Revoke access granted to my app Google Drive API

Question

How do I revoke access that has been granted to my Google Drive web application so that upon the user's next use he is asked for permissions afresh?

Answer 1

In order to revoke the access go to the below url

https://security.google.com/settings/security/permissions?pli=1

Choose your apps that you need to revoke and click on remove.

Answer 2

For revoking your access token, you need to "GET" (!) this url: https://accounts.google.com/o/oauth2/revoke?token={token} where {token} is the value of your token, as explained here: https://developers.google.com/accounts/docs/OAuth2WebServer#tokenrevoke

For Java API (don't know for other languages), as of 9th of Sept 2012, there is no API for this. I managed to revoke a token with this code:

class myGoogleApi {
    private static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();

    ...

    public revoke(String token) {
        HttpRequestFactory factory = HTTP_TRANSPORT.createRequestFactory();
        GoogleUrl url = new GoogleUrl("https://accounts.google.com/o/oauth2/revoke?token="+token);
        HttpRequest request = factory.buildGetRequest(url);
        HttpResponse response = request.execute();
        ...
    }