private void ValidateLicenseFile(IEnumerable <IPackageFile> files, LicenseMetadata licenseMetadata)
{
if (!PackageTypes.Contains(PackageType.SymbolsPackage) && licenseMetadata?.Type == LicenseType.File)
{
var ext = Path.GetExtension(licenseMetadata.License);
if (!string.IsNullOrEmpty(ext) &&
!ext.Equals(".txt", StringComparison.OrdinalIgnoreCase) &&
!ext.Equals(".md", StringComparison.OrdinalIgnoreCase))
{
throw new PackagingException(NuGetLogCode.NU5031, string.Format(CultureInfo.CurrentCulture, NuGetResources.Manifest_LicenseFileExtensionIsInvalid, licenseMetadata.License));
}
var strippedLicenseFileLocation = PathUtility.StripLeadingDirectorySeparators(licenseMetadata.License);
var count = files.Where(e => PathUtility.StripLeadingDirectorySeparators(e.Path).Equals(strippedLicenseFileLocation, PathUtility.GetStringComparisonBasedOnOS())).Count();
if (count == 0)
{
throw new PackagingException(NuGetLogCode.NU5030, string.Format(CultureInfo.CurrentCulture, NuGetResources.Manifest_LicenseFileIsNotInNupkg, licenseMetadata.License));
}
}
}