NuGet.Services.Operations.AzureTokenManager.LoadToken C# (CSharp) Method

        public async Task<AzureToken> LoadToken(string subscriptionId)
        {
            string path = Path.Combine(_root, "Subscriptions", subscriptionId + ".dat");
            if (!File.Exists(path))
            {
                return null;
            }

            string content = null;
            using (var reader = new StreamReader(path))
            {
                content = await reader.ReadToEndAsync();
            }
            if (content == null)
            {
                return null;
            }
            var unprotected =
                Encoding.UTF8.GetString(
                    ProtectedData.Unprotect(
                        Convert.FromBase64String(content),
                        null,
                        DataProtectionScope.CurrentUser));
            
            return JsonFormat.Deserialize<AzureToken>(unprotected);
        }