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<?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
{
$path = sys_get_temp_dir();
if (self::$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)) {
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);
}
return self::fileExists("zip://$filename#$zipMember");
}
}
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