BeerDrinkin.Service.Helpers.IdentitiyHelper.FindSidAsync C# (CSharp) Method

        public static async Task<string> FindSidAsync(IPrincipal claimsPrincipal, HttpRequestMessage request)
        {
            var aiTelemetry = new TelemetryClient();
            var principal = claimsPrincipal as ClaimsPrincipal;
            if (principal == null)
            {
                aiTelemetry.TrackEvent("FindSidAsync: ClaimsPrincipal is null!");
                return string.Empty;
            }

            var match = principal.FindFirst("http://schemas.microsoft.com/identity/claims/identityprovider");
            string provider;
            if (match != null)
                provider = match.Value;
            else
            {
                aiTelemetry.TrackEvent("FindSidAsync: Can't find identity provider");
                return string.Empty;
            }

            ProviderCredentials creds = null;
            if (string.Equals(provider, "facebook", StringComparison.OrdinalIgnoreCase))
            {
                creds = await claimsPrincipal.GetAppServiceIdentityAsync<FacebookCredentials>(request);
            }
            else if (string.Equals(provider, "microsoftaccount", StringComparison.OrdinalIgnoreCase))
            {
                creds = await claimsPrincipal.GetAppServiceIdentityAsync<MicrosoftAccountCredentials>(request);
            }
            else if (string.Equals(provider, "twitter", StringComparison.OrdinalIgnoreCase))
            {
                creds = await claimsPrincipal.GetAppServiceIdentityAsync<TwitterCredentials>(request);
            }

            if (creds == null)
            {
                aiTelemetry.TrackEvent("FindSidAsync: Credentials not found");
                return string.Empty;
            }

            return creds.UserId;
        }
    }