ACMESharp.AcmeClient.DecodeChallenge C# (CSharp) Method

        public AuthorizeChallenge DecodeChallenge(AuthorizationState authzState, string challengeType)
        {
            AssertInit();
            AssertRegistration();

            var authzChallenge = authzState.Challenges.FirstOrDefault(x => x.Type == challengeType);
            if (authzChallenge == null)
                throw new ArgumentOutOfRangeException(nameof(challengeType),
                        "no challenge found matching requested type")
                        .With("challengeType", challengeType);

            var provider = ChallengeDecoderExtManager.GetProvider(challengeType);
            if (provider == null)
                throw new NotSupportedException("no provider exists for requested challenge type")
                        .With("challengeType", challengeType);

            using (var decoder = provider.GetDecoder(authzState.IdentifierPart, authzChallenge.ChallengePart))
            {
                authzChallenge.Challenge = decoder.Decode(authzState.IdentifierPart, authzChallenge.ChallengePart, Signer);

                if (authzChallenge.Challenge == null)
                    throw new InvalidDataException("challenge decoder produced no output");
            }

            return authzChallenge;
        }