已安装的应用程序的Google Drive Api c＃

Question

Can someone please show a working example code of how to use google drive api for installed application? ( access_type=offline) I found a few explanations, but can't get to a working flow.

Thanks

Answer 1

Ok, What I used at least was not 'installed application', but 'web application'. These are the steps to do:

1. Go to Google Developers Console and create a project.

2. Go to APIs & Auth

3. On APIs enable Drive API & Drive SDK.

4.On Credentials Create new Client ID for Web Application (Create your Consent screen, evev though we won't use it.)

In the Create Client ID window, add the url " https://developers.google.com/oauthplayground " to the AUTHORIZED REDIRECT URIS.

5.Go to the url you added on number 4

6.Click the gear on the right and configure:

OAuth flow: Server-side

Access type: Offline

Use your own OAuth credentials: Tick

Then copy your Client ID & Secret from the console.

7.On the left, choose Drive API -> https://www.googleapis.com/auth/drive , click Authorize APIs

8.A new window will open, asking you to accept Google OAuth... click Accept.

9.Click Exchange authorizaion code for tokens.

10.Copy & Save the Acess & Refresh tokens.

The code:

private static DriveService CreateServie(string applicationName)
{
  var tokenResponse = new TokenResponse
  {
    AccessToken = yourAccessToken,
    RefreshToken = yourRefreshToken,
  };

  var apiCodeFlow = new GoogleAuthorizationCodeFlow(new GoogleAuthorizationCodeFlow.Initializer
  {
    ClientSecrets = new ClientSecrets
    {
      ClientId = yourClientID,
      ClientSecret = yourClientSecret
    },
    Scopes = new[] { DriveService.Scope.Drive },
    DataStore = new FileDataStore(applicationName)
  });

  var credential = new UserCredential(apiCodeFlow, yourEMail, tokenResponse);

  var service = new DriveService(new BaseClientService.Initializer
  {
    HttpClientInitializer = credential,
    ApplicationName = applicationName
  });

  return service;
}

Answer 2

This is my helper class I use Kinda tweeked it for you for Google Drive. Remember a Service account is NOT YOU. Just because you create it does not mean that it will have access to the files on your Google drive account. Service accounts are there own entity there own sudu user. This creates the basic drive service that you can use to follow the other tutorials I have created that use normal Oauth2

/// <summary>
/// Authenticating to Google using a Service account
/// Documentation: https://developers.google.com/accounts/docs/OAuth2#serviceaccount
/// </summary>
/// <param name="serviceAccountEmail">From Google Developer console https://console.developers.google.com</param>
/// <param name="keyFilePath">Location of the Service account key file downloaded from Google Developer console https://console.developers.google.com</param>
/// <returns></returns>
public static DriveService AuthenticateServiceAccount(string serviceAccountEmail, string keyFilePath)
{

    // check the file exists
    if (!File.Exists(keyFilePath))
    {
        Console.WriteLine("An Error occurred - Key file does not exist");
        return null;
    }

    string[] scopes = new string[] { DriveService.Scope.Drive};     // View analytics data            

    var certificate = new X509Certificate2(keyFilePath, "notasecret", X509KeyStorageFlags.Exportable);
    try
    {
        ServiceAccountCredential credential = new ServiceAccountCredential(
            new ServiceAccountCredential.Initializer(serviceAccountEmail)
            {
                Scopes = scopes
            }.FromCertificate(certificate));

        // Create the service.
        DriveService service = new DriveService(new BaseClientService.Initializer()
        {
            HttpClientInitializer = credential,
            ApplicationName = "Drive API Sample",
        });
        return service;
    }
    catch (Exception ex)
    {

        Console.WriteLine(ex.InnerException);
        return null;

    }
}

you call it like this

var x = AuthenticationHelper.AuthenticateServiceAccount("46123799103-6v9cj8jbub068jgmss54m9gkuk4q2qu8@developer.gserviceaccount.com",@"C:\Users\LL\Downloads\Diamto Test Everything Project-e8bf61cc9963.p12");

Tutorial : Google Drive API with Service Account C#