/// <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="context">The context.</param>
/// <returns></returns>
public override Task AuthenticateExternalAsync(ExternalAuthenticationContext context)
{
var query =
from u in _users
where
u.Provider == context.ExternalIdentity.Provider &&
u.ProviderId == context.ExternalIdentity.ProviderId
select u;
var user = query.SingleOrDefault();
if (user == null)
{
string displayName;
var name = context.ExternalIdentity.Claims.FirstOrDefault(x => x.Type == Constants.ClaimTypes.Name);
if (name == null)
{
displayName = context.ExternalIdentity.ProviderId;
}
else
{
displayName = name.Value;
}
user = new InMemoryUser
{
Subject = CryptoRandom.CreateUniqueId(),
Provider = context.ExternalIdentity.Provider,
ProviderId = context.ExternalIdentity.ProviderId,
Username = displayName,
Claims = context.ExternalIdentity.Claims
};
_users.Add(user);
}
context.AuthenticateResult = new AuthenticateResult(user.Subject, GetDisplayName(user), identityProvider: context.ExternalIdentity.Provider);
return(Task.FromResult(0));
}