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WebAPI/GoogleDriveHelper.cs

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+using Google.Apis.Auth.OAuth2;
+using Google.Apis.Drive.v3;
+using Google.Apis.Services;
+
+namespace WebAPI
+{
+    public class GoogleDriveHelper
+    {
+        public DriveService Service { get; set; }
+        const string APPLICATION_NAME = "Diuna";
+        static readonly string[] Scopes = { DriveService.Scope.Drive };
+        public GoogleDriveHelper()
+        {
+            InitializeService();
+        }
+        private void InitializeService()
+        {
+            var credential = GetCredentialsFromFile();
+            Service = new DriveService(new BaseClientService.Initializer()
+            {
+                HttpClientInitializer = credential,
+                ApplicationName = APPLICATION_NAME
+            });
+        }
+        private GoogleCredential GetCredentialsFromFile()
+        {
+            GoogleCredential credential;
+            using (var stream = new FileStream("client_secrets.json", FileMode.Open, FileAccess.Read))
+            {
+                credential = GoogleCredential.FromStream(stream).CreateScoped(Scopes);
+            }
+            return credential;
+        }
+    }
+}