使用Asp.Net MVc获取Google文档api刷新令牌和访问令牌

Question

Can anyone help me to get the google docs api refresh token for the first time in asp .Net MVC. I have client Id and Client Secrete, from this how should i get the refresh token and further from refresh token how should i get the access token to access the google api for drive.

Answer 1

They haven't done a lot of with the sample code for the Drive API V3 yet have they. I wouldn't use all of these scopes pick which ones you need this code is pre-generated.

NuGet Package

PM> Install-Package Google.Apis.Drive.v3

    /// <summary>
    /// This method requests Authentication from a user using Oauth2.  
    /// Credentials are stored in System.Environment.SpecialFolder.Personal
    /// Documentation https://developers.google.com/accounts/docs/OAuth2
    /// </summary>
    /// <param name="clientSecretJson">Path to the client secret json file from Google Developers console.</param>
    /// <param name="userName">Identifying string for the user who is being authentcated.</param>
    /// <returns>DriveService used to make requests against the Drive API</returns>
    public static DriveService AuthenticateOauth(string clientSecretJson, string userName)
    {
        try
        {
            if (string.IsNullOrEmpty(userName))
                throw new Exception("userName is required.");
            if (!File.Exists(clientSecretJson))
                throw new Exception("clientSecretJson file does not exist.");

            // These are the scopes of permissions you need. It is best to request only what you need and not all of them
            string[] scopes = new string[] { DriveService.Scope.Drive,                   // View and manage the files in your Google Drive
                                             DriveService.Scope.DriveAppdata,            // View and manage its own configuration data in your Google Drive
                                             DriveService.Scope.DriveFile,               // View and manage Google Drive files and folders that you have opened or created with this app
                                             DriveService.Scope.DriveMetadata,           // View and manage metadata of files in your Google Drive
                                             DriveService.Scope.DriveMetadataReadonly,   // View metadata for files in your Google Drive
                                             DriveService.Scope.DrivePhotosReadonly,     // View the photos, videos and albums in your Google Photos
                                             DriveService.Scope.DriveReadonly,           // View the files in your Google Drive
                                             DriveService.Scope.DriveScripts};           // Modify your Google Apps Script scripts' behavior
            UserCredential credential;
            using (var stream = new FileStream(clientSecretJson, FileMode.Open, FileAccess.Read))
            {
                string credPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
                credPath = Path.Combine(credPath, ".credentials/apiName");

                // Requesting Authentication or loading previously stored authentication for userName
                credential = GoogleWebAuthorizationBroker.AuthorizeAsync(GoogleClientSecrets.Load(stream).Secrets,
                                                                         scopes,
                                                                         userName,
                                                                         CancellationToken.None,
                                                                         new FileDataStore(credPath, true)).Result;
            }

            // Create Drive API service.
            return new DriveService(new BaseClientService.Initializer()
                {
                    HttpClientInitializer = credential,
                    ApplicationName = "Drive Authentication Sample",
                });
        }
        catch (Exception ex)
        {
            Console.WriteLine("Create Oauth2 DriveService failed" + ex.Message);
            throw new Exception("CreateOauth2DriveFailed", ex);
        }
    }

Service account Json key file not the p12

 /// <summary>
    /// Authenticating to Google using a Service account
    /// Documentation: https://developers.google.com/accounts/docs/OAuth2#serviceaccount
    /// 
    /// Note: Not all APIs support service accounts I cant garentee this will work.   If you find an api that doesnt support service accoutns contact me 
    ///       me at www.daimto.com and I will remove it from auto genration of this APIs sample project.
    /// </summary>
    /// <param name="serviceAccountEmail">From Google Developer console https://console.developers.google.com</param>
    /// <param name="serviceAccountCredentialFilePath">Location of the Json Service account key file downloaded from Google Developer console https://console.developers.google.com</param>
    /// <returns>DriveService used to make requests against the Drive API</returns>
    public static DriveService AuthenticateServiceAccount(string serviceAccountCredentialFilePath)
    {
        try
        {
            if (string.IsNullOrEmpty(serviceAccountCredentialFilePath))
                throw new Exception("Path to the .JSon service account credentials file is required.");
            if (!File.Exists(serviceAccountCredentialFilePath))
                throw new Exception("The service account credentials .JSon file does not exist at:" + serviceAccountCredentialFilePath);

            // These are the scopes of permissions you need. It is best to request only what you need and not all of them
            string[] scopes = new string[] { DriveService.Scope.Drive,                   // View and manage the files in your Google Drive
                                             DriveService.Scope.DriveAppdata,            // View and manage its own configuration data in your Google Drive
                                             DriveService.Scope.DriveFile,               // View and manage Google Drive files and folders that you have opened or created with this app
                                             DriveService.Scope.DriveMetadata,           // View and manage metadata of files in your Google Drive
                                             DriveService.Scope.DriveMetadataReadonly,   // View metadata for files in your Google Drive
                                             DriveService.Scope.DrivePhotosReadonly,     // View the photos, videos and albums in your Google Photos
                                             DriveService.Scope.DriveReadonly,           // View the files in your Google Drive
                                             DriveService.Scope.DriveScripts};           // Modify your Google Apps Script scripts' behavior
            Stream stream = new FileStream(serviceAccountCredentialFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
            var credential = GoogleCredential.FromStream(stream).CreateScoped(scopes);

            // Create the  Drive service.
            return new DriveService(new BaseClientService.Initializer()
            {
                HttpClientInitializer = credential,
                ApplicationName = "Drive Authentication Sample",
            });
        }
        catch (Exception ex)
        {
            Console.WriteLine("Create service account DriveService failed" + ex.Message);
            throw new Exception("CreateServiceAccountDriveServiceFailed", ex);
        }
    }

Let me know if you need anything else I have a partial sample project built.