Amazon.DynamoDBv2.DocumentModel.JsonUtils.TryDecodeBase64 C# (CSharp) Method

        private static bool TryDecodeBase64(DynamoDBEntry entry, out DynamoDBEntry decodedEntry)
        {
            decodedEntry = null;

            // Convert string primitive (S) to binary primitive (B)
            var primitive = entry as Primitive;
            if (primitive != null && primitive.Type == DynamoDBEntryType.String)
            {
                // Decode the contents
                var base64 = primitive.Value as string;
                byte[] bytes;
                if (!TryDecodeBase64(base64, out bytes))
                    return false;

                // Store as binary primitive (B)
                decodedEntry = new Primitive(bytes);
                return true;
            }

            // Convert string set (SS) to binary set (BS)
            var primitiveList = entry as PrimitiveList;
            if (primitiveList != null && primitiveList.Type == DynamoDBEntryType.String)
            {
                var decodedList = new PrimitiveList(DynamoDBEntryType.Binary);
                foreach(var item in primitiveList.Entries)
                {
                    // Attempt to decode
                    DynamoDBEntry decodedItem;
                    if (!TryDecodeBase64(item, out decodedItem))
                        return false;

                    // The decoded item must be a Primitive
                    Primitive decodedPrimitive = decodedItem as Primitive;
                    if (decodedPrimitive == null)
                        return false;

                    decodedList.Add(decodedPrimitive);
                }

                decodedEntry = decodedList;
                return true;
            }

            // In a given list (L), convert every string primitive (S) to binary primitive (B)
            // Non-strings and strings that cannot be converted will be left as-is
            var dynamoDBList = entry as DynamoDBList;
            if (dynamoDBList != null)
            {
                var decodedList = new DynamoDBList();
                foreach(var item in dynamoDBList.Entries)
                {
                    DynamoDBEntry decodedItem;
                    if (!TryDecodeBase64(item, out decodedItem))
                    {
                        // if decoding could not succeed, store same item
                        decodedItem = item;
                    }

                    decodedList.Add(decodedItem);
                }

                decodedEntry = decodedList;
                return true;
            }

            return false;
        }