private async Task HandleAuthentication()

in src/Common/Common.Authentication/WindowsAuthenticationFactory.cs [37:90]
48 lines of code
9 McCabe index (conditional complexity)

        private async Task<IAccessToken> HandleAuthentication(
            IPowerBIEnvironment environment,
            IPowerBILogger logger,
            IPowerBISettings settings,
            IDictionary<string, string> queryParameters,
            string userName = null,
            SecureString password = null)
        {
            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
            {
                throw new NotSupportedException("Authenticator only works on Windows");
            }

            IEnumerable<string> scopes = new[] { $"{environment.AzureADResource}/.default" };
            BuildAuthApplication(environment, queryParameters, logger);
            AuthenticationResult result = null;

            try
            {
                var accounts = await this.AuthApplication.GetAccountsAsync();
                if (accounts != null && accounts.Any())
                {
                    // This indicates there's token in cache
                    result = await this.AuthApplication.AcquireTokenSilent(scopes, accounts.First()).ExecuteAsync();
                }
                else
                {
                    // auth application is auto cleared when there's no account
                    BuildAuthApplication(environment, queryParameters, logger);
                    if (!string.IsNullOrEmpty(userName) && password != null && password.Length > 0)
                    {
                        result = await this.AuthApplication.AcquireTokenByUsernamePassword(scopes, userName, password).ExecuteAsync();
                    }
                    else
                    {
                        result = await this.AuthApplication.AcquireTokenInteractive(scopes).ExecuteAsync();
                    }
                }
            }
            catch (Exception ex)
            {
                throw new AuthenticationException($"Error Acquiring Token:{System.Environment.NewLine}{ex.Message}");
            }

            if (result != null)
            {
                return result.ToIAccessToken();
                // Use the token
            }
            else
            {
                throw new AuthenticationException("Failed to acquire token");
            }
        }