using System;

using System.Collections.Generic;

using System.Net.Http;

using JWT;

using JWT.Algorithms;

using JWT.Serializers;

using System.Security.Cryptography;

using System.Text;

using System.Linq;

using System.Net.Http.Headers;

public class Program

{

    public static void Main()

    {

        //payload received from easiware - with some addition

        string payload = "{\"publisher\": {\"id\": \"17841451743755547\",\"provider\": \"cmtelecom\",\"credentials\": {\"type\": \"cmtelecom\",\"account_id\": \"c64629de-d8c4-47e3-808c-be69748e076c\",\"producttoken\":\"9e620327-53b1-4e61-a879-bd96c80256f5\"}},\"subscriber\": {\"id\": \"83b6ed11ca41c13ae78a61214bb372d6061ecbf7\",\"endpoint\": \"https://easitestas810.testtoctoc.io/webhook/messaging/event\",\"Name\": \"easitestas810\"}}";

        // concerned domain, inbound request 

        string domain = "easitestas810";

        // from config 

        string easiconnectUrl = "https://1wh3r3e-dev-api.easiconnect.io";

        string hash = SHA1Hash($"{domain}.testtoctoc.io");

        Console.WriteLine("hash : {0}", hash);

        string url = $"{easiconnectUrl}/easichat/{hash}/1.1/instagram/apps";        

        Console.WriteLine("URL : {0}", url);

        //from config 

        string apiKey = "27524f92-39fc-44e1-b6b2-97603e17d1cc";

        string secret = "0958e420-b1c6-402e-a597-0e28318e98ab";

        string bearer = GenerateJWTTokenFor(domain, HttpMethod.Put, url, JWTScopeActionClaim.Save, JWTScopeToClaim.Channel, secret);

        Console.WriteLine("Bearer : {0}", bearer);

        string signedBody = GenerateSignedBody(payload, secret);

        var response = SendPutRequest(url, payload, signedBody, bearer, apiKey);

        Console.WriteLine("Resquest result {0}\r\n{1} ", response.StatusCode, response.Content.ReadAsStringAsync().Result);

    }

    public static HttpResponseMessage SendPutRequest(string uri, string data, string signedData, string bearer, string apiKey)

    {

        var url = new Uri(uri);

        using  (var client = new HttpClient())

        {

            client.DefaultRequestHeaders.Clear();

            client.DefaultRequestHeaders.Add("x-chat-token", "Yn&1]_lm5>}abn|q<Ow}QAG-J;>SdoHLi{^]D&?NX1u2gJ)354S=l%3'Tx1h$u^");

​

        if (!string.IsNullOrEmpty(apiKey) && !string.IsNullOrEmpty(bearer))

        {

            client.DefaultRequestHeaders.Add("x-api-key", apiKey);

            client.DefaultRequestHeaders.Add("x-content-digest", $"sha256={signedData}");

            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", bearer);

        }

        client.DefaultRequestHeaders.Accept.Add(

            new MediaTypeWithQualityHeaderValue("application/json"));

        return client.PutAsync(url, new StringContent(data ?? "", Encoding.UTF8, "application/json")).Result;

        }

    }

    public static string GenerateSignedBody(string body, string secret)

    {

        secret = secret ?? "";

        var keyByte = Encoding.UTF8.GetBytes(secret);

        var messageBytes = Encoding.UTF8.GetBytes(body);

        using (var hmacsha256 = new HMACSHA256(keyByte))

        {

            var hashmessage = hmacsha256.ComputeHash(messageBytes);

            return Convert

                .ToBase64String(hashmessage)

                .Replace("+", "-")

                .Replace("/", "_")

                .Replace("=", "");

        }

    }

    public static string GenerateJWTTokenFor(string domain, HttpMethod verb, string url, string scopeAction, string scopeTo, string secret)

    {

        var iss = $"{domain}.testtoctoc.io";

        var iatEpoch = (int)(DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalSeconds;

        var expEpoch = (int)(DateTime.UtcNow.AddHours(1) - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalSeconds;

        var uri = new Uri(url);

        var claims = new Dictionary<string, object>

        {

            { "iss", iss },

            { "sub", SHA1Hash(iss)},

            { "iat", iatEpoch },

            { "exp", expEpoch },

            { "aud", $"{verb.Method.ToUpper()} {uri.Host + uri.LocalPath}" },

            { "scope", $"{scopeAction}:{scopeTo}" }

        };

        IJwtAlgorithm algorithm = new HMACSHA256Algorithm();

        IJsonSerializer serializer = new JsonNetSerializer();

        IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();

        IJwtEncoder encoder = new JwtEncoder(algorithm, serializer, urlEncoder);

        return encoder.Encode(claims, secret);

    }

    public static string SHA1Hash(string input)

    {

        using (var sha1 = new SHA1Managed())

        {

            var hash = sha1.ComputeHash(Encoding.UTF8.GetBytes(input));

            return string.Concat(hash.Select(b => b.ToString("x2")));

        }

    }

}

     public static class JWTScopeActionClaim

    {

        public const string Read = "read";

        public const string Create = "create";

        public const string Save = "save";

        public const string Update = "update";

        public const string Delete = "delete";

    }

    public static class JWTScopeToClaim

    {

        public const string Channel = "channel";

        public const string Message = "message";

    }