index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.3 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, no-database Delicious clone.
   6  *
   7  * Friendly fork by the Shaarli community:
   8  *  - https://github.com/shaarli/Shaarli
   9  *
  10  * Original project by sebsauvage.net:
  11  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  12  *  - https://github.com/sebsauvage/Shaarli
  13  *
  14  * Licence: http://www.opensource.org/licenses/zlib-license.php
  15  *
  16  * Requires: PHP 5.3.x
  17  */
  18
  19 // Set 'UTC' as the default timezone if it is not defined in php.ini
  20 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  21 if (date_default_timezone_get() == '') {
  22     date_default_timezone_set('UTC');
  23 }
  24
  25 /* -----------------------------------------------------------------------------
  26  * Hardcoded parameters
  27  * You should not touch any code below (or at your own risks!)
  28  * (These parameters can be overwritten by editing the file /data/config.php)
  29  * -----------------------------------------------------------------------------
  30  */
  31
  32 /*
  33  * Shaarli directories & configuration files
  34  */
  35 // Data subdirectory
  36 $GLOBALS['config']['DATADIR'] = 'data';
  37
  38 // Main configuration file
  39 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php';
  40
  41 // Link datastore
  42 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php';
  43
  44 // Banned IPs
  45 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php';
  46
  47 // Processed updates file.
  48 $GLOBALS['config']['UPDATES_FILE'] = $GLOBALS['config']['DATADIR'].'/updates.txt';
  49
  50 // Access log
  51 $GLOBALS['config']['LOG_FILE'] = $GLOBALS['config']['DATADIR'].'/log.txt';
  52
  53 // For updates check of Shaarli
  54 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt';
  55
  56 // Set ENABLE_UPDATECHECK to disabled by default.
  57 $GLOBALS['config']['ENABLE_UPDATECHECK'] = false;
  58
  59 // RainTPL cache directory (keep the trailing slash!)
  60 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  61 // Raintpl template directory (keep the trailing slash!)
  62 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  63
  64 // Thumbnail cache directory
  65 $GLOBALS['config']['CACHEDIR'] = 'cache';
  66
  67 // Atom & RSS feed cache directory
  68 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  69
  70 /*
  71  * Global configuration
  72  */
  73 // Ban IP after this many failures
  74 $GLOBALS['config']['BAN_AFTER'] = 4;
  75 // Ban duration for IP address after login failures (in seconds)
  76 $GLOBALS['config']['BAN_DURATION'] = 1800;
  77
  78 // Feed options
  79 // Enable RSS permalinks by default.
  80 // This corresponds to the default behavior of shaarli before this was added as an option.
  81 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  82 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  83 $GLOBALS['config']['SHOW_ATOM'] = false;
  84
  85 // Link display options
  86 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  87 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  88 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  89
  90 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  91 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  92
  93 // Thumbnails
  94 // Display thumbnails in links
  95 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  96 // Store thumbnails in a local cache
  97 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  98
  99 // Update check frequency for Shaarli. 86400 seconds=24 hours
 100 $GLOBALS['config']['UPDATECHECK_BRANCH'] = 'stable';
 101 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400;
 102
 103
 104 /*
 105  * Plugin configuration
 106  *
 107  * Warning: order matters!
 108  *
 109  * These settings may be be overriden in:
 110  *  - data/config.php
 111  *  - each plugin's configuration file
 112  */
 113 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 114 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 115 //    'wallabag', 'markdown', 'addlink_toolbar',
 116 //);
 117 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 118
 119 // Initialize plugin parameters array.
 120 $GLOBALS['plugins'] = array();
 121
 122 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 123 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 124
 125 /*
 126  * PHP configuration
 127  */
 128 define('shaarli_version', '0.6.3');
 129
 130 // http://server.com/x/shaarli --> /shaarli/
 131 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 132
 133 // High execution time in case of problematic imports/exports.
 134 ini_set('max_input_time','60');
 135
 136 // Try to set max upload file size and read
 137 ini_set('memory_limit', '128M');
 138 ini_set('post_max_size', '16M');
 139 ini_set('upload_max_filesize', '16M');
 140
 141 // See all error except warnings
 142 error_reporting(E_ALL^E_WARNING);
 143 // See all errors (for debugging only)
 144 //error_reporting(-1);
 145
 146 /*
 147  * User configuration
 148  */
 149 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 150     require_once $GLOBALS['config']['CONFIG_FILE'];
 151 }
 152
 153 // Shaarli library
 154 require_once 'application/ApplicationUtils.php';
 155 require_once 'application/Cache.php';
 156 require_once 'application/CachedPage.php';
 157 require_once 'application/FileUtils.php';
 158 require_once 'application/HttpUtils.php';
 159 require_once 'application/LinkDB.php';
 160 require_once 'application/LinkFilter.php';
 161 require_once 'application/LinkUtils.php';
 162 require_once 'application/TimeZone.php';
 163 require_once 'application/Url.php';
 164 require_once 'application/Utils.php';
 165 require_once 'application/Config.php';
 166 require_once 'application/PluginManager.php';
 167 require_once 'application/Router.php';
 168 require_once 'application/Updater.php';
 169
 170 // Ensure the PHP version is supported
 171 try {
 172     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 173 } catch(Exception $exc) {
 174     header('Content-Type: text/plain; charset=utf-8');
 175     echo $exc->getMessage();
 176     exit;
 177 }
 178
 179 // Force cookie path (but do not change lifetime)
 180 $cookie = session_get_cookie_params();
 181 $cookiedir = '';
 182 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 183     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 184 }
 185 // Set default cookie expiration and path.
 186 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 187 // Set session parameters on server side.
 188 // If the user does not access any page within this time, his/her session is considered expired.
 189 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 190 // Use cookies to store session.
 191 ini_set('session.use_cookies', 1);
 192 // Force cookies for session (phpsessionID forbidden in URL).
 193 ini_set('session.use_only_cookies', 1);
 194 // Prevent PHP form using sessionID in URL if cookies are disabled.
 195 ini_set('session.use_trans_sid', false);
 196
 197 session_name('shaarli');
 198 // Start session if needed (Some server auto-start sessions).
 199 if (session_id() == '') {
 200     session_start();
 201 }
 202
 203 // Regenerate session ID if invalid or not defined in cookie.
 204 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 205     session_regenerate_id(true);
 206     $_COOKIE['shaarli'] = session_id();
 207 }
 208
 209 include "inc/rain.tpl.class.php"; //include Rain TPL
 210 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 211 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 212
 213 $pluginManager = PluginManager::getInstance();
 214 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 215
 216 ob_start();  // Output buffering for the page cache.
 217
 218
 219 // In case stupid admin has left magic_quotes enabled in php.ini:
 220 if (get_magic_quotes_gpc())
 221 {
 222     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 223     $_POST = array_map('stripslashes_deep', $_POST);
 224     $_GET = array_map('stripslashes_deep', $_GET);
 225     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 226 }
 227
 228 // Prevent caching on client side or proxy: (yes, it's ugly)
 229 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 230 header("Cache-Control: no-store, no-cache, must-revalidate");
 231 header("Cache-Control: post-check=0, pre-check=0", false);
 232 header("Pragma: no-cache");
 233
 234 // Handling of old config file which do not have the new parameters.
 235 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 236 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 237 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 238 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 239 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 240 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 241 // I really need to rewrite Shaarli with a proper configuation manager.
 242
 243 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 244     // Ensure Shaarli has proper access to its resources
 245     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 246
 247     if ($errors != array()) {
 248         $message = '<p>Insufficient permissions:</p><ul>';
 249
 250         foreach ($errors as $error) {
 251             $message .= '<li>'.$error.'</li>';
 252         }
 253         $message .= '</ul>';
 254
 255         header('Content-Type: text/html; charset=utf-8');
 256         echo $message;
 257         exit;
 258     }
 259
 260     // Display the installation form if no existing config is found
 261     install();
 262 }
 263
 264 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 265 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 266 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 267
 268 // a token depending of deployment salt, user password, and the current ip
 269 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 270
 271 autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']); // Sniff browser language and set date format accordingly.
 272 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 273
 274 //==================================================================================================
 275 // Checking session state (i.e. is the user still logged in)
 276 //==================================================================================================
 277
 278 function setup_login_state() {
 279         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 280             return true;
 281         }
 282         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 283         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 284         if (!isset($GLOBALS['login'])) {
 285             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 286             $loginFailure = true;
 287         }
 288         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 289             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 290             !$loginFailure)
 291         {
 292             fillSessionInfo();
 293             $userIsLoggedIn = true;
 294         }
 295         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 296         if (empty($_SESSION['uid']) ||
 297             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 298             time() >= $_SESSION['expires_on'])
 299         {
 300             logout();
 301             $userIsLoggedIn = false;
 302             $loginFailure = true;
 303         }
 304         if (!empty($_SESSION['longlastingsession'])) {
 305             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 306         }
 307         else {
 308             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 309         }
 310         if (!$loginFailure) {
 311             $userIsLoggedIn = true;
 312         }
 313
 314         return $userIsLoggedIn;
 315 }
 316 $userIsLoggedIn = setup_login_state();
 317
 318 // ------------------------------------------------------------------------------------------
 319 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 320 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 321 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 322 function pubsubhub()
 323 {
 324     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 325     {
 326        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 327        $topic_url = array (
 328                        index_url($_SERVER).'?do=atom',
 329                        index_url($_SERVER).'?do=rss'
 330                     );
 331        $p->publish_update($topic_url);
 332     }
 333 }
 334
 335 // ------------------------------------------------------------------------------------------
 336 // Session management
 337
 338 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 339 function allIPs()
 340 {
 341     $ip = $_SERVER["REMOTE_ADDR"];
 342     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 343     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 344     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 345     return $ip;
 346 }
 347
 348 function fillSessionInfo() {
 349         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 350         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 351         $_SESSION['username']=$GLOBALS['login'];
 352         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 353 }
 354
 355 // Check that user/password is correct.
 356 function check_auth($login,$password)
 357 {
 358     $hash = sha1($password.$login.$GLOBALS['salt']);
 359     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 360     {   // Login/password is correct.
 361                 fillSessionInfo();
 362         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login successful');
 363         return True;
 364     }
 365     logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 366     return False;
 367 }
 368
 369 // Returns true if the user is logged in.
 370 function isLoggedIn()
 371 {
 372     global $userIsLoggedIn;
 373     return $userIsLoggedIn;
 374 }
 375
 376 // Force logout.
 377 function logout() {
 378     if (isset($_SESSION)) {
 379         unset($_SESSION['uid']);
 380         unset($_SESSION['ip']);
 381         unset($_SESSION['username']);
 382         unset($_SESSION['privateonly']);
 383     }
 384     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 385 }
 386
 387
 388 // ------------------------------------------------------------------------------------------
 389 // Brute force protection system
 390 // Several consecutive failed logins will ban the IP address for 30 minutes.
 391 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?>");
 392 include $GLOBALS['config']['IPBANS_FILENAME'];
 393 // Signal a failed login. Will ban the IP if too many failures:
 394 function ban_loginFailed()
 395 {
 396     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 397     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 398     $gb['FAILURES'][$ip]++;
 399     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 400     {
 401         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 402         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 403     }
 404     $GLOBALS['IPBANS'] = $gb;
 405     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 406 }
 407
 408 // Signals a successful login. Resets failed login counter.
 409 function ban_loginOk()
 410 {
 411     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 412     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 413     $GLOBALS['IPBANS'] = $gb;
 414     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 415 }
 416
 417 // Checks if the user CAN login. If 'true', the user can try to login.
 418 function ban_canLogin()
 419 {
 420     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 421     if (isset($gb['BANS'][$ip]))
 422     {
 423         // User is banned. Check if the ban has expired:
 424         if ($gb['BANS'][$ip]<=time())
 425         {   // Ban expired, user can try to login again.
 426             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 427             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 428             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 429             return true; // Ban has expired, user can login.
 430         }
 431         return false; // User is banned.
 432     }
 433     return true; // User is not banned.
 434 }
 435
 436 // ------------------------------------------------------------------------------------------
 437 // Process login form: Check if login/password is correct.
 438 if (isset($_POST['login']))
 439 {
 440     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 441     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 442     {   // Login/password is OK.
 443         ban_loginOk();
 444         // If user wants to keep the session cookie even after the browser closes:
 445         if (!empty($_POST['longlastingsession']))
 446         {
 447                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 448             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 449             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 450
 451             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 452             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 453             // Note: Never forget the trailing slash on the cookie path!
 454             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 455         }
 456         else // Standard session expiration (=when browser closes)
 457         {
 458             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 459             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 460             session_regenerate_id(true);
 461         }
 462
 463         // Optional redirect after login:
 464         if (isset($_GET['post'])) {
 465             $uri = '?post='. urlencode($_GET['post']);
 466             foreach (array('description', 'source', 'title') as $param) {
 467                 if (!empty($_GET[$param])) {
 468                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 469                 }
 470             }
 471             header('Location: '. $uri);
 472             exit;
 473         }
 474
 475         if (isset($_GET['edit_link'])) {
 476             header('Location: ?edit_link='. escape($_GET['edit_link']));
 477             exit;
 478         }
 479
 480         if (isset($_POST['returnurl'])) {
 481             // Prevent loops over login screen.
 482             if (strpos($_POST['returnurl'], 'do=login') === false) {
 483                 header('Location: '. escape($_POST['returnurl']));
 484                 exit;
 485             }
 486         }
 487         header('Location: ?'); exit;
 488     }
 489     else
 490     {
 491         ban_loginFailed();
 492         $redir = '';
 493         if (isset($_GET['post'])) {
 494             $redir = '?post=' . urlencode($_GET['post']);
 495             foreach (array('description', 'source', 'title') as $param) {
 496                 if (!empty($_GET[$param])) {
 497                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 498                 }
 499             }
 500         }
 501         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 502         exit;
 503     }
 504 }
 505
 506 // ------------------------------------------------------------------------------------------
 507 // Misc utility functions:
 508
 509 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 510 function return_bytes($val)
 511 {
 512     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 513     switch($last)
 514     {
 515         case 'g': $val *= 1024;
 516         case 'm': $val *= 1024;
 517         case 'k': $val *= 1024;
 518     }
 519     return $val;
 520 }
 521
 522 // Try to determine max file size for uploads (POST).
 523 // Returns an integer (in bytes)
 524 function getMaxFileSize()
 525 {
 526     $size1 = return_bytes(ini_get('post_max_size'));
 527     $size2 = return_bytes(ini_get('upload_max_filesize'));
 528     // Return the smaller of two:
 529     $maxsize = min($size1,$size2);
 530     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 531     return $maxsize;
 532 }
 533
 534 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 535     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 536     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 537 function linkdate2timestamp($linkdate)
 538 {
 539     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 540         $Y=$M=$D=$h=$m=$s=0;
 541         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 542         return mktime($h,$m,$s,$M,$D,$Y);
 543     }
 544     return time();
 545 }
 546
 547 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 548     (used to build the pubDate attribute in RSS feed.)  */
 549 function linkdate2rfc822($linkdate)
 550 {
 551     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 552 }
 553
 554 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 555     (used to build the updated tags in ATOM feed.)  */
 556 function linkdate2iso8601($linkdate)
 557 {
 558     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 559 }
 560
 561 // ------------------------------------------------------------------------------------------
 562 // Token management for XSRF protection
 563 // Token should be used in any form which acts on data (create,update,delete,import...).
 564 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 565
 566 // Returns a token.
 567 function getToken()
 568 {
 569     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 570     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 571     return $rnd;
 572 }
 573
 574 // Tells if a token is OK. Using this function will destroy the token.
 575 // true=token is OK.
 576 function tokenOk($token)
 577 {
 578     if (isset($_SESSION['tokens'][$token]))
 579     {
 580         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 581         return true; // Token is OK.
 582     }
 583     return false; // Wrong token, or already used.
 584 }
 585
 586 // ------------------------------------------------------------------------------------------
 587 /* This class is in charge of building the final page.
 588    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 589    p = new pageBuilder;
 590    p.assign('myfield','myvalue');
 591    p.renderPage('mytemplate');
 592
 593 */
 594 class pageBuilder
 595 {
 596     private $tpl; // RainTPL template
 597
 598     function __construct()
 599     {
 600         $this->tpl = false;
 601     }
 602
 603     /**
 604      * Initialize all default tpl tags.
 605      */
 606     private function initialize()
 607     {
 608         $this->tpl = new RainTPL;
 609
 610         try {
 611             $version = ApplicationUtils::checkUpdate(
 612                 shaarli_version,
 613                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 614                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 615                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 616                 isLoggedIn(),
 617                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 618             );
 619             $this->tpl->assign('newVersion', escape($version));
 620             $this->tpl->assign('versionError', '');
 621
 622         } catch (Exception $exc) {
 623             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], $exc->getMessage());
 624             $this->tpl->assign('newVersion', '');
 625             $this->tpl->assign('versionError', escape($exc->getMessage()));
 626         }
 627
 628         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 629         $searchcrits = ''; // Search criteria
 630         if (!empty($_GET['searchtags'])) {
 631             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 632         }
 633         elseif (!empty($_GET['searchterm'])) {
 634             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 635         }
 636         $this->tpl->assign('searchcrits', $searchcrits);
 637         $this->tpl->assign('source', index_url($_SERVER));
 638         $this->tpl->assign('version', shaarli_version);
 639         $this->tpl->assign('scripturl', index_url($_SERVER));
 640         $this->tpl->assign('pagetitle', 'Shaarli');
 641         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 642         if (!empty($GLOBALS['title'])) {
 643             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 644         }
 645         if (!empty($GLOBALS['titleLink'])) {
 646             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 647         }
 648         if (!empty($GLOBALS['pagetitle'])) {
 649             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 650         }
 651         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 652         if (!empty($GLOBALS['plugin_errors'])) {
 653             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 654         }
 655     }
 656
 657     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 658     public function assign($what,$where)
 659     {
 660         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 661         $this->tpl->assign($what,$where);
 662     }
 663
 664     // Render a specific page (using a template).
 665     // e.g. pb.renderPage('picwall')
 666     public function renderPage($page)
 667     {
 668         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 669         $this->tpl->draw($page);
 670     }
 671
 672     /**
 673     * Render a 404 page (uses the template : tpl/404.tpl)
 674     *
 675     * usage : $PAGE->render404('The link was deleted')
 676     * @param string $message A messate to display what is not found
 677     */
 678     public function render404($message='The page you are trying to reach does not exist or has been deleted.') {
 679         header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
 680         $this->tpl->assign('error_message', $message);
 681         $this->renderPage('404');
 682     }
 683 }
 684
 685 // ------------------------------------------------------------------------------------------
 686 // Output the last N links in RSS 2.0 format.
 687 function showRSS()
 688 {
 689     header('Content-Type: application/rss+xml; charset=utf-8');
 690
 691     // $usepermalink : If true, use permalink instead of final link.
 692     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 693     // Also enabled through a config option
 694     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 695
 696     // Cache system
 697     $query = $_SERVER["QUERY_STRING"];
 698     $cache = new CachedPage(
 699         $GLOBALS['config']['PAGECACHE'],
 700         page_url($_SERVER),
 701         startsWith($query,'do=rss') && !isLoggedIn()
 702     );
 703     $cached = $cache->cachedVersion();
 704     if (! empty($cached)) {
 705         echo $cached;
 706         exit;
 707     }
 708
 709     // If cached was not found (or not usable), then read the database and build the response:
 710     $LINKSDB = new LinkDB(
 711         $GLOBALS['config']['DATASTORE'],
 712         isLoggedIn(),
 713         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 714         $GLOBALS['redirector']
 715     );
 716     // Read links from database (and filter private links if user it not logged in).
 717
 718     // Optionally filter the results:
 719     if (!empty($_GET['searchterm'])) {
 720         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 721     }
 722     elseif (!empty($_GET['searchtags'])) {
 723         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 724     }
 725     else {
 726         $linksToDisplay = $LINKSDB;
 727     }
 728
 729     $nblinksToDisplay = 50;  // Number of links to display.
 730     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 731     if (!empty($_GET['nb'])) {
 732         $nblinksToDisplay = $_GET['nb'] == 'all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 733     }
 734
 735     $pageaddr = escape(index_url($_SERVER));
 736     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 737     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 738     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 739     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 740     {
 741         echo '<!-- PubSubHubbub Discovery -->';
 742         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 743         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 744         echo '<!-- End Of PubSubHubbub Discovery -->';
 745     }
 746     $i=0;
 747     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 748     while ($i<$nblinksToDisplay && $i<count($keys))
 749     {
 750         $link = $linksToDisplay[$keys[$i]];
 751         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 752         $rfc822date = linkdate2rfc822($link['linkdate']);
 753         $absurl = $link['url'];
 754         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 755         if ($usepermalinks===true)
 756             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 757         else
 758             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 759         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 760         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 761         {
 762             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 763         }
 764
 765         // Add permalink in description
 766         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 767         // If user wants permalinks first, put the final link in description
 768         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 769         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 770         echo '<description><![CDATA['.
 771             format_description($link['description'], $GLOBALS['redirector']) .
 772             $descriptionlink . ']]></description>' . "\n</item>\n";
 773         $i++;
 774     }
 775     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 776
 777     $cache->cache(ob_get_contents());
 778     ob_end_flush();
 779     exit;
 780 }
 781
 782 // ------------------------------------------------------------------------------------------
 783 // Output the last N links in ATOM format.
 784 function showATOM()
 785 {
 786     header('Content-Type: application/atom+xml; charset=utf-8');
 787
 788     // $usepermalink : If true, use permalink instead of final link.
 789     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 790     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 791
 792     // Cache system
 793     $query = $_SERVER["QUERY_STRING"];
 794     $cache = new CachedPage(
 795         $GLOBALS['config']['PAGECACHE'],
 796         page_url($_SERVER),
 797         startsWith($query,'do=atom') && !isLoggedIn()
 798     );
 799     $cached = $cache->cachedVersion();
 800     if (!empty($cached)) {
 801         echo $cached;
 802         exit;
 803     }
 804
 805     // If cached was not found (or not usable), then read the database and build the response:
 806     // Read links from database (and filter private links if used it not logged in).
 807     $LINKSDB = new LinkDB(
 808         $GLOBALS['config']['DATASTORE'],
 809         isLoggedIn(),
 810         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 811         $GLOBALS['redirector']
 812     );
 813
 814     // Optionally filter the results:
 815     if (!empty($_GET['searchterm'])) {
 816         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 817     }
 818     else if (!empty($_GET['searchtags'])) {
 819         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 820     }
 821     else {
 822         $linksToDisplay = $LINKSDB;
 823     }
 824
 825     $nblinksToDisplay = 50;  // Number of links to display.
 826     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 827     if (!empty($_GET['nb'])) {
 828         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 829     }
 830
 831     $pageaddr=escape(index_url($_SERVER));
 832     $latestDate = '';
 833     $entries='';
 834     $i=0;
 835     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 836     while ($i<$nblinksToDisplay && $i<count($keys))
 837     {
 838         $link = $linksToDisplay[$keys[$i]];
 839         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 840         $iso8601date = linkdate2iso8601($link['linkdate']);
 841         $latestDate = max($latestDate,$iso8601date);
 842         $absurl = $link['url'];
 843         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 844         $entries.='<entry><title>'.$link['title'].'</title>';
 845         if ($usepermalinks===true)
 846             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 847         else
 848             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 849         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 850
 851         // Add permalink in description
 852         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 853         // If user wants permalinks first, put the final link in description
 854         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 855         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 856
 857         $entries .= '<content type="html"><![CDATA['.
 858             format_description($link['description'], $GLOBALS['redirector']) .
 859             $descriptionlink . "]]></content>\n";
 860         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 861         {
 862             foreach(explode(' ',$link['tags']) as $tag)
 863                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 864         }
 865         $entries.="</entry>\n";
 866         $i++;
 867     }
 868     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 869     $feed.='<title>'.$GLOBALS['title'].'</title>';
 870     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 871     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 872     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 873     {
 874         $feed.='<!-- PubSubHubbub Discovery -->';
 875         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 876         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 877     }
 878     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 879     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 880     $feed.=$entries;
 881     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 882     echo $feed;
 883
 884     $cache->cache(ob_get_contents());
 885     ob_end_flush();
 886     exit;
 887 }
 888
 889 // ------------------------------------------------------------------------------------------
 890 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 891 // Gives the last 7 days (which have links).
 892 // This RSS feed cannot be filtered.
 893 function showDailyRSS() {
 894     // Cache system
 895     $query = $_SERVER["QUERY_STRING"];
 896     $cache = new CachedPage(
 897         $GLOBALS['config']['PAGECACHE'],
 898         page_url($_SERVER),
 899         startsWith($query,'do=dailyrss') && !isLoggedIn()
 900     );
 901     $cached = $cache->cachedVersion();
 902     if (!empty($cached)) {
 903         echo $cached;
 904         exit;
 905     }
 906
 907     // If cached was not found (or not usable), then read the database and build the response:
 908     // Read links from database (and filter private links if used it not logged in).
 909     $LINKSDB = new LinkDB(
 910         $GLOBALS['config']['DATASTORE'],
 911         isLoggedIn(),
 912         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 913         $GLOBALS['redirector']
 914     );
 915
 916     /* Some Shaarlies may have very few links, so we need to look
 917        back in time (rsort()) until we have enough days ($nb_of_days).
 918     */
 919     $linkdates = array();
 920     foreach ($LINKSDB as $linkdate => $value) {
 921         $linkdates[] = $linkdate;
 922     }
 923     rsort($linkdates);
 924     $nb_of_days = 7; // We take 7 days.
 925     $today = Date('Ymd');
 926     $days = array();
 927
 928     foreach ($linkdates as $linkdate) {
 929         $day = substr($linkdate, 0, 8); // Extract day (without time)
 930         if (strcmp($day,$today) < 0) {
 931             if (empty($days[$day])) {
 932                 $days[$day] = array();
 933             }
 934             $days[$day][] = $linkdate;
 935         }
 936
 937         if (count($days) > $nb_of_days) {
 938             break; // Have we collected enough days?
 939         }
 940     }
 941
 942     // Build the RSS feed.
 943     header('Content-Type: application/rss+xml; charset=utf-8');
 944     $pageaddr = escape(index_url($_SERVER));
 945     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 946     echo '<channel>';
 947     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 948     echo '<link>'. $pageaddr .'</link>';
 949     echo '<description>Daily shared links</description>';
 950     echo '<language>en-en</language>';
 951     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 952
 953     // For each day.
 954     foreach ($days as $day => $linkdates) {
 955         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 956         $rfc822date = linkdate2rfc822($day.'_000000');
 957         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 958
 959         // Build the HTML body of this RSS entry.
 960         $html = '';
 961         $href = '';
 962         $links = array();
 963
 964         // We pre-format some fields for proper output.
 965         foreach ($linkdates as $linkdate) {
 966             $l = $LINKSDB[$linkdate];
 967             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 968             $l['thumbnail'] = thumbnail($l['url']);
 969             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 970             if (startsWith($l['url'], '?')) {
 971                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 972             }
 973             $links[$linkdate] = $l;
 974         }
 975
 976         // Then build the HTML for this day:
 977         $tpl = new RainTPL;
 978         $tpl->assign('title', $GLOBALS['title']);
 979         $tpl->assign('daydate', $daydate);
 980         $tpl->assign('absurl', $absurl);
 981         $tpl->assign('links', $links);
 982         $tpl->assign('rfc822date', escape($rfc822date));
 983         $html = $tpl->draw('dailyrss', $return_string=true);
 984
 985         echo $html . PHP_EOL;
 986     }
 987     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 988
 989     $cache->cache(ob_get_contents());
 990     ob_end_flush();
 991     exit;
 992 }
 993
 994 /**
 995  * Show the 'Daily' page.
 996  *
 997  * @param PageBuilder $pageBuilder Template engine wrapper.
 998  */
 999 function showDaily($pageBuilder)
1000 {
1001     $LINKSDB = new LinkDB(
1002         $GLOBALS['config']['DATASTORE'],
1003         isLoggedIn(),
1004         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1005         $GLOBALS['redirector']
1006     );
1007
1008     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1009     if (isset($_GET['day'])) $day=$_GET['day'];
1010
1011     $days = $LINKSDB->days();
1012     $i = array_search($day,$days);
1013     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1014     $previousday='';
1015     $nextday='';
1016     if ($i!==false)
1017     {
1018         if ($i>=1) $previousday=$days[$i-1];
1019         if ($i<count($days)-1) $nextday=$days[$i+1];
1020     }
1021
1022     try {
1023         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_DAY, $day);
1024     } catch (Exception $exc) {
1025         error_log($exc);
1026         $linksToDisplay = array();
1027     }
1028
1029     // We pre-format some fields for proper output.
1030     foreach($linksToDisplay as $key=>$link)
1031     {
1032
1033         $taglist = explode(' ',$link['tags']);
1034         uasort($taglist, 'strcasecmp');
1035         $linksToDisplay[$key]['taglist']=$taglist;
1036         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
1037         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1038         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1039     }
1040
1041     /* We need to spread the articles on 3 columns.
1042        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1043        so I manually spread entries with a simple method: I roughly evaluate the
1044        height of a div according to title and description length.
1045     */
1046     $columns=array(array(),array(),array()); // Entries to display, for each column.
1047     $fill=array(0,0,0);  // Rough estimate of columns fill.
1048     foreach($linksToDisplay as $key=>$link)
1049     {
1050         // Roughly estimate length of entry (by counting characters)
1051         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1052         // Description: 836 characters gives roughly 342 pixel height.
1053         // This is not perfect, but it's usually OK.
1054         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1055         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1056         // Then put in column which is the less filled:
1057         $smallest=min($fill); // find smallest value in array.
1058         $index=array_search($smallest,$fill); // find index of this smallest value.
1059         array_push($columns[$index],$link); // Put entry in this column.
1060         $fill[$index]+=$length;
1061     }
1062
1063     $data = array(
1064         'linksToDisplay' => $linksToDisplay,
1065         'linkcount' => count($LINKSDB),
1066         'cols' => $columns,
1067         'day' => linkdate2timestamp($day.'_000000'),
1068         'previousday' => $previousday,
1069         'nextday' => $nextday,
1070     );
1071     $pluginManager = PluginManager::getInstance();
1072     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1073
1074     foreach ($data as $key => $value) {
1075         $pageBuilder->assign($key, $value);
1076     }
1077
1078     $pageBuilder->renderPage('daily');
1079     exit;
1080 }
1081
1082 // Renders the linklist
1083 function showLinkList($PAGE, $LINKSDB) {
1084     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1085     $PAGE->renderPage('linklist');
1086 }
1087
1088
1089 // ------------------------------------------------------------------------------------------
1090 // Render HTML page (according to URL parameters and user rights)
1091 function renderPage()
1092 {
1093     $LINKSDB = new LinkDB(
1094         $GLOBALS['config']['DATASTORE'],
1095         isLoggedIn(),
1096         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1097         $GLOBALS['redirector']
1098     );
1099
1100     $updater = new Updater(
1101         read_updates_file($GLOBALS['config']['UPDATES_FILE']),
1102         $GLOBALS,
1103         $LINKSDB,
1104         isLoggedIn()
1105     );
1106     try {
1107         $newUpdates = $updater->update();
1108         if (! empty($newUpdates)) {
1109             write_updates_file(
1110                 $GLOBALS['config']['UPDATES_FILE'],
1111                 $updater->getDoneUpdates()
1112             );
1113         }
1114     }
1115     catch(Exception $e) {
1116         die($e->getMessage());
1117     }
1118
1119     $PAGE = new pageBuilder;
1120
1121     // Determine which page will be rendered.
1122     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1123     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1124
1125     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1126     // Then assign generated data to RainTPL.
1127     $common_hooks = array(
1128         'includes',
1129         'header',
1130         'footer',
1131     );
1132     $pluginManager = PluginManager::getInstance();
1133     foreach($common_hooks as $name) {
1134         $plugin_data = array();
1135         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1136             array(
1137                 'target' => $targetPage,
1138                 'loggedin' => isLoggedIn()
1139             )
1140         );
1141         $PAGE->assign('plugins_' . $name, $plugin_data);
1142     }
1143
1144     // -------- Display login form.
1145     if ($targetPage == Router::$PAGE_LOGIN)
1146     {
1147         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1148         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1149         $PAGE->assign('token',$token);
1150         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1151         $PAGE->renderPage('loginform');
1152         exit;
1153     }
1154     // -------- User wants to logout.
1155     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1156     {
1157         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1158         logout();
1159         header('Location: ?');
1160         exit;
1161     }
1162
1163     // -------- Picture wall
1164     if ($targetPage == Router::$PAGE_PICWALL)
1165     {
1166         // Optionally filter the results:
1167         if (!empty($_GET['searchterm'])) {
1168             $links = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
1169         }
1170         elseif (! empty($_GET['searchtags'])) {
1171             $links = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
1172         }
1173         else {
1174             $links = $LINKSDB;
1175         }
1176
1177         $linksToDisplay = array();
1178
1179         // Get only links which have a thumbnail.
1180         foreach($links as $link)
1181         {
1182             $permalink='?'.escape(smallhash($link['linkdate']));
1183             $thumb=lazyThumbnail($link['url'],$permalink);
1184             if ($thumb!='') // Only output links which have a thumbnail.
1185             {
1186                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1187                 $linksToDisplay[]=$link; // Add to array.
1188             }
1189         }
1190
1191         $data = array(
1192             'linkcount' => count($LINKSDB),
1193             'linksToDisplay' => $linksToDisplay,
1194         );
1195         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1196
1197         foreach ($data as $key => $value) {
1198             $PAGE->assign($key, $value);
1199         }
1200
1201         $PAGE->renderPage('picwall');
1202         exit;
1203     }
1204
1205     // -------- Tag cloud
1206     if ($targetPage == Router::$PAGE_TAGCLOUD)
1207     {
1208         $tags= $LINKSDB->allTags();
1209
1210         // We sort tags alphabetically, then choose a font size according to count.
1211         // First, find max value.
1212         $maxcount = 0;
1213         foreach ($tags as $value) {
1214             $maxcount = max($maxcount, $value);
1215         }
1216
1217         // Sort tags alphabetically: case insensitive, support locale if avalaible.
1218         uksort($tags, function($a, $b) {
1219             // Collator is part of PHP intl.
1220             if (class_exists('Collator')) {
1221                 $c = new Collator(setlocale(LC_COLLATE, 0));
1222                 if (!intl_is_failure(intl_get_error_code())) {
1223                     return $c->compare($a, $b);
1224                 }
1225             }
1226             return strcasecmp($a, $b);
1227         });
1228
1229         $tagList=array();
1230         foreach($tags as $key=>$value)
1231         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1232         {
1233             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1234         }
1235
1236         $data = array(
1237             'linkcount' => count($LINKSDB),
1238             'tags' => $tagList,
1239         );
1240         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1241
1242         foreach ($data as $key => $value) {
1243             $PAGE->assign($key, $value);
1244         }
1245
1246         $PAGE->renderPage('tagcloud');
1247         exit;
1248     }
1249
1250     // Daily page.
1251     if ($targetPage == Router::$PAGE_DAILY) {
1252         showDaily($PAGE);
1253     }
1254
1255     // Display openseach plugin (XML)
1256     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1257         header('Content-Type: application/xml; charset=utf-8');
1258         $PAGE->assign('serverurl', index_url($_SERVER));
1259         $PAGE->renderPage('opensearch');
1260         exit;
1261     }
1262
1263     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1264     if (isset($_GET['addtag']))
1265     {
1266         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1267         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1268         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1269
1270         // Prevent redirection loop
1271         if (isset($params['addtag'])) {
1272             unset($params['addtag']);
1273         }
1274
1275         // Check if this tag is already in the search query and ignore it if it is.
1276         // Each tag is always separated by a space
1277         if (isset($params['searchtags'])) {
1278             $current_tags = explode(' ', $params['searchtags']);
1279         } else {
1280             $current_tags = array();
1281         }
1282         $addtag = true;
1283         foreach ($current_tags as $value) {
1284             if ($value === $_GET['addtag']) {
1285                 $addtag = false;
1286                 break;
1287             }
1288         }
1289         // Append the tag if necessary
1290         if (empty($params['searchtags'])) {
1291             $params['searchtags'] = trim($_GET['addtag']);
1292         }
1293         else if ($addtag) {
1294             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1295         }
1296
1297         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1298         header('Location: ?'.http_build_query($params));
1299         exit;
1300     }
1301
1302     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1303     if (isset($_GET['removetag'])) {
1304         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1305         if (empty($_SERVER['HTTP_REFERER'])) {
1306             header('Location: ?');
1307             exit;
1308         }
1309
1310         // In case browser does not send HTTP_REFERER
1311         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1312
1313         // Prevent redirection loop
1314         if (isset($params['removetag'])) {
1315             unset($params['removetag']);
1316         }
1317
1318         if (isset($params['searchtags'])) {
1319             $tags = explode(' ', $params['searchtags']);
1320             // Remove value from array $tags.
1321             $tags = array_diff($tags, array($_GET['removetag']));
1322             $params['searchtags'] = implode(' ',$tags);
1323
1324             if (empty($params['searchtags'])) {
1325                 unset($params['searchtags']);
1326             }
1327
1328             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1329         }
1330         header('Location: ?'.http_build_query($params));
1331         exit;
1332     }
1333
1334     // -------- User wants to change the number of links per page (linksperpage=...)
1335     if (isset($_GET['linksperpage'])) {
1336         if (is_numeric($_GET['linksperpage'])) {
1337             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1338         }
1339
1340         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1341         exit;
1342     }
1343
1344     // -------- User wants to see only private links (toggle)
1345     if (isset($_GET['privateonly'])) {
1346         if (empty($_SESSION['privateonly'])) {
1347             $_SESSION['privateonly'] = 1; // See only private links
1348         } else {
1349             unset($_SESSION['privateonly']); // See all links
1350         }
1351
1352         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1353         exit;
1354     }
1355
1356     // -------- Handle other actions allowed for non-logged in users:
1357     if (!isLoggedIn())
1358     {
1359         // User tries to post new link but is not logged in:
1360         // Show login screen, then redirect to ?post=...
1361         if (isset($_GET['post']))
1362         {
1363             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1364             exit;
1365         }
1366
1367                 // Same case as above except that user tried to access ?do=addlink without being logged in
1368                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1369                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1370                         header('Location: ?do=login&post=');
1371                         exit;
1372                 }
1373         showLinkList($PAGE, $LINKSDB);
1374         if (isset($_GET['edit_link'])) {
1375             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1376             exit;
1377         }
1378
1379         exit; // Never remove this one! All operations below are reserved for logged in user.
1380     }
1381
1382     // -------- All other functions are reserved for the registered user:
1383
1384     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1385     if ($targetPage == Router::$PAGE_TOOLS)
1386     {
1387         $data = array(
1388             'linkcount' => count($LINKSDB),
1389             'pageabsaddr' => index_url($_SERVER),
1390         );
1391         $pluginManager->executeHooks('render_tools', $data);
1392
1393         foreach ($data as $key => $value) {
1394             $PAGE->assign($key, $value);
1395         }
1396
1397         $PAGE->renderPage('tools');
1398         exit;
1399     }
1400
1401     // -------- User wants to change his/her password.
1402     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1403     {
1404         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1405         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1406         {
1407             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1408
1409             // Make sure old password is correct.
1410             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1411             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1412             // Save new password
1413             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1414             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1415             try {
1416                 writeConfig($GLOBALS, isLoggedIn());
1417             }
1418             catch(Exception $e) {
1419                 error_log(
1420                     'ERROR while writing config file after changing password.' . PHP_EOL .
1421                     $e->getMessage()
1422                 );
1423
1424                 // TODO: do not handle exceptions/errors in JS.
1425                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1426                 exit;
1427             }
1428             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1429             exit;
1430         }
1431         else // show the change password form.
1432         {
1433             $PAGE->assign('linkcount',count($LINKSDB));
1434             $PAGE->assign('token',getToken());
1435             $PAGE->renderPage('changepassword');
1436             exit;
1437         }
1438     }
1439
1440     // -------- User wants to change configuration
1441     if ($targetPage == Router::$PAGE_CONFIGURE)
1442     {
1443         if (!empty($_POST['title']) )
1444         {
1445             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1446             $tz = 'UTC';
1447             if (!empty($_POST['continent']) && !empty($_POST['city']))
1448                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1449                     $tz = $_POST['continent'].'/'.$_POST['city'];
1450             $GLOBALS['timezone'] = $tz;
1451             $GLOBALS['title']=$_POST['title'];
1452             $GLOBALS['titleLink']=$_POST['titleLink'];
1453             $GLOBALS['redirector']=$_POST['redirector'];
1454             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1455             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1456             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1457             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1458             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1459             try {
1460                 writeConfig($GLOBALS, isLoggedIn());
1461             }
1462             catch(Exception $e) {
1463                 error_log(
1464                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1465                     $e->getMessage()
1466                 );
1467
1468                 // TODO: do not handle exceptions/errors in JS.
1469                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1470                 exit;
1471             }
1472             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1473             exit;
1474         }
1475         else // Show the configuration form.
1476         {
1477             $PAGE->assign('linkcount',count($LINKSDB));
1478             $PAGE->assign('token',getToken());
1479             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1480             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1481             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1482             $PAGE->assign('timezone_form', $timezone_form);
1483             $PAGE->assign('timezone_js',$timezone_js);
1484             $PAGE->renderPage('configure');
1485             exit;
1486         }
1487     }
1488
1489     // -------- User wants to rename a tag or delete it
1490     if ($targetPage == Router::$PAGE_CHANGETAG)
1491     {
1492         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1493             $PAGE->assign('linkcount', count($LINKSDB));
1494             $PAGE->assign('token', getToken());
1495             $PAGE->assign('tags', $LINKSDB->allTags());
1496             $PAGE->renderPage('changetag');
1497             exit;
1498         }
1499
1500         if (!tokenOk($_POST['token'])) {
1501             die('Wrong token.');
1502         }
1503
1504         // Delete a tag:
1505         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1506             $needle=trim($_POST['fromtag']);
1507             // True for case-sensitive tag search.
1508             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1509             foreach($linksToAlter as $key=>$value)
1510             {
1511                 $tags = explode(' ',trim($value['tags']));
1512                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1513                 $value['tags']=trim(implode(' ',$tags));
1514                 $LINKSDB[$key]=$value;
1515             }
1516             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1517             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1518             exit;
1519         }
1520
1521         // Rename a tag:
1522         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1523             $needle=trim($_POST['fromtag']);
1524             // True for case-sensitive tag search.
1525             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1526             foreach($linksToAlter as $key=>$value)
1527             {
1528                 $tags = explode(' ',trim($value['tags']));
1529                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1530                 $value['tags']=trim(implode(' ',$tags));
1531                 $LINKSDB[$key]=$value;
1532             }
1533             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1534             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1535             exit;
1536         }
1537     }
1538
1539     // -------- User wants to add a link without using the bookmarklet: Show form.
1540     if ($targetPage == Router::$PAGE_ADDLINK)
1541     {
1542         $PAGE->assign('linkcount',count($LINKSDB));
1543         $PAGE->renderPage('addlink');
1544         exit;
1545     }
1546
1547     // -------- User clicked the "Save" button when editing a link: Save link to database.
1548     if (isset($_POST['save_edit']))
1549     {
1550         // Go away!
1551         if (! tokenOk($_POST['token'])) {
1552             die('Wrong token.');
1553         }
1554         // Remove multiple spaces.
1555         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1556         // Remove first '-' char in tags.
1557         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1558         // Remove duplicates.
1559         $tags = implode(' ', array_unique(explode(' ', $tags)));
1560         $linkdate = $_POST['lf_linkdate'];
1561         $url = trim($_POST['lf_url']);
1562         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1563             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1564             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1565         ) {
1566             $url = 'http://' . $url;
1567         }
1568
1569         $link = array(
1570             'title' => trim($_POST['lf_title']),
1571             'url' => $url,
1572             'description' => trim($_POST['lf_description']),
1573             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1574             'linkdate' => $linkdate,
1575             'tags' => str_replace(',', ' ', $tags)
1576         );
1577         // If title is empty, use the URL as title.
1578         if ($link['title'] == '') {
1579             $link['title'] = $link['url'];
1580         }
1581
1582         $pluginManager->executeHooks('save_link', $link);
1583
1584         $LINKSDB[$linkdate] = $link;
1585         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1586         pubsubhub();
1587
1588         // If we are called from the bookmarklet, we must close the popup:
1589         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1590             echo '<script>self.close();</script>';
1591             exit;
1592         }
1593
1594         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1595         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1596         // Scroll to the link which has been edited.
1597         $location .= '#' . smallHash($_POST['lf_linkdate']);
1598         // After saving the link, redirect to the page the user was on.
1599         header('Location: '. $location);
1600         exit;
1601     }
1602
1603     // -------- User clicked the "Cancel" button when editing a link.
1604     if (isset($_POST['cancel_edit']))
1605     {
1606         // If we are called from the bookmarklet, we must close the popup:
1607         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1608         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1609         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1610         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1611         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1612         exit;
1613     }
1614
1615     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1616     if (isset($_POST['delete_link']))
1617     {
1618         if (!tokenOk($_POST['token'])) die('Wrong token.');
1619         // We do not need to ask for confirmation:
1620         // - confirmation is handled by JavaScript
1621         // - we are protected from XSRF by the token.
1622         $linkdate=$_POST['lf_linkdate'];
1623
1624         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1625
1626         unset($LINKSDB[$linkdate]);
1627         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1628
1629         // If we are called from the bookmarklet, we must close the popup:
1630         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1631         // Pick where we're going to redirect
1632         // =============================================================
1633         // Basically, we can't redirect to where we were previously if it was a permalink
1634         // or an edit_link, because it would 404.
1635         // Cases:
1636         //    - /             : nothing in $_GET, redirect to self
1637         //    - /?page        : redirect to self
1638         //    - /?searchterm  : redirect to self (there might be other links)
1639         //    - /?searchtags  : redirect to self
1640         //    - /permalink    : redirect to / (the link does not exist anymore)
1641         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1642         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1643         // redirect is not satisfied, and only then redirect to /
1644         $location = "?";
1645         // Self redirection
1646         if (count($_GET) == 0
1647             || isset($_GET['page'])
1648             || isset($_GET['searchterm'])
1649             || isset($_GET['searchtags'])
1650         ) {
1651             if (isset($_POST['returnurl'])) {
1652                 $location = $_POST['returnurl']; // Handle redirects given by the form
1653             } else {
1654                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1655             }
1656         }
1657
1658         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1659         exit;
1660     }
1661
1662     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1663     if (isset($_GET['edit_link']))
1664     {
1665         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1666         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1667         $data = array(
1668             'linkcount' => count($LINKSDB),
1669             'link' => $link,
1670             'link_is_new' => false,
1671             'token' => getToken(),
1672             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1673             'tags' => $LINKSDB->allTags(),
1674         );
1675         $pluginManager->executeHooks('render_editlink', $data);
1676
1677         foreach ($data as $key => $value) {
1678             $PAGE->assign($key, $value);
1679         }
1680
1681         $PAGE->renderPage('editlink');
1682         exit;
1683     }
1684
1685     // -------- User want to post a new link: Display link edit form.
1686     if (isset($_GET['post'])) {
1687         $url = cleanup_url(escape($_GET['post']));
1688
1689         $link_is_new = false;
1690         // Check if URL is not already in database (in this case, we will edit the existing link)
1691         $link = $LINKSDB->getLinkFromUrl($url);
1692         if (!$link)
1693         {
1694             $link_is_new = true;
1695             $linkdate = strval(date('Ymd_His'));
1696             // Get title if it was provided in URL (by the bookmarklet).
1697             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1698             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1699             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1700             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1701             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1702             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1703             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1704                 // Short timeout to keep the application responsive
1705                 list($headers, $content) = get_http_response($url, 4);
1706                 if (strpos($headers[0], '200 OK') !== false) {
1707                     // Retrieve charset.
1708                     $charset = get_charset($headers, $content);
1709                     // Extract title.
1710                     $title = html_extract_title($content);
1711                     // Re-encode title in utf-8 if necessary.
1712                     if (! empty($title) && $charset != 'utf-8') {
1713                         $title = mb_convert_encoding($title, $charset, 'utf-8');
1714                     }
1715                 }
1716             }
1717
1718             if ($url == '') {
1719                 $url = '?' . smallHash($linkdate);
1720                 $title = 'Note: ';
1721             }
1722
1723             $link = array(
1724                 'linkdate' => $linkdate,
1725                 'title' => $title,
1726                 'url' => $url,
1727                 'description' => $description,
1728                 'tags' => $tags,
1729                 'private' => $private
1730             );
1731         }
1732
1733         $data = array(
1734             'linkcount' => count($LINKSDB),
1735             'link' => $link,
1736             'link_is_new' => $link_is_new,
1737             'token' => getToken(), // XSRF protection.
1738             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1739             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1740             'tags' => $LINKSDB->allTags(),
1741         );
1742         $pluginManager->executeHooks('render_editlink', $data);
1743
1744         foreach ($data as $key => $value) {
1745             $PAGE->assign($key, $value);
1746         }
1747
1748         $PAGE->renderPage('editlink');
1749         exit;
1750     }
1751
1752     // -------- Export as Netscape Bookmarks HTML file.
1753     if ($targetPage == Router::$PAGE_EXPORT)
1754     {
1755         if (empty($_GET['what']))
1756         {
1757             $PAGE->assign('linkcount',count($LINKSDB));
1758             $PAGE->renderPage('export');
1759             exit;
1760         }
1761         $exportWhat=$_GET['what'];
1762         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1763
1764         header('Content-Type: text/html; charset=utf-8');
1765         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1766         $currentdate=date('Y/m/d H:i:s');
1767         echo <<<HTML
1768 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1769 <!-- This is an automatically generated file.
1770      It will be read and overwritten.
1771      DO NOT EDIT! -->
1772 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1773 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1774 <TITLE>Bookmarks</TITLE>
1775 <H1>Bookmarks</H1>
1776 HTML;
1777         foreach($LINKSDB as $link)
1778         {
1779             if ($exportWhat=='all' ||
1780                ($exportWhat=='private' && $link['private']!=0) ||
1781                ($exportWhat=='public' && $link['private']==0))
1782             {
1783                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1784                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1785                 echo '>'.$link['title']."</A>\n";
1786                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1787             }
1788         }
1789                 exit;
1790     }
1791
1792     // -------- User is uploading a file for import
1793     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1794     {
1795         // If file is too big, some form field may be missing.
1796         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1797         {
1798             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1799             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1800             exit;
1801         }
1802         if (!tokenOk($_POST['token'])) die('Wrong token.');
1803         importFile();
1804         exit;
1805     }
1806
1807     // -------- Show upload/import dialog:
1808     if ($targetPage == Router::$PAGE_IMPORT)
1809     {
1810         $PAGE->assign('linkcount',count($LINKSDB));
1811         $PAGE->assign('token',getToken());
1812         $PAGE->assign('maxfilesize',getMaxFileSize());
1813         $PAGE->renderPage('import');
1814         exit;
1815     }
1816
1817     // Plugin administration page
1818     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1819         $pluginMeta = $pluginManager->getPluginsMeta();
1820
1821         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1822         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1823         // Load parameters.
1824         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $GLOBALS['plugins']);
1825         uasort(
1826             $enabledPlugins,
1827             function($a, $b) { return $a['order'] - $b['order']; }
1828         );
1829         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1830
1831         $PAGE->assign('enabledPlugins', $enabledPlugins);
1832         $PAGE->assign('disabledPlugins', $disabledPlugins);
1833         $PAGE->renderPage('pluginsadmin');
1834         exit;
1835     }
1836
1837     // Plugin administration form action
1838     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1839         try {
1840             if (isset($_POST['parameters_form'])) {
1841                 unset($_POST['parameters_form']);
1842                 foreach ($_POST as $param => $value) {
1843                     $GLOBALS['plugins'][$param] = escape($value);
1844                 }
1845             }
1846             else {
1847                 $GLOBALS['config']['ENABLED_PLUGINS'] = save_plugin_config($_POST);
1848             }
1849             writeConfig($GLOBALS, isLoggedIn());
1850         }
1851         catch (Exception $e) {
1852             error_log(
1853                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1854                 $e->getMessage()
1855             );
1856
1857             // TODO: do not handle exceptions/errors in JS.
1858             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1859             exit;
1860         }
1861         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1862         exit;
1863     }
1864
1865     // -------- Otherwise, simply display search form and links:
1866     showLinkList($PAGE, $LINKSDB);
1867     exit;
1868 }
1869
1870 // -----------------------------------------------------------------------------------------------
1871 // Process the import file form.
1872 function importFile()
1873 {
1874     if (!isLoggedIn()) { die('Not allowed.'); }
1875     $LINKSDB = new LinkDB(
1876         $GLOBALS['config']['DATASTORE'],
1877         isLoggedIn(),
1878         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1879         $GLOBALS['redirector']
1880     );
1881     $filename=$_FILES['filetoupload']['name'];
1882     $filesize=$_FILES['filetoupload']['size'];
1883     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1884     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1885     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1886     $import_count=0;
1887
1888     // Sniff file type:
1889     $type='unknown';
1890     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1891
1892     // Then import the bookmarks.
1893     if ($type=='netscape')
1894     {
1895         // This is a standard Netscape-style bookmark file.
1896         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1897         foreach(explode('<DT>',$data) as $html) // explode is very fast
1898         {
1899             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1900             $d = explode('<DD>',$html);
1901             if (startswith($d[0],'<A '))
1902             {
1903                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1904                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1905                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1906                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1907                 $raw_add_date=0;
1908                 foreach($matches as $m)
1909                 {
1910                     $attr=$m[1]; $value=$m[2];
1911                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1912                     elseif ($attr=='ADD_DATE')
1913                     {
1914                         $raw_add_date=intval($value);
1915                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1916                     }
1917                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1918                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1919                 }
1920                 if ($link['url']!='')
1921                 {
1922                     if ($private==1) $link['private']=1;
1923                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1924                     if ($dblink==false)
1925                     {  // Link not in database, let's import it...
1926                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1927
1928                        // Make sure date/time is not already used by another link.
1929                        // (Some bookmark files have several different links with the same ADD_DATE)
1930                        // We increment date by 1 second until we find a date which is not used in DB.
1931                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1932                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1933                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1934                        $LINKSDB[$link['linkdate']] = $link;
1935                        $import_count++;
1936                     }
1937                     else // Link already present in database.
1938                     {
1939                         if ($overwrite)
1940                         {   // If overwrite is required, we import link data, except date/time.
1941                             $link['linkdate']=$dblink['linkdate'];
1942                             $LINKSDB[$link['linkdate']] = $link;
1943                             $import_count++;
1944                         }
1945                     }
1946
1947                 }
1948             }
1949         }
1950         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1951
1952         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1953     }
1954     else
1955     {
1956         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1957     }
1958 }
1959
1960 // -----------------------------------------------------------------------------------------------
1961 // Template for the list of links (<div id="linklist">)
1962 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1963 function buildLinkList($PAGE,$LINKSDB)
1964 {
1965     // ---- Filter link database according to parameters
1966     $search_type = '';
1967     $search_crits = '';
1968     $privateonly = !empty($_SESSION['privateonly']) ? true : false;
1969
1970     // Fulltext search
1971     if (isset($_GET['searchterm'])) {
1972         $search_crits = escape(trim($_GET['searchterm']));
1973         $search_type = LinkFilter::$FILTER_TEXT;
1974         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1975     }
1976     // Search by tag
1977     elseif (isset($_GET['searchtags'])) {
1978         $search_crits = explode(' ', escape(trim($_GET['searchtags'])));
1979         $search_type = LinkFilter::$FILTER_TAG;
1980         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1981     }
1982     // Detect smallHashes in URL.
1983     elseif (isset($_SERVER['QUERY_STRING'])
1984         && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/', $_SERVER['QUERY_STRING'])) {
1985         $search_type = LinkFilter::$FILTER_HASH;
1986         $search_crits = substr(trim($_SERVER["QUERY_STRING"], '/'), 0, 6);
1987         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits);
1988
1989         if (count($linksToDisplay) == 0) {
1990             $PAGE->render404('The link you are trying to reach does not exist or has been deleted.');
1991             exit;
1992         }
1993     }
1994     // Otherwise, display without filtering.
1995     else {
1996         $linksToDisplay = $LINKSDB->filter('', '', false, $privateonly);
1997     }
1998
1999     // ---- Handle paging.
2000     $keys = array();
2001     foreach ($linksToDisplay as $key => $value) {
2002         $keys[] = $key;
2003     }
2004
2005     // If there is only a single link, we change on-the-fly the title of the page.
2006     if (count($linksToDisplay) == 1) {
2007         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
2008     }
2009
2010     // Select articles according to paging.
2011     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
2012     $pagecount = $pagecount == 0 ? 1 : $pagecount;
2013     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
2014     $page = $page < 1 ? 1 : $page;
2015     $page = $page > $pagecount ? $pagecount : $page;
2016     // Start index.
2017     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
2018     $end = $i + $_SESSION['LINKS_PER_PAGE'];
2019     $linkDisp = array();
2020     while ($i<$end && $i<count($keys))
2021     {
2022         $link = $linksToDisplay[$keys[$i]];
2023         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
2024         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
2025         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
2026         $link['timestamp'] = linkdate2timestamp($link['linkdate']);
2027         $taglist = explode(' ', $link['tags']);
2028         uasort($taglist, 'strcasecmp');
2029         $link['taglist'] = $taglist;
2030         $link['shorturl'] = smallHash($link['linkdate']);
2031         // Check for both signs of a note: starting with ? and 7 chars long.
2032         if ($link['url'][0] === '?' &&
2033             strlen($link['url']) === 7) {
2034             $link['url'] = index_url($_SERVER) . $link['url'];
2035         }
2036
2037         $linkDisp[$keys[$i]] = $link;
2038         $i++;
2039     }
2040
2041     // Compute paging navigation
2042     $searchterm = empty($_GET['searchterm']) ? '' : '&searchterm=' . $_GET['searchterm'];
2043     $searchtags = empty($_GET['searchtags']) ? '' : '&searchtags=' . $_GET['searchtags'];
2044     $previous_page_url = '';
2045     if ($i != count($keys)) {
2046         $previous_page_url = '?page=' . ($page+1) . $searchterm . $searchtags;
2047     }
2048     $next_page_url='';
2049     if ($page>1) {
2050         $next_page_url = '?page=' . ($page-1) . $searchterm . $searchtags;
2051     }
2052
2053     $token = '';
2054     if (isLoggedIn()) {
2055         $token = getToken();
2056     }
2057
2058     // Fill all template fields.
2059     $data = array(
2060         'linkcount' => count($LINKSDB),
2061         'previous_page_url' => $previous_page_url,
2062         'next_page_url' => $next_page_url,
2063         'page_current' => $page,
2064         'page_max' => $pagecount,
2065         'result_count' => count($linksToDisplay),
2066         'search_type' => $search_type,
2067         'search_crits' => $search_crits,
2068         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
2069         'token' => $token,
2070         'links' => $linkDisp,
2071         'tags' => $LINKSDB->allTags(),
2072     );
2073     // FIXME! temporary fix - see #399.
2074     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
2075         $data['pagetitle'] = $GLOBALS['pagetitle'];
2076     }
2077
2078     $pluginManager = PluginManager::getInstance();
2079     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
2080
2081     foreach ($data as $key => $value) {
2082         $PAGE->assign($key, $value);
2083     }
2084
2085     return;
2086 }
2087
2088 // Compute the thumbnail for a link.
2089 //
2090 // With a link to the original URL.
2091 // Understands various services (youtube.com...)
2092 // Input: $url = URL for which the thumbnail must be found.
2093 //        $href = if provided, this URL will be followed instead of $url
2094 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
2095 // Some of them may be missing.
2096 // Return an empty array if no thumbnail available.
2097 function computeThumbnail($url,$href=false)
2098 {
2099     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
2100     if ($href==false) $href=$url;
2101
2102     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
2103     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
2104     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
2105     $domain = parse_url($url,PHP_URL_HOST);
2106     if ($domain=='youtube.com' || $domain=='www.youtube.com')
2107     {
2108         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
2109         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
2110                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2111     }
2112     if ($domain=='youtu.be') // Youtube short links
2113     {
2114         $path = parse_url($url,PHP_URL_PATH);
2115         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
2116                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2117     }
2118     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
2119     {
2120         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2121         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2122                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2123     }
2124
2125     if ($domain=='imgur.com')
2126     {
2127         $path = parse_url($url,PHP_URL_PATH);
2128         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2129         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2130                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2131         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2132                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2133
2134         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2135                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2136     }
2137     if ($domain=='i.imgur.com')
2138     {
2139         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2140         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2141                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2142     }
2143     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2144     {
2145         if (strpos($url,'dailymotion.com/video/')!==false)
2146         {
2147             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2148             return array('src'=>$thumburl,
2149                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2150         }
2151     }
2152     if (endsWith($domain,'.imageshack.us'))
2153     {
2154         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2155         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2156         {
2157             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2158             return array('src'=>$thumburl,
2159                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2160         }
2161     }
2162
2163     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2164     // So we deport the thumbnail generation in order not to slow down page generation
2165     // (and we also cache the thumbnail)
2166
2167     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2168
2169     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2170         || $domain=='vimeo.com'
2171         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2172         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2173     )
2174     {
2175         if ($domain=='vimeo.com')
2176         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2177             $path = parse_url($url,PHP_URL_PATH);
2178             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2179         }
2180         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2181         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2182             $path = parse_url($url,PHP_URL_PATH);
2183             if (!preg_match('!/\d+.+?!',$path)) return array();
2184         }
2185         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2186         {   // Make sure this TED URL points to a video (/talks/...)
2187             $path = parse_url($url,PHP_URL_PATH);
2188             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2189         }
2190         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2191         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2192                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2193     }
2194
2195     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2196     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2197     // But using the extension will do.
2198     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2199     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2200     {
2201         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2202         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2203                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2204     }
2205     return array(); // No thumbnail.
2206
2207 }
2208
2209
2210 // Returns the HTML code to display a thumbnail for a link
2211 // with a link to the original URL.
2212 // Understands various services (youtube.com...)
2213 // Input: $url = URL for which the thumbnail must be found.
2214 //        $href = if provided, this URL will be followed instead of $url
2215 // Returns '' if no thumbnail available.
2216 function thumbnail($url,$href=false)
2217 {
2218     $t = computeThumbnail($url,$href);
2219     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2220
2221     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2222     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2223     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2224     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2225     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2226     $html.='></a>';
2227     return $html;
2228 }
2229
2230 // Returns the HTML code to display a thumbnail for a link
2231 // for the picture wall (using lazy image loading)
2232 // Understands various services (youtube.com...)
2233 // Input: $url = URL for which the thumbnail must be found.
2234 //        $href = if provided, this URL will be followed instead of $url
2235 // Returns '' if no thumbnail available.
2236 function lazyThumbnail($url,$href=false)
2237 {
2238     $t = computeThumbnail($url,$href);
2239     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2240
2241     $html='<a href="'.escape($t['href']).'">';
2242
2243     // Lazy image
2244     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2245
2246     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2247     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2248     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2249     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2250     $html.='>';
2251
2252     // No-JavaScript fallback.
2253     $html.='<noscript><img src="'.escape($t['src']).'"';
2254     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2255     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2256     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2257     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2258     $html.='></noscript></a>';
2259
2260     return $html;
2261 }
2262
2263
2264 // -----------------------------------------------------------------------------------------------
2265 // Installation
2266 // This function should NEVER be called if the file data/config.php exists.
2267 function install()
2268 {
2269     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2270     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2271
2272
2273     // This part makes sure sessions works correctly.
2274     // (Because on some hosts, session.save_path may not be set correctly,
2275     // or we may not have write access to it.)
2276     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2277     {   // Step 2: Check if data in session is correct.
2278         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2279         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2280         echo 'It currently points to '.session_save_path().'<br>';
2281         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2282         echo '<br><a href="?">Click to try again.</a></pre>';
2283         die;
2284     }
2285     if (!isset($_SESSION['session_tested']))
2286     {   // Step 1 : Try to store data in session and reload page.
2287         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2288         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2289     }
2290     if (isset($_GET['test_session']))
2291     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2292         header('Location: '.index_url($_SERVER));
2293     }
2294
2295
2296     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2297     {
2298         $tz = 'UTC';
2299         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2300             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2301                 $tz = $_POST['continent'].'/'.$_POST['city'];
2302             }
2303         }
2304         $GLOBALS['timezone'] = $tz;
2305         // Everything is ok, let's create config file.
2306         $GLOBALS['login'] = $_POST['setlogin'];
2307         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2308         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2309         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2310         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2311         try {
2312             writeConfig($GLOBALS, isLoggedIn());
2313         }
2314         catch(Exception $e) {
2315             error_log(
2316                     'ERROR while writing config file after installation.' . PHP_EOL .
2317                     $e->getMessage()
2318                 );
2319
2320             // TODO: do not handle exceptions/errors in JS.
2321             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2322             exit;
2323         }
2324         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2325         exit;
2326     }
2327
2328     // Display config form:
2329     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2330     $timezone_html = '';
2331     if ($timezone_form != '') {
2332         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2333     }
2334
2335     $PAGE = new pageBuilder;
2336     $PAGE->assign('timezone_html',$timezone_html);
2337     $PAGE->assign('timezone_js',$timezone_js);
2338     $PAGE->renderPage('install');
2339     exit;
2340 }
2341
2342 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2343    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2344    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2345    This function is called by passing the URL:
2346    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2347    [URL] is the URL of the link (e.g. a flickr page)
2348    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2349    The function below will fetch the image from the webservice and store it in the cache.
2350 */
2351 function genThumbnail()
2352 {
2353     // Make sure the parameters in the URL were generated by us.
2354     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2355     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2356
2357     // Let's see if we don't already have the image for this URL in the cache.
2358     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2359     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2360     {   // We have the thumbnail, just serve it:
2361         header('Content-Type: image/jpeg');
2362         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2363         return;
2364     }
2365     // We may also serve a blank image (if service did not respond)
2366     $blankname=hash('sha1',$_GET['url']).'.gif';
2367     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2368     {
2369         header('Content-Type: image/gif');
2370         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2371         return;
2372     }
2373
2374     // Otherwise, generate the thumbnail.
2375     $url = $_GET['url'];
2376     $domain = parse_url($url,PHP_URL_HOST);
2377
2378     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2379     {
2380         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2381         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2382
2383         // Is this a link to an image, or to a flickr page ?
2384         $imageurl='';
2385         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2386         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2387             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2388             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2389         }
2390         else // This is a flickr page (html)
2391         {
2392             // Get the flickr html page.
2393             list($headers, $content) = get_http_response($url, 20);
2394             if (strpos($headers[0], '200 OK') !== false)
2395             {
2396                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2397                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2398                 if (!empty($matches[1])) $imageurl=$matches[1];
2399
2400                 // In albums (and some other pages), the link rel="image_src" is not provided,
2401                 // but flickr provides:
2402                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2403                 if ($imageurl=='')
2404                 {
2405                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2406                     if (!empty($matches[1])) $imageurl=$matches[1];
2407                 }
2408             }
2409         }
2410
2411         if ($imageurl!='')
2412         {   // Let's download the image.
2413             // Image is 240x120, so 10 seconds to download should be enough.
2414             list($headers, $content) = get_http_response($imageurl, 10);
2415             if (strpos($headers[0], '200 OK') !== false) {
2416                 // Save image to cache.
2417                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/' . $thumbname, $content);
2418                 header('Content-Type: image/jpeg');
2419                 echo $content;
2420                 return;
2421             }
2422         }
2423     }
2424
2425     elseif ($domain=='vimeo.com' )
2426     {
2427         // This is more complex: we have to perform a HTTP request, then parse the result.
2428         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2429         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2430         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2431         if (strpos($headers[0], '200 OK') !== false) {
2432             $t = unserialize($content);
2433             $imageurl = $t[0]['thumbnail_medium'];
2434             // Then we download the image and serve it to our client.
2435             list($headers, $content) = get_http_response($imageurl, 10);
2436             if (strpos($headers[0], '200 OK') !== false) {
2437                 // Save image to cache.
2438                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2439                 header('Content-Type: image/jpeg');
2440                 echo $content;
2441                 return;
2442             }
2443         }
2444     }
2445
2446     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2447     {
2448         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2449         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2450         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2451         list($headers, $content) = get_http_response($url, 5);
2452         if (strpos($headers[0], '200 OK') !== false) {
2453             // Extract the link to the thumbnail
2454             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2455             if (!empty($matches[1]))
2456             {   // Let's download the image.
2457                 $imageurl=$matches[1];
2458                 // No control on image size, so wait long enough
2459                 list($headers, $content) = get_http_response($imageurl, 20);
2460                 if (strpos($headers[0], '200 OK') !== false) {
2461                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2462                     file_put_contents($filepath, $content); // Save image to cache.
2463                     if (resizeImage($filepath))
2464                     {
2465                         header('Content-Type: image/jpeg');
2466                         echo file_get_contents($filepath);
2467                         return;
2468                     }
2469                 }
2470             }
2471         }
2472     }
2473
2474     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2475     {
2476         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2477         // http://xkcd.com/327/
2478         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2479         list($headers, $content) = get_http_response($url, 5);
2480         if (strpos($headers[0], '200 OK') !== false) {
2481             // Extract the link to the thumbnail
2482             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2483             if (!empty($matches[1]))
2484             {   // Let's download the image.
2485                 $imageurl=$matches[1];
2486                 // No control on image size, so wait long enough
2487                 list($headers, $content) = get_http_response($imageurl, 20);
2488                 if (strpos($headers[0], '200 OK') !== false) {
2489                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2490                     // Save image to cache.
2491                     file_put_contents($filepath, $content);
2492                     if (resizeImage($filepath))
2493                     {
2494                         header('Content-Type: image/jpeg');
2495                         echo file_get_contents($filepath);
2496                         return;
2497                     }
2498                 }
2499             }
2500         }
2501     }
2502
2503     else
2504     {
2505         // For all other domains, we try to download the image and make a thumbnail.
2506         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2507         list($headers, $content) = get_http_response($url, 30);
2508         if (strpos($headers[0], '200 OK') !== false) {
2509             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2510             // Save image to cache.
2511             file_put_contents($filepath, $content);
2512             if (resizeImage($filepath))
2513             {
2514                 header('Content-Type: image/jpeg');
2515                 echo file_get_contents($filepath);
2516                 return;
2517             }
2518         }
2519     }
2520
2521
2522     // Otherwise, return an empty image (8x8 transparent gif)
2523     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2524     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2525     header('Content-Type: image/gif');
2526     echo $blankgif;
2527 }
2528
2529 // Make a thumbnail of the image (to width: 120 pixels)
2530 // Returns true if success, false otherwise.
2531 function resizeImage($filepath)
2532 {
2533     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2534
2535     // Trick: some stupid people rename GIF as JPEG... or else.
2536     // So we really try to open each image type whatever the extension is.
2537     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2538     $im=false;
2539     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2540     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2541     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2542     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2543     $w = imagesx($im);
2544     $h = imagesy($im);
2545     $ystart = 0; $yheight=$h;
2546     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2547     $nw = 120;   // Desired width
2548     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2549     // Resize image:
2550     $im2 = imagecreatetruecolor($nw,$nh);
2551     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2552     imageinterlace($im2,true); // For progressive JPEG.
2553     $tempname=$filepath.'_TEMP.jpg';
2554     imagejpeg($im2, $tempname, 90);
2555     imagedestroy($im);
2556     imagedestroy($im2);
2557     unlink($filepath);
2558     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2559     return true;
2560 }
2561
2562 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2563 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2564 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2565 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2566 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2567 renderPage();
2568 ?>