<?php

interface IBXArchive
{
	const StatusError = 0;
	const StatusSuccess = 1;
	const StatusContinue = 2;

	public function Pack($arFileList, $startFile = "");
	public function Unpack($strPath);
	public function GetErrors();
	public function GetOptions();
	public function SetOptions($arOptions);
	public function GetStartFile();
}

class CBXArchive
{
	/**
	 * Creates an object of the archive
	 * @static
	 * @param string $strArcName full path to the archive file to be created
	 * @param string $strType one of the supported archive types (TAR.GZ, ZIP etc.)
	 * @return false | IBXArchive object of a specific class, false if type is not supported or path is incorrect
	 */
	public static function GetArchive($strArcName, $strType = "")
	{
		//at first trying to detect the archive type
		if ($strType == "")
		{
			$strType = self::DetectTypeByFilename($strArcName);

			if (!$strType)
			{
				$strType = "TAR.GZ";
			}
		}

		$arFormats = self::GetAvailableFormats();

		foreach ($arFormats as $type => $data)
		{
			if ($strType == $type)
			{
				$object = new $data["classname"]($strArcName);
				return $object;
			}
		}

		return false;
	}

	/**
	 * Finds the type of the archive by its filename
	 * @static
	 * @param string $filename full path to the file
	 * @return false|string $type code of the type if it's supported (TAR.GZ, ZIP), false if archive type is not found for the file
	 */
	public static function DetectTypeByFilename($filename)
	{
		$arFormats = self::GetAvailableFormats();
		$filename = mb_strtolower($filename);

		foreach ($arFormats as $type => $data)
		{
			if (in_array(GetFileExtension($filename), $data["ext"]))
			{
				return $type;
			}
		}
		return false;
	}

	/**
	 * Contains information about archives supported by the system
	 * @static
	 * @return array containing archive type code, classname, extensions, classpath for each type
	 */
	public static function GetAvailableFormats()
	{
		$arFormats = [
			"TAR.GZ" => [
				"classname" => "CArchiver",
				"ext" => ["gz", "tgz"],
			]
			,
			"ZIP" => [
				"classname" => "CZip",
				"ext" => ["zip"],
			]
		];

		return $arFormats;
	}

	/**
	 * Returns the array of file extensions which are considered as archives
	 * @static
	 * @return array containing extensions in lower case
	 */
	public static function GetArchiveExtensions()
	{
		$arFormats = self::GetAvailableFormats();
		$arExt = [];

		foreach ($arFormats as $data)
		{
			$arExt = array_merge($arExt, $data["ext"]);
		}
		return $arExt;
	}

	/**
	 * Checks if the file is archive of the suppoted type
	 * @static
	 * @param string $strFilename full path to the archive to be checked
	 * @return boolean
	 */
	public static function IsArchive($strFilename)
	{
		$strFileExt = mb_strtolower(GetFileExtension($strFilename));
		$arFormats = self::GetAvailableFormats();

		foreach ($arFormats as $data)
		{
			if (in_array($strFileExt, $data["ext"]))
			{
				return true;
			}
		}
		return false;
	}

	/**
	 * Checks if current user has access to the file or folder according to Bitrix permissions
	 * @static
	 * @param string $strFilename full path to the file
	 * @param boolean $isFile true if we check file permissions, false if folder permissions should be checked
	 * @return boolean
	 */
	public static function HasAccess($strFilename, $isFile)
	{
		$result = false;
		$path = removeDocRoot($strFilename);

		global $USER;

		if (!$isFile)
		{
			if ($USER->CanDoFileOperation("fm_view_listing", [SITE_ID, $path]))
			{
				$result = true;
			}
		}
		else
		{
			if ($USER->CanDoFileOperation('fm_view_file', [SITE_ID, $path]) &&
				($USER->CanDoOperation('edit_php') || $USER->CanDoFileOperation('fm_lpa', [SITE_ID, $path]) ||
					!(HasScriptExtension($path) || mb_substr(GetFileName($path), 0, 1) == ".")))
			{
				$result = true;
			}
		}
		return $result;
	}

	public static function IsFileSafe(string $filename): bool
	{
		$io = CBXVirtualIo::GetInstance();
		$logicalFilename = $io->GetLogicalName($filename);

		return
			!HasScriptExtension($filename)
			&& !IsFileUnsafe($filename)
			&& $io->ValidatePathString($logicalFilename)
			&& $io->ValidateFilenameString(GetFileName($logicalFilename))
		;
	}
}