How to customize authentication to my own set of tables in asp.net web api 2? - asp.net-web-api

Question

In the default AccountController created I see
public AccountController()
: this(Startup.UserManagerFactory(), Startup.OAuthOptions.AccessTokenFormat)
{
}
In Startup.Auth.cs I see
UserManagerFactory = () =>
new UserManager<IdentityUser>(new UserStore<IdentityUser>());
Seems like the implementation of UserStore comes from Microsoft.AspNet.Identity.EntityFramework.
So, to customize the authentication do I have to implement my own version of UserStore like
class MYSTUFFUserStore<IdentityUser> : UserStore<IdentityUser>
{
}
and override the methods and then do this in Startup.Auth.cs
UserManagerFactory = () =>
new UserManager<IdentityUser>(new MYSTUFFUserStore<IdentityUser>());
I am looking for a correct way to customize the authentication.

Answer 1

Assuming your table is called AppUser, convert your own AppUser domain object to IUser(using Microsoft.AspNet.Identity) like this
using Microsoft.AspNet.Identity;
public class AppUser : IUser
{
//Existing database fields
public long AppUserId { get; set; }
public string AppUserName { get; set; }
public string AppPassword { get; set; }
public AppUser()
{
this.Id = Guid.NewGuid().ToString();
}
[Ignore]
public virtual string Id { get; set; }
[Ignore]
public string UserName
{
get
{
return AppUserName;
}
set
{
AppUserName = value;
}
}
}
Implement the UserStore object like this
using Microsoft.AspNet.Identity;
public class UserStoreService
: IUserStore<AppUser>, IUserPasswordStore<AppUser>
{
CompanyDbContext context = new CompanyDbContext();
public Task CreateAsync(AppUser user)
{
throw new NotImplementedException();
}
public Task DeleteAsync(AppUser user)
{
throw new NotImplementedException();
}
public Task<AppUser> FindByIdAsync(string userId)
{
throw new NotImplementedException();
}
public Task<AppUser> FindByNameAsync(string userName)
{
Task<AppUser> task = context.AppUsers.Where(
apu => apu.AppUserName == userName)
.FirstOrDefaultAsync();
return task;
}
public Task UpdateAsync(AppUser user)
{
throw new NotImplementedException();
}
public void Dispose()
{
context.Dispose();
}
public Task<string> GetPasswordHashAsync(AppUser user)
{
if (user == null)
{
throw new ArgumentNullException("user");
}
return Task.FromResult(user.AppPassword);
}
public Task<bool> HasPasswordAsync(AppUser user)
{
return Task.FromResult(user.AppPassword != null);
}
public Task SetPasswordHashAsync(AppUser user, string passwordHash)
{
throw new NotImplementedException();
}
}
If you have your own custom password hashing you will also need to implement IPasswordHasher. Below is an example where there is no hashing of the password(Oh no!)
using Microsoft.AspNet.Identity;
public class MyPasswordHasher : IPasswordHasher
{
public string HashPassword(string password)
{
return password;
}
public PasswordVerificationResult VerifyHashedPassword
(string hashedPassword, string providedPassword)
{
if (hashedPassword == HashPassword(providedPassword))
return PasswordVerificationResult.Success;
else
return PasswordVerificationResult.Failed;
}
}
In Startup.Auth.cs replace
UserManagerFactory = () =>
new UserManager<IdentityUser>(new UserStore<IdentityUser>());
with
UserManagerFactory = () =>
new UserManager<AppUser>(new UserStoreService()) { PasswordHasher = new MyPasswordHasher() };
In ApplicationOAuthProvider.cs, replace IdentityUser with AppUser
In AccountController.cs, replace IdentityUser with AppUser and delete all the external authentication methods like GetManageInfo and RegisterExternal etc.