#ASP.NET Authentication

• OAuth Authentication
  • Notes
  • Nugets Installation
  • Postman testing
  • References
• Access OAuth REST Web API
  • Notes
  • Nugets
  • References

• Execution test Url --> https://localhost:44340/api/webapi
• Token generation url --> https://localhost:44340/token

• Install necessary Nugets
• Create the necessary tables and stored procedures
• [Authorize] attribute should be added to controller
• Add authentication configuration in the startup.cs

  // Web API configuration and services  
  // Configure Web API to use only bearer token authentication.  
  config.SuppressDefaultHostAuthentication();  
  config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));  

• Json format for the response

  // WebAPI when dealing with JSON & JavaScript!  
  // Setup json serialization to serialize classes to camel (std. Json format)  
  var formatter = GlobalConfiguration.Configuration.Formatters.JsonFormatter;  
  formatter.SerializerSettings.ContractResolver = new Newtonsoft.Json.Serialization.CamelCasePropertyNamesContractResolver(); 

• Implementation authentication in start.auth.cs
• Implementation authentication provider in AppOAuthProvider

• Microsoft.Owin.Security.OAuth
• Microsoft.Owin.Cors
• Microsoft.AspNet.WebApi.Core
• Microsoft.AspNet.WebApi.Owin
• Microsoft.Owin.Security.Cookies
• Microsoft.AspNet.Identity.Core
• Microsoft.AspNet.Identity.Owin
• Microsoft.Owin.Host.SystemWeb

Access Token Generation

WebApi Authentication

1. https://www.c-sharpcorner.com/article/asp-net-mvc-oauth-2-0-rest-web-api-authorization-using-database-first-approach/
2. https://docs.microsoft.com/en-us/previous-versions/aspnet/dn308223(v=vs.113)?redirectedfrom=MSDN

• Get Authorization code using the client credentials
• Parse the result and get access token
• Send the access token as an authourization header

• Newtonsoft.Json

1. https://www.c-sharpcorner.com/article/c-sharp-net-access-oauth-rest-web-api-method/