/// <summary>
/// Gets a read-only list of package owners from an optional nuget-package-owners attribute.
/// </summary>
/// <param name="signedAttributes">A <see cref="SignerInfo" /> signed attributes collection.</param>
/// <returns>A read-only list of package owners or <c>null</c>.</returns>
/// <exception cref="ArgumentNullException">Thrown if <paramref name="signedAttributes" /> is <c>null</c>.</exception>
/// <exception cref="SignatureException">Thrown if the attribute does not contain exactly one
/// attribute value.</exception>
public static IReadOnlyList <string> GetNuGetPackageOwners(CryptographicAttributeObjectCollection signedAttributes)
{
if (signedAttributes == null)
{
throw new ArgumentNullException(nameof(signedAttributes));
}
var attribute = signedAttributes.GetAttribute(Oids.NuGetPackageOwners);
if (attribute == null)
{
return(null);
}
if (attribute.Values.Count != 1)
{
throw new SignatureException(
string.Format(
CultureInfo.CurrentCulture,
Strings.ExactlyOneAttributeValueRequired,
"nuget-package-owners"));
}
var nugetPackageOwners = NuGetPackageOwners.Read(attribute.Values[0].RawData);
return(nugetPackageOwners.PackageOwners);
}
/// <summary>
/// Creates a nuget-package-owners attribute.
/// </summary>
/// <param name="packageOwners">A read-only list of package owners.</param>
/// <returns>An attribute object.</returns>
/// <exception cref="ArgumentException">Thrown if <paramref name="packageOwners" /> is either <c>null</c>
/// or empty or if any package owner name is invalid.</exception>
public static CryptographicAttributeObject CreateNuGetPackageOwners(IReadOnlyList <string> packageOwners)
{
if (packageOwners == null || packageOwners.Count == 0)
{
throw new ArgumentException(Strings.ArgumentCannotBeNullOrEmpty, nameof(packageOwners));
}
if (packageOwners.Any(packageOwner => string.IsNullOrWhiteSpace(packageOwner)))
{
throw new ArgumentException(Strings.NuGetPackageOwnersInvalidValue, nameof(packageOwners));
}
var nugetPackageOwners = new NuGetPackageOwners(packageOwners);
var bytes = nugetPackageOwners.Encode();
return(new CryptographicAttributeObject(
new Oid(Oids.NuGetPackageOwners),
new AsnEncodedDataCollection(new AsnEncodedData(Oids.NuGetPackageOwners, bytes))));
}
