public async Task RespondToTwoFactorChallengeAsync()

in src/Amazon.AspNetCore.Identity.Cognito/CognitoSigninManager.cs [346:385]
32 lines of code
8 McCabe index (conditional complexity)

        public async Task<SignInResult> RespondToTwoFactorChallengeAsync(string code, bool isPersistent, bool rememberClient)
        {
            var twoFactorInfo = await RetrieveTwoFactorInfoAsync().ConfigureAwait(false);
            if (twoFactorInfo == null ||  string.IsNullOrWhiteSpace(twoFactorInfo.UserId))
            {
                return SignInResult.Failed;
            }
            var user = await _userManager.FindByIdAsync(twoFactorInfo.UserId).ConfigureAwait(false);
            if (user == null)
            {
                return SignInResult.Failed;
            }

            // Responding to the Cognito challenge.
            await _userManager.RespondToTwoFactorChallengeAsync(user, code, twoFactorInfo.ChallengeNameType, twoFactorInfo.CognitoAuthenticationWorkflowId).ConfigureAwait(false);

            if (user.SessionTokens == null || !user.SessionTokens.IsValid())
            {
                return SignInResult.Failed;
            }
            else
            {
                // Cleanup external cookie
                if (twoFactorInfo.LoginProvider != null)
                {
                    await Context.SignOutAsync(IdentityConstants.ExternalScheme).ConfigureAwait(false);
                }
                // Cleanup two factor user id cookie
                await Context.SignOutAsync(IdentityConstants.TwoFactorUserIdScheme).ConfigureAwait(false);

                if (rememberClient)
                {
                    await RememberTwoFactorClientAsync(user).ConfigureAwait(false);
                }

                // This creates the ClaimPrincipal and signs in the user in the IdentityConstants.ApplicationScheme
                await SignInAsync(user, isPersistent, twoFactorInfo.LoginProvider).ConfigureAwait(false);
                return SignInResult.Success;
            }
        }