protected override Task ApplyResponseChallengeAsync()
{
if (Response.StatusCode != 401)
{
return(Task.FromResult <object>(null));
}
AuthenticationResponseChallenge challenge = Helper.LookupChallenge(Options.AuthenticationType, Options.AuthenticationMode);
if (challenge != null)
{
string baseUri =
Request.Scheme +
Uri.SchemeDelimiter +
Request.Host +
Request.PathBase;
string currentUri =
baseUri +
Request.Path +
Request.QueryString;
string redirectUri =
baseUri +
Options.CallbackPath;
AuthenticationProperties properties = challenge.Properties;
if (string.IsNullOrEmpty(properties.RedirectUri))
{
properties.RedirectUri = currentUri;
}
// OAuth2 10.12 CSRF
GenerateCorrelationId(properties);
var queryStrings = new Dictionary <string, string>(StringComparer.OrdinalIgnoreCase);
queryStrings.Add("response_type", "code");
queryStrings.Add("client_id", Options.ClientId);
queryStrings.Add("redirect_uri", redirectUri);
// space separated
string scope = string.Join(" ", Options.Scope);
if (string.IsNullOrEmpty(scope))
{
// Google OAuth 2.0 asks for non-empty scope. If user didn't set it, set default scope to
// "openid profile email" to get basic user information.
scope = "openid profile email";
}
AddQueryString(queryStrings, properties, "scope", scope);
AddQueryString(queryStrings, properties, "access_type", Options.AccessType);
AddQueryString(queryStrings, properties, "approval_prompt");
AddQueryString(queryStrings, properties, "login_hint");
string state = Options.StateDataFormat.Protect(properties);
queryStrings.Add("state", state);
string authorizationEndpoint = WebUtilities.AddQueryString(AuthorizeEndpoint,
queryStrings);
var redirectContext = new GoogleOAuth2ApplyRedirectContext(
Context, Options,
properties, authorizationEndpoint);
Options.Provider.ApplyRedirect(redirectContext);
}
return(Task.FromResult <object>(null));
}
/// <summary>
/// Called when a Challenge causes a redirect to authorize endpoint in the Google OAuth 2.0 middleware
/// </summary>
/// <param name="context">Contains redirect URI and <see cref="AuthenticationProperties"/> of the challenge </param>
public virtual void ApplyRedirect(GoogleOAuth2ApplyRedirectContext context)
{
OnApplyRedirect(context);
}