How to Generate a JWT Token for Authentication

Question

I am working on an API solutions and I want to create token that allow me to consume api for my solution, How can I do that in soluation?

Answer 1

Generate a JWT Token for Authentication

To create token, you should follow the below steps in details:

1. Navigate to the Web.config file and access the appSettings section.
2. Add in appSettings 5 key and it's value
   • Key ClientId and value is APPLICATION_Client
   • Key ClientSecret and value is APPLICATION_Secret/
   • Key GrantType and value is client_credentials
   • Key Scope and value is APPLICATION_SCOPE
   • Key TokenURL and value is TOKEN_URL

3. Retrieve values from previous keys in the Web.Config file of the MVC application

    static string ClientId = ConfigurationManager.AppSettings["ClientId"];
    static string ClientSecret = ConfigurationManager.AppSettings["ClientSecret"];
    static string GrantType = ConfigurationManager.AppSettings["GrantType"];
    static string Scope = ConfigurationManager.AppSettings["Scope"];
    static string TokenURL = ConfigurationManager.AppSettings["TokenURL"];
   

4. Develop a method that generates a token for authorizing the application to invoke the API

     public static async Task<Test> CreateToken()
     {
          var session = System.Web.HttpContext.Current.Session["TokenSession"];
          if (session != null && ((Test)session).ExpireIn > DateTime.Now)
          {
                  return (Test)session;
          }
   
            using (HttpClient client = new HttpClient())
            {
                var paramss = new Dictionary<string, string>();
                paramss.Add("client_id", ClientId.ToString());
                paramss.Add("client_secret", ClientSecret.ToString());
                paramss.Add("grant_type", GrantType.ToString());
                paramss.Add("scope", Scope.ToString());
   
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/x-www-form-urlencoded"));
   
                 try
                 {
                      var response = client.PostAsync(TokenURL, new FormUrlEncodedContent(paramss)).Result;
   
                      var token = response.Content.ReadAsStringAsync().Result;
   
                     if (response.IsSuccessStatusCode)
                     {
                           var cu = await response.Content.ReadAsStringAsync();
                           var SelectedObject = JsonConvert.DeserializeObject<Test>(cu);
                           SelectedObject.ExpireIn = DateTime.Now.AddSeconds(int.Parse(SelectedObject.expires_in));
                           System.Web.HttpContext.Current.Session["TokenSession"] = SelectedObject;
                           return SelectedObject;
                     }
                     else
                     {
                           throw new Exception("يوجد مشكلة في الاتصال الخارجي بالنظام");
                     }
                 }
                 catch (Exception ex)
                 {
                           throw new Exception("يوجد مشكلة في الاتصال الخارجي بالنظام");
                  }
              }
     }
   

P.S: Test Class : The return type of the CreateToken method should include essential variables, notably access_token.

public class Test
{
    public string access_token { get; set; }
    public string expires_in { get; set; }
    public string token_type { get; set; }
    public string scope { get; set; }
    public DateTime ExpireIn { get; set; }

}

Result: