HttpRequestMessage generateSignedRequest()

in GameLiftExampleUnityProject/Assets/Scripts/Client/MatchmakingClient.cs [92:150]
46 lines of code
6 McCabe index (conditional complexity)

    HttpRequestMessage generateSignedRequest(string url)
    {
        var endpointUri = url;

        var uri = new Uri(endpointUri);

        var headers = new Dictionary<string, string>
            {
                {AWS4SignerBase.X_Amz_Content_SHA256, AWS4SignerBase.EMPTY_BODY_SHA256},
            };

        var signer = new AWS4SignerForAuthorizationHeader
        {
            EndpointUri = uri,
            HttpMethod = "GET",
            Service = "execute-api",
            Region = regionString
        };

        //Extract the query parameters
        var queryParams = "";
        if (url.Split('?').Length > 1)
        {
            queryParams = url.Split('?')[1];
        }

        var authorization = signer.ComputeSignature(headers,
                                                    queryParams,
                                                    AWS4SignerBase.EMPTY_BODY_SHA256,
                                                    Client.cognitoCredentials.AccessKey,
                                                    Client.cognitoCredentials.SecretKey);

        headers.Add("Authorization", authorization);

        var request = new HttpRequestMessage
        {
            Method = HttpMethod.Get,
            RequestUri = new Uri(url),
        };

        // Add the generated headers to the request
        foreach (var header in headers)
        {
            try
            {
                if (header.Key != null && header.Value != null)
                    request.Headers.Add(header.Key, header.Value);
            }
            catch (Exception e)
            {
                Debug.Log("error: " + e.GetType().ToString());
            }
        }

        // Add the IAM authentication token
        request.Headers.Add("x-amz-security-token", Client.cognitoCredentials.Token);

        return request;
    }