Proyectos de Subversion Moodle

<?php

namespace PhpOffice\PhpSpreadsheet\Shared;

use PhpOffice\PhpSpreadsheet\Exception;

use PhpOffice\PhpSpreadsheet\Reader\Exception as ReaderException;

use ZipArchive;

class File

{

    /**

     * Use Temp or File Upload Temp for temporary files.

     *

     * @var bool

     */

    protected static $useUploadTempDirectory = false;

    /**

     * Set the flag indicating whether the File Upload Temp directory should be used for temporary files.

     */

    public static function setUseUploadTempDirectory(bool $useUploadTempDir): void

    {

        self::$useUploadTempDirectory = (bool) $useUploadTempDir;

    }

    /**

     * Get the flag indicating whether the File Upload Temp directory should be used for temporary files.

     */

    public static function getUseUploadTempDirectory(): bool

    {

        return self::$useUploadTempDirectory;

    }

    // https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT

    // Section 4.3.7

    // Looks like there might be endian-ness considerations

    private const ZIP_FIRST_4 = [

        "\x50\x4b\x03\x04", // what it looks like on my system

        "\x04\x03\x4b\x50", // what it says in documentation

    ];

    private static function validateZipFirst4(string $zipFile): bool

    {

        $contents = @file_get_contents($zipFile, false, null, 0, 4);

        return in_array($contents, self::ZIP_FIRST_4, true);

    }

    /**

     * Verify if a file exists.

     */

    public static function fileExists(string $filename): bool

    {

        // Sick construction, but it seems that

        // file_exists returns strange values when

        // doing the original file_exists on ZIP archives...

        if (strtolower(substr($filename, 0, 6)) == 'zip://') {

            // Open ZIP file and verify if the file exists

            $zipFile = substr($filename, 6, strrpos($filename, '#') - 6);

            $archiveFile = substr($filename, strrpos($filename, '#') + 1);

            if (self::validateZipFirst4($zipFile)) {

                $zip = new ZipArchive();

                $res = $zip->open($zipFile);

                if ($res === true) {

                    $returnValue = ($zip->getFromName($archiveFile) !== false);

                    $zip->close();

                    return $returnValue;

                }

            }

            return false;

        }

        return file_exists($filename);

    }

    /**

     * Returns canonicalized absolute pathname, also for ZIP archives.

     */

    public static function realpath(string $filename): string

    {

        // Returnvalue

        $returnValue = '';

        // Try using realpath()

        if (file_exists($filename)) {

            $returnValue = realpath($filename) ?: '';

        }

        // Found something?

        if ($returnValue === '') {

            $pathArray = explode('/', $filename);

            while (in_array('..', $pathArray) && $pathArray[0] != '..') {

                $iMax = count($pathArray);

                for ($i = 0; $i < $iMax; ++$i) {

                    if ($pathArray[$i] == '..' && $i > 0) {

                        unset($pathArray[$i], $pathArray[$i - 1]);

                        break;

                    }

                }

            }

            $returnValue = implode('/', $pathArray);

        }

        // Return

        return $returnValue;

    }

    /**

     * Get the systems temporary directory.

     */

    public static function sysGetTempDir(): string

    {

        // Moodle hack!

        if (function_exists('make_temp_directory')) {

            $temp = make_temp_directory('phpspreadsheet');

            return realpath(dirname($temp));

        }

        $path = sys_get_temp_dir();

        if (self::$useUploadTempDirectory) {

            //  use upload-directory when defined to allow running on environments having very restricted

            //      open_basedir configs

            if (ini_get('upload_tmp_dir') !== false) {

                if ($temp = ini_get('upload_tmp_dir')) {

                    if (file_exists($temp)) {

                        $path = $temp;

                    }

                }

            }

        }

        return realpath($path) ?: '';

    }

    public static function temporaryFilename(): string

    {

        $filename = tempnam(self::sysGetTempDir(), 'phpspreadsheet');

        if ($filename === false) {

            throw new Exception('Could not create temporary file');

        }

        return $filename;

    }

    /**

     * Assert that given path is an existing file and is readable, otherwise throw exception.

     */

    public static function assertFile(string $filename, string $zipMember = ''): void

    {

        if (!is_file($filename)) {

            throw new ReaderException('File "' . $filename . '" does not exist.');

        }

        if (!is_readable($filename)) {

            throw new ReaderException('Could not open "' . $filename . '" for reading.');

        }

        if ($zipMember !== '') {

            $zipfile = "zip://$filename#$zipMember";

            if (!self::fileExists($zipfile)) {

                // Has the file been saved with Windoze directory separators rather than unix?

                $zipfile = "zip://$filename#" . str_replace('/', '\\', $zipMember);

                if (!self::fileExists($zipfile)) {

                    throw new ReaderException("Could not find zip member $zipfile");

                }

            }

        }

    }

    /**

     * Same as assertFile, except return true/false and don't throw Exception.

     */

    public static function testFileNoThrow(string $filename, ?string $zipMember = null): bool

    {

        if (!is_file($filename)) {

            return false;

        }

        if (!is_readable($filename)) {

            return false;

        }

        if ($zipMember === null) {

            return true;

        }

        // validate zip, but don't check specific member

        if ($zipMember === '') {

            return self::validateZipFirst4($filename);

        }

        $zipfile = "zip://$filename#$zipMember";

        if (self::fileExists($zipfile)) {

            return true;

        }

        // Has the file been saved with Windoze directory separators rather than unix?

        $zipfile = "zip://$filename#" . str_replace('/', '\\', $zipMember);

        return self::fileExists($zipfile);

    }

}