/// <summary>
/// Attempts to post-authenticate a request given an unauthorized response using
/// the Bearer challenge cache and the application supplied AuthenticationCallback.
/// </summary>
/// <param name="url">The unauthorized response</param>
/// <returns>The access token to use for the request</returns>
protected string PostAuthenticate(HttpResponseMessage response)
{
// An HTTP 401 Not Authorized error; handle if an authentication callback has been supplied
if (OnAuthenticate != null)
{
// Extract the WWW-Authenticate header and determine if it represents an OAuth2 Bearer challenge
var authenticateHeader = response.Headers.WwwAuthenticate.ElementAt(0).ToString();
if (HttpBearerChallenge.IsBearerChallenge(authenticateHeader))
{
var challenge = new HttpBearerChallenge(response.RequestMessage.RequestUri, authenticateHeader);
if (challenge != null)
{
// Update challenge cache
HttpBearerChallengeCache.GetInstance().SetChallengeForURL(response.RequestMessage.RequestUri, challenge);
// We have an authentication challenge, use it to get a new authorization token
return(OnAuthenticate(challenge.AuthorizationServer, challenge.Resource, challenge.Scope));
}
}
}
return(null);
}
/// <summary>
/// Attempts to pre-authenticate a request to the specified vault or key URL using
/// the Bearer challenge cache and the application supplied AuthenticationCallback.
/// </summary>
/// <param name="url">The vault or key URL</param>
/// <returns>The access token to use for the request</returns>
protected string PreAuthenticate(Uri url)
{
if (OnAuthenticate != null)
{
var challenge = HttpBearerChallengeCache.GetInstance().GetChallengeForURL(url);
if (challenge != null)
{
return(OnAuthenticate(challenge.AuthorizationServer, challenge.Resource, challenge.Scope));
}
}
return(null);
}
/// <summary>
/// Updates the <see cref="HttpBearerChallengeCache"/> when the specified response has a return code of 401
/// </summary>
/// <param name="response">The response to evaluate</param>
/// <param name="cancellationToken">The cancellation token</param>
/// <returns></returns>
protected override HttpResponseMessage ProcessResponse(HttpResponseMessage response, CancellationToken cancellationToken)
{
// if the response came back as 401 and the response contains a bearer challenge update the challenge cache
if (response.StatusCode == System.Net.HttpStatusCode.Unauthorized)
{
HttpBearerChallenge challenge = HttpBearerChallenge.GetBearerChallengeFromResponse(response);
if (challenge != null)
{
// Update challenge cache
HttpBearerChallengeCache.GetInstance().SetChallengeForURL(response.RequestMessage.RequestUri, challenge);
}
}
return(response);
}
private static void AssertChallengeCacheEntry(string requestUrl, MockChallenge expChallenge)
{
var actChallenge = HttpBearerChallengeCache.GetInstance().GetChallengeForURL(new Uri(requestUrl));
if (expChallenge == null)
{
Assert.Null(actChallenge);
}
else
{
Assert.NotNull(actChallenge);
Assert.Equal(expChallenge.AuthorizationServer, actChallenge.AuthorizationServer);
Assert.Equal(expChallenge.Scope, actChallenge.Scope);
Assert.Equal(expChallenge.Resource, actChallenge.Resource);
}
}
public async Task CacheUpdateOn401Async()
{
string requestUrlBase = CreateMockUrl();
string requestUrl1 = CreateMockUrl(requestUrlBase, 2);
HttpBearerChallengeCache.GetInstance().SetChallengeForURL(new Uri(requestUrl1), MockChallenge.Create().ToHttpBearerChallenge(requestUrl1));
string requestUrl2 = CreateMockUrl(requestUrlBase, 2);
var handler = new ChallengeCacheHandler();
var expChallenge = MockChallenge.Create();
handler.InnerHandler = new StaticChallengeResponseHandler(HttpStatusCode.Unauthorized, expChallenge.ToString());
var client = new HttpClient(handler);
var _ = await client.SendAsync(new HttpRequestMessage(HttpMethod.Get, requestUrl2));
AssertChallengeCacheEntry(requestUrl1, expChallenge);
AssertChallengeCacheEntry(requestUrl2, expChallenge);
}