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);
// comma separated
string scope = string.Join(",", Options.Scope);
string state = Options.StateDataFormat.Protect(properties);
string authorizationEndpoint =
Options.AuthorizationEndpoint +
"?response_type=code" +
"&client_id=" + Uri.EscapeDataString(Options.AppId) +
"&redirect_uri=" + Uri.EscapeDataString(redirectUri) +
"&scope=" + Uri.EscapeDataString(scope) +
"&state=" + Uri.EscapeDataString(state);
var redirectContext = new FacebookApplyRedirectContext(
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 Facebook middleware
/// </summary>
/// <param name="context">Contains redirect URI and <see cref="AuthenticationProperties"/> of the challenge </param>
public virtual void ApplyRedirect(FacebookApplyRedirectContext context)
{
OnApplyRedirect(context);
}