My WinForms app needs to access one of the Google API's (Calendar). For this, the app needs to have authorization, and Google has provided OAuth 2 for this purpose. I've read everything on their docs site here.
From another documentation page on Google I learned how to get the authorization key via a browser request. This takes place in a Console C# application. What it does is:
var provider = new NativeApplicationClient(GoogleAuthenticationServer.Description, CLIENT_ID, CLIENT_SECRET);
var auth = new OAuth2Authenticator<NativeApplicationClient>(provider, GetAuthorization);
var service = new CalendarService(auth);
string id = <calendar id>;
Calendar calendar = service.Calendars.Get(id).Fetch();
At the last line, a browser window is opened with a Google page asking me to allow the app access to my Google account. In the console application, a ReadLine() is waiting for input. This comes from the GetAuthorization method:
private static IAuthorizationState GetAuthorization(NativeApplicationClient arg)
{
// Get the auth URL:
IAuthorizationState state = new AuthorizationState(new[] { CalendarService.Scopes.Calendar.GetStringValue() });
state.Callback = new Uri(NativeApplicationClient.OutOfBandCallbackUrl);
Uri authUri = arg.RequestUserAuthorization(state);
// Request authorization from the user (by opening a browser window):
Process.Start(authUri.ToString());
Console.Write(" Authorization Code: ");
string authCode = Console.ReadLine();
Console.WriteLine();
// Retrieve the access token by using the authorization code:
return arg.ProcessUserAuthorization(authCode, state);
}
So I grant my app access to my Gmail account, and I get a code in return. This code I paste back into the console window, and the rest of the app does its work as it should (in my case, making a new Calendar event).
But my problem is the fact that I want this functionality in a WinForms app, not a Console app. I have not been able to find anything on Google's pages regarding this.
What I have so far:
- User clicks a button, the browser is opened and the user grants access and retrieves the code.
- User pastes this code into the app.
- Another button is clicked, and this is where I would like to use the user-entered code for the authorization process. This is a string, and I don't know how to combine this with all the authentication methods written in the top of this post.
I have a feeling it could be possible with the use of Google's REST client instead of the native .NET libraries, but I sincerely want to use the .NET libraries instead of REST.
