OAuth

gistfile1.txt

public class OAuthCredentialsStore : ICredentialStore
{
    private const string ClientId = "<redacted>";
    private const string ClientSecret = "<redacted>";
    private readonly IGitHubClient _gitHubClient;

    public OAuthCredentialsStore()
    {
        _gitHubClient = new GitHubClient(new ProductHeaderValue("HubBug", "0.0.0.1"))
        {
            Credentials = Credentials.Anonymous
        };
    }

    public async Task<Credentials> GetCredentials()
    {
        var state = Guid.NewGuid().ToString("N");

        const string redirectUri = "http://compiledexperience.com/windows-apps/hub-bug/authenticate";

        var uri = String.Format("https://github.com/login/oauth/authorize?client_id={0}&redirect_uri={1}&scope={2}&state={3}",
            ClientId, redirectUri, "user,repo", state);

        var result = await WebAuthenticationBroker.AuthenticateAsync(WebAuthenticationOptions.None,
            new Uri(uri), new Uri(redirectUri));

        if (result.ResponseStatus != WebAuthenticationStatus.Success)
            return Credentials.Anonymous;

        var responseUri = new Uri(result.ResponseData);

        var responseParameters = responseUri.ParseQueryString();

        if (state != responseParameters["state"])
            return Credentials.Anonymous;

        var contentParams = new Dictionary<string, string>
            {
                {"client_id", ClientId },
                {"client_secret", ClientSecret },
                {"code", responseParameters["code"] },
                {"state", state }
            };

        var content = String.Join("&", contentParams.Select(p => String.Format("{0}={1}", p.Key, p.Value)));

        var response = await _gitHubClient.Connection.PostAsync<OAuthToken>(new Uri("https://github.com/login/oauth/access_token", UriKind.Absolute), content, "application/json", "application/x-www-form-urlencoded");

        return new Credentials(response.BodyAsObject.AccessToken);
    }
}