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<?php
date_default_timezone_set('UTC'); // Some machines don’t have this set so just do it here.

class DUPX_CSRF {
	
	/** Session var name
	 * @var string
	 */
	public static $prefix = '_DUPX_CSRF';
	
	/** Generate DUPX_CSRF value for form
	 * @param	string	$form	- Form name as session key
	 * @return	string	- token
	 */
	public static function generate($form = NULL) {
		if (!empty($_COOKIE[DUPX_CSRF::$prefix . '_' . $form])) {
			$token = $_COOKIE[DUPX_CSRF::$prefix . '_' . $form];
		} else {
            $token = DUPX_CSRF::token() . DUPX_CSRF::fingerprint();
		}
		$cookieName = DUPX_CSRF::$prefix . '_' . $form;
        $ret = DUPX_CSRF::setCookie($cookieName, $token);
		return $token;
	}
	
	/** Check DUPX_CSRF value of form
	 * @param	string	$token	- Token
	 * @param	string	$form	- Form name as session key
	 * @return	boolean
	 */
	public static function check($token, $form = NULL) {
		if (!self::isCookieEnabled()) {
			return true;
		}
		if (isset($_COOKIE[DUPX_CSRF::$prefix . '_' . $form]) && $_COOKIE[DUPX_CSRF::$prefix . '_' . $form] == $token) { // token OK
			return (substr($token, -32) == DUPX_CSRF::fingerprint()); // fingerprint OK?
		}
		return FALSE;
	}
	
	/** Generate token
	 * @param	void
	 * @return  string
	 */
	protected static function token() {
		mt_srand((double) microtime() * 10000);
		$charid = strtoupper(md5(uniqid(rand(), TRUE)));
		return substr($charid, 0, 8) . substr($charid, 8, 4) . substr($charid, 12, 4) . substr($charid, 16, 4) . substr($charid, 20, 12);
	}
	
	/** Returns "digital fingerprint" of user
	 * @param 	void
	 * @return 	string 	- MD5 hashed data
	 */
	protected static function fingerprint() {
		return strtoupper(md5(implode('|', array($_SERVER['REMOTE_ADDR'], $_SERVER['HTTP_USER_AGENT']))));
	}

public static function setCookie($cookieName, $cookieVal) {
		$_COOKIE[$cookieName] = $cookieVal;
		return setcookie($cookieName, $cookieVal, time() + 10800, '/');
	}
	
	/**
	* @return bool
	*/
	protected static function isCookieEnabled() {
		return (count($_COOKIE) > 0);
	}

public static function resetAllTokens() {
		foreach ($_COOKIE as $cookieName => $cookieVal) {
			$step1Key = DUPX_CSRF::$prefix . '_step1';
			if ($step1Key != $cookieName && (0 === strpos($cookieName, DUPX_CSRF::$prefix) || 'archive' == $cookieName || 'bootloader' == $cookieName)) {
				setcookie($cookieName, '', time() - 86400, '/');
				unset($_COOKIE[$cookieName]);
			}
		}
	}
}

/**
 * Bootstrap utility to exatract the core installer
 *
 * Standard: PSR-2
 *
 * @package SC\DUPX\Bootstrap
 * @link http://www.php-fig.org/psr/psr-2/
 *
 *  To force extraction mode:
 *		installer.php?unzipmode=auto
 *		installer.php?unzipmode=ziparchive
 *		installer.php?unzipmode=shellexec
 */

abstract class DUPX_Bootstrap_Zip_Mode
{
	const AutoUnzip		= 0;
	const ZipArchive	= 1;
	const ShellExec		= 2;
}

abstract class DUPX_Connectivity
{
	const OK		= 0;
	const Error		= 1;
	const Unknown	= 2;
}

class DUPX_Bootstrap
{
	//@@ Params get dynamically swapped when package is built
	const ARCHIVE_FILENAME	 = '@@ARCHIVE@@';
	const ARCHIVE_SIZE		 = '@@ARCHIVE_SIZE@@';
	const INSTALLER_DIR_NAME = 'dup-installer';
	const PACKAGE_HASH		 = '@@PACKAGE_HASH@@';
	const VERSION			 = '@@VERSION@@';

public $hasZipArchive     = false;
	public $hasShellExecUnzip = false;
	public $mainInstallerURL;
	public $installerContentsPath;
	public $installerExtractPath;
	public $archiveExpectedSize = 0;
	public $archiveActualSize = 0;
	public $activeRatio = 0;

/**
	 * Instantiate the Bootstrap Object
	 *
	 * @return null
	 */
	public function __construct()
	{
		//ARCHIVE_SIZE will be blank with a root filter so we can estimate
		//the default size of the package around 17.5MB (18088000)
		$archiveActualSize		        = @filesize(self::ARCHIVE_FILENAME);
		$archiveActualSize				= ($archiveActualSize !== false) ? $archiveActualSize : 0;
		$this->hasZipArchive			= class_exists('ZipArchive');
		$this->hasShellExecUnzip		= $this->getUnzipFilePath() != null ? true : false;
		$this->installerContentsPath	= str_replace("\\", '/', (dirname(__FILE__). '/' .self::INSTALLER_DIR_NAME));
		$this->installerExtractPath		= str_replace("\\", '/', (dirname(__FILE__)));
		$this->archiveExpectedSize      = strlen(self::ARCHIVE_SIZE) ?  self::ARCHIVE_SIZE : 0 ;
		$this->archiveActualSize        = $archiveActualSize;

if($this->archiveExpectedSize > 0) {
            $this->archiveRatio			= (((1.0) * $this->archiveActualSize)  / $this->archiveExpectedSize) * 100;
        } else {
            $this->archiveRatio			= 100;
        }

$this->overwriteMode = (isset($_GET['mode']) && ($_GET['mode'] == 'overwrite'));
	}

/**
	 * Run the bootstrap process which includes checking for requirements and running
	 * the extraction process
	 *
	 * @return null | string	Returns null if the run was successful otherwise an error message
	 */
	public function run()
	{
		date_default_timezone_set('UTC'); // Some machines don't have this set so just do it here
		@unlink('./dup-installer-bootlog__'.self::PACKAGE_HASH.'.txt');
		self::log('==DUPLICATOR INSTALLER BOOTSTRAP v@@VERSION@@==');
		self::log('----------------------------------------------------');
		self::log('Installer bootstrap start');

$archive_filepath	 = $this->getArchiveFilePath();
		$archive_filename	 = self::ARCHIVE_FILENAME;

$error					= null;
		$extract_installer		= true;
		$installer_directory	= dirname(__FILE__).'/'.self::INSTALLER_DIR_NAME;
		$extract_success		= false;
		$archiveExpectedEasy	= $this->readableByteSize($this->archiveExpectedSize);
		$archiveActualEasy		= $this->readableByteSize($this->archiveActualSize);

//$archive_extension = strtolower(pathinfo($archive_filepath)['extension']);
        $archive_extension		= strtolower(pathinfo($archive_filepath, PATHINFO_EXTENSION));
		$manual_extract_found   = file_exists($installer_directory."/main.installer.php");

$isZip = ($archive_extension == 'zip');

//MANUAL EXTRACTION NOT FOUND
		if (! $manual_extract_found) {

//MISSING ARCHIVE FILE
			if (! file_exists($archive_filepath)) {
				self::log("ERROR: Archive file not found!");
				$archive_candidates = ($isZip) ? $this->getFilesWithExtension('zip') : $this->getFilesWithExtension('daf');
				$candidate_count = count($archive_candidates);
				$candidate_html  = "- No {$archive_extension} files found -";

if ($candidate_count >= 1) {
					$candidate_html = "<ol>";
					foreach($archive_candidates as $archive_candidate) {
						$candidate_html .=  "<li> {$archive_candidate}</li>";
					}
				   $candidate_html .=  "</ol>";
				}

$error  = "<b>Archive not found!</b> The <i>'Required File'</i> below should be present in the <i>'Extraction Path'</i>.  "
					. "The archive file name must be the <u>exact</u> name of the archive file placed in the extraction path character for character.<br/><br/>  "
					. "If the file does not have the correct name then rename it to the <i>'Required File'</i> below.   When downloading the package files make "
					. "sure both files are from the same package line in the packages view.  If the archive is not finished downloading please wait for it to complete.<br/><br/>"
					. "<b>Required File:</b>  <span class='file-info'>{$archive_filename}</span> <br/>"
					. "<b>Extraction Path:</b> <span class='file-info'>{$this->installerExtractPath}/</span><br/><br/>"
					. "Potential archives found at extraction path: <br/>{$candidate_html}<br/><br/>";

return $error;
			}

//SIZE CHECK ERROR
			if (($this->archiveRatio < 90) && ($this->archiveActualSize > 0) && ($this->archiveExpectedSize > 0)) {
				$this->log("ERROR: The expected archive size should be around [{$archiveExpectedEasy}].  The actual size is currently [{$archiveActualEasy}].");
				$this->log("The archive file may not have fully been downloaded to the server");
				$percent = round($this->archiveRatio);

$autochecked = isset($_POST['auto-fresh']) ? "checked='true'" : '';
				$error  = "<b>Archive file size warning.</b><br/> The expected archive size should be around <b class='pass'>[{$archiveExpectedEasy}]</b>.  "
					. "The actual size is currently <b class='fail'>[{$archiveActualEasy}]</b>.  The archive file may not have fully been downloaded to the server.  "
					. "Please validate that the file sizes are close to the same size and that the file has been completely downloaded to the destination server.  If the archive is still "
					. "downloading then refresh this page to get an update on the download size.<br/><br/>";

return $error;
			}

}

// INSTALL DIRECTORY: Check if its setup correctly AND we are not in overwrite mode
		// disable extract installer mode by passing GET var like installer.php?extract-installer=0 or installer.php?extract-installer=disable
        if ((isset($_GET['extract-installer']) && ('0' == $_GET['extract-installer'] || 'disable' == $_GET['extract-installer'] || 'false' == $_GET['extract-installer'])) && file_exists($installer_directory)) {
//RSR for testing        if (file_exists($installer_directory)) {

self::log("$installer_directory already exists");
			$extract_installer = !file_exists($installer_directory."/main.installer.php");

($extract_installer)
				? self::log("But main.installer.php doesn't so extracting anyway")
				: self::log("main.installer.php also exists so not going to extract installer directory");

} else {
			self::log("Going to overwrite installer directory since either in overwrite mode or installer directory doesn't exist");
		}

if ($extract_installer && file_exists($installer_directory)) {
			$scanned_directory = array_diff(scandir($installer_directory), array('..', '.'));
			foreach ($scanned_directory as $object) {
				$object_file_path = $installer_directory.'/'.$object;
				if (is_file($object_file_path)) {
					if (unlink($object_file_path)) {
						self::log('Successfully deleted the file '.$object_file_path);
					} else {
						$error .= 'Error deleting the file '.$object_file_path.' Please manually delete it and try again.';
						self::log($error);
					}
				}
			}
		}

//ATTEMPT EXTRACTION:
		//ZipArchive and Shell Exec
		if ($extract_installer) {

self::log("Ready to extract the installer");

if ($isZip) {
				$zip_mode = $this->getZipMode();

if (($zip_mode == DUPX_Bootstrap_Zip_Mode::AutoUnzip) || ($zip_mode == DUPX_Bootstrap_Zip_Mode::ZipArchive) && class_exists('ZipArchive')) {
					if ($this->hasZipArchive) {
						self::log("ZipArchive exists so using that");
						$extract_success = $this->extractInstallerZipArchive($archive_filepath);

if ($extract_success) {
							self::log('Successfully extracted with ZipArchive');
						} else {
							$error = 'Error extracting with ZipArchive. ';
							self::log($error);
						}
					} else {
						self::log("WARNING: ZipArchive is not enabled.");
						$error	 = "NOTICE: ZipArchive is not enabled on this server please talk to your host or server admin about enabling ";
						$error	 .= "<a target='_blank' href='https://snapcreek.com/duplicator/docs/faqs-tech/#faq-trouble-060-q'>ZipArchive</a> on this server. <br/>";
					}
				}

if (!$extract_success) {
					if (($zip_mode == DUPX_Bootstrap_Zip_Mode::AutoUnzip) || ($zip_mode == DUPX_Bootstrap_Zip_Mode::ShellExec)) {
						$unzip_filepath = $this->getUnzipFilePath();
						if ($unzip_filepath != null) {
							$extract_success = $this->extractInstallerShellexec($archive_filepath);
							if ($extract_success) {
								self::log('Successfully extracted with Shell Exec');
								$error = null;
							} else {
								$error .= 'Error extracting with Shell Exec. Please manually extract archive then choose Advanced > Manual Extract in installer.';
								self::log($error);
							}
						} else {
							self::log('WARNING: Shell Exec Zip is not available');
							$error	 .= "NOTICE: Shell Exec is not enabled on this server please talk to your host or server admin about enabling ";
							$error	 .= "<a target='_blank' href='http://php.net/manual/en/function.shell-exec.php'>Shell Exec</a> on this server or manually extract archive then choose Advanced > Manual Extract in installer.";
						}
					}
				}
			} else {
				DupArchiveMiniExpander::init("DUPX_Bootstrap::log");
				try {
					DupArchiveMiniExpander::expandDirectory($archive_filepath, self::INSTALLER_DIR_NAME, dirname(__FILE__));
				} catch (Exception $ex) {
					self::log("Error expanding installer subdirectory:".$ex->getMessage());
					throw $ex;
				}
			}
		} else {
			self::log("Didn't need to extract the installer.");
		}

$config_files = glob('./dup-installer/dup-archive__*.txt');
		$config_file_absolute_path = array_pop($config_files);
		if (!file_exists($config_file_absolute_path)) {
			$error = '<b>Archive config file not found in dup-installer folder.</b> <br><br>';
			return $error;
		}
		
		$is_https = $this->isHttps();

if($is_https) {
			$current_url = 'https://';
		} else {
			$current_url = 'http://';
		}

if(($_SERVER['SERVER_PORT'] == 80) && ($is_https)) {
			// Fixing what appears to be a bad server setting
			$server_port = 443;
		} else {
			$server_port = $_SERVER['SERVER_PORT'];
		}

//$current_url .= $_SERVER['HTTP_HOST'];//WAS SERVER_NAME and caused problems on some boxes
		$current_url .= isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME'];//WAS SERVER_NAME and caused problems on some boxes
		if(strpos($current_url,':') === false) {
                   $current_url = $current_url.':'.$server_port;
                }
                
		$current_url .= $_SERVER['REQUEST_URI'];
		$uri_start    = dirname($current_url);

$encoded_archive_path = urlencode($archive_filepath);

if ($error === null) {
                    $error = $this->postExtractProcessing();

if($error == null) {

$bootloader_name	 = basename(__FILE__);
                        $this->mainInstallerURL = $uri_start.'/'.self::INSTALLER_DIR_NAME.'/main.installer.php';

$this->fixInstallerPerms($this->mainInstallerURL);

$this->archive = $archive_filepath;
						$this->bootloader = $bootloader_name;

if (isset($_SERVER['QUERY_STRING']) && !empty($_SERVER['QUERY_STRING'])) {
                                $this->mainInstallerURL .= '?'.$_SERVER['QUERY_STRING'];
                        }

self::log("No detected errors so redirecting to the main installer. Main Installer URI = {$this->mainInstallerURL}");
                    }
                }

return $error;
	}

public function postExtractProcessing()
	{
		$dproInstallerDir = dirname(__FILE__) . '/dup-installer';
		$libDir = $dproInstallerDir . '/lib';
		$fileopsDir = $libDir . '/fileops';

$sourceFilepath = "{$fileopsDir}/fileops.ppp";
		$destFilepath = "{$fileopsDir}/fileops.php";

if(file_exists($sourceFilepath) && (!file_exists($destFilepath))) {
			if(@rename($sourceFilepath, $destFilepath) === false) {
				return "Error renaming {$sourceFilepath}";
			}
		}
	}

/**
     * Indicates if site is running https or not
     *
     * @return bool  Returns true if https, false if not
     */
	public function isHttps()
	{
		$retVal = true;

if (isset($_SERVER['HTTPS'])) {
			$retVal = ($_SERVER['HTTPS'] !== 'off');
		} else {
			$retVal = ($_SERVER['SERVER_PORT'] == 443);
            }

return $retVal;
	}

/**
     *  Attempts to set the 'dup-installer' directory permissions
     *
     * @return null
     */
	private function fixInstallerPerms()
	{
		$file_perms = substr(sprintf('%o', fileperms(__FILE__)), -4);
		$file_perms = octdec($file_perms);
		//$dir_perms = substr(sprintf('%o', fileperms(dirname(__FILE__))), -4);

// No longer using existing directory permissions since that can cause problems.  Just set it to 755
		$dir_perms = '755';
		$dir_perms = octdec($dir_perms);
		$installer_dir_path = $this->installerContentsPath;

$this->setPerms($installer_dir_path, $dir_perms, false);
		$this->setPerms($installer_dir_path, $file_perms, true);
	}

/**
     * Set the permissions of a given directory and optionally all files
     *
     * @param string $directory		The full path to the directory where perms will be set
     * @param string $perms			The given permission sets to use such as '0755'
	 * @param string $do_files		Also set the permissions of all the files in the directory
     *
     * @return null
     */
	private function setPerms($directory, $perms, $do_files)
	{
		if (!$do_files) {
			// If setting a directory hiearchy be sure to include the base directory
			$this->setPermsOnItem($directory, $perms);
		}

$item_names = array_diff(scandir($directory), array('.', '..'));

foreach ($item_names as $item_name) {
			$path = "$directory/$item_name";
			if (($do_files && is_file($path)) || (!$do_files && !is_file($path))) {
				$this->setPermsOnItem($path, $perms);
			}
		}
	}

/**
     * Set the permissions of a single directory or file
     *
     * @param string $path			The full path to the directory or file where perms will be set
     * @param string $perms			The given permission sets to use such as '0755'
     *
     * @return bool		Returns true if the permission was properly set
     */
	private function setPermsOnItem($path, $perms)
	{
		$result = @chmod($path, $perms);
		$perms_display = decoct($perms);
		if ($result === false) {
			self::log("Couldn't set permissions of $path to {$perms_display}<br/>");
		} else {
			self::log("Set permissions of $path to {$perms_display}<br/>");
		}
		return $result;
	}

/**
     * Logs a string to the dup-installer-bootlog__[HASH].txt file
     *
     * @param string $s			The string to log to the log file
     *
     * @return null
     */
	public static function log($s)
	{
		$timestamp = date('M j H:i:s');
		file_put_contents('./dup-installer-bootlog__'.self::PACKAGE_HASH.'.txt', "$timestamp $s\n", FILE_APPEND);
	}

/**
     * Extracts only the 'dup-installer' files using ZipArchive
     *
     * @param string $archive_filepath	The path to the archive file.
     *
     * @return bool		Returns true if the data was properly extracted
     */
	private function extractInstallerZipArchive($archive_filepath)
	{
		$success	 = true;
		$zipArchive	 = new ZipArchive();

if ($zipArchive->open($archive_filepath) === true) {
			self::log("Successfully opened $archive_filepath");
			$destination = dirname(__FILE__);
			$folder_prefix = self::INSTALLER_DIR_NAME.'/';
			self::log("Extracting all files from archive within ".self::INSTALLER_DIR_NAME);

$installer_files_found = 0;

for ($i = 0; $i < $zipArchive->numFiles; $i++) {
				$stat		 = $zipArchive->statIndex($i);
				$filename	 = $stat['name'];

if ($this->startsWith($filename, $folder_prefix)) {
					$installer_files_found++;

$lib_directory = dirname(__FILE__).'/'.self::INSTALLER_DIR_NAME.'/lib';
            $snaplib_directory = $lib_directory.'/snaplib';

// If snaplib files aren't present attempt to extract and copy those
            if(!file_exists($snaplib_directory))
            {
                $folder_prefix = 'snaplib/';
                $destination = $lib_directory;

for ($i = 0; $i < $zipArchive->numFiles; $i++) {
                    $stat		 = $zipArchive->statIndex($i);
                    $filename	 = $stat['name'];

if ($this->startsWith($filename, $folder_prefix)) {
                        $installer_files_found++;

if ($zipArchive->extractTo($destination, $filename) === true) {
                            self::log("Success: {$filename} >>> {$destination}");
                        } else {
                            self::log("Error extracting {$filename} from archive archive file");
                            $success = false;
                            break;
                        }
                    }
                }
            }

if ($zipArchive->close() === true) {
				self::log("Successfully closed archive file");
			} else {
				self::log("Problem closing archive file");
				$success = false;
			}

if ($installer_files_found < 10) {
				self::log("Couldn't find the installer directory in the archive!");

$success = false;
			}
		} else {
			self::log("Couldn't open archive archive file with ZipArchive");
			$success = false;
		}
		return $success;
	}

/**
     * Extracts only the 'dup-installer' files using Shell-Exec Unzip
     *
     * @param string $archive_filepath	The path to the archive file.
     *
     * @return bool		Returns true if the data was properly extracted
     */
	private function extractInstallerShellexec($archive_filepath)
	{
		$success = false;
		self::log("Attempting to use Shell Exec");
		$unzip_filepath	 = $this->getUnzipFilePath();

if ($unzip_filepath != null) {
			$unzip_command	 = "$unzip_filepath -q $archive_filepath ".self::INSTALLER_DIR_NAME.'/* 2>&1';
			self::log("Executing $unzip_command");
			$stderr	 = shell_exec($unzip_command);

$lib_directory = dirname(__FILE__).'/'.self::INSTALLER_DIR_NAME.'/lib';
            $snaplib_directory = $lib_directory.'/snaplib';

// If snaplib files aren't present attempt to extract and copy those
            if(!file_exists($snaplib_directory))
            {
                $local_lib_directory = dirname(__FILE__).'/snaplib';
                $unzip_command	 = "$unzip_filepath -q $archive_filepath snaplib/* 2>&1";
                self::log("Executing $unzip_command");
                $stderr	 .= shell_exec($unzip_command);
				mkdir($lib_directory);
                rename($local_lib_directory, $snaplib_directory);
            }

if ($stderr == '') {
				self::log("Shell exec unzip succeeded");
				$success = true;
			} else {
				self::log("Shell exec unzip failed. Output={$stderr}");
			}
		}

return $success;
	}

/**
     * Attempts to get the archive file path
     *
     * @return string	The full path to the archive file
     */
	private function getArchiveFilePath()
	{
		if (isset($_GET['archive'])) {
			$archive_filepath = $_GET['archive'];
		} else {
		$archive_filename = self::ARCHIVE_FILENAME;
			$archive_filepath = str_replace("\\", '/', dirname(__FILE__) . '/' . $archive_filename);
		}

self::log("Using archive $archive_filepath");
		return $archive_filepath;
	}

/**
     * Gets the DUPX_Bootstrap_Zip_Mode enum type that should be used
     *
     * @return DUPX_Bootstrap_Zip_Mode	Returns the current mode of the bootstrapper
     */
	private function getZipMode()
	{
		$zip_mode = DUPX_Bootstrap_Zip_Mode::AutoUnzip;

if (isset($_GET['zipmode'])) {
			$zipmode_string = $_GET['zipmode'];
			self::log("Unzip mode specified in querystring: $zipmode_string");

switch ($zipmode_string) {
				case 'autounzip':
					$zip_mode = DUPX_Bootstrap_Zip_Mode::AutoUnzip;
					break;

case 'ziparchive':
					$zip_mode = DUPX_Bootstrap_Zip_Mode::ZipArchive;
					break;

case 'shellexec':
					$zip_mode = DUPX_Bootstrap_Zip_Mode::ShellExec;
					break;
			}
		}

return $zip_mode;
	}

/**
     * Checks to see if a string starts with specific characters
     *
     * @return bool		Returns true if the string starts with a specific format
     */
	private function startsWith($haystack, $needle)
	{
		return $needle === "" || strrpos($haystack, $needle, - strlen($haystack)) !== false;
	}

/**
     * Checks to see if the server supports issuing commands to shell_exex
     *
     * @return bool		Returns true shell_exec can be ran on this server
     */
	public function hasShellExec()
	{
		$cmds = array('shell_exec', 'escapeshellarg', 'escapeshellcmd', 'extension_loaded');

//Function disabled at server level
		if (array_intersect($cmds, array_map('trim', explode(',', @ini_get('disable_functions'))))) return false;

//Suhosin: http://www.hardened-php.net/suhosin/
		//Will cause PHP to silently fail
		if (extension_loaded('suhosin')) {
			$suhosin_ini = @ini_get("suhosin.executor.func.blacklist");
			if (array_intersect($cmds, array_map('trim', explode(',', $suhosin_ini)))) return false;
		}
		// Can we issue a simple echo command?
		if (!@shell_exec('echo duplicator')) return false;

return true;
	}

/**
     * Gets the possible system commands for unzip on Linux
     *
     * @return string		Returns unzip file path that can execute the unzip command
     */
	public function getUnzipFilePath()
	{
		$filepath = null;

if ($this->hasShellExec()) {
			if (shell_exec('hash unzip 2>&1') == NULL) {
				$filepath = 'unzip';
			} else {
				$possible_paths = array(
					'/usr/bin/unzip',
					'/opt/local/bin/unzip'// RSR TODO put back in when we support shellexec on windows,
				);

foreach ($possible_paths as $path) {
					if (file_exists($path)) {
						$filepath = $path;
						break;
					}
				}
			}
		}

return $filepath;
	}

/**
	 * Display human readable byte sizes such as 150MB
	 *
	 * @param int $size		The size in bytes
	 *
	 * @return string A readable byte size format such as 100MB
	 */
	public function readableByteSize($size)
	{
		try {
			$units = array('B', 'KB', 'MB', 'GB', 'TB');
			for ($i = 0; $size >= 1024 && $i < 4; $i++)
				$size /= 1024;
			return round($size, 2).$units[$i];
		} catch (Exception $e) {
			return "n/a";
		}
	}

/**
     *  Returns an array of zip files found in the current executing directory
     *
     *  @return array of zip files
     */
    public static function getFilesWithExtension($extension)
    {
        $files = array();
        foreach (glob("*.{$extension}") as $name) {
            if (file_exists($name)) {
                $files[] = $name;
            }
        }

if (count($files) > 0) {
            return $files;
        }

//FALL BACK: Windows XP has bug with glob,
        //add secondary check for PHP lameness
        if ($dh = opendir('.')) {
            while (false !== ($name = readdir($dh))) {
                $ext = substr($name, strrpos($name, '.') + 1);
                if (in_array($ext, array($extension))) {
                    $files[] = $name;
                }
            }
            closedir($dh);
        }

return $files;
    }
}

$boot  = new DUPX_Bootstrap();
$boot_error = $boot->run();
$auto_refresh = isset($_POST['auto-fresh']) ? true : false;
DUPX_CSRF::resetAllTokens();

if ($boot_error == null) {
	$step1_csrf_token = DUPX_CSRF::generate('step1');
	DUPX_CSRF::setCookie('archive', $boot->archive);
	DUPX_CSRF::setCookie('bootloader', $boot->bootloader);
}
?>

<html>
<?php if ($boot_error == null) :?>
	<head>
		<meta name="robots" content="noindex,nofollow">
		<title>Duplicator Installer</title>
	</head>
	<body>
		<?php
		$id = uniqid();
		$html = "<form id='{$id}' method='post' action='{$boot->mainInstallerURL}' />\n";
		$data = array(
			'archive' => $boot->archive,
			'bootloader' => $boot->bootloader,
			'csrf_token' => $step1_csrf_token,
		);
		foreach ($data as $name => $value) {			
			$html .= "<input type='hidden' name='{$name}' value='{$value}' />\n";
		}
		$html .= "</form>\n";
		$html .= "<script>window.onload = function() { document.getElementById('{$id}').submit(); }</script>";
		echo $html;
		?>
	</body>
<?php else :?>
	<head>
		<style>
			body {font-family:Verdana,Arial,sans-serif; line-height:18px; font-size: 12px}
			h2 {font-size:20px; margin:5px 0 5px 0; border-bottom:1px solid #dfdfdf; padding:3px}
			div#content {border:1px solid #CDCDCD; width:750px; min-height:550px; margin:auto; margin-top:18px; border-radius:5px; box-shadow:0 8px 6px -6px #333; font-size:13px}
			div#content-inner {padding:10px 30px; min-height:550px}

/* Header */
			table.header-wizard {border-top-left-radius:5px; border-top-right-radius:5px; width:100%; box-shadow:0 5px 3px -3px #999; background-color:#F1F1F1; font-weight:bold}
			table.header-wizard td.header {font-size:24px; padding:7px 0 7px 0; width:100%;}
			div.dupx-logfile-link {float:right; font-weight:normal; font-size:12px}
			.dupx-version {white-space:nowrap; color:#999; font-size:11px; font-style:italic; text-align:right;  padding:0 15px 5px 0; line-height:14px; font-weight:normal}
			.dupx-version a { color:#999; }

div.errror-notice {text-align:center; font-style:italic; font-size:11px}
			div.errror-msg { color:maroon; padding: 10px 0 5px 0}
			.pass {color:green}
			.fail {color:red}
			span.file-info {font-size: 11px; font-style: italic}
			div.skip-not-found {padding:10px 0 5px 0;}
			div.skip-not-found label {cursor: pointer}
			table.settings {width:100%; font-size:12px}
			table.settings td {padding: 4px}
			table.settings td:first-child {font-weight: bold}
			.w3-light-grey,.w3-hover-light-grey:hover,.w3-light-gray,.w3-hover-light-gray:hover{color:#000!important;background-color:#f1f1f1!important}
			.w3-container:after,.w3-container:before,.w3-panel:after,.w3-panel:before,.w3-row:after,.w3-row:before,.w3-row-padding:after,.w3-row-padding:before,
			.w3-cell-row:before,.w3-cell-row:after,.w3-clear:after,.w3-clear:before,.w3-bar:before,.w3-bar:after
			{content:"";display:table;clear:both}
			.w3-green,.w3-hover-green:hover{color:#fff!important;background-color:#4CAF50!important}
			.w3-container{padding:0.01em 16px}
			.w3-center{display:inline-block;width:auto; text-align: center !important}
		</style>
	</head>
	<body>
	<div id="content">

<table cellspacing="0" class="header-wizard">
			<tr>
				<td class="header"> &nbsp; Duplicator - Bootloader</td>
				<td class="dupx-version">
					version: <?php echo DUPX_Bootstrap::VERSION ?> <br/>
				</td>
			</tr>
		</table>

<form id="error-form" method="post">
		<div id="content-inner">
			<h2 style="color:maroon">Setup Notice:</h2>
			<div class="errror-notice">An error has occurred. In order to load the full installer please resolve the issue below.</div>
			<div class="errror-msg">
				<?php echo $boot_error ?>
			</div>
			<br/><br/>

<h2>Server Settings:</h2>
			<table class='settings'>
				<tr>
					<td>ZipArchive:</td>
					<td><?php echo $boot->hasZipArchive  ? '<i class="pass">Enabled</i>' : '<i class="fail">Disabled</i>'; ?> </td>
				</tr>
				<tr>
					<td>ShellExec&nbsp;Unzip:</td>
					<td><?php echo $boot->hasShellExecUnzip	? '<i class="pass">Enabled</i>' : '<i class="fail">Disabled</i>'; ?> </td>
				</tr>
				<tr>
					<td>Extraction&nbsp;Path:</td>
					<td><?php echo $boot->installerExtractPath; ?></td>
				</tr>
				<tr>
					<td>Installer Path:</td>
					<td><?php echo $boot->installerContentsPath; ?></td>
				</tr>
				<tr>
					<td>Archive Name:</td>
					<td>
						[HASH]_archive.zip or [HASH]_archive.daf<br/>
						<small>This is based on the format used to build the archive</small>
					</td>
				</tr>
				<tr>
					<td>Archive Size:</td>
					<td>
						<b>Expected Size:</b> <?php echo $boot->readableByteSize($boot->archiveExpectedSize); ?>  &nbsp;
						<b>Actual Size:</b>   <?php echo $boot->readableByteSize($boot->archiveActualSize); ?>
					</td>
				</tr>
				<tr>
					<td>Boot Log</td>
					<td>dup-installer-bootlog__[HASH].txt</td>
				</tr>
			</table>
			<br/><br/>

<div style="font-size:11px">
				Please Note: Either ZipArchive or Shell Exec will need to be enabled for the installer to run automatically otherwise a manual extraction
				will need to be performed.  In order to run the installer manually follow the instructions to
				<a href='https://snapcreek.com/duplicator/docs/faqs-tech/#faq-installer-015-q' target='_blank'>manually extract</a> before running the installer.
			</div>
			<br/><br/>

</div>
		</form>

</div>
	</body>

setTimeout(function(){window.location.reload(1);}, duration);
			setInterval(function() {
				counter--;
				countElement.innerHTML = (counter > 0) ? counter.toString() : "0";
			}, 1000);

<?php endif; ?>
	</script>

<?php endif; ?>

@@DUPARCHIVE_MINI_EXPANDER@@

</html>