200
 201 // Checks if an update is available for Shaarli.
 202 // (at most once a day, and only for registered user.)
 203 // Output: '' = no new version.
 204 //         other= the available version.
 205 function checkUpdate()
 206 {
 207     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
 208     if (empty($GLOBALS['config']['ENABLE_UPDATECHECK'])) return ''; // Do not check if the user doesn't want to.
 209
 210     // Get latest version number at most once a day.
 211     if (!is_file($GLOBALS['config']['UPDATECHECK_FILENAME']) || (filemtime($GLOBALS['config']['UPDATECHECK_FILENAME'])<time()-($GLOBALS['config']['UPDATECHECK_INTERVAL'])))
 212     {
 213         $version = shaarli_version;
 214         list($headers, $data) = get_http_url('https://raw.githubusercontent.com/shaarli/Shaarli/master/shaarli_version.php', 2);
 215         if (strpos($headers[0], '200 OK') !== false) {
 216             $version = str_replace(' */ ?>', '', str_replace('<?php /* ', '', $data));
 217         }
 218         // If failed, never mind. We don't want to bother the user with that.
 219         file_put_contents($GLOBALS['config']['UPDATECHECK_FILENAME'],$version); // touch file date
 220     }
 221     // Compare versions:
 222     $newestversion=file_get_contents($GLOBALS['config']['UPDATECHECK_FILENAME']);
 223     if (version_compare($newestversion,shaarli_version)==1) return $newestversion;
 224     return '';
 225 }
 226
 227
 228 // -----------------------------------------------------------------------------------------------
 229 // Log to text file
 230 function logm($message)
 231 {
 232     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 233     file_put_contents($GLOBALS['config']['DATADIR'].'/log.txt',$t,FILE_APPEND);
 234 }
 235
 236 // In a string, converts URLs to clickable links.
 237 // Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
 238 function text2clickable($url)
 239 {
 240     $redir = empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'];
 241     return preg_replace('!(((?:https?|ftp|file)://|apt:|magnet:)\S+[[:alnum:]]/?)!si','<a href="'.$redir.'$1" rel="nofollow">$1</a>',$url);
 242 }
 243
 244 // This function inserts &nbsp; where relevant so that multiple spaces are properly displayed in HTML
 245 // even in the absence of <pre>  (This is used in description to keep text formatting)
 246 function keepMultipleSpaces($text)
 247 {
 248     return str_replace('  ',' &nbsp;',$text);
 249
 250 }
 251 // ------------------------------------------------------------------------------------------
 252 // Sniff browser language to display dates in the right format automatically.
 253 // (Note that is may not work on your server if the corresponding local is not installed.)
 254 function autoLocale()
 255 {
 256     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 257     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 258     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 259         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 260             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 261             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 262                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 263                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 264                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 265         }
 266     }
 267     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 268 }
 269
 270 // ------------------------------------------------------------------------------------------
 271 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 272 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 273 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 274 function pubsubhub()
 275 {
 276     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 277     {
 278        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 279        $topic_url = array (
 280                        indexUrl().'?do=atom',
 281                        indexUrl().'?do=rss'
 282                     );
 283        $p->publish_update($topic_url);
 284     }
 285 }
 286
 287 // ------------------------------------------------------------------------------------------
 288 // Session management
 289
 290 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 291 function allIPs()
 292 {
 293     $ip = $_SERVER["REMOTE_ADDR"];
 294     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 295     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 296     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 297     return $ip;
 298 }
 299
 300 function fillSessionInfo() {
 301         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 302         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 303         $_SESSION['username']=$GLOBALS['login'];
 304         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 305 }
 306
 307 // Check that user/password is correct.
 308 function check_auth($login,$password)
 309 {
 310     $hash = sha1($password.$login.$GLOBALS['salt']);
 311     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 312     {   // Login/password is correct.
 313                 fillSessionInfo();
 314         logm('Login successful');
 315         return True;
 316     }
 317     logm('Login failed for user '.$login);
 318     return False;
 319 }
 320
 321 // Returns true if the user is logged in.
 322 function isLoggedIn()
 323 {
 324     global $userIsLoggedIn;
 325     return $userIsLoggedIn;
 326 }
 327
 328 // Force logout.
 329 function logout() {
 330     if (isset($_SESSION)) {
 331         unset($_SESSION['uid']);
 332         unset($_SESSION['ip']);
 333         unset($_SESSION['username']);
 334         unset($_SESSION['privateonly']);
 335     }
 336     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 337 }
 338
 339
 340 // ------------------------------------------------------------------------------------------
 341 // Brute force protection system
 342 // Several consecutive failed logins will ban the IP address for 30 minutes.
 343 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?>");
 344 include $GLOBALS['config']['IPBANS_FILENAME'];
 345 // Signal a failed login. Will ban the IP if too many failures:
 346 function ban_loginFailed()
 347 {
 348     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 349     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 350     $gb['FAILURES'][$ip]++;
 351     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 352     {
 353         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 354         logm('IP address banned from login');
 355     }
 356     $GLOBALS['IPBANS'] = $gb;
 357     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 358 }
 359
 360 // Signals a successful login. Resets failed login counter.
 361 function ban_loginOk()
 362 {
 363     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 364     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 365     $GLOBALS['IPBANS'] = $gb;
 366     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 367 }
 368
 369 // Checks if the user CAN login. If 'true', the user can try to login.
 370 function ban_canLogin()
 371 {
 372     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 373     if (isset($gb['BANS'][$ip]))
 374     {
 375         // User is banned. Check if the ban has expired:
 376         if ($gb['BANS'][$ip]<=time())
 377         {   // Ban expired, user can try to login again.
 378             logm('Ban lifted.');
 379             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 380             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 381             return true; // Ban has expired, user can login.
 382         }
 383         return false; // User is banned.
 384     }
 385     return true; // User is not banned.
 386 }
 387
 388 // ------------------------------------------------------------------------------------------
 389 // Process login form: Check if login/password is correct.
 390 if (isset($_POST['login']))
 391 {
 392     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 393     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 394     {   // Login/password is OK.
 395         ban_loginOk();
 396         // If user wants to keep the session cookie even after the browser closes:
 397         if (!empty($_POST['longlastingsession']))
 398         {
 399                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 400             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 401             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 402
 403             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 404             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 405             // Note: Never forget the trailing slash on the cookie path!
 406             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 407         }
 408         else // Standard session expiration (=when browser closes)
 409         {
 410             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 411             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 412             session_regenerate_id(true);
 413         }
 414
 415         // Optional redirect after login:
 416         if (isset($_GET['post'])) {
 417             $uri = '?post='. urlencode($_GET['post']);
 418             foreach (array('description', 'source', 'title') as $param) {
 419                 if (!empty($_GET[$param])) {
 420                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 421                 }
 422             }
 423             header('Location: '. $uri);
 424             exit;
 425         }
 426
 427         if (isset($_GET['edit_link'])) {
 428             header('Location: ?edit_link='. escape($_GET['edit_link']));
 429             exit;
 430         }
 431
 432         if (isset($_POST['returnurl'])) {
 433             // Prevent loops over login screen.
 434             if (strpos($_POST['returnurl'], 'do=login') === false) {
 435                 header('Location: '. escape($_POST['returnurl']));
 436                 exit;
 437             }
 438         }
 439         header('Location: ?'); exit;
 440     }
 441     else
 442     {
 443         ban_loginFailed();
 444         $redir = '';
 445         if (isset($_GET['post'])) {
 446             $redir = '?post=' . urlencode($_GET['post']);
 447             foreach (array('description', 'source', 'title') as $param) {
 448                 if (!empty($_GET[$param])) {
 449                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 450                 }
 451             }
 452         }
 453         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 454         exit;
 455     }
 456 }
 457
 458 // ------------------------------------------------------------------------------------------
 459 // Misc utility functions:
 460
 461 // Returns the server URL (including port and http/https), without path.
 462 // e.g. "http://myserver.com:8080"
 463 // You can append $_SERVER['SCRIPT_NAME'] to get the current script URL.
 464 function serverUrl()
 465 {
 466     $https = (!empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS'])=='on')) || $_SERVER["SERVER_PORT"]=='443'; // HTTPS detection.
 467     $serverport = ($_SERVER["SERVER_PORT"]=='80' || ($https && $_SERVER["SERVER_PORT"]=='443') ? '' : ':'.$_SERVER["SERVER_PORT"]);
 468     return 'http'.($https?'s':'').'://'.$_SERVER['SERVER_NAME'].$serverport;
 469 }
 470
 471 // Returns the absolute URL of current script, without the query.
 472 // (e.g. http://sebsauvage.net/links/)
 473 function indexUrl()
 474 {
 475     $scriptname = $_SERVER["SCRIPT_NAME"];
 476     // If the script is named 'index.php', we remove it (for better looking URLs,
 477     // e.g. http://mysite.com/shaarli/?abcde instead of http://mysite.com/shaarli/index.php?abcde)
 478     if (endswith($scriptname,'index.php')) $scriptname = substr($scriptname,0,strlen($scriptname)-9);
 479     return serverUrl() . $scriptname;
 480 }
 481
 482 // Returns the absolute URL of current script, WITH the query.
 483 // (e.g. http://sebsauvage.net/links/?toto=titi&spamspamspam=humbug)
 484 function pageUrl()
 485 {
 486     return indexUrl().(!empty($_SERVER["QUERY_STRING"]) ? '?'.$_SERVER["QUERY_STRING"] : '');
 487 }
 488
 489 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 490 function return_bytes($val)
 491 {
 492     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 493     switch($last)
 494     {
 495         case 'g': $val *= 1024;
 496         case 'm': $val *= 1024;
 497         case 'k': $val *= 1024;
 498     }
 499     return $val;
 500 }
 501
 502 // Try to determine max file size for uploads (POST).
 503 // Returns an integer (in bytes)
 504 function getMaxFileSize()
 505 {
 506     $size1 = return_bytes(ini_get('post_max_size'));
 507     $size2 = return_bytes(ini_get('upload_max_filesize'));
 508     // Return the smaller of two:
 509     $maxsize = min($size1,$size2);
 510     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 511     return $maxsize;
 512 }
 513
 514 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 515     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 516     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 517 function linkdate2timestamp($linkdate)
 518 {
 519     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 520         $Y=$M=$D=$h=$m=$s=0;
 521         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 522         return mktime($h,$m,$s,$M,$D,$Y);
 523     }
 524     return time();
 525 }
 526
 527 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 528     (used to build the pubDate attribute in RSS feed.)  */
 529 function linkdate2rfc822($linkdate)
 530 {
 531     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 532 }
 533
 534 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 535     (used to build the updated tags in ATOM feed.)  */
 536 function linkdate2iso8601($linkdate)
 537 {
 538     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 539 }
 540
 541 // Extract title from an HTML document.
 542 // (Returns an empty string if not found.)
 543 function html_extract_title($html)
 544 {
 545   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 546 }
 547
 548 // ------------------------------------------------------------------------------------------
 549 // Token management for XSRF protection
 550 // Token should be used in any form which acts on data (create,update,delete,import...).
 551 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 552
 553 // Returns a token.
 554 function getToken()
 555 {
 556     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 557     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 558     return $rnd;
 559 }
 560
 561 // Tells if a token is OK. Using this function will destroy the token.
 562 // true=token is OK.
 563 function tokenOk($token)
 564 {
 565     if (isset($_SESSION['tokens'][$token]))
 566     {
 567         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 568         return true; // Token is OK.
 569     }
 570     return false; // Wrong token, or already used.
 571 }
 572
 573 // ------------------------------------------------------------------------------------------
 574 /* This class is in charge of building the final page.
 575    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 576    p = new pageBuilder;
 577    p.assign('myfield','myvalue');
 578    p.renderPage('mytemplate');
 579
 580 */
 581 class pageBuilder
 582 {
 583     private $tpl; // RainTPL template
 584
 585     function __construct()
 586     {
 587         $this->tpl=false;
 588     }
 589
 590     private function initialize()
 591     {
 592         $this->tpl = new RainTPL;
 593         $this->tpl->assign('newversion',escape(checkUpdate()));
 594         $this->tpl->assign('feedurl',escape(indexUrl()));
 595         $searchcrits=''; // Search criteria
 596         if (!empty($_GET['searchtags'])) $searchcrits.='&searchtags='.urlencode($_GET['searchtags']);
 597         elseif (!empty($_GET['searchterm'])) $searchcrits.='&searchterm='.urlencode($_GET['searchterm']);
 598         $this->tpl->assign('searchcrits',$searchcrits);
 599         $this->tpl->assign('source',indexUrl());
 600         $this->tpl->assign('version',shaarli_version);
 601         $this->tpl->assign('scripturl',indexUrl());
 602         $this->tpl->assign('pagetitle','Shaarli');
 603         $this->tpl->assign('privateonly',!empty($_SESSION['privateonly'])); // Show only private links?
 604         if (!empty($GLOBALS['title'])) $this->tpl->assign('pagetitle',$GLOBALS['title']);
 605         if (!empty($GLOBALS['titleLink'])) $this->tpl->assign('titleLink',$GLOBALS['titleLink']);
 606         if (!empty($GLOBALS['pagetitle'])) $this->tpl->assign('pagetitle',$GLOBALS['pagetitle']);
 607         $this->tpl->assign('shaarlititle',empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title'] );
 608         return;
 609     }
 610
 611     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 612     public function assign($what,$where)
 613     {
 614         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 615         $this->tpl->assign($what,$where);
 616     }
 617
 618     // Render a specific page (using a template).
 619     // e.g. pb.renderPage('picwall')
 620     public function renderPage($page)
 621     {
 622         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 623         $this->tpl->draw($page);
 624     }
 625 }
 626
 627 // ------------------------------------------------------------------------------------------
 628 // Output the last N links in RSS 2.0 format.
 629 function showRSS()
 630 {
 631     header('Content-Type: application/rss+xml; charset=utf-8');
 632
 633     // $usepermalink : If true, use permalink instead of final link.
 634     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 635     // Also enabled through a config option
 636     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 637
 638     // Cache system
 639     $query = $_SERVER["QUERY_STRING"];
 640     $cache = new CachedPage(
 641         $GLOBALS['config']['PAGECACHE'],
 642         pageUrl(),
 643         startsWith($query,'do=rss') && !isLoggedIn()
 644     );
 645     $cached = $cache->cachedVersion();
 646     if (! empty($cached)) {
 647         echo $cached;
 648         exit;
 649     }
 650
 651     // If cached was not found (or not usable), then read the database and build the response:
 652     $LINKSDB = new LinkDB(
 653         $GLOBALS['config']['DATASTORE'],
 654         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 655         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 656     );
 657     // Read links from database (and filter private links if user it not logged in).
 658
 659     // Optionally filter the results:
 660     $linksToDisplay=array();
 661     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 662     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 663     else $linksToDisplay = $LINKSDB;
 664
 665     $nblinksToDisplay = 50;  // Number of links to display.
 666     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 667     {
 668         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 669     }
 670
 671     $pageaddr=escape(indexUrl());
 672     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 673     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 674     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 675     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 676     {
 677         echo '<!-- PubSubHubbub Discovery -->';
 678         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 679         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 680         echo '<!-- End Of PubSubHubbub Discovery -->';
 681     }
 682     $i=0;
 683     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 684     while ($i<$nblinksToDisplay && $i<count($keys))
 685     {
 686         $link = $linksToDisplay[$keys[$i]];
 687         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 688         $rfc822date = linkdate2rfc822($link['linkdate']);
 689         $absurl = $link['url'];
 690         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 691         if ($usepermalinks===true)
 692             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 693         else
 694             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 695         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 696         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 697         {
 698             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 699         }
 700
 701         // Add permalink in description
 702         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 703         // If user wants permalinks first, put the final link in description
 704         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 705         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 706         echo '<description><![CDATA['.nl2br(keepMultipleSpaces(text2clickable($link['description']))).$descriptionlink.']]></description>'."\n</item>\n";
 707         $i++;
 708     }
 709     echo '</channel></rss><!-- Cached version of '.escape(pageUrl()).' -->';
 710
 711     $cache->cache(ob_get_contents());
 712     ob_end_flush();
 713     exit;
 714 }
 715
 716 // ------------------------------------------------------------------------------------------
 717 // Output the last N links in ATOM format.
 718 function showATOM()
 719 {
 720     header('Content-Type: application/atom+xml; charset=utf-8');
 721
 722     // $usepermalink : If true, use permalink instead of final link.
 723     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 724     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 725
 726     // Cache system
 727     $query = $_SERVER["QUERY_STRING"];
 728     $cache = new CachedPage(
 729         $GLOBALS['config']['PAGECACHE'],
 730         pageUrl(),
 731         startsWith($query,'do=atom') && !isLoggedIn()
 732     );
 733     $cached = $cache->cachedVersion();
 734     if (!empty($cached)) {
 735         echo $cached;
 736         exit;
 737     }
 738
 739     // If cached was not found (or not usable), then read the database and build the response:
 740     // Read links from database (and filter private links if used it not logged in).
 741     $LINKSDB = new LinkDB(
 742         $GLOBALS['config']['DATASTORE'],
 743         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 744         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 745     );
 746
 747     // Optionally filter the results:
 748     $linksToDisplay=array();
 749     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 750     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 751     else $linksToDisplay = $LINKSDB;
 752
 753     $nblinksToDisplay = 50;  // Number of links to display.
 754     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 755     {
 756         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 757     }
 758
 759     $pageaddr=escape(indexUrl());
 760     $latestDate = '';
 761     $entries='';
 762     $i=0;
 763     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 764     while ($i<$nblinksToDisplay && $i<count($keys))
 765     {
 766         $link = $linksToDisplay[$keys[$i]];
 767         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 768         $iso8601date = linkdate2iso8601($link['linkdate']);
 769         $latestDate = max($latestDate,$iso8601date);
 770         $absurl = $link['url'];
 771         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 772         $entries.='<entry><title>'.$link['title'].'</title>';
 773         if ($usepermalinks===true)
 774             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 775         else
 776             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 777         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 778
 779         // Add permalink in description
 780         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 781         // If user wants permalinks first, put the final link in description
 782         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 783         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 784
 785         $entries.='<content type="html"><![CDATA['.nl2br(keepMultipleSpaces(text2clickable($link['description']))).$descriptionlink."]]></content>\n";
 786         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 787         {
 788             foreach(explode(' ',$link['tags']) as $tag)
 789                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 790         }
 791         $entries.="</entry>\n";
 792         $i++;
 793     }
 794     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 795     $feed.='<title>'.$GLOBALS['title'].'</title>';
 796     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 797     $feed.='<link rel="self" href="'.escape(serverUrl().$_SERVER["REQUEST_URI"]).'" />';
 798     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 799     {
 800         $feed.='<!-- PubSubHubbub Discovery -->';
 801         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 802         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 803     }
 804     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 805     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 806     $feed.=$entries;
 807     $feed.='</feed><!-- Cached version of '.escape(pageUrl()).' -->';
 808     echo $feed;
 809
 810     $cache->cache(ob_get_contents());
 811     ob_end_flush();
 812     exit;
 813 }
 814
 815 // ------------------------------------------------------------------------------------------
 816 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 817 // Gives the last 7 days (which have links).
 818 // This RSS feed cannot be filtered.
 819 function showDailyRSS() {
 820     // Cache system
 821     $query = $_SERVER["QUERY_STRING"];
 822     $cache = new CachedPage(
 823         $GLOBALS['config']['PAGECACHE'],
 824         pageUrl(),
 825         startsWith($query,'do=dailyrss') && !isLoggedIn()
 826     );
 827     $cached = $cache->cachedVersion();
 828     if (!empty($cached)) {
 829         echo $cached;
 830         exit;
 831     }
 832
 833     // If cached was not found (or not usable), then read the database and build the response:
 834     // Read links from database (and filter private links if used it not logged in).
 835     $LINKSDB = new LinkDB(
 836         $GLOBALS['config']['DATASTORE'],
 837         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 838         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 839     );
 840
 841     /* Some Shaarlies may have very few links, so we need to look
 842        back in time (rsort()) until we have enough days ($nb_of_days).
 843     */
 844     $linkdates = array();
 845     foreach ($LINKSDB as $linkdate => $value) {
 846         $linkdates[] = $linkdate;
 847     }
 848     rsort($linkdates);
 849     $nb_of_days = 7; // We take 7 days.
 850     $today = Date('Ymd');
 851     $days = array();
 852
 853     foreach ($linkdates as $linkdate) {
 854         $day = substr($linkdate, 0, 8); // Extract day (without time)
 855         if (strcmp($day,$today) < 0) {
 856             if (empty($days[$day])) {
 857                 $days[$day] = array();
 858             }
 859             $days[$day][] = $linkdate;
 860         }
 861
 862         if (count($days) > $nb_of_days) {
 863             break; // Have we collected enough days?
 864         }
 865     }
 866
 867     // Build the RSS feed.
 868     header('Content-Type: application/rss+xml; charset=utf-8');
 869     $pageaddr = escape(indexUrl());
 870     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 871     echo '<channel>';
 872     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 873     echo '<link>'. $pageaddr .'</link>';
 874     echo '<description>Daily shared links</description>';
 875     echo '<language>en-en</language>';
 876     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 877
 878     // For each day.
 879     foreach ($days as $day => $linkdates) {
 880         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 881         $rfc822date = linkdate2rfc822($day.'_000000');
 882         $absurl = escape(indexUrl().'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 883
 884         // Build the HTML body of this RSS entry.
 885         $html = '';
 886         $href = '';
 887         $links = array();
 888
 889         // We pre-format some fields for proper output.
 890         foreach ($linkdates as $linkdate) {
 891             $l = $LINKSDB[$linkdate];
 892             $l['formatedDescription'] = nl2br(keepMultipleSpaces(text2clickable($l['description'])));
 893             $l['thumbnail'] = thumbnail($l['url']);
 894             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 895             if (startsWith($l['url'], '?')) {
 896                 $l['url'] = indexUrl() . $l['url'];  // make permalink URL absolute
 897             }
 898             $links[$linkdate] = $l;
 899         }
 900
 901         // Then build the HTML for this day:
 902         $tpl = new RainTPL;
 903         $tpl->assign('title', $GLOBALS['title']);
 904         $tpl->assign('daydate', $daydate);
 905         $tpl->assign('absurl', $absurl);
 906         $tpl->assign('links', $links);
 907         $tpl->assign('rfc822date', escape($rfc822date));
 908         $html = $tpl->draw('dailyrss', $return_string=true);
 909
 910         echo $html . PHP_EOL;
 911     }
 912     echo '</channel></rss><!-- Cached version of '. escape(pageUrl()) .' -->';
 913
 914     $cache->cache(ob_get_contents());
 915     ob_end_flush();
 916     exit;
 917 }
 918
 919 // "Daily" page.
 920 function showDaily()
 921 {
 922     $LINKSDB = new LinkDB(
 923         $GLOBALS['config']['DATASTORE'],
 924         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 925         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 926     );
 927
 928     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 929     if (isset($_GET['day'])) $day=$_GET['day'];
 930
 931     $days = $LINKSDB->days();
 932     $i = array_search($day,$days);
 933     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 934     $previousday='';
 935     $nextday='';
 936     if ($i!==false)
 937     {
 938         if ($i>=1) $previousday=$days[$i-1];
 939         if ($i<count($days)-1) $nextday=$days[$i+1];
 940     }
 941
 942     try {
 943         $linksToDisplay = $LINKSDB->filterDay($day);
 944     } catch (Exception $exc) {
 945         error_log($exc);
 946         $linksToDisplay = array();
 947     }
 948
 949     // We pre-format some fields for proper output.
 950     foreach($linksToDisplay as $key=>$link)
 951     {
 952
 953         $taglist = explode(' ',$link['tags']);
 954         uasort($taglist, 'strcasecmp');
 955         $linksToDisplay[$key]['taglist']=$taglist;
 956         $linksToDisplay[$key]['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
 957         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 958         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
 959     }
 960
 961     /* We need to spread the articles on 3 columns.
 962        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 963        so I manually spread entries with a simple method: I roughly evaluate the
 964        height of a div according to title and description length.
 965     */
 966     $columns=array(array(),array(),array()); // Entries to display, for each column.
 967     $fill=array(0,0,0);  // Rough estimate of columns fill.
 968     foreach($linksToDisplay as $key=>$link)
 969     {
 970         // Roughly estimate length of entry (by counting characters)
 971         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 972         // Description: 836 characters gives roughly 342 pixel height.
 973         // This is not perfect, but it's usually OK.
 974         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 975         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 976         // Then put in column which is the less filled:
 977         $smallest=min($fill); // find smallest value in array.
 978         $index=array_search($smallest,$fill); // find index of this smallest value.
 979         array_push($columns[$index],$link); // Put entry in this column.
 980         $fill[$index]+=$length;
 981     }
 982     $PAGE = new pageBuilder;
 983     $PAGE->assign('linksToDisplay',$linksToDisplay);
 984     $PAGE->assign('linkcount',count($LINKSDB));
 985     $PAGE->assign('cols', $columns);
 986     $PAGE->assign('day',linkdate2timestamp($day.'_000000'));
 987     $PAGE->assign('previousday',$previousday);
 988     $PAGE->assign('nextday',$nextday);
 989     $PAGE->renderPage('daily');
 990     exit;
 991 }
 992
 993
 994 // ------------------------------------------------------------------------------------------
 995 // Render HTML page (according to URL parameters and user rights)
 996 function renderPage()
 997 {
 998     $LINKSDB = new LinkDB(
 999         $GLOBALS['config']['DATASTORE'],
1000         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1001         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1002     );
1003
1004     // -------- Display login form.
1005     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=login'))
1006     {
1007         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1008         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1009         $PAGE = new pageBuilder;
1010         $PAGE->assign('token',$token);
1011         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1012         $PAGE->renderPage('loginform');
1013         exit;
1014     }
1015     // -------- User wants to logout.
1016     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1017     {
1018         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1019         logout();
1020         header('Location: ?');
1021         exit;
1022     }
1023
1024     // -------- Picture wall
1025     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=picwall'))
1026     {
1027         // Optionally filter the results:
1028         $links=array();
1029         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1030         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1031         else $links = $LINKSDB;
1032
1033         $body='';
1034         $linksToDisplay=array();
1035
1036         // Get only links which have a thumbnail.
1037         foreach($links as $link)
1038         {
1039             $permalink='?'.escape(smallhash($link['linkdate']));
1040             $thumb=lazyThumbnail($link['url'],$permalink);
1041             if ($thumb!='') // Only output links which have a thumbnail.
1042             {
1043                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1044                 $linksToDisplay[]=$link; // Add to array.
1045             }
1046         }
1047
1048         $PAGE = new pageBuilder;
1049         $PAGE->assign('linkcount',count($LINKSDB));
1050         $PAGE->assign('linksToDisplay',$linksToDisplay);
1051         $PAGE->renderPage('picwall');
1052         exit;
1053     }
1054
1055     // -------- Tag cloud
1056     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
1057     {
1058         $tags= $LINKSDB->allTags();
1059
1060         // We sort tags alphabetically, then choose a font size according to count.
1061         // First, find max value.
1062         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1063         ksort($tags);
1064         $tagList=array();
1065         foreach($tags as $key=>$value)
1066         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1067         {
1068             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1069         }
1070         $PAGE = new pageBuilder;
1071         $PAGE->assign('linkcount',count($LINKSDB));
1072         $PAGE->assign('tags',$tagList);
1073         $PAGE->renderPage('tagcloud');
1074         exit;
1075     }
1076
1077     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1078     if (isset($_GET['addtag']))
1079     {
1080         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1081         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1082         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1083
1084         // Prevent redirection loop
1085         if (isset($params['addtag'])) {
1086             unset($params['addtag']);
1087         }
1088
1089         // Check if this tag is already in the search query and ignore it if it is.
1090         // Each tag is always separated by a space
1091         if (isset($params['searchtags'])) {
1092             $current_tags = explode(' ', $params['searchtags']);
1093         } else {
1094             $current_tags = array();
1095         }
1096         $addtag = true;
1097         foreach ($current_tags as $value) {
1098             if ($value === $_GET['addtag']) {
1099                 $addtag = false;
1100                 break;
1101             }
1102         }
1103         // Append the tag if necessary
1104         if (empty($params['searchtags'])) {
1105             $params['searchtags'] = trim($_GET['addtag']);
1106         }
1107         else if ($addtag) {
1108             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1109         }
1110
1111         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1112         header('Location: ?'.http_build_query($params));
1113         exit;
1114     }
1115
1116     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1117     if (isset($_GET['removetag'])) {
1118         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1119         if (empty($_SERVER['HTTP_REFERER'])) {
1120             header('Location: ?');
1121             exit;
1122         }
1123
1124         // In case browser does not send HTTP_REFERER
1125         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1126
1127         // Prevent redirection loop
1128         if (isset($params['removetag'])) {
1129             unset($params['removetag']);
1130         }
1131
1132         if (isset($params['searchtags'])) {
1133             $tags = explode(' ',$params['searchtags']);
1134             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1135             if (count($tags)==0) {
1136                 unset($params['searchtags']);
1137             } else {
1138                 $params['searchtags'] = implode(' ',$tags);
1139             }
1140             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1141         }
1142         header('Location: ?'.http_build_query($params));
1143         exit;
1144     }
1145
1146     // -------- User wants to change the number of links per page (linksperpage=...)
1147     if (isset($_GET['linksperpage'])) {
1148         if (is_numeric($_GET['linksperpage'])) {
1149             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1150         }
1151
1152         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1153         exit;
1154     }
1155
1156     // -------- User wants to see only private links (toggle)
1157     if (isset($_GET['privateonly'])) {
1158         if (empty($_SESSION['privateonly'])) {
1159             $_SESSION['privateonly'] = 1; // See only private links
1160         } else {
1161             unset($_SESSION['privateonly']); // See all links
1162         }
1163
1164         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1165         exit;
1166     }
1167
1168     // -------- Handle other actions allowed for non-logged in users:
1169     if (!isLoggedIn())
1170     {
1171         // User tries to post new link but is not logged in:
1172         // Show login screen, then redirect to ?post=...
1173         if (isset($_GET['post']))
1174         {
1175             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1176             exit;
1177         }
1178
1179                 // Same case as above except that user tried to access ?do=addlink without being logged in
1180                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1181                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1182                         header('Location: ?do=login&post=');
1183                         exit;
1184                 }
1185
1186         if (isset($_GET['edit_link'])) {
1187             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1188             exit;
1189         }
1190
1191         $PAGE = new pageBuilder;
1192         buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1193         $PAGE->renderPage('linklist');
1194         exit; // Never remove this one! All operations below are reserved for logged in user.
1195     }
1196
1197     // -------- All other functions are reserved for the registered user:
1198
1199     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1200     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tools'))
1201     {
1202         $PAGE = new pageBuilder;
1203         $PAGE->assign('linkcount',count($LINKSDB));
1204         $PAGE->assign('pageabsaddr',indexUrl());
1205         $PAGE->renderPage('tools');
1206         exit;
1207     }
1208
1209     // -------- User wants to change his/her password.
1210     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
1211     {
1212         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1213         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1214         {
1215             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1216
1217             // Make sure old password is correct.
1218             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1219             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1220             // Save new password
1221             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1222             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1223             try {
1224                 writeConfig($GLOBALS, isLoggedIn());
1225             }
1226             catch(Exception $e) {
1227                 error_log(
1228                     'ERROR while writing config file after changing password.' . PHP_EOL .
1229                     $e->getMessage()
1230                 );
1231
1232                 // TODO: do not handle exceptions/errors in JS.
1233                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1234                 exit;
1235             }
1236             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1237             exit;
1238         }
1239         else // show the change password form.
1240         {
1241             $PAGE = new pageBuilder;
1242             $PAGE->assign('linkcount',count($LINKSDB));
1243             $PAGE->assign('token',getToken());
1244             $PAGE->renderPage('changepassword');
1245             exit;
1246         }
1247     }
1248
1249     // -------- User wants to change configuration
1250     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=configure'))
1251     {
1252         if (!empty($_POST['title']) )
1253         {
1254             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1255             $tz = 'UTC';
1256             if (!empty($_POST['continent']) && !empty($_POST['city']))
1257                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1258                     $tz = $_POST['continent'].'/'.$_POST['city'];
1259             $GLOBALS['timezone'] = $tz;
1260             $GLOBALS['title']=$_POST['title'];
1261             $GLOBALS['titleLink']=$_POST['titleLink'];
1262             $GLOBALS['redirector']=$_POST['redirector'];
1263             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1264             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1265             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1266             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1267             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1268             try {
1269                 writeConfig($GLOBALS, isLoggedIn());
1270             }
1271             catch(Exception $e) {
1272                 error_log(
1273                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1274                     $e->getMessage()
1275                 );
1276
1277                 // TODO: do not handle exceptions/errors in JS.
1278                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1279                 exit;
1280             }
1281             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1282             exit;
1283         }
1284         else // Show the configuration form.
1285         {
1286             $PAGE = new pageBuilder;
1287             $PAGE->assign('linkcount',count($LINKSDB));
1288             $PAGE->assign('token',getToken());
1289             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1290             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1291             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1292             $PAGE->assign('timezone_form', $timezone_form);
1293             $PAGE->assign('timezone_js',$timezone_js);
1294             $PAGE->renderPage('configure');
1295             exit;
1296         }
1297     }
1298
1299     // -------- User wants to rename a tag or delete it
1300     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changetag'))
1301     {
1302         if (empty($_POST['fromtag']))
1303         {
1304             $PAGE = new pageBuilder;
1305             $PAGE->assign('linkcount',count($LINKSDB));
1306             $PAGE->assign('token',getToken());
1307             $PAGE->assign('tags', $LINKSDB->allTags());
1308             $PAGE->renderPage('changetag');
1309             exit;
1310         }
1311         if (!tokenOk($_POST['token'])) die('Wrong token.');
1312
1313         // Delete a tag:
1314         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1315         {
1316             $needle=trim($_POST['fromtag']);
1317             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1318             foreach($linksToAlter as $key=>$value)
1319             {
1320                 $tags = explode(' ',trim($value['tags']));
1321                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1322                 $value['tags']=trim(implode(' ',$tags));
1323                 $LINKSDB[$key]=$value;
1324             }
1325             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1326             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1327             exit;
1328         }
1329
1330         // Rename a tag:
1331         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1332         {
1333             $needle=trim($_POST['fromtag']);
1334             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1335             foreach($linksToAlter as $key=>$value)
1336             {
1337                 $tags = explode(' ',trim($value['tags']));
1338                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1339                 $value['tags']=trim(implode(' ',$tags));
1340                 $LINKSDB[$key]=$value;
1341             }
1342             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1343             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1344             exit;
1345         }
1346     }
1347
1348     // -------- User wants to add a link without using the bookmarklet: Show form.
1349     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=addlink'))
1350     {
1351         $PAGE = new pageBuilder;
1352         $PAGE->assign('linkcount',count($LINKSDB));
1353         $PAGE->renderPage('addlink');
1354         exit;
1355     }
1356
1357     // -------- User clicked the "Save" button when editing a link: Save link to database.
1358     if (isset($_POST['save_edit']))
1359     {
1360         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1361         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1362         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1363         $linkdate=$_POST['lf_linkdate'];
1364         $url = trim($_POST['lf_url']);
1365         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1366             $url = 'http://'.$url;
1367         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1368                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1369         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1370         $LINKSDB[$linkdate] = $link;
1371         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1372         pubsubhub();
1373
1374         // If we are called from the bookmarklet, we must close the popup:
1375         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1376         $returnurl = ( !empty($_POST['returnurl']) ? escape($_POST['returnurl']) : '?' );
1377         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1378         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1379         header('Location: '. $location); // After saving the link, redirect to the page the user was on.
1380         exit;
1381     }
1382
1383     // -------- User clicked the "Cancel" button when editing a link.
1384     if (isset($_POST['cancel_edit']))
1385     {
1386         // If we are called from the bookmarklet, we must close the popup:
1387         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1388         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1389         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1390         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1391         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1392         exit;
1393     }
1394
1395     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1396     if (isset($_POST['delete_link']))
1397     {
1398         if (!tokenOk($_POST['token'])) die('Wrong token.');
1399         // We do not need to ask for confirmation:
1400         // - confirmation is handled by JavaScript
1401         // - we are protected from XSRF by the token.
1402         $linkdate=$_POST['lf_linkdate'];
1403         unset($LINKSDB[$linkdate]);
1404         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1405
1406         // If we are called from the bookmarklet, we must close the popup:
1407         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1408         // Pick where we're going to redirect
1409         // =============================================================
1410         // Basically, we can't redirect to where we were previously if it was a permalink
1411         // or an edit_link, because it would 404.
1412         // Cases:
1413         //    - /             : nothing in $_GET, redirect to self
1414         //    - /?page        : redirect to self
1415         //    - /?searchterm  : redirect to self (there might be other links)
1416         //    - /?searchtags  : redirect to self
1417         //    - /permalink    : redirect to / (the link does not exist anymore)
1418         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1419         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1420         // redirect is not satisfied, and only then redirect to /
1421         $location = "?";
1422         // Self redirection
1423         if (count($_GET) == 0
1424             || isset($_GET['page'])
1425             || isset($_GET['searchterm'])
1426             || isset($_GET['searchtags'])
1427         ) {
1428             if (isset($_POST['returnurl'])) {
1429                 $location = $_POST['returnurl']; // Handle redirects given by the form
1430             } else {
1431                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1432             }
1433         }
1434
1435         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1436         exit;
1437     }
1438
1439     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1440     if (isset($_GET['edit_link']))
1441     {
1442         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1443         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1444         $PAGE = new pageBuilder;
1445         $PAGE->assign('linkcount',count($LINKSDB));
1446         $PAGE->assign('link',$link);
1447         $PAGE->assign('link_is_new',false);
1448         $PAGE->assign('token',getToken()); // XSRF protection.
1449         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''));
1450         $PAGE->assign('tags', $LINKSDB->allTags());
1451         $PAGE->renderPage('editlink');
1452         exit;
1453     }
1454
1455     // -------- User want to post a new link: Display link edit form.
1456     if (isset($_GET['post'])) {
1457         $url = new Url($_GET['post']);
1458         $url->cleanup();
1459
1460         $link_is_new = false;
1461         // Check if URL is not already in database (in this case, we will edit the existing link)
1462         $link = $LINKSDB->getLinkFromUrl((string)$url);
1463         if (!$link)
1464         {
1465             $link_is_new = true;
1466             $linkdate = strval(date('Ymd_His'));
1467             // Get title if it was provided in URL (by the bookmarklet).
1468             $title = (empty($_GET['title']) ? '' : $_GET['title'] );
1469             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1470             $description = (empty($_GET['description']) ? '' : $_GET['description']);
1471             $tags = (empty($_GET['tags']) ? '' : $_GET['tags'] );
1472             $private = (!empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0);
1473             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1474             if (empty($title) && strpos($url->getScheme(), 'http') !== false) {
1475                 // Short timeout to keep the application responsive
1476                 list($headers, $data) = get_http_url($url, 4);
1477                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1478                 if (strpos($headers[0], '200 OK') !== false) {
1479                     // Look for charset in html header.
1480                     preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1481
1482                     // If found, extract encoding.
1483                     if (!empty($meta[0])) {
1484                         // Get encoding specified in header.
1485                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1486                         // If charset not found, use utf-8.
1487                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1488                     }
1489                     else {
1490                         $html_charset = 'utf-8';
1491                     }
1492
1493                     // Extract title
1494                     $title = html_extract_title($data);
1495                     if (!empty($title)) {
1496                         // Re-encode title in utf-8 if necessary.
1497                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1498                     }
1499                 }
1500             }
1501             if ($url == '') {
1502                 $url = '?' . smallHash($linkdate);
1503                 $title = 'Note: ';
1504             }
1505             $link = array(
1506                 'linkdate' => $linkdate,
1507                 'title' => $title,
1508                 'url' => (string)$url,
1509                 'description' => $description,
1510                 'tags' => $tags,
1511                 'private' => $private
1512             );
1513         }
1514
1515         $PAGE = new pageBuilder;
1516         $PAGE->assign('linkcount',count($LINKSDB));
1517         $PAGE->assign('link',$link);
1518         $PAGE->assign('link_is_new',$link_is_new);
1519         $PAGE->assign('token',getToken()); // XSRF protection.
1520         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1521         $PAGE->assign('source',(isset($_GET['source']) ? $_GET['source'] : ''));
1522         $PAGE->assign('tags', $LINKSDB->allTags());
1523         $PAGE->renderPage('editlink');
1524         exit;
1525     }
1526
1527     // -------- Export as Netscape Bookmarks HTML file.
1528     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=export'))
1529     {
1530         if (empty($_GET['what']))
1531         {
1532             $PAGE = new pageBuilder;
1533             $PAGE->assign('linkcount',count($LINKSDB));
1534             $PAGE->renderPage('export');
1535             exit;
1536         }
1537         $exportWhat=$_GET['what'];
1538         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1539
1540         header('Content-Type: text/html; charset=utf-8');
1541         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1542         $currentdate=date('Y/m/d H:i:s');
1543         echo <<<HTML
1544 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1545 <!-- This is an automatically generated file.
1546      It will be read and overwritten.
1547      DO NOT EDIT! -->
1548 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1549 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1550 <TITLE>Bookmarks</TITLE>
1551 <H1>Bookmarks</H1>
1552 HTML;
1553         foreach($LINKSDB as $link)
1554         {
1555             if ($exportWhat=='all' ||
1556                ($exportWhat=='private' && $link['private']!=0) ||
1557                ($exportWhat=='public' && $link['private']==0))
1558             {
1559                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1560                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1561                 echo '>'.$link['title']."</A>\n";
1562                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1563             }
1564         }
1565                 exit;
1566     }
1567
1568     // -------- User is uploading a file for import
1569     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1570     {
1571         // If file is too big, some form field may be missing.
1572         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1573         {
1574             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1575             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1576             exit;
1577         }
1578         if (!tokenOk($_POST['token'])) die('Wrong token.');
1579         importFile();
1580         exit;
1581     }
1582
1583     // -------- Show upload/import dialog:
1584     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=import'))
1585     {
1586         $PAGE = new pageBuilder;
1587         $PAGE->assign('linkcount',count($LINKSDB));
1588         $PAGE->assign('token',getToken());
1589         $PAGE->assign('maxfilesize',getMaxFileSize());
1590         $PAGE->renderPage('import');
1591         exit;
1592     }
1593
1594     // -------- Otherwise, simply display search form and links:
1595     $PAGE = new pageBuilder;
1596     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1597     $PAGE->renderPage('linklist');
1598     exit;
1599 }
1600
1601 // -----------------------------------------------------------------------------------------------
1602 // Process the import file form.
1603 function importFile()
1604 {
1605     if (!(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'])) { die('Not allowed.'); }
1606     $LINKSDB = new LinkDB(
1607         $GLOBALS['config']['DATASTORE'],
1608         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1609         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1610     );
1611     $filename=$_FILES['filetoupload']['name'];
1612     $filesize=$_FILES['filetoupload']['size'];
1613     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1614     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1615     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1616     $import_count=0;
1617
1618     // Sniff file type:
1619     $type='unknown';
1620     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1621
1622     // Then import the bookmarks.
1623     if ($type=='netscape')
1624     {
1625         // This is a standard Netscape-style bookmark file.
1626         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1627         foreach(explode('<DT>',$data) as $html) // explode is very fast
1628         {
1629             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1630             $d = explode('<DD>',$html);
1631             if (startswith($d[0],'<A '))
1632             {
1633                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1634                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1635                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1636                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1637                 $raw_add_date=0;
1638                 foreach($matches as $m)
1639                 {
1640                     $attr=$m[1]; $value=$m[2];
1641                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1642                     elseif ($attr=='ADD_DATE')
1643                     {
1644                         $raw_add_date=intval($value);
1645                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1646                     }
1647                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1648                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1649                 }
1650                 if ($link['url']!='')
1651                 {
1652                     if ($private==1) $link['private']=1;
1653                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1654                     if ($dblink==false)
1655                     {  // Link not in database, let's import it...
1656                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1657
1658                        // Make sure date/time is not already used by another link.
1659                        // (Some bookmark files have several different links with the same ADD_DATE)
1660                        // We increment date by 1 second until we find a date which is not used in DB.
1661                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1662                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1663                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1664                        $LINKSDB[$link['linkdate']] = $link;
1665                        $import_count++;
1666                     }
1667                     else // Link already present in database.
1668                     {
1669                         if ($overwrite)
1670                         {   // If overwrite is required, we import link data, except date/time.
1671                             $link['linkdate']=$dblink['linkdate'];
1672                             $LINKSDB[$link['linkdate']] = $link;
1673                             $import_count++;
1674                         }
1675                     }
1676
1677                 }
1678             }
1679         }
1680         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1681
1682         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1683     }
1684     else
1685     {
1686         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1687     }
1688 }
1689
1690 // -----------------------------------------------------------------------------------------------
1691 // Template for the list of links (<div id="linklist">)
1692 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1693 function buildLinkList($PAGE,$LINKSDB)
1694 {
1695     // ---- Filter link database according to parameters
1696     $linksToDisplay=array();
1697     $search_type='';
1698     $search_crits='';
1699     if (isset($_GET['searchterm'])) // Fulltext search
1700     {
1701         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1702         $search_crits=escape(trim($_GET['searchterm']));
1703         $search_type='fulltext';
1704     }
1705     elseif (isset($_GET['searchtags'])) // Search by tag
1706     {
1707         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1708         $search_crits=explode(' ',escape(trim($_GET['searchtags'])));
1709         $search_type='tags';
1710     }
1711     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1712     {
1713         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1714         if (count($linksToDisplay)==0)
1715         {
1716             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1717             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1718             echo '<br>Would you mind <a href="?">clicking here</a>?';
1719             exit;
1720         }
1721         $search_type='permalink';
1722     }
1723     else
1724         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1725
1726
1727     // Option: Show only private links
1728     if (!empty($_SESSION['privateonly']))
1729     {
1730         $tmp = array();
1731         foreach($linksToDisplay as $linkdate=>$link)
1732         {
1733             if ($link['private']!=0) $tmp[$linkdate]=$link;
1734         }
1735         $linksToDisplay=$tmp;
1736     }
1737
1738     // ---- Handle paging.
1739     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1740        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1741        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1742     */
1743     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1744
1745     // If there is only a single link, we change on-the-fly the title of the page.
1746     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1747
1748     // Select articles according to paging.
1749     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1750     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1751     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1752     $page = ( $page<1 ? 1 : $page );
1753     $page = ( $page>$pagecount ? $pagecount : $page );
1754     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1755     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1756     $linkDisp=array(); // Links to display
1757     while ($i<$end && $i<count($keys))
1758     {
1759         $link = $linksToDisplay[$keys[$i]];
1760         $link['description']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
1761         $title=$link['title'];
1762         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1763         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1764         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1765         $taglist = explode(' ',$link['tags']);
1766         uasort($taglist, 'strcasecmp');
1767         $link['taglist']=$taglist;
1768
1769         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1770             strlen($link["url"]) === 7) {
1771             $link["url"] = indexUrl() . $link["url"];
1772         }
1773
1774         $linkDisp[$keys[$i]] = $link;
1775         $i++;
1776     }
1777
1778     // Compute paging navigation
1779     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1780     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1781     $paging='';
1782     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1783     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1784
1785     $token = ''; if (isLoggedIn()) $token=getToken();
1786
1787     // Fill all template fields.
1788     $PAGE->assign('linkcount',count($LINKSDB));
1789     $PAGE->assign('previous_page_url',$previous_page_url);
1790     $PAGE->assign('next_page_url',$next_page_url);
1791     $PAGE->assign('page_current',$page);
1792     $PAGE->assign('page_max',$pagecount);
1793     $PAGE->assign('result_count',count($linksToDisplay));
1794     $PAGE->assign('search_type',$search_type);
1795     $PAGE->assign('search_crits',$search_crits);
1796     $PAGE->assign('redirector',empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector']); // Optional redirector URL.
1797     $PAGE->assign('token',$token);
1798     $PAGE->assign('links',$linkDisp);
1799     $PAGE->assign('tags', $LINKSDB->allTags());
1800     return;
1801 }
1802
1803 // Compute the thumbnail for a link.
1804 //
1805 // With a link to the original URL.
1806 // Understands various services (youtube.com...)
1807 // Input: $url = URL for which the thumbnail must be found.
1808 //        $href = if provided, this URL will be followed instead of $url
1809 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1810 // Some of them may be missing.
1811 // Return an empty array if no thumbnail available.
1812 function computeThumbnail($url,$href=false)
1813 {
1814     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1815     if ($href==false) $href=$url;
1816
1817     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1818     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1819     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1820     $domain = parse_url($url,PHP_URL_HOST);
1821     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1822     {
1823         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1824         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1825                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1826     }
1827     if ($domain=='youtu.be') // Youtube short links
1828     {
1829         $path = parse_url($url,PHP_URL_PATH);
1830         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1831                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1832     }
1833     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1834     {
1835         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1836         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1837                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1838     }
1839
1840     if ($domain=='imgur.com')
1841     {
1842         $path = parse_url($url,PHP_URL_PATH);
1843         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1844         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1845                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1846         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1847                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1848
1849         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1850                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1851     }
1852     if ($domain=='i.imgur.com')
1853     {
1854         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1855         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1856                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1857     }
1858     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1859     {
1860         if (strpos($url,'dailymotion.com/video/')!==false)
1861         {
1862             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1863             return array('src'=>$thumburl,
1864                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1865         }
1866     }
1867     if (endsWith($domain,'.imageshack.us'))
1868     {
1869         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1870         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1871         {
1872             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1873             return array('src'=>$thumburl,
1874                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1875         }
1876     }
1877
1878     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1879     // So we deport the thumbnail generation in order not to slow down page generation
1880     // (and we also cache the thumbnail)
1881
1882     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1883
1884     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1885         || $domain=='vimeo.com'
1886         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1887         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1888     )
1889     {
1890         if ($domain=='vimeo.com')
1891         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1892             $path = parse_url($url,PHP_URL_PATH);
1893             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1894         }
1895         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1896         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1897             $path = parse_url($url,PHP_URL_PATH);
1898             if (!preg_match('!/\d+.+?!',$path)) return array();
1899         }
1900         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1901         {   // Make sure this TED URL points to a video (/talks/...)
1902             $path = parse_url($url,PHP_URL_PATH);
1903             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1904         }
1905         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1906         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1907                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1908     }
1909
1910     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1911     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1912     // But using the extension will do.
1913     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1914     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1915     {
1916         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1917         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1918                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1919     }
1920     return array(); // No thumbnail.
1921
1922 }
1923
1924
1925 // Returns the HTML code to display a thumbnail for a link
1926 // with a link to the original URL.
1927 // Understands various services (youtube.com...)
1928 // Input: $url = URL for which the thumbnail must be found.
1929 //        $href = if provided, this URL will be followed instead of $url
1930 // Returns '' if no thumbnail available.
1931 function thumbnail($url,$href=false)
1932 {
1933     $t = computeThumbnail($url,$href);
1934     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1935
1936     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1937     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1938     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1939     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1940     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1941     $html.='></a>';
1942     return $html;
1943 }
1944
1945 // Returns the HTML code to display a thumbnail for a link
1946 // for the picture wall (using lazy image loading)
1947 // Understands various services (youtube.com...)
1948 // Input: $url = URL for which the thumbnail must be found.
1949 //        $href = if provided, this URL will be followed instead of $url
1950 // Returns '' if no thumbnail available.
1951 function lazyThumbnail($url,$href=false)
1952 {
1953     $t = computeThumbnail($url,$href);
1954     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1955
1956     $html='<a href="'.escape($t['href']).'">';
1957
1958     // Lazy image
1959     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1960
1961     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1962     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1963     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1964     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1965     $html.='>';
1966
1967     // No-JavaScript fallback.
1968     $html.='<noscript><img src="'.escape($t['src']).'"';
1969     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1970     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1971     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1972     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1973     $html.='></noscript></a>';
1974
1975     return $html;
1976 }
1977
1978
1979 // -----------------------------------------------------------------------------------------------
1980 // Installation
1981 // This function should NEVER be called if the file data/config.php exists.
1982 function install()
1983 {
1984     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1985     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1986
1987
1988     // This part makes sure sessions works correctly.
1989     // (Because on some hosts, session.save_path may not be set correctly,
1990     // or we may not have write access to it.)
1991     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1992     {   // Step 2: Check if data in session is correct.
1993         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1994         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1995         echo 'It currently points to '.session_save_path().'<br>';
1996         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1997         echo '<br><a href="?">Click to try again.</a></pre>';
1998         die;
1999     }
2000     if (!isset($_SESSION['session_tested']))
2001     {   // Step 1 : Try to store data in session and reload page.
2002         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2003         header('Location: '.indexUrl().'?test_session');  // Redirect to check stored data.
2004     }
2005     if (isset($_GET['test_session']))
2006     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2007         header('Location: '.indexUrl());
2008     }
2009
2010
2011     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2012     {
2013         $tz = 'UTC';
2014         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2015             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2016                 $tz = $_POST['continent'].'/'.$_POST['city'];
2017             }
2018         }
2019         $GLOBALS['timezone'] = $tz;
2020         // Everything is ok, let's create config file.
2021         $GLOBALS['login'] = $_POST['setlogin'];
2022         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2023         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2024         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(indexUrl()) : $_POST['title'] );
2025         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2026         try {
2027             writeConfig($GLOBALS, isLoggedIn());
2028         }
2029         catch(Exception $e) {
2030             error_log(
2031                     'ERROR while writing config file after installation.' . PHP_EOL .
2032                     $e->getMessage()
2033                 );
2034
2035             // TODO: do not handle exceptions/errors in JS.
2036             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2037             exit;
2038         }
2039         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2040         exit;
2041     }
2042
2043     // Display config form:
2044     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2045     $timezone_html = '';
2046     if ($timezone_form != '') {
2047         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2048     }
2049
2050     $PAGE = new pageBuilder;
2051     $PAGE->assign('timezone_html',$timezone_html);
2052     $PAGE->assign('timezone_js',$timezone_js);
2053     $PAGE->renderPage('install');
2054     exit;
2055 }
2056
2057 if (!function_exists('json_encode')) {
2058     function json_encode($data) {
2059         switch ($type = gettype($data)) {
2060             case 'NULL':
2061                 return 'null';
2062             case 'boolean':
2063                 return ($data ? 'true' : 'false');
2064             case 'integer':
2065             case 'double':
2066             case 'float':
2067                 return $data;
2068             case 'string':
2069                 return '"' . addslashes($data) . '"';
2070             case 'object':
2071                 $data = get_object_vars($data);
2072             case 'array':
2073                 $output_index_count = 0;
2074                 $output_indexed = array();
2075                 $output_associative = array();
2076                 foreach ($data as $key => $value) {
2077                     $output_indexed[] = json_encode($value);
2078                     $output_associative[] = json_encode($key) . ':' . json_encode($value);
2079                     if ($output_index_count !== NULL && $output_index_count++ !== $key) {
2080                         $output_index_count = NULL;
2081                     }
2082                 }
2083                 if ($output_index_count !== NULL) {
2084                     return '[' . implode(',', $output_indexed) . ']';
2085                 } else {
2086                     return '{' . implode(',', $output_associative) . '}';
2087                 }
2088             default:
2089                 return ''; // Not supported
2090         }
2091     }
2092 }
2093
2094
2095
2096 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2097    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2098    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2099    This function is called by passing the URL:
2100    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2101    [URL] is the URL of the link (e.g. a flickr page)
2102    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2103    The function below will fetch the image from the webservice and store it in the cache.
2104 */
2105 function genThumbnail()
2106 {
2107     // Make sure the parameters in the URL were generated by us.
2108     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2109     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2110
2111     // Let's see if we don't already have the image for this URL in the cache.
2112     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2113     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2114     {   // We have the thumbnail, just serve it:
2115         header('Content-Type: image/jpeg');
2116         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2117         return;
2118     }
2119     // We may also serve a blank image (if service did not respond)
2120     $blankname=hash('sha1',$_GET['url']).'.gif';
2121     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2122     {
2123         header('Content-Type: image/gif');
2124         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2125         return;
2126     }
2127
2128     // Otherwise, generate the thumbnail.
2129     $url = $_GET['url'];
2130     $domain = parse_url($url,PHP_URL_HOST);
2131
2132     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2133     {
2134         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2135         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2136
2137         // Is this a link to an image, or to a flickr page ?
2138         $imageurl='';
2139         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2140         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2141             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2142             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2143         }
2144         else // This is a flickr page (html)
2145         {
2146             // Get the flickr html page.
2147             list($headers, $data) = get_http_url($url, 20);
2148             if (strpos($headers[0], '200 OK') !== false)
2149             {
2150                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2151                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2152                 if (!empty($matches[1])) $imageurl=$matches[1];
2153
2154                 // In albums (and some other pages), the link rel="image_src" is not provided,
2155                 // but flickr provides:
2156                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2157                 if ($imageurl=='')
2158                 {
2159                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2160                     if (!empty($matches[1])) $imageurl=$matches[1];
2161                 }
2162             }
2163         }
2164
2165         if ($imageurl!='')
2166         {   // Let's download the image.
2167             // Image is 240x120, so 10 seconds to download should be enough.
2168             list($headers, $data) = get_http_url($imageurl, 10);
2169             if (strpos($headers[0], '200 OK') !== false) {
2170                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2171                 header('Content-Type: image/jpeg');
2172                 echo $data;
2173                 return;
2174             }
2175         }
2176     }
2177
2178     elseif ($domain=='vimeo.com' )
2179     {
2180         // This is more complex: we have to perform a HTTP request, then parse the result.
2181         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2182         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2183         list($headers, $data) = get_http_url('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2184         if (strpos($headers[0], '200 OK') !== false) {
2185             $t = unserialize($data);
2186             $imageurl = $t[0]['thumbnail_medium'];
2187             // Then we download the image and serve it to our client.
2188             list($headers, $data) = get_http_url($imageurl, 10);
2189             if (strpos($headers[0], '200 OK') !== false) {
2190                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2191                 header('Content-Type: image/jpeg');
2192                 echo $data;
2193                 return;
2194             }
2195         }
2196     }
2197
2198     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2199     {
2200         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2201         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2202         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2203         list($headers, $data) = get_http_url($url, 5);
2204         if (strpos($headers[0], '200 OK') !== false) {
2205             // Extract the link to the thumbnail
2206             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2207             if (!empty($matches[1]))
2208             {   // Let's download the image.
2209                 $imageurl=$matches[1];
2210                 // No control on image size, so wait long enough
2211                 list($headers, $data) = get_http_url($imageurl, 20);
2212                 if (strpos($headers[0], '200 OK') !== false) {
2213                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2214                     file_put_contents($filepath,$data); // Save image to cache.
2215                     if (resizeImage($filepath))
2216                     {
2217                         header('Content-Type: image/jpeg');
2218                         echo file_get_contents($filepath);
2219                         return;
2220                     }
2221                 }
2222             }
2223         }
2224     }
2225
2226     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2227     {
2228         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2229         // http://xkcd.com/327/
2230         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2231         list($headers, $data) = get_http_url($url, 5);
2232         if (strpos($headers[0], '200 OK') !== false) {
2233             // Extract the link to the thumbnail
2234             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2235             if (!empty($matches[1]))
2236             {   // Let's download the image.
2237                 $imageurl=$matches[1];
2238                 // No control on image size, so wait long enough
2239                 list($headers, $data) = get_http_url($imageurl, 20);
2240                 if (strpos($headers[0], '200 OK') !== false) {
2241                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2242                     file_put_contents($filepath,$data); // Save image to cache.
2243                     if (resizeImage($filepath))
2244                     {
2245                         header('Content-Type: image/jpeg');
2246                         echo file_get_contents($filepath);
2247                         return;
2248                     }
2249                 }
2250             }
2251         }
2252     }
2253
2254     else
2255     {
2256         // For all other domains, we try to download the image and make a thumbnail.
2257         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2258         list($headers, $data) = get_http_url($url, 30);
2259         if (strpos($headers[0], '200 OK') !== false) {
2260             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2261             file_put_contents($filepath,$data); // Save image to cache.
2262             if (resizeImage($filepath))
2263             {
2264                 header('Content-Type: image/jpeg');
2265                 echo file_get_contents($filepath);
2266                 return;
2267             }
2268         }
2269     }
2270
2271
2272     // Otherwise, return an empty image (8x8 transparent gif)
2273     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2274     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2275     header('Content-Type: image/gif');
2276     echo $blankgif;
2277 }
2278
2279 // Make a thumbnail of the image (to width: 120 pixels)
2280 // Returns true if success, false otherwise.
2281 function resizeImage($filepath)
2282 {
2283     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2284
2285     // Trick: some stupid people rename GIF as JPEG... or else.
2286     // So we really try to open each image type whatever the extension is.
2287     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2288     $im=false;
2289     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2290     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2291     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2292     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2293     $w = imagesx($im);
2294     $h = imagesy($im);
2295     $ystart = 0; $yheight=$h;
2296     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2297     $nw = 120;   // Desired width
2298     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2299     // Resize image:
2300     $im2 = imagecreatetruecolor($nw,$nh);
2301     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2302     imageinterlace($im2,true); // For progressive JPEG.
2303     $tempname=$filepath.'_TEMP.jpg';
2304     imagejpeg($im2, $tempname, 90);
2305     imagedestroy($im);
2306     imagedestroy($im2);
2307     unlink($filepath);
2308     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2309     return true;
2310 }
2311
2312 try {
2313     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2314 } catch(Exception $e) {
2315     error_log(
2316         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2317         $e->getMessage()
2318     );
2319 }
2320
2321 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2322 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2323 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2324 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2325 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2326 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2327 renderPage();
2328 ?>