public virtual bool HandleAuthChallenge(HttpHost host, HttpResponse response, AuthenticationStrategy
authStrategy, AuthState authState, HttpContext context)
{
try
{
if (this.log.IsDebugEnabled())
{
this.log.Debug(host.ToHostString() + " requested authentication");
}
IDictionary <string, Header> challenges = authStrategy.GetChallenges(host, response
, context);
if (challenges.IsEmpty())
{
this.log.Debug("Response contains no authentication challenges");
return(false);
}
AuthScheme authScheme = authState.GetAuthScheme();
switch (authState.GetState())
{
case AuthProtocolState.Failure:
{
return(false);
}
case AuthProtocolState.Success:
{
authState.Reset();
break;
}
case AuthProtocolState.Challenged:
case AuthProtocolState.Handshake:
{
if (authScheme == null)
{
this.log.Debug("Auth scheme is null");
authStrategy.AuthFailed(host, null, context);
authState.Reset();
authState.SetState(AuthProtocolState.Failure);
return(false);
}
goto case AuthProtocolState.Unchallenged;
}
case AuthProtocolState.Unchallenged:
{
if (authScheme != null)
{
string id = authScheme.GetSchemeName();
Header challenge = challenges.Get(id.ToLower(CultureInfo.InvariantCulture));
if (challenge != null)
{
this.log.Debug("Authorization challenge processed");
authScheme.ProcessChallenge(challenge);
if (authScheme.IsComplete())
{
this.log.Debug("Authentication failed");
authStrategy.AuthFailed(host, authState.GetAuthScheme(), context);
authState.Reset();
authState.SetState(AuthProtocolState.Failure);
return(false);
}
else
{
authState.SetState(AuthProtocolState.Handshake);
return(true);
}
}
else
{
authState.Reset();
}
}
}
}
// Retry authentication with a different scheme
Queue <AuthOption> authOptions = authStrategy.Select(challenges, host, response, context
);
if (authOptions != null && !authOptions.IsEmpty())
{
if (this.log.IsDebugEnabled())
{
this.log.Debug("Selected authentication options: " + authOptions);
}
authState.SetState(AuthProtocolState.Challenged);
authState.Update(authOptions);
return(true);
}
else
{
return(false);
}
}
catch (MalformedChallengeException ex)
{
if (this.log.IsWarnEnabled())
{
this.log.Warn("Malformed challenge: " + ex.Message);
}
authState.Reset();
return(false);
}
}