index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.2 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, no-database Delicious clone.
   6  *
   7  * Friendly fork by the Shaarli community:
   8  *  - https://github.com/shaarli/Shaarli
   9  *
  10  * Original project by sebsauvage.net:
  11  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  12  *  - https://github.com/sebsauvage/Shaarli
  13  *
  14  * Licence: http://www.opensource.org/licenses/zlib-license.php
  15  *
  16  * Requires: PHP 5.3.x
  17  */
  18
  19 // Set 'UTC' as the default timezone if it is not defined in php.ini
  20 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  21 if (date_default_timezone_get() == '') {
  22     date_default_timezone_set('UTC');
  23 }
  24
  25 /* -----------------------------------------------------------------------------
  26  * Hardcoded parameters
  27  * You should not touch any code below (or at your own risks!)
  28  * (These parameters can be overwritten by editing the file /data/config.php)
  29  * -----------------------------------------------------------------------------
  30  */
  31
  32 /*
  33  * Shaarli directories & configuration files
  34  */
  35 // Data subdirectory
  36 $GLOBALS['config']['DATADIR'] = 'data';
  37
  38 // Main configuration file
  39 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php';
  40
  41 // Link datastore
  42 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php';
  43
  44 // Banned IPs
  45 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php';
  46
  47 // Access log
  48 $GLOBALS['config']['LOG_FILE'] = $GLOBALS['config']['DATADIR'].'/log.txt';
  49
  50 // For updates check of Shaarli
  51 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt';
  52
  53 // RainTPL cache directory (keep the trailing slash!)
  54 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  55 // Raintpl template directory (keep the trailing slash!)
  56 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  57
  58 // Thumbnail cache directory
  59 $GLOBALS['config']['CACHEDIR'] = 'cache';
  60
  61 // Atom & RSS feed cache directory
  62 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  63
  64
  65 /*
  66  * Global configuration
  67  */
  68 // Ban IP after this many failures
  69 $GLOBALS['config']['BAN_AFTER'] = 4;
  70 // Ban duration for IP address after login failures (in seconds)
  71 $GLOBALS['config']['BAN_DURATION'] = 1800;
  72
  73 // Feed options
  74 // Enable RSS permalinks by default.
  75 // This corresponds to the default behavior of shaarli before this was added as an option.
  76 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  77 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  78 $GLOBALS['config']['SHOW_ATOM'] = false;
  79
  80 // Link display options
  81 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  82 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  83 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  84
  85 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  86 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  87
  88 // Thumbnails
  89 // Display thumbnails in links
  90 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  91 // Store thumbnails in a local cache
  92 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  93
  94 // Update check frequency for Shaarli. 86400 seconds=24 hours
  95 $GLOBALS['config']['UPDATECHECK_BRANCH'] = 'stable';
  96 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400;
  97
  98
  99 /*
 100  * Plugin configuration
 101  *
 102  * Warning: order matters!
 103  *
 104  * These settings may be be overriden in:
 105  *  - data/config.php
 106  *  - each plugin's configuration file
 107  */
 108 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 109 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 110 //    'wallabag', 'markdown', 'addlink_toolbar',
 111 //);
 112 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 113
 114 //$GLOBALS['plugins']['WALLABAG_URL'] = 'https://demo.wallabag.org/';
 115
 116 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 117 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 118
 119 /*
 120  * PHP configuration
 121  */
 122 define('shaarli_version', '0.6.2');
 123
 124 // http://server.com/x/shaarli --> /shaarli/
 125 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 126
 127 // High execution time in case of problematic imports/exports.
 128 ini_set('max_input_time','60');
 129
 130 // Try to set max upload file size and read
 131 ini_set('memory_limit', '128M');
 132 ini_set('post_max_size', '16M');
 133 ini_set('upload_max_filesize', '16M');
 134
 135 // See all error except warnings
 136 error_reporting(E_ALL^E_WARNING);
 137 // See all errors (for debugging only)
 138 //error_reporting(-1);
 139
 140 /*
 141  * User configuration
 142  */
 143 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 144     require_once $GLOBALS['config']['CONFIG_FILE'];
 145 }
 146
 147 // Shaarli library
 148 require_once 'application/ApplicationUtils.php';
 149 require_once 'application/Cache.php';
 150 require_once 'application/CachedPage.php';
 151 require_once 'application/FileUtils.php';
 152 require_once 'application/HttpUtils.php';
 153 require_once 'application/LinkDB.php';
 154 require_once 'application/TimeZone.php';
 155 require_once 'application/Url.php';
 156 require_once 'application/Utils.php';
 157 require_once 'application/Config.php';
 158 require_once 'application/PluginManager.php';
 159 require_once 'application/Router.php';
 160
 161 // Ensure the PHP version is supported
 162 try {
 163     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 164 } catch(Exception $exc) {
 165     header('Content-Type: text/plain; charset=utf-8');
 166     echo $exc->getMessage();
 167     exit;
 168 }
 169
 170 // Force cookie path (but do not change lifetime)
 171 $cookie = session_get_cookie_params();
 172 $cookiedir = '';
 173 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 174     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 175 }
 176 // Set default cookie expiration and path.
 177 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 178 // Set session parameters on server side.
 179 // If the user does not access any page within this time, his/her session is considered expired.
 180 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 181 // Use cookies to store session.
 182 ini_set('session.use_cookies', 1);
 183 // Force cookies for session (phpsessionID forbidden in URL).
 184 ini_set('session.use_only_cookies', 1);
 185 // Prevent PHP form using sessionID in URL if cookies are disabled.
 186 ini_set('session.use_trans_sid', false);
 187
 188 session_name('shaarli');
 189 // Start session if needed (Some server auto-start sessions).
 190 if (session_id() == '') {
 191     session_start();
 192 }
 193
 194 // Regenerate session ID if invalid or not defined in cookie.
 195 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 196     session_regenerate_id(true);
 197     $_COOKIE['shaarli'] = session_id();
 198 }
 199
 200 include "inc/rain.tpl.class.php"; //include Rain TPL
 201 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 202 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 203
 204 $pluginManager = PluginManager::getInstance();
 205 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 206
 207 ob_start();  // Output buffering for the page cache.
 208
 209
 210 // In case stupid admin has left magic_quotes enabled in php.ini:
 211 if (get_magic_quotes_gpc())
 212 {
 213     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 214     $_POST = array_map('stripslashes_deep', $_POST);
 215     $_GET = array_map('stripslashes_deep', $_GET);
 216     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 217 }
 218
 219 // Prevent caching on client side or proxy: (yes, it's ugly)
 220 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 221 header("Cache-Control: no-store, no-cache, must-revalidate");
 222 header("Cache-Control: post-check=0, pre-check=0", false);
 223 header("Pragma: no-cache");
 224
 225 // Handling of old config file which do not have the new parameters.
 226 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 227 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 228 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 229 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 230 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 231 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 232 // I really need to rewrite Shaarli with a proper configuation manager.
 233
 234 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 235     // Ensure Shaarli has proper access to its resources
 236     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 237
 238     if ($errors != array()) {
 239         $message = '<p>Insufficient permissions:</p><ul>';
 240
 241         foreach ($errors as $error) {
 242             $message .= '<li>'.$error.'</li>';
 243         }
 244         $message .= '</ul>';
 245
 246         header('Content-Type: text/html; charset=utf-8');
 247         echo $message;
 248         exit;
 249     }
 250
 251     // Display the installation form if no existing config is found
 252     install();
 253 }
 254
 255 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 256 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 257 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 258
 259 // a token depending of deployment salt, user password, and the current ip
 260 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 261
 262 autoLocale(); // Sniff browser language and set date format accordingly.
 263 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 264
 265 //==================================================================================================
 266 // Checking session state (i.e. is the user still logged in)
 267 //==================================================================================================
 268
 269 function setup_login_state() {
 270         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 271             return true;
 272         }
 273         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 274         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 275         if (!isset($GLOBALS['login'])) {
 276             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 277             $loginFailure = true;
 278         }
 279         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 280             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 281             !$loginFailure)
 282         {
 283             fillSessionInfo();
 284             $userIsLoggedIn = true;
 285         }
 286         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 287         if (empty($_SESSION['uid']) ||
 288             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 289             time() >= $_SESSION['expires_on'])
 290         {
 291             logout();
 292             $userIsLoggedIn = false;
 293             $loginFailure = true;
 294         }
 295         if (!empty($_SESSION['longlastingsession'])) {
 296             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 297         }
 298         else {
 299             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 300         }
 301         if (!$loginFailure) {
 302             $userIsLoggedIn = true;
 303         }
 304
 305         return $userIsLoggedIn;
 306 }
 307 $userIsLoggedIn = setup_login_state();
 308
 309
 310 // -----------------------------------------------------------------------------------------------
 311 // Log to text file
 312 function logm($message)
 313 {
 314     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 315     file_put_contents($GLOBALS['config']['LOG_FILE'], $t, FILE_APPEND);
 316 }
 317
 318 // ------------------------------------------------------------------------------------------
 319 // Sniff browser language to display dates in the right format automatically.
 320 // (Note that is may not work on your server if the corresponding local is not installed.)
 321 function autoLocale()
 322 {
 323     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 324     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 325     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 326         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 327             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 328             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 329                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 330                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 331                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 332         }
 333     }
 334     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 335 }
 336
 337 // ------------------------------------------------------------------------------------------
 338 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 339 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 340 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 341 function pubsubhub()
 342 {
 343     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 344     {
 345        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 346        $topic_url = array (
 347                        index_url($_SERVER).'?do=atom',
 348                        index_url($_SERVER).'?do=rss'
 349                     );
 350        $p->publish_update($topic_url);
 351     }
 352 }
 353
 354 // ------------------------------------------------------------------------------------------
 355 // Session management
 356
 357 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 358 function allIPs()
 359 {
 360     $ip = $_SERVER["REMOTE_ADDR"];
 361     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 362     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 363     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 364     return $ip;
 365 }
 366
 367 function fillSessionInfo() {
 368         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 369         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 370         $_SESSION['username']=$GLOBALS['login'];
 371         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 372 }
 373
 374 // Check that user/password is correct.
 375 function check_auth($login,$password)
 376 {
 377     $hash = sha1($password.$login.$GLOBALS['salt']);
 378     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 379     {   // Login/password is correct.
 380                 fillSessionInfo();
 381         logm('Login successful');
 382         return True;
 383     }
 384     logm('Login failed for user '.$login);
 385     return False;
 386 }
 387
 388 // Returns true if the user is logged in.
 389 function isLoggedIn()
 390 {
 391     global $userIsLoggedIn;
 392     return $userIsLoggedIn;
 393 }
 394
 395 // Force logout.
 396 function logout() {
 397     if (isset($_SESSION)) {
 398         unset($_SESSION['uid']);
 399         unset($_SESSION['ip']);
 400         unset($_SESSION['username']);
 401         unset($_SESSION['privateonly']);
 402     }
 403     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 404 }
 405
 406
 407 // ------------------------------------------------------------------------------------------
 408 // Brute force protection system
 409 // Several consecutive failed logins will ban the IP address for 30 minutes.
 410 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?>");
 411 include $GLOBALS['config']['IPBANS_FILENAME'];
 412 // Signal a failed login. Will ban the IP if too many failures:
 413 function ban_loginFailed()
 414 {
 415     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 416     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 417     $gb['FAILURES'][$ip]++;
 418     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 419     {
 420         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 421         logm('IP address banned from login');
 422     }
 423     $GLOBALS['IPBANS'] = $gb;
 424     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 425 }
 426
 427 // Signals a successful login. Resets failed login counter.
 428 function ban_loginOk()
 429 {
 430     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 431     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 432     $GLOBALS['IPBANS'] = $gb;
 433     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 434 }
 435
 436 // Checks if the user CAN login. If 'true', the user can try to login.
 437 function ban_canLogin()
 438 {
 439     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 440     if (isset($gb['BANS'][$ip]))
 441     {
 442         // User is banned. Check if the ban has expired:
 443         if ($gb['BANS'][$ip]<=time())
 444         {   // Ban expired, user can try to login again.
 445             logm('Ban lifted.');
 446             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 447             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 448             return true; // Ban has expired, user can login.
 449         }
 450         return false; // User is banned.
 451     }
 452     return true; // User is not banned.
 453 }
 454
 455 // ------------------------------------------------------------------------------------------
 456 // Process login form: Check if login/password is correct.
 457 if (isset($_POST['login']))
 458 {
 459     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 460     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 461     {   // Login/password is OK.
 462         ban_loginOk();
 463         // If user wants to keep the session cookie even after the browser closes:
 464         if (!empty($_POST['longlastingsession']))
 465         {
 466                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 467             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 468             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 469
 470             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 471             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 472             // Note: Never forget the trailing slash on the cookie path!
 473             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 474         }
 475         else // Standard session expiration (=when browser closes)
 476         {
 477             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 478             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 479             session_regenerate_id(true);
 480         }
 481
 482         // Optional redirect after login:
 483         if (isset($_GET['post'])) {
 484             $uri = '?post='. urlencode($_GET['post']);
 485             foreach (array('description', 'source', 'title') as $param) {
 486                 if (!empty($_GET[$param])) {
 487                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 488                 }
 489             }
 490             header('Location: '. $uri);
 491             exit;
 492         }
 493
 494         if (isset($_GET['edit_link'])) {
 495             header('Location: ?edit_link='. escape($_GET['edit_link']));
 496             exit;
 497         }
 498
 499         if (isset($_POST['returnurl'])) {
 500             // Prevent loops over login screen.
 501             if (strpos($_POST['returnurl'], 'do=login') === false) {
 502                 header('Location: '. escape($_POST['returnurl']));
 503                 exit;
 504             }
 505         }
 506         header('Location: ?'); exit;
 507     }
 508     else
 509     {
 510         ban_loginFailed();
 511         $redir = '';
 512         if (isset($_GET['post'])) {
 513             $redir = '?post=' . urlencode($_GET['post']);
 514             foreach (array('description', 'source', 'title') as $param) {
 515                 if (!empty($_GET[$param])) {
 516                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 517                 }
 518             }
 519         }
 520         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 521         exit;
 522     }
 523 }
 524
 525 // ------------------------------------------------------------------------------------------
 526 // Misc utility functions:
 527
 528 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 529 function return_bytes($val)
 530 {
 531     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 532     switch($last)
 533     {
 534         case 'g': $val *= 1024;
 535         case 'm': $val *= 1024;
 536         case 'k': $val *= 1024;
 537     }
 538     return $val;
 539 }
 540
 541 // Try to determine max file size for uploads (POST).
 542 // Returns an integer (in bytes)
 543 function getMaxFileSize()
 544 {
 545     $size1 = return_bytes(ini_get('post_max_size'));
 546     $size2 = return_bytes(ini_get('upload_max_filesize'));
 547     // Return the smaller of two:
 548     $maxsize = min($size1,$size2);
 549     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 550     return $maxsize;
 551 }
 552
 553 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 554     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 555     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 556 function linkdate2timestamp($linkdate)
 557 {
 558     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 559         $Y=$M=$D=$h=$m=$s=0;
 560         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 561         return mktime($h,$m,$s,$M,$D,$Y);
 562     }
 563     return time();
 564 }
 565
 566 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 567     (used to build the pubDate attribute in RSS feed.)  */
 568 function linkdate2rfc822($linkdate)
 569 {
 570     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 571 }
 572
 573 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 574     (used to build the updated tags in ATOM feed.)  */
 575 function linkdate2iso8601($linkdate)
 576 {
 577     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 578 }
 579
 580 // Extract title from an HTML document.
 581 // (Returns an empty string if not found.)
 582 function html_extract_title($html)
 583 {
 584   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 585 }
 586
 587 // ------------------------------------------------------------------------------------------
 588 // Token management for XSRF protection
 589 // Token should be used in any form which acts on data (create,update,delete,import...).
 590 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 591
 592 // Returns a token.
 593 function getToken()
 594 {
 595     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 596     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 597     return $rnd;
 598 }
 599
 600 // Tells if a token is OK. Using this function will destroy the token.
 601 // true=token is OK.
 602 function tokenOk($token)
 603 {
 604     if (isset($_SESSION['tokens'][$token]))
 605     {
 606         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 607         return true; // Token is OK.
 608     }
 609     return false; // Wrong token, or already used.
 610 }
 611
 612 // ------------------------------------------------------------------------------------------
 613 /* This class is in charge of building the final page.
 614    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 615    p = new pageBuilder;
 616    p.assign('myfield','myvalue');
 617    p.renderPage('mytemplate');
 618
 619 */
 620 class pageBuilder
 621 {
 622     private $tpl; // RainTPL template
 623
 624     function __construct()
 625     {
 626         $this->tpl = false;
 627     }
 628
 629     /**
 630      * Initialize all default tpl tags.
 631      */
 632     private function initialize()
 633     {
 634         $this->tpl = new RainTPL;
 635
 636         try {
 637             $version = ApplicationUtils::checkUpdate(
 638                 shaarli_version,
 639                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 640                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 641                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 642                 isLoggedIn(),
 643                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 644             );
 645             $this->tpl->assign('newVersion', escape($version));
 646             $this->tpl->assign('versionError', '');
 647
 648         } catch (Exception $exc) {
 649             logm($exc->getMessage());
 650             $this->tpl->assign('newVersion', '');
 651             $this->tpl->assign('versionError', escape($exc->getMessage()));
 652         }
 653
 654         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 655         $searchcrits = ''; // Search criteria
 656         if (!empty($_GET['searchtags'])) {
 657             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 658         }
 659         elseif (!empty($_GET['searchterm'])) {
 660             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 661         }
 662         $this->tpl->assign('searchcrits', $searchcrits);
 663         $this->tpl->assign('source', index_url($_SERVER));
 664         $this->tpl->assign('version', shaarli_version);
 665         $this->tpl->assign('scripturl', index_url($_SERVER));
 666         $this->tpl->assign('pagetitle', 'Shaarli');
 667         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 668         if (!empty($GLOBALS['title'])) {
 669             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 670         }
 671         if (!empty($GLOBALS['titleLink'])) {
 672             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 673         }
 674         if (!empty($GLOBALS['pagetitle'])) {
 675             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 676         }
 677         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 678         if (!empty($GLOBALS['plugin_errors'])) {
 679             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 680         }
 681     }
 682
 683     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 684     public function assign($what,$where)
 685     {
 686         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 687         $this->tpl->assign($what,$where);
 688     }
 689
 690     // Render a specific page (using a template).
 691     // e.g. pb.renderPage('picwall')
 692     public function renderPage($page)
 693     {
 694         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 695         $this->tpl->draw($page);
 696     }
 697 }
 698
 699 // ------------------------------------------------------------------------------------------
 700 // Output the last N links in RSS 2.0 format.
 701 function showRSS()
 702 {
 703     header('Content-Type: application/rss+xml; charset=utf-8');
 704
 705     // $usepermalink : If true, use permalink instead of final link.
 706     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 707     // Also enabled through a config option
 708     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 709
 710     // Cache system
 711     $query = $_SERVER["QUERY_STRING"];
 712     $cache = new CachedPage(
 713         $GLOBALS['config']['PAGECACHE'],
 714         page_url($_SERVER),
 715         startsWith($query,'do=rss') && !isLoggedIn()
 716     );
 717     $cached = $cache->cachedVersion();
 718     if (! empty($cached)) {
 719         echo $cached;
 720         exit;
 721     }
 722
 723     // If cached was not found (or not usable), then read the database and build the response:
 724     $LINKSDB = new LinkDB(
 725         $GLOBALS['config']['DATASTORE'],
 726         isLoggedIn(),
 727         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 728         $GLOBALS['redirector']
 729     );
 730     // Read links from database (and filter private links if user it not logged in).
 731
 732     // Optionally filter the results:
 733     $linksToDisplay=array();
 734     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 735     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 736     else $linksToDisplay = $LINKSDB;
 737
 738     $nblinksToDisplay = 50;  // Number of links to display.
 739     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 740     {
 741         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 742     }
 743
 744     $pageaddr=escape(index_url($_SERVER));
 745     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 746     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 747     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 748     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 749     {
 750         echo '<!-- PubSubHubbub Discovery -->';
 751         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 752         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 753         echo '<!-- End Of PubSubHubbub Discovery -->';
 754     }
 755     $i=0;
 756     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 757     while ($i<$nblinksToDisplay && $i<count($keys))
 758     {
 759         $link = $linksToDisplay[$keys[$i]];
 760         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 761         $rfc822date = linkdate2rfc822($link['linkdate']);
 762         $absurl = $link['url'];
 763         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 764         if ($usepermalinks===true)
 765             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 766         else
 767             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 768         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 769         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 770         {
 771             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 772         }
 773
 774         // Add permalink in description
 775         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 776         // If user wants permalinks first, put the final link in description
 777         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 778         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 779         echo '<description><![CDATA['.
 780             format_description($link['description'], $GLOBALS['redirector']) .
 781             $descriptionlink . ']]></description>' . "\n</item>\n";
 782         $i++;
 783     }
 784     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 785
 786     $cache->cache(ob_get_contents());
 787     ob_end_flush();
 788     exit;
 789 }
 790
 791 // ------------------------------------------------------------------------------------------
 792 // Output the last N links in ATOM format.
 793 function showATOM()
 794 {
 795     header('Content-Type: application/atom+xml; charset=utf-8');
 796
 797     // $usepermalink : If true, use permalink instead of final link.
 798     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 799     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 800
 801     // Cache system
 802     $query = $_SERVER["QUERY_STRING"];
 803     $cache = new CachedPage(
 804         $GLOBALS['config']['PAGECACHE'],
 805         page_url($_SERVER),
 806         startsWith($query,'do=atom') && !isLoggedIn()
 807     );
 808     $cached = $cache->cachedVersion();
 809     if (!empty($cached)) {
 810         echo $cached;
 811         exit;
 812     }
 813
 814     // If cached was not found (or not usable), then read the database and build the response:
 815     // Read links from database (and filter private links if used it not logged in).
 816     $LINKSDB = new LinkDB(
 817         $GLOBALS['config']['DATASTORE'],
 818         isLoggedIn(),
 819         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 820         $GLOBALS['redirector']
 821     );
 822
 823     // Optionally filter the results:
 824     $linksToDisplay=array();
 825     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 826     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 827     else $linksToDisplay = $LINKSDB;
 828
 829     $nblinksToDisplay = 50;  // Number of links to display.
 830     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 831     {
 832         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 833     }
 834
 835     $pageaddr=escape(index_url($_SERVER));
 836     $latestDate = '';
 837     $entries='';
 838     $i=0;
 839     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 840     while ($i<$nblinksToDisplay && $i<count($keys))
 841     {
 842         $link = $linksToDisplay[$keys[$i]];
 843         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 844         $iso8601date = linkdate2iso8601($link['linkdate']);
 845         $latestDate = max($latestDate,$iso8601date);
 846         $absurl = $link['url'];
 847         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 848         $entries.='<entry><title>'.$link['title'].'</title>';
 849         if ($usepermalinks===true)
 850             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 851         else
 852             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 853         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 854
 855         // Add permalink in description
 856         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 857         // If user wants permalinks first, put the final link in description
 858         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 859         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 860
 861         $entries .= '<content type="html"><![CDATA['.
 862             format_description($link['description'], $GLOBALS['redirector']) .
 863             $descriptionlink . "]]></content>\n";
 864         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 865         {
 866             foreach(explode(' ',$link['tags']) as $tag)
 867                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 868         }
 869         $entries.="</entry>\n";
 870         $i++;
 871     }
 872     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 873     $feed.='<title>'.$GLOBALS['title'].'</title>';
 874     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 875     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 876     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 877     {
 878         $feed.='<!-- PubSubHubbub Discovery -->';
 879         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 880         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 881     }
 882     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 883     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 884     $feed.=$entries;
 885     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 886     echo $feed;
 887
 888     $cache->cache(ob_get_contents());
 889     ob_end_flush();
 890     exit;
 891 }
 892
 893 // ------------------------------------------------------------------------------------------
 894 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 895 // Gives the last 7 days (which have links).
 896 // This RSS feed cannot be filtered.
 897 function showDailyRSS() {
 898     // Cache system
 899     $query = $_SERVER["QUERY_STRING"];
 900     $cache = new CachedPage(
 901         $GLOBALS['config']['PAGECACHE'],
 902         page_url($_SERVER),
 903         startsWith($query,'do=dailyrss') && !isLoggedIn()
 904     );
 905     $cached = $cache->cachedVersion();
 906     if (!empty($cached)) {
 907         echo $cached;
 908         exit;
 909     }
 910
 911     // If cached was not found (or not usable), then read the database and build the response:
 912     // Read links from database (and filter private links if used it not logged in).
 913     $LINKSDB = new LinkDB(
 914         $GLOBALS['config']['DATASTORE'],
 915         isLoggedIn(),
 916         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 917         $GLOBALS['redirector']
 918     );
 919
 920     /* Some Shaarlies may have very few links, so we need to look
 921        back in time (rsort()) until we have enough days ($nb_of_days).
 922     */
 923     $linkdates = array();
 924     foreach ($LINKSDB as $linkdate => $value) {
 925         $linkdates[] = $linkdate;
 926     }
 927     rsort($linkdates);
 928     $nb_of_days = 7; // We take 7 days.
 929     $today = Date('Ymd');
 930     $days = array();
 931
 932     foreach ($linkdates as $linkdate) {
 933         $day = substr($linkdate, 0, 8); // Extract day (without time)
 934         if (strcmp($day,$today) < 0) {
 935             if (empty($days[$day])) {
 936                 $days[$day] = array();
 937             }
 938             $days[$day][] = $linkdate;
 939         }
 940
 941         if (count($days) > $nb_of_days) {
 942             break; // Have we collected enough days?
 943         }
 944     }
 945
 946     // Build the RSS feed.
 947     header('Content-Type: application/rss+xml; charset=utf-8');
 948     $pageaddr = escape(index_url($_SERVER));
 949     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 950     echo '<channel>';
 951     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 952     echo '<link>'. $pageaddr .'</link>';
 953     echo '<description>Daily shared links</description>';
 954     echo '<language>en-en</language>';
 955     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 956
 957     // For each day.
 958     foreach ($days as $day => $linkdates) {
 959         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 960         $rfc822date = linkdate2rfc822($day.'_000000');
 961         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 962
 963         // Build the HTML body of this RSS entry.
 964         $html = '';
 965         $href = '';
 966         $links = array();
 967
 968         // We pre-format some fields for proper output.
 969         foreach ($linkdates as $linkdate) {
 970             $l = $LINKSDB[$linkdate];
 971             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 972             $l['thumbnail'] = thumbnail($l['url']);
 973             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 974             if (startsWith($l['url'], '?')) {
 975                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 976             }
 977             $links[$linkdate] = $l;
 978         }
 979
 980         // Then build the HTML for this day:
 981         $tpl = new RainTPL;
 982         $tpl->assign('title', $GLOBALS['title']);
 983         $tpl->assign('daydate', $daydate);
 984         $tpl->assign('absurl', $absurl);
 985         $tpl->assign('links', $links);
 986         $tpl->assign('rfc822date', escape($rfc822date));
 987         $html = $tpl->draw('dailyrss', $return_string=true);
 988
 989         echo $html . PHP_EOL;
 990     }
 991     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 992
 993     $cache->cache(ob_get_contents());
 994     ob_end_flush();
 995     exit;
 996 }
 997
 998 /**
 999  * Show the 'Daily' page.
1000  *
1001  * @param PageBuilder $pageBuilder Template engine wrapper.
1002  */
1003 function showDaily($pageBuilder)
1004 {
1005     $LINKSDB = new LinkDB(
1006         $GLOBALS['config']['DATASTORE'],
1007         isLoggedIn(),
1008         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1009         $GLOBALS['redirector']
1010     );
1011
1012     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1013     if (isset($_GET['day'])) $day=$_GET['day'];
1014
1015     $days = $LINKSDB->days();
1016     $i = array_search($day,$days);
1017     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1018     $previousday='';
1019     $nextday='';
1020     if ($i!==false)
1021     {
1022         if ($i>=1) $previousday=$days[$i-1];
1023         if ($i<count($days)-1) $nextday=$days[$i+1];
1024     }
1025
1026     try {
1027         $linksToDisplay = $LINKSDB->filterDay($day);
1028     } catch (Exception $exc) {
1029         error_log($exc);
1030         $linksToDisplay = array();
1031     }
1032
1033     // We pre-format some fields for proper output.
1034     foreach($linksToDisplay as $key=>$link)
1035     {
1036
1037         $taglist = explode(' ',$link['tags']);
1038         uasort($taglist, 'strcasecmp');
1039         $linksToDisplay[$key]['taglist']=$taglist;
1040         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
1041         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1042         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1043     }
1044
1045     /* We need to spread the articles on 3 columns.
1046        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1047        so I manually spread entries with a simple method: I roughly evaluate the
1048        height of a div according to title and description length.
1049     */
1050     $columns=array(array(),array(),array()); // Entries to display, for each column.
1051     $fill=array(0,0,0);  // Rough estimate of columns fill.
1052     foreach($linksToDisplay as $key=>$link)
1053     {
1054         // Roughly estimate length of entry (by counting characters)
1055         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1056         // Description: 836 characters gives roughly 342 pixel height.
1057         // This is not perfect, but it's usually OK.
1058         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1059         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1060         // Then put in column which is the less filled:
1061         $smallest=min($fill); // find smallest value in array.
1062         $index=array_search($smallest,$fill); // find index of this smallest value.
1063         array_push($columns[$index],$link); // Put entry in this column.
1064         $fill[$index]+=$length;
1065     }
1066
1067     $data = array(
1068         'linksToDisplay' => $linksToDisplay,
1069         'linkcount' => count($LINKSDB),
1070         'cols' => $columns,
1071         'day' => linkdate2timestamp($day.'_000000'),
1072         'previousday' => $previousday,
1073         'nextday' => $nextday,
1074     );
1075     $pluginManager = PluginManager::getInstance();
1076     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1077
1078     foreach ($data as $key => $value) {
1079         $pageBuilder->assign($key, $value);
1080     }
1081
1082     $pageBuilder->renderPage('daily');
1083     exit;
1084 }
1085
1086 // Renders the linklist
1087 function showLinkList($PAGE, $LINKSDB) {
1088     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1089     $PAGE->renderPage('linklist');
1090 }
1091
1092
1093 // ------------------------------------------------------------------------------------------
1094 // Render HTML page (according to URL parameters and user rights)
1095 function renderPage()
1096 {
1097     $LINKSDB = new LinkDB(
1098         $GLOBALS['config']['DATASTORE'],
1099         isLoggedIn(),
1100         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1101         $GLOBALS['redirector']
1102     );
1103
1104     $PAGE = new pageBuilder;
1105
1106     // Determine which page will be rendered.
1107     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1108     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1109
1110     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1111     // Then assign generated data to RainTPL.
1112     $common_hooks = array(
1113         'header',
1114         'footer',
1115         'includes',
1116     );
1117     $pluginManager = PluginManager::getInstance();
1118     foreach($common_hooks as $name) {
1119         $plugin_data = array();
1120         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1121             array(
1122                 'target' => $targetPage,
1123                 'loggedin' => isLoggedIn()
1124             )
1125         );
1126         $PAGE->assign('plugins_' . $name, $plugin_data);
1127     }
1128
1129     // -------- Display login form.
1130     if ($targetPage == Router::$PAGE_LOGIN)
1131     {
1132         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1133         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1134         $PAGE->assign('token',$token);
1135         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1136         $PAGE->renderPage('loginform');
1137         exit;
1138     }
1139     // -------- User wants to logout.
1140     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1141     {
1142         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1143         logout();
1144         header('Location: ?');
1145         exit;
1146     }
1147
1148     // -------- Picture wall
1149     if ($targetPage == Router::$PAGE_PICWALL)
1150     {
1151         // Optionally filter the results:
1152         $links=array();
1153         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1154         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1155         else $links = $LINKSDB;
1156
1157         $body='';
1158         $linksToDisplay=array();
1159
1160         // Get only links which have a thumbnail.
1161         foreach($links as $link)
1162         {
1163             $permalink='?'.escape(smallhash($link['linkdate']));
1164             $thumb=lazyThumbnail($link['url'],$permalink);
1165             if ($thumb!='') // Only output links which have a thumbnail.
1166             {
1167                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1168                 $linksToDisplay[]=$link; // Add to array.
1169             }
1170         }
1171
1172         $data = array(
1173             'linkcount' => count($LINKSDB),
1174             'linksToDisplay' => $linksToDisplay,
1175         );
1176         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1177
1178         foreach ($data as $key => $value) {
1179             $PAGE->assign($key, $value);
1180         }
1181
1182         $PAGE->renderPage('picwall');
1183         exit;
1184     }
1185
1186     // -------- Tag cloud
1187     if ($targetPage == Router::$PAGE_TAGCLOUD)
1188     {
1189         $tags= $LINKSDB->allTags();
1190
1191         // We sort tags alphabetically, then choose a font size according to count.
1192         // First, find max value.
1193         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1194         ksort($tags);
1195         $tagList=array();
1196         foreach($tags as $key=>$value)
1197         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1198         {
1199             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1200         }
1201
1202         $data = array(
1203             'linkcount' => count($LINKSDB),
1204             'tags' => $tagList,
1205         );
1206         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1207
1208         foreach ($data as $key => $value) {
1209             $PAGE->assign($key, $value);
1210         }
1211
1212         $PAGE->renderPage('tagcloud');
1213         exit;
1214     }
1215
1216     // Daily page.
1217     if ($targetPage == Router::$PAGE_DAILY) {
1218         showDaily($PAGE);
1219     }
1220
1221     // Display openseach plugin (XML)
1222     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1223         header('Content-Type: application/xml; charset=utf-8');
1224         $PAGE->assign('serverurl', index_url($_SERVER));
1225         $PAGE->renderPage('opensearch');
1226         exit;
1227     }
1228
1229     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1230     if (isset($_GET['addtag']))
1231     {
1232         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1233         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1234         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1235
1236         // Prevent redirection loop
1237         if (isset($params['addtag'])) {
1238             unset($params['addtag']);
1239         }
1240
1241         // Check if this tag is already in the search query and ignore it if it is.
1242         // Each tag is always separated by a space
1243         if (isset($params['searchtags'])) {
1244             $current_tags = explode(' ', $params['searchtags']);
1245         } else {
1246             $current_tags = array();
1247         }
1248         $addtag = true;
1249         foreach ($current_tags as $value) {
1250             if ($value === $_GET['addtag']) {
1251                 $addtag = false;
1252                 break;
1253             }
1254         }
1255         // Append the tag if necessary
1256         if (empty($params['searchtags'])) {
1257             $params['searchtags'] = trim($_GET['addtag']);
1258         }
1259         else if ($addtag) {
1260             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1261         }
1262
1263         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1264         header('Location: ?'.http_build_query($params));
1265         exit;
1266     }
1267
1268     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1269     if (isset($_GET['removetag'])) {
1270         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1271         if (empty($_SERVER['HTTP_REFERER'])) {
1272             header('Location: ?');
1273             exit;
1274         }
1275
1276         // In case browser does not send HTTP_REFERER
1277         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1278
1279         // Prevent redirection loop
1280         if (isset($params['removetag'])) {
1281             unset($params['removetag']);
1282         }
1283
1284         if (isset($params['searchtags'])) {
1285             $tags = explode(' ',$params['searchtags']);
1286             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1287             if (count($tags)==0) {
1288                 unset($params['searchtags']);
1289             } else {
1290                 $params['searchtags'] = implode(' ',$tags);
1291             }
1292             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1293         }
1294         header('Location: ?'.http_build_query($params));
1295         exit;
1296     }
1297
1298     // -------- User wants to change the number of links per page (linksperpage=...)
1299     if (isset($_GET['linksperpage'])) {
1300         if (is_numeric($_GET['linksperpage'])) {
1301             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1302         }
1303
1304         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1305         exit;
1306     }
1307
1308     // -------- User wants to see only private links (toggle)
1309     if (isset($_GET['privateonly'])) {
1310         if (empty($_SESSION['privateonly'])) {
1311             $_SESSION['privateonly'] = 1; // See only private links
1312         } else {
1313             unset($_SESSION['privateonly']); // See all links
1314         }
1315
1316         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1317         exit;
1318     }
1319
1320     // -------- Handle other actions allowed for non-logged in users:
1321     if (!isLoggedIn())
1322     {
1323         // User tries to post new link but is not logged in:
1324         // Show login screen, then redirect to ?post=...
1325         if (isset($_GET['post']))
1326         {
1327             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1328             exit;
1329         }
1330
1331                 // Same case as above except that user tried to access ?do=addlink without being logged in
1332                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1333                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1334                         header('Location: ?do=login&post=');
1335                         exit;
1336                 }
1337         showLinkList($PAGE, $LINKSDB);
1338         if (isset($_GET['edit_link'])) {
1339             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1340             exit;
1341         }
1342
1343         exit; // Never remove this one! All operations below are reserved for logged in user.
1344     }
1345
1346     // -------- All other functions are reserved for the registered user:
1347
1348     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1349     if ($targetPage == Router::$PAGE_TOOLS)
1350     {
1351         $data = array(
1352             'linkcount' => count($LINKSDB),
1353             'pageabsaddr' => index_url($_SERVER),
1354         );
1355         $pluginManager->executeHooks('render_tools', $data);
1356
1357         foreach ($data as $key => $value) {
1358             $PAGE->assign($key, $value);
1359         }
1360
1361         $PAGE->renderPage('tools');
1362         exit;
1363     }
1364
1365     // -------- User wants to change his/her password.
1366     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1367     {
1368         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1369         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1370         {
1371             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1372
1373             // Make sure old password is correct.
1374             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1375             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1376             // Save new password
1377             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1378             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1379             try {
1380                 writeConfig($GLOBALS, isLoggedIn());
1381             }
1382             catch(Exception $e) {
1383                 error_log(
1384                     'ERROR while writing config file after changing password.' . PHP_EOL .
1385                     $e->getMessage()
1386                 );
1387
1388                 // TODO: do not handle exceptions/errors in JS.
1389                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1390                 exit;
1391             }
1392             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1393             exit;
1394         }
1395         else // show the change password form.
1396         {
1397             $PAGE->assign('linkcount',count($LINKSDB));
1398             $PAGE->assign('token',getToken());
1399             $PAGE->renderPage('changepassword');
1400             exit;
1401         }
1402     }
1403
1404     // -------- User wants to change configuration
1405     if ($targetPage == Router::$PAGE_CONFIGURE)
1406     {
1407         if (!empty($_POST['title']) )
1408         {
1409             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1410             $tz = 'UTC';
1411             if (!empty($_POST['continent']) && !empty($_POST['city']))
1412                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1413                     $tz = $_POST['continent'].'/'.$_POST['city'];
1414             $GLOBALS['timezone'] = $tz;
1415             $GLOBALS['title']=$_POST['title'];
1416             $GLOBALS['titleLink']=$_POST['titleLink'];
1417             $GLOBALS['redirector']=$_POST['redirector'];
1418             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1419             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1420             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1421             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1422             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1423             try {
1424                 writeConfig($GLOBALS, isLoggedIn());
1425             }
1426             catch(Exception $e) {
1427                 error_log(
1428                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1429                     $e->getMessage()
1430                 );
1431
1432                 // TODO: do not handle exceptions/errors in JS.
1433                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1434                 exit;
1435             }
1436             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1437             exit;
1438         }
1439         else // Show the configuration form.
1440         {
1441             $PAGE->assign('linkcount',count($LINKSDB));
1442             $PAGE->assign('token',getToken());
1443             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1444             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1445             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1446             $PAGE->assign('timezone_form', $timezone_form);
1447             $PAGE->assign('timezone_js',$timezone_js);
1448             $PAGE->renderPage('configure');
1449             exit;
1450         }
1451     }
1452
1453     // -------- User wants to rename a tag or delete it
1454     if ($targetPage == Router::$PAGE_CHANGETAG)
1455     {
1456         if (empty($_POST['fromtag']))
1457         {
1458             $PAGE->assign('linkcount',count($LINKSDB));
1459             $PAGE->assign('token',getToken());
1460             $PAGE->assign('tags', $LINKSDB->allTags());
1461             $PAGE->renderPage('changetag');
1462             exit;
1463         }
1464         if (!tokenOk($_POST['token'])) die('Wrong token.');
1465
1466         // Delete a tag:
1467         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1468         {
1469             $needle=trim($_POST['fromtag']);
1470             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1471             foreach($linksToAlter as $key=>$value)
1472             {
1473                 $tags = explode(' ',trim($value['tags']));
1474                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1475                 $value['tags']=trim(implode(' ',$tags));
1476                 $LINKSDB[$key]=$value;
1477             }
1478             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1479             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1480             exit;
1481         }
1482
1483         // Rename a tag:
1484         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1485         {
1486             $needle=trim($_POST['fromtag']);
1487             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1488             foreach($linksToAlter as $key=>$value)
1489             {
1490                 $tags = explode(' ',trim($value['tags']));
1491                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1492                 $value['tags']=trim(implode(' ',$tags));
1493                 $LINKSDB[$key]=$value;
1494             }
1495             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1496             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1497             exit;
1498         }
1499     }
1500
1501     // -------- User wants to add a link without using the bookmarklet: Show form.
1502     if ($targetPage == Router::$PAGE_ADDLINK)
1503     {
1504         $PAGE->assign('linkcount',count($LINKSDB));
1505         $PAGE->renderPage('addlink');
1506         exit;
1507     }
1508
1509     // -------- User clicked the "Save" button when editing a link: Save link to database.
1510     if (isset($_POST['save_edit']))
1511     {
1512         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1513         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1514         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1515         $linkdate=$_POST['lf_linkdate'];
1516         $url = trim($_POST['lf_url']);
1517         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1518             $url = 'http://'.$url;
1519         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1520                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1521         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1522
1523         $pluginManager->executeHooks('save_link', $link);
1524
1525         $LINKSDB[$linkdate] = $link;
1526         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1527         pubsubhub();
1528
1529         // If we are called from the bookmarklet, we must close the popup:
1530         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1531             echo '<script>self.close();</script>';
1532             exit;
1533         }
1534
1535         $returnurl = !empty($_POST['returnurl']) ? escape($_POST['returnurl']): '?';
1536         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1537         $location .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1538         header('Location: '. $location); // After saving the link, redirect to the page the user was on.
1539         exit;
1540     }
1541
1542     // -------- User clicked the "Cancel" button when editing a link.
1543     if (isset($_POST['cancel_edit']))
1544     {
1545         // If we are called from the bookmarklet, we must close the popup:
1546         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1547         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1548         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1549         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1550         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1551         exit;
1552     }
1553
1554     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1555     if (isset($_POST['delete_link']))
1556     {
1557         if (!tokenOk($_POST['token'])) die('Wrong token.');
1558         // We do not need to ask for confirmation:
1559         // - confirmation is handled by JavaScript
1560         // - we are protected from XSRF by the token.
1561         $linkdate=$_POST['lf_linkdate'];
1562
1563         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1564
1565         unset($LINKSDB[$linkdate]);
1566         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1567
1568         // If we are called from the bookmarklet, we must close the popup:
1569         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1570         // Pick where we're going to redirect
1571         // =============================================================
1572         // Basically, we can't redirect to where we were previously if it was a permalink
1573         // or an edit_link, because it would 404.
1574         // Cases:
1575         //    - /             : nothing in $_GET, redirect to self
1576         //    - /?page        : redirect to self
1577         //    - /?searchterm  : redirect to self (there might be other links)
1578         //    - /?searchtags  : redirect to self
1579         //    - /permalink    : redirect to / (the link does not exist anymore)
1580         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1581         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1582         // redirect is not satisfied, and only then redirect to /
1583         $location = "?";
1584         // Self redirection
1585         if (count($_GET) == 0
1586             || isset($_GET['page'])
1587             || isset($_GET['searchterm'])
1588             || isset($_GET['searchtags'])
1589         ) {
1590             if (isset($_POST['returnurl'])) {
1591                 $location = $_POST['returnurl']; // Handle redirects given by the form
1592             } else {
1593                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1594             }
1595         }
1596
1597         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1598         exit;
1599     }
1600
1601     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1602     if (isset($_GET['edit_link']))
1603     {
1604         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1605         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1606         $data = array(
1607             'linkcount' => count($LINKSDB),
1608             'link' => $link,
1609             'link_is_new' => false,
1610             'token' => getToken(),
1611             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1612             'tags' => $LINKSDB->allTags(),
1613         );
1614         $pluginManager->executeHooks('render_editlink', $data);
1615
1616         foreach ($data as $key => $value) {
1617             $PAGE->assign($key, $value);
1618         }
1619
1620         $PAGE->renderPage('editlink');
1621         exit;
1622     }
1623
1624     // -------- User want to post a new link: Display link edit form.
1625     if (isset($_GET['post'])) {
1626         $url = cleanup_url($_GET['post']);
1627
1628         $link_is_new = false;
1629         // Check if URL is not already in database (in this case, we will edit the existing link)
1630         $link = $LINKSDB->getLinkFromUrl($url);
1631         if (!$link)
1632         {
1633             $link_is_new = true;
1634             $linkdate = strval(date('Ymd_His'));
1635             // Get title if it was provided in URL (by the bookmarklet).
1636             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1637             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1638             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1639             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1640             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1641             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1642             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1643                 // Short timeout to keep the application responsive
1644                 list($headers, $data) = get_http_url($url, 4);
1645                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1646                 if (strpos($headers[0], '200 OK') !== false) {
1647                     // Look for charset in html header.
1648                     preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1649
1650                     // If found, extract encoding.
1651                     if (!empty($meta[0])) {
1652                         // Get encoding specified in header.
1653                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1654                         // If charset not found, use utf-8.
1655                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1656                     }
1657                     else {
1658                         $html_charset = 'utf-8';
1659                     }
1660
1661                     // Extract title
1662                     $title = html_extract_title($data);
1663                     if (!empty($title)) {
1664                         // Re-encode title in utf-8 if necessary.
1665                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1666                     }
1667                 }
1668             }
1669             if ($url == '') {
1670                 $url = '?' . smallHash($linkdate);
1671                 $title = 'Note: ';
1672             }
1673             $link = array(
1674                 'linkdate' => $linkdate,
1675                 'title' => $title,
1676                 'url' => $url,
1677                 'description' => $description,
1678                 'tags' => $tags,
1679                 'private' => $private
1680             );
1681         }
1682
1683         $data = array(
1684             'linkcount' => count($LINKSDB),
1685             'link' => $link,
1686             'link_is_new' => $link_is_new,
1687             'token' => getToken(), // XSRF protection.
1688             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1689             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1690             'tags' => $LINKSDB->allTags(),
1691         );
1692         $pluginManager->executeHooks('render_editlink', $data);
1693
1694         foreach ($data as $key => $value) {
1695             $PAGE->assign($key, $value);
1696         }
1697
1698         $PAGE->renderPage('editlink');
1699         exit;
1700     }
1701
1702     // -------- Export as Netscape Bookmarks HTML file.
1703     if ($targetPage == Router::$PAGE_EXPORT)
1704     {
1705         if (empty($_GET['what']))
1706         {
1707             $PAGE->assign('linkcount',count($LINKSDB));
1708             $PAGE->renderPage('export');
1709             exit;
1710         }
1711         $exportWhat=$_GET['what'];
1712         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1713
1714         header('Content-Type: text/html; charset=utf-8');
1715         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1716         $currentdate=date('Y/m/d H:i:s');
1717         echo <<<HTML
1718 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1719 <!-- This is an automatically generated file.
1720      It will be read and overwritten.
1721      DO NOT EDIT! -->
1722 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1723 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1724 <TITLE>Bookmarks</TITLE>
1725 <H1>Bookmarks</H1>
1726 HTML;
1727         foreach($LINKSDB as $link)
1728         {
1729             if ($exportWhat=='all' ||
1730                ($exportWhat=='private' && $link['private']!=0) ||
1731                ($exportWhat=='public' && $link['private']==0))
1732             {
1733                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1734                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1735                 echo '>'.$link['title']."</A>\n";
1736                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1737             }
1738         }
1739                 exit;
1740     }
1741
1742     // -------- User is uploading a file for import
1743     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1744     {
1745         // If file is too big, some form field may be missing.
1746         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1747         {
1748             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1749             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1750             exit;
1751         }
1752         if (!tokenOk($_POST['token'])) die('Wrong token.');
1753         importFile();
1754         exit;
1755     }
1756
1757     // -------- Show upload/import dialog:
1758     if ($targetPage == Router::$PAGE_IMPORT)
1759     {
1760         $PAGE->assign('linkcount',count($LINKSDB));
1761         $PAGE->assign('token',getToken());
1762         $PAGE->assign('maxfilesize',getMaxFileSize());
1763         $PAGE->renderPage('import');
1764         exit;
1765     }
1766
1767     // -------- Otherwise, simply display search form and links:
1768     showLinkList($PAGE, $LINKSDB);
1769     exit;
1770 }
1771
1772 // -----------------------------------------------------------------------------------------------
1773 // Process the import file form.
1774 function importFile()
1775 {
1776     if (!isLoggedIn()) { die('Not allowed.'); }
1777     $LINKSDB = new LinkDB(
1778         $GLOBALS['config']['DATASTORE'],
1779         isLoggedIn(),
1780         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1781         $GLOBALS['redirector']
1782     );
1783     $filename=$_FILES['filetoupload']['name'];
1784     $filesize=$_FILES['filetoupload']['size'];
1785     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1786     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1787     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1788     $import_count=0;
1789
1790     // Sniff file type:
1791     $type='unknown';
1792     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1793
1794     // Then import the bookmarks.
1795     if ($type=='netscape')
1796     {
1797         // This is a standard Netscape-style bookmark file.
1798         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1799         foreach(explode('<DT>',$data) as $html) // explode is very fast
1800         {
1801             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1802             $d = explode('<DD>',$html);
1803             if (startswith($d[0],'<A '))
1804             {
1805                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1806                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1807                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1808                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1809                 $raw_add_date=0;
1810                 foreach($matches as $m)
1811                 {
1812                     $attr=$m[1]; $value=$m[2];
1813                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1814                     elseif ($attr=='ADD_DATE')
1815                     {
1816                         $raw_add_date=intval($value);
1817                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1818                     }
1819                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1820                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1821                 }
1822                 if ($link['url']!='')
1823                 {
1824                     if ($private==1) $link['private']=1;
1825                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1826                     if ($dblink==false)
1827                     {  // Link not in database, let's import it...
1828                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1829
1830                        // Make sure date/time is not already used by another link.
1831                        // (Some bookmark files have several different links with the same ADD_DATE)
1832                        // We increment date by 1 second until we find a date which is not used in DB.
1833                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1834                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1835                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1836                        $LINKSDB[$link['linkdate']] = $link;
1837                        $import_count++;
1838                     }
1839                     else // Link already present in database.
1840                     {
1841                         if ($overwrite)
1842                         {   // If overwrite is required, we import link data, except date/time.
1843                             $link['linkdate']=$dblink['linkdate'];
1844                             $LINKSDB[$link['linkdate']] = $link;
1845                             $import_count++;
1846                         }
1847                     }
1848
1849                 }
1850             }
1851         }
1852         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1853
1854         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1855     }
1856     else
1857     {
1858         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1859     }
1860 }
1861
1862 // -----------------------------------------------------------------------------------------------
1863 // Template for the list of links (<div id="linklist">)
1864 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1865 function buildLinkList($PAGE,$LINKSDB)
1866 {
1867     // ---- Filter link database according to parameters
1868     $linksToDisplay=array();
1869     $search_type='';
1870     $search_crits='';
1871     if (isset($_GET['searchterm'])) // Fulltext search
1872     {
1873         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1874         $search_crits=escape(trim($_GET['searchterm']));
1875         $search_type='fulltext';
1876     }
1877     elseif (isset($_GET['searchtags'])) // Search by tag
1878     {
1879         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1880         $search_crits=explode(' ',escape(trim($_GET['searchtags'])));
1881         $search_type='tags';
1882     }
1883     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1884     {
1885         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1886         if (count($linksToDisplay)==0)
1887         {
1888             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1889             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1890             echo '<br>Would you mind <a href="?">clicking here</a>?';
1891             exit;
1892         }
1893         $search_type='permalink';
1894     }
1895     else
1896         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1897
1898
1899     // Option: Show only private links
1900     if (!empty($_SESSION['privateonly']))
1901     {
1902         $tmp = array();
1903         foreach($linksToDisplay as $linkdate=>$link)
1904         {
1905             if ($link['private']!=0) $tmp[$linkdate]=$link;
1906         }
1907         $linksToDisplay=$tmp;
1908     }
1909
1910     // ---- Handle paging.
1911     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1912        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1913        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1914     */
1915     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1916
1917     // If there is only a single link, we change on-the-fly the title of the page.
1918     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1919
1920     // Select articles according to paging.
1921     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1922     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1923     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1924     $page = ( $page<1 ? 1 : $page );
1925     $page = ( $page>$pagecount ? $pagecount : $page );
1926     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1927     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1928     $linkDisp=array(); // Links to display
1929     while ($i<$end && $i<count($keys))
1930     {
1931         $link = $linksToDisplay[$keys[$i]];
1932         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1933         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1934         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1935         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1936         $taglist = explode(' ',$link['tags']);
1937         uasort($taglist, 'strcasecmp');
1938         $link['taglist']=$taglist;
1939         $link['shorturl'] = smallHash($link['linkdate']);
1940         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1941             strlen($link["url"]) === 7) {
1942             $link["url"] = index_url($_SERVER) . $link["url"];
1943         }
1944
1945         $linkDisp[$keys[$i]] = $link;
1946         $i++;
1947     }
1948
1949     // Compute paging navigation
1950     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1951     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1952     $paging='';
1953     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1954     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1955
1956     $token = ''; if (isLoggedIn()) $token=getToken();
1957
1958     // Fill all template fields.
1959     $data = array(
1960         'linkcount' => count($LINKSDB),
1961         'previous_page_url' => $previous_page_url,
1962         'next_page_url' => $next_page_url,
1963         'page_current' => $page,
1964         'page_max' => $pagecount,
1965         'result_count' => count($linksToDisplay),
1966         'search_type' => $search_type,
1967         'search_crits' => $search_crits,
1968         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
1969         'token' => $token,
1970         'links' => $linkDisp,
1971         'tags' => $LINKSDB->allTags(),
1972     );
1973     // FIXME! temporary fix - see #399.
1974     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
1975         $data['pagetitle'] = $GLOBALS['pagetitle'];
1976     }
1977
1978     $pluginManager = PluginManager::getInstance();
1979     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1980
1981     foreach ($data as $key => $value) {
1982         $PAGE->assign($key, $value);
1983     }
1984
1985     return;
1986 }
1987
1988 // Compute the thumbnail for a link.
1989 //
1990 // With a link to the original URL.
1991 // Understands various services (youtube.com...)
1992 // Input: $url = URL for which the thumbnail must be found.
1993 //        $href = if provided, this URL will be followed instead of $url
1994 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1995 // Some of them may be missing.
1996 // Return an empty array if no thumbnail available.
1997 function computeThumbnail($url,$href=false)
1998 {
1999     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
2000     if ($href==false) $href=$url;
2001
2002     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
2003     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
2004     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
2005     $domain = parse_url($url,PHP_URL_HOST);
2006     if ($domain=='youtube.com' || $domain=='www.youtube.com')
2007     {
2008         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
2009         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
2010                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2011     }
2012     if ($domain=='youtu.be') // Youtube short links
2013     {
2014         $path = parse_url($url,PHP_URL_PATH);
2015         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
2016                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2017     }
2018     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
2019     {
2020         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2021         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2022                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2023     }
2024
2025     if ($domain=='imgur.com')
2026     {
2027         $path = parse_url($url,PHP_URL_PATH);
2028         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2029         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2030                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2031         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2032                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2033
2034         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2035                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2036     }
2037     if ($domain=='i.imgur.com')
2038     {
2039         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2040         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2041                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2042     }
2043     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2044     {
2045         if (strpos($url,'dailymotion.com/video/')!==false)
2046         {
2047             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2048             return array('src'=>$thumburl,
2049                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2050         }
2051     }
2052     if (endsWith($domain,'.imageshack.us'))
2053     {
2054         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2055         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2056         {
2057             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2058             return array('src'=>$thumburl,
2059                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2060         }
2061     }
2062
2063     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2064     // So we deport the thumbnail generation in order not to slow down page generation
2065     // (and we also cache the thumbnail)
2066
2067     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2068
2069     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2070         || $domain=='vimeo.com'
2071         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2072         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2073     )
2074     {
2075         if ($domain=='vimeo.com')
2076         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2077             $path = parse_url($url,PHP_URL_PATH);
2078             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2079         }
2080         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2081         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2082             $path = parse_url($url,PHP_URL_PATH);
2083             if (!preg_match('!/\d+.+?!',$path)) return array();
2084         }
2085         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2086         {   // Make sure this TED URL points to a video (/talks/...)
2087             $path = parse_url($url,PHP_URL_PATH);
2088             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2089         }
2090         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2091         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2092                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2093     }
2094
2095     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2096     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2097     // But using the extension will do.
2098     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2099     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2100     {
2101         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2102         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2103                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2104     }
2105     return array(); // No thumbnail.
2106
2107 }
2108
2109
2110 // Returns the HTML code to display a thumbnail for a link
2111 // with a link to the original URL.
2112 // Understands various services (youtube.com...)
2113 // Input: $url = URL for which the thumbnail must be found.
2114 //        $href = if provided, this URL will be followed instead of $url
2115 // Returns '' if no thumbnail available.
2116 function thumbnail($url,$href=false)
2117 {
2118     $t = computeThumbnail($url,$href);
2119     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2120
2121     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2122     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2123     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2124     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2125     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2126     $html.='></a>';
2127     return $html;
2128 }
2129
2130 // Returns the HTML code to display a thumbnail for a link
2131 // for the picture wall (using lazy image loading)
2132 // Understands various services (youtube.com...)
2133 // Input: $url = URL for which the thumbnail must be found.
2134 //        $href = if provided, this URL will be followed instead of $url
2135 // Returns '' if no thumbnail available.
2136 function lazyThumbnail($url,$href=false)
2137 {
2138     $t = computeThumbnail($url,$href);
2139     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2140
2141     $html='<a href="'.escape($t['href']).'">';
2142
2143     // Lazy image
2144     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2145
2146     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2147     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2148     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2149     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2150     $html.='>';
2151
2152     // No-JavaScript fallback.
2153     $html.='<noscript><img src="'.escape($t['src']).'"';
2154     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2155     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2156     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2157     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2158     $html.='></noscript></a>';
2159
2160     return $html;
2161 }
2162
2163
2164 // -----------------------------------------------------------------------------------------------
2165 // Installation
2166 // This function should NEVER be called if the file data/config.php exists.
2167 function install()
2168 {
2169     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2170     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2171
2172
2173     // This part makes sure sessions works correctly.
2174     // (Because on some hosts, session.save_path may not be set correctly,
2175     // or we may not have write access to it.)
2176     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2177     {   // Step 2: Check if data in session is correct.
2178         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2179         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2180         echo 'It currently points to '.session_save_path().'<br>';
2181         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2182         echo '<br><a href="?">Click to try again.</a></pre>';
2183         die;
2184     }
2185     if (!isset($_SESSION['session_tested']))
2186     {   // Step 1 : Try to store data in session and reload page.
2187         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2188         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2189     }
2190     if (isset($_GET['test_session']))
2191     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2192         header('Location: '.index_url($_SERVER));
2193     }
2194
2195
2196     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2197     {
2198         $tz = 'UTC';
2199         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2200             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2201                 $tz = $_POST['continent'].'/'.$_POST['city'];
2202             }
2203         }
2204         $GLOBALS['timezone'] = $tz;
2205         // Everything is ok, let's create config file.
2206         $GLOBALS['login'] = $_POST['setlogin'];
2207         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2208         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2209         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2210         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2211         try {
2212             writeConfig($GLOBALS, isLoggedIn());
2213         }
2214         catch(Exception $e) {
2215             error_log(
2216                     'ERROR while writing config file after installation.' . PHP_EOL .
2217                     $e->getMessage()
2218                 );
2219
2220             // TODO: do not handle exceptions/errors in JS.
2221             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2222             exit;
2223         }
2224         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2225         exit;
2226     }
2227
2228     // Display config form:
2229     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2230     $timezone_html = '';
2231     if ($timezone_form != '') {
2232         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2233     }
2234
2235     $PAGE = new pageBuilder;
2236     $PAGE->assign('timezone_html',$timezone_html);
2237     $PAGE->assign('timezone_js',$timezone_js);
2238     $PAGE->renderPage('install');
2239     exit;
2240 }
2241
2242 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2243    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2244    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2245    This function is called by passing the URL:
2246    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2247    [URL] is the URL of the link (e.g. a flickr page)
2248    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2249    The function below will fetch the image from the webservice and store it in the cache.
2250 */
2251 function genThumbnail()
2252 {
2253     // Make sure the parameters in the URL were generated by us.
2254     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2255     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2256
2257     // Let's see if we don't already have the image for this URL in the cache.
2258     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2259     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2260     {   // We have the thumbnail, just serve it:
2261         header('Content-Type: image/jpeg');
2262         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2263         return;
2264     }
2265     // We may also serve a blank image (if service did not respond)
2266     $blankname=hash('sha1',$_GET['url']).'.gif';
2267     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2268     {
2269         header('Content-Type: image/gif');
2270         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2271         return;
2272     }
2273
2274     // Otherwise, generate the thumbnail.
2275     $url = $_GET['url'];
2276     $domain = parse_url($url,PHP_URL_HOST);
2277
2278     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2279     {
2280         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2281         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2282
2283         // Is this a link to an image, or to a flickr page ?
2284         $imageurl='';
2285         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2286         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2287             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2288             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2289         }
2290         else // This is a flickr page (html)
2291         {
2292             // Get the flickr html page.
2293             list($headers, $data) = get_http_url($url, 20);
2294             if (strpos($headers[0], '200 OK') !== false)
2295             {
2296                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2297                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2298                 if (!empty($matches[1])) $imageurl=$matches[1];
2299
2300                 // In albums (and some other pages), the link rel="image_src" is not provided,
2301                 // but flickr provides:
2302                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2303                 if ($imageurl=='')
2304                 {
2305                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2306                     if (!empty($matches[1])) $imageurl=$matches[1];
2307                 }
2308             }
2309         }
2310
2311         if ($imageurl!='')
2312         {   // Let's download the image.
2313             // Image is 240x120, so 10 seconds to download should be enough.
2314             list($headers, $data) = get_http_url($imageurl, 10);
2315             if (strpos($headers[0], '200 OK') !== false) {
2316                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2317                 header('Content-Type: image/jpeg');
2318                 echo $data;
2319                 return;
2320             }
2321         }
2322     }
2323
2324     elseif ($domain=='vimeo.com' )
2325     {
2326         // This is more complex: we have to perform a HTTP request, then parse the result.
2327         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2328         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2329         list($headers, $data) = get_http_url('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2330         if (strpos($headers[0], '200 OK') !== false) {
2331             $t = unserialize($data);
2332             $imageurl = $t[0]['thumbnail_medium'];
2333             // Then we download the image and serve it to our client.
2334             list($headers, $data) = get_http_url($imageurl, 10);
2335             if (strpos($headers[0], '200 OK') !== false) {
2336                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2337                 header('Content-Type: image/jpeg');
2338                 echo $data;
2339                 return;
2340             }
2341         }
2342     }
2343
2344     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2345     {
2346         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2347         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2348         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2349         list($headers, $data) = get_http_url($url, 5);
2350         if (strpos($headers[0], '200 OK') !== false) {
2351             // Extract the link to the thumbnail
2352             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2353             if (!empty($matches[1]))
2354             {   // Let's download the image.
2355                 $imageurl=$matches[1];
2356                 // No control on image size, so wait long enough
2357                 list($headers, $data) = get_http_url($imageurl, 20);
2358                 if (strpos($headers[0], '200 OK') !== false) {
2359                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2360                     file_put_contents($filepath,$data); // Save image to cache.
2361                     if (resizeImage($filepath))
2362                     {
2363                         header('Content-Type: image/jpeg');
2364                         echo file_get_contents($filepath);
2365                         return;
2366                     }
2367                 }
2368             }
2369         }
2370     }
2371
2372     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2373     {
2374         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2375         // http://xkcd.com/327/
2376         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2377         list($headers, $data) = get_http_url($url, 5);
2378         if (strpos($headers[0], '200 OK') !== false) {
2379             // Extract the link to the thumbnail
2380             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2381             if (!empty($matches[1]))
2382             {   // Let's download the image.
2383                 $imageurl=$matches[1];
2384                 // No control on image size, so wait long enough
2385                 list($headers, $data) = get_http_url($imageurl, 20);
2386                 if (strpos($headers[0], '200 OK') !== false) {
2387                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2388                     file_put_contents($filepath,$data); // Save image to cache.
2389                     if (resizeImage($filepath))
2390                     {
2391                         header('Content-Type: image/jpeg');
2392                         echo file_get_contents($filepath);
2393                         return;
2394                     }
2395                 }
2396             }
2397         }
2398     }
2399
2400     else
2401     {
2402         // For all other domains, we try to download the image and make a thumbnail.
2403         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2404         list($headers, $data) = get_http_url($url, 30);
2405         if (strpos($headers[0], '200 OK') !== false) {
2406             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2407             file_put_contents($filepath,$data); // Save image to cache.
2408             if (resizeImage($filepath))
2409             {
2410                 header('Content-Type: image/jpeg');
2411                 echo file_get_contents($filepath);
2412                 return;
2413             }
2414         }
2415     }
2416
2417
2418     // Otherwise, return an empty image (8x8 transparent gif)
2419     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2420     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2421     header('Content-Type: image/gif');
2422     echo $blankgif;
2423 }
2424
2425 // Make a thumbnail of the image (to width: 120 pixels)
2426 // Returns true if success, false otherwise.
2427 function resizeImage($filepath)
2428 {
2429     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2430
2431     // Trick: some stupid people rename GIF as JPEG... or else.
2432     // So we really try to open each image type whatever the extension is.
2433     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2434     $im=false;
2435     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2436     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2437     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2438     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2439     $w = imagesx($im);
2440     $h = imagesy($im);
2441     $ystart = 0; $yheight=$h;
2442     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2443     $nw = 120;   // Desired width
2444     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2445     // Resize image:
2446     $im2 = imagecreatetruecolor($nw,$nh);
2447     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2448     imageinterlace($im2,true); // For progressive JPEG.
2449     $tempname=$filepath.'_TEMP.jpg';
2450     imagejpeg($im2, $tempname, 90);
2451     imagedestroy($im);
2452     imagedestroy($im2);
2453     unlink($filepath);
2454     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2455     return true;
2456 }
2457
2458 try {
2459     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2460 } catch(Exception $e) {
2461     error_log(
2462         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2463         $e->getMessage()
2464     );
2465 }
2466
2467 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2468 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2469 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2470 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2471 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2472 renderPage();
2473 ?>