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.
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votes
1 Answers
1
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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
/// <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.
