How do Implement authorization in MVC4 Web API? - asp.net-mvc-4

Question

I Had create a MVC4 Web API. But People without authorization also can use it.
Example: people type in address bar "/api/product/1" also can get the result.
So, How to implement Security and allow authorize person to use the WEB API only ?
How to give authorize to the person that allow login to web api ?

Answer 1

More info about Authentication and Authorization
Simply adding the annotation to your controller will do:
// Require authorization for all actions on the controller.
[Authorize]
public class ValuesController : ApiController
{
public HttpResponseMessage Get(int id) { ... }
public HttpResponseMessage Post() { ... }
}
// Restrict by user:
[Authorize(Users="Alice,Bob")]
public class ValuesController : ApiController
{
}
// Restrict by role:
[Authorize(Roles="Administrators")]
public class ValuesController : ApiController
{
}

Answer 2

you can use MVC4 AspNet.identiy.Usermanager and Microsoft.Owin.Security to authenticate user..
private IAuthenticationManager AuthenticationManager
{
get
{
return HttpContext.Current.GetOwinContext().Authentication;
}
}
public HttpResponseMessage Login(string username, string password)
{
UserManager<TenantUser> userManager=new new UserManager<TenantUser>(new UserStore<TenantUser>(YOUR DBCONTEXT));
var user = UserManager.Find(username, password);
if (user != null)
{
AuthenticationManager.SignOut(DefaultAuthenticationTypes.ApplicatioCookie);
ClaimsIdentity identity = await UserManager.CreateIdentityAsync(user, DefaultAuthenticationTypes.ApplicationCookie);
AuthenticationManager.SignIn(new AuthenticationProperties() { IsPersistent = true }, identity);
}
else
new HttpResponseMessage(HttpStatusCode.Forbidden) { Content = new ObjectContent<object>(new { Error = "You are not authorized to perform this action" }, Configuration.Formatters.JsonFormatter) };
}
it is working for me....