ChaosSearch Storage API - .NET

using System;
using System.Web;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Security.Cryptography;
using System.Text;

namespace ChaosAPI
{
    public class Program
    {
        public static string url = "https://local.chaossearch.io/Bucket/createObjectGroup";
        public static string accessKey = "<your accesskey from CHAOS UI>";
        public static string secretkey = "<your secretkey from CHAOS UI>";
        public static string awsRegion = "us-east-1";
        public static string awsServiceName = "s3";

    public static void startIndexing(string objectGroupName)
     {
            string url = "https://local.chaossearch.io/Bucket/model";
            HttpRequestMessage msg = new HttpRequestMessage(HttpMethod.Post, url);
            msg.Headers.Host = msg.RequestUri.Host;

            // Get and save dates ready for further use.
            DateTimeOffset utcNowSaved = DateTimeOffset.UtcNow;

            //Expects this format in the header Sun, 05 Apr 2020 17:16:05 GMT
            string reqDate = utcNowSaved.ToString("ddd, dd MMM yyyy HH:mm:ss") + " GMT";

            // Add to request header 
            msg.Headers.Add("Date", reqDate);

            // Start Indexing
            string reqJson = "{\"BucketName\":\"" + objectGroupName + "\",\"ModelMode\":0}";
            msg.Content = new StringContent(reqJson);
            Console.WriteLine(reqJson);

            string stringToSign = "POST\n\n" + "text/plain; charset=UTF-8\n" + reqDate + "\n/Bucket/model";

            HMACSHA1 hmac = new HMACSHA1(Encoding.UTF8.GetBytes(secretkey));

            var signature = System.Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign.ToString())));

            msg.Headers.Add("Authorization", "AWS " + accessKey + ":" + signature);

            // Invoke the request with HttpClient.
            HttpClient client = new HttpClient();
            HttpResponseMessage result = client.SendAsync(msg).Result;
            Console.WriteLine(result.ToString());

            if (result.IsSuccessStatusCode)
            {
                Console.WriteLine("Indexing started for " + objectGroupName);

            }
        }

      public static void Main(string[] args)
        {
           //Simple example creating an Object Group and starting Indexing 

            HttpRequestMessage msg = new HttpRequestMessage(HttpMethod.Post, url);
            msg.Headers.Host = msg.RequestUri.Host;

            // Get and save dates ready for further use.
            DateTimeOffset utcNowSaved = DateTimeOffset.UtcNow;

            //Expects this format in the header Sun, 05 Apr 2020 17:16:05 GMT
            string reqDate = utcNowSaved.ToString("ddd, dd MMM yyyy HH:mm:ss") + " GMT";

            // Add to requeat header 
            msg.Headers.Add("Date", reqDate);

            string s3bucket = "s3-bucket"; //Bucket contain data that CHOAS has access to (and is visible in UI)
            string objectGroupName = "ogTest"; //Object Group Name to create

	    //JSON for the Object Group, Filter, Type, Live Indexing, Retention
            var reqJson = "{\"bucket\":\"" + objectGroupName + "\",\"source\":\"" + s3bucket + "\",\"format\":{\"_type\":\"JSON\",\"stripPrefix\":true},\"interval\":{\"mode\":0,\"column\":0},\"indexRetention\":-1,\"filter\":[{\"field\":\"key\",\"regex\":\".*\"}],\"options\":{\"ignoreIrregular\":true,\"compression\":\"GZIP\"}}";
            msg.Content = new StringContent(reqJson);
            
            //Amazon https://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html
	    //Below is minimum needed to sign for CHAOS with appropriate new lines 
            string stringToSign = "POST\n\n" + "text/plain; charset=UTF-8\n" + reqDate + "\n/Bucket/createObjectGroup";
            HMACSHA1 hmac = new HMACSHA1(Encoding.UTF8.GetBytes(secretkey));

            var signature = System.Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign.ToString())));

            msg.Headers.Add("Authorization", "AWS " + accessKey + ":" + signature);
            
            // Invoke the request with HttpClient.
            HttpClient client = new HttpClient();
            HttpResponseMessage result = client.SendAsync(msg).Result;
            Console.WriteLine(result.ToString());

            if (result.IsSuccessStatusCode) //200 on OK & 400 when already exists
            {
                Console.WriteLine(objectGroupName + "created successfully.");
                startIndexing(objectGroupName);
            }
        }
    }
}