private static string GetKmsKeyIdFromMetadata()

in src/Internal/SetupDecryptionHandlerV1.cs [48:84]
34 lines of code
5 McCabe index (conditional complexity)

        private static string GetKmsKeyIdFromMetadata(MetadataCollection metadata)
        {
            var materialDescriptionJsonString = metadata[EncryptionUtils.XAmzMatDesc];
            if (materialDescriptionJsonString == null)
            {
                throw new InvalidDataException( $"{KMSKeyIDMetadataMessage} The key '{EncryptionUtils.XAmzMatDesc}' is missing.");
            }
            else
            {
                JsonData materialDescriptionJsonData;
                try
                {
                    materialDescriptionJsonData = JsonMapper.ToObject(materialDescriptionJsonString);
                }
                catch (JsonException e)
                {
                    throw new InvalidDataException($"{KMSKeyIDMetadataMessage} The key '{EncryptionUtils.XAmzMatDesc}' does not contain valid JSON.", e);
                }

                JsonData kmsKeyIDJsonData;
                try
                {
                    kmsKeyIDJsonData = materialDescriptionJsonData[EncryptionUtils.KMSCmkIDKey];
                }
                catch (JsonException e)
                {
                    throw new InvalidDataException($"{KMSKeyIDMetadataMessage} The key '{EncryptionUtils.KMSCmkIDKey}' is does not contain valid JSON.", e);
                }

                if (kmsKeyIDJsonData == null)
                {
                    throw new InvalidDataException($"{KMSKeyIDMetadataMessage} The key '{kmsKeyIDJsonData}' is missing from the material description.");
                }

                return kmsKeyIDJsonData.ToString();
            }
        }