How do I write a VB or C # GUI client for DotNetOpenAuth?
I am learning how to use the Google Calendar API, which in turn requires me to learn how to use DotNetOpenAuth to access a Google account. I did the provided work samples and wrote working code in the Console to access and manage the Calendar.
Now I want to write a Windows Form Application (in C # or VB) to do the same. I cannot get the OAuth2 process to work in a GUI application. It compiles and runs but doesn't work. Based on what I've seen so far, I've come to the conclusion that the GetAuthorization () function is not being called.
I tried to start the process from a button click, from the constructor and from the Loader method of the form. I've tried in both C # and VB.
public GoogleCal()
{
InitializeComponent();
var provider = new NativeApplicationClient(
GoogleAuthenticationServer.Description);
provider.ClientIdentifier = "xxxxx.apps.googleusercontent.com";
provider.ClientSecret = "yyyyy";
var auth = new OAuth2Authenticator<NativeApplicationClient>(
provider, GetAuthorization);
}
private 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());
authCodeText = Microsoft.VisualBasic.Interaction.InputBox(
"Paste code:", "title", "");
// Retrieve the access token by using the authorization code:
return arg.ProcessUserAuthorization(authCodeText, state);
}
I'm obviously doing something wrong, but I can't figure out what it is. Any ideas?
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Using the tutorial at whelkaholism.blogspot I was able to do what I wanted. I took a slightly different approach (in part to leverage the later OAuth2).
Following is the code for a C # form program.
// Add references:
// DotNetOpenAuth.dll
// Google.Apis.dll
// Google.Apis.Authentication.OAth2.dll
// Newtonsoft.Json.Net35.dll
// plus, add references for whichever Google App(s) you want
// Google.Apis.Calendar.v3.dll
// form contains at least the following:
// button1: Button, start the authentication process
// authCode: TextBox, to recive the auth code from Google
// button2: Button, complete the authentication prop
// textBox2: TextBox, multi-line, to display status message and output
// in addition to the libraries required for any forms program, use:
using System.Diagnostics;
using DotNetOpenAuth.OAuth2;
using Google.Apis.Authentication.OAuth2;
using Google.Apis.Authentication.OAuth2.DotNetOpenAuth;
using Google.Apis.Calendar.v3;
using Google.Apis.Calendar.v3.Data;
using Google.Apis.Util;
// methods not related to authentication deleted for space
namespace GoogleCal
{
public partial class GoogleCal : Form
{
private static String NL = Environment.NewLine;
private static IAuthorizationState state;
private static NativeApplicationClient provider;
private static OAuth2Authenticator<NativeApplicationClient> auth;
private static CalendarService calService;
private void button1_Click(object sender, EventArgs e)
{
// clicked to initiate authentication process
// provider and state are declared above as private static
provider = new NativeApplicationClient(GoogleAuthenticationServer.Description);
provider.ClientIdentifier = "<my id>.apps.googleusercontent.com";
provider.ClientSecret = "<my secret>";
// next line changes if you want to access something other than Calendar
state = new AuthorizationState(new[] { CalendarService.Scopes.Calendar.GetStringValue() });
state.Callback = new Uri(NativeApplicationClient.OutOfBandCallbackUrl);
Uri authUri = provider.RequestUserAuthorization(state);
Process.Start(authUri.ToString());
}
private void button2_Click(object sender, EventArgs e)
{
// clicked after Google code is pasted into TextBox to complete authentication process
// auth and calService are declared above as private static
auth = new OAuth2Authenticator<NativeApplicationClient>(provider, GetAuthorization);
// create the service object to use in other methods
calService = new CalendarService(auth);
textBox2.AppendText("Ready" + NL);
textBox2.Update();
}
private IAuthorizationState GetAuthorization(NativeApplicationClient arg)
{
// state is declared above as private static
// authCode is a TextBox on the form
return arg.ProcessUserAuthorization(authCode.Text, state);
}
}
}
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