Amazon.S3.Internal.S3Signer.BuildStringToSign C# (CSharp) Метод

        static string BuildStringToSign(IRequest request)
        {
            var sb = new StringBuilder("", 256);

            sb.Append(request.HttpMethod);
            sb.Append("\n");

            var headers = request.Headers;
            var parameters = request.Parameters;

            if (headers != null)
            {
                string value = null;
                if (headers.ContainsKey(HeaderKeys.ContentMD5Header) && !String.IsNullOrEmpty(value = headers[HeaderKeys.ContentMD5Header]))
                {
                    sb.Append(value);
                }
                sb.Append("\n");

                if (parameters.ContainsKey("ContentType"))
                {
                    sb.Append(parameters["ContentType"]);
                }
                else if (headers.ContainsKey(HeaderKeys.ContentTypeHeader))
                {
                    sb.Append(headers[HeaderKeys.ContentTypeHeader]);
                }
                sb.Append("\n");
            }
            else
            {
                // The headers are null, but we still need to append
                // the 2 newlines that are required by S3.
                // Without these, S3 rejects the signature.
                sb.Append("\n\n");
            }

            if (parameters.ContainsKey("Expires"))
            {
                sb.Append(parameters["Expires"]);
                if (headers != null)
                    headers.Remove(HeaderKeys.XAmzDateHeader);
            }

            sb.Append("\n");
            sb.Append(BuildCanonicalizedHeaders(headers));

            var canonicalizedResource = BuildCanonicalizedResource(request);
            if (!string.IsNullOrEmpty(canonicalizedResource))
                sb.Append(canonicalizedResource);

            return sb.ToString();
        }