/// <summary>
/// Retrieves the display name.
/// </summary>
/// <param name="user">The user.</param>
/// <returns></returns>
protected virtual string GetDisplayName(InMemoryUser user)
{
var nameClaim = user.Claims.FirstOrDefault(x => x.Type == Constants.ClaimTypes.Name);
if (nameClaim != null)
{
return(nameClaim.Value);
}
return(user.Username);
}
/// <summary>
/// This method gets called when the user uses an external identity provider to authenticate.
/// </summary>
/// <param name="externalUser">The external user.</param>
/// <param name="message">The signin message.</param>
/// <returns>
/// The authentication result.
/// </returns>
public virtual Task <AuthenticateResult> AuthenticateExternalAsync(ExternalIdentity externalUser, SignInMessage message)
{
var query =
from u in _users
where
u.Provider == externalUser.Provider &&
u.ProviderId == externalUser.ProviderId
select u;
var user = query.SingleOrDefault();
if (user == null)
{
string displayName;
var name = externalUser.Claims.FirstOrDefault(x => x.Type == Constants.ClaimTypes.Name);
if (name == null)
{
displayName = externalUser.ProviderId;
}
else
{
displayName = name.Value;
}
user = new InMemoryUser
{
Subject = CryptoRandom.CreateUniqueId(),
Provider = externalUser.Provider,
ProviderId = externalUser.ProviderId,
Username = displayName,
Claims = externalUser.Claims
};
_users.Add(user);
}
var p = IdentityServerPrincipal.Create(user.Subject, GetDisplayName(user), Constants.AuthenticationMethods.External, user.Provider);
var result = new AuthenticateResult(p);
return(Task.FromResult(result));
}
