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<?php

/**
 * MvcCore
 *
 * This source file is subject to the BSD 3 License
 * For the full copyright and license information, please view 
 * the LICENSE.md file that are distributed with this source code.
 *
 * @copyright   Copyright (c) 2016 Tom Flidr (https://github.com/mvccore)
 * @license     https://mvccore.github.io/docs/mvccore/5.0.0/LICENCE.md
 */

namespace MvcCore\Ext\Forms\Validators\Files\Validations\BombScanners;

class ZipArchive implements \MvcCore\Ext\Forms\Validators\Files\Validations\IBombScanner {

    const ERR_NO_ZIP_EXT = "System extension to detect dangerous ZIP archives is not installed.";
    
    /**
     * @var array
     */
    protected static $zipErrors = [
        \ZipArchive::ER_INCONS  => "Uploaded file is inconsistent ZIP archive (`{1}`).",
        \ZipArchive::ER_MEMORY  => "Uploaded file caused memory allocation failure (`{1}`).",
        \ZipArchive::ER_NOZIP   => "Uploaded file has archive header but it's not an archive (`{1}`).",
        \ZipArchive::ER_OPEN    => "Uploaded file archive is not possible to open (`{1}`).",
        \ZipArchive::ER_READ    => "Uploaded file archive is not possible to read (`{1}`).",
        \ZipArchive::ER_SEEK    => "Uploaded file archive is not possible to seek (`{1}`).",
    ];

    /**
     * @var \MvcCore\Ext\Forms\Validators\Files
     */
    protected $validator = NULL;

    /**
     * @var \SplFileObject
     */
    protected $spl = NULL;

    /**
     * @var string
     */
    protected $fullPath = NULL;

    /**
     * @var \ZipArchive
     */
    protected $zip = NULL;

    /**
     * @var bool|int
     */
    protected $openResult = NULL;

    /**
     * @var int
     */
    protected $index = 0;

    /**
     * @var array
     */
    protected $entry = NULL;
    
    /**
     * @param string $firstFourBytes
     * @return bool
     */
    public static function MatchMagicBytes ($firstFourBytes) {
        return $firstFourBytes === "PK\3\4";
    }

    /**
     * @return bool
     */
    public static function IsArchive () {
        return TRUE; 
    }
    
    /**
     * @return bool
     */
    public static function IsSupported () {
        return extension_loaded('zip'); 
    }
    
    /**
     * @return string
     */
    public static function GetNotSupportedError () {
        return static::ERR_NO_ZIP_EXT;
    }

    /**
     * @param \MvcCore\Ext\Forms\Validators\Files $validator
     * @param \SplFileObject $spl
     * @return void
     */
    public function __construct (\MvcCore\Ext\Forms\Validators\IFiles $validator, \SplFileObject $spl) {
        $this->validator = $validator;
        $this->spl = $spl;
        $this->fullPath = str_replace('\\', '/', $this->spl->getRealPath());
        $this->zip = new \ZipArchive();
    }

    /**
     * @return bool
     */
    public function Open () {
        $this->openResult = $this->zip->open(
            $this->fullPath, \ZipArchive::CHECKCONS
        );
        $this->index = 0;
        return $this->openResult === TRUE;
    }

    /**
     * @return string
     */
    public function GetError () {
        if ($this->openResult === TRUE) return 0;
        return static::$zipErrors[$this->openResult];
    }

    /**
     * @return int
     */
    public function GetCompressedSize () {
        return $this->spl->getSize();
    }

    /**
     * @return void
     */
    public function Close() {
        $this->zip->close();
    }

    /**
     * @return bool
     */
    public function Move() {
        $moved = ($entry = $this->zip->statIndex($this->index++));
        if ($moved) {
            $this->entry = $entry;
            return TRUE;
        }
        return FALSE;
    }

    /**
     * @return int
     */
    public function GetEntrySize () {
        return $this->entry['size'];
    }

    /**
     * @return string
     */
    public function GetEntryName () {
        return $this->entry['name'];
    }

    /**
     * @param string $destinationFullPath
     * @return string|NULL
     */
    public function ExtractEntry ($destinationFullPath) {
        $entryName = $this->entry['name'];
        $readPointer = $this->zip->getStream($entryName);
        // https://www.php.net/manual/en/wrappers.compression.php
        //$fullPath = $this->fullPath;
        //$readPointer = fopen("zip://{$fullPath}#{$entryName}", 'r');
        if (!$readPointer) 
            return NULL;
        $writePointer = fopen($destinationFullPath, 'w');
        while (!feof($readPointer))
            fwrite($writePointer, fread($readPointer, 131072));
        fclose($readPointer);
        fclose($writePointer);
        return $destinationFullPath;
    }
}