protected override async Task HandleChallengeAsync(AuthenticationProperties properties)
{
AuthenticateResult authResult = await HandleAuthenticateOnceSafeAsync();
HmacChallengeContext eventContext = new HmacChallengeContext(Context, Scheme, Options, properties)
{
AuthenticationFailure = authResult?.Failure
};
if (Options.IncludeErrorDetails && eventContext.AuthenticationFailure != null)
{
eventContext.Error = "invalid_key";
eventContext.ErrorDescription = CreateErrorDescription(eventContext.AuthenticationFailure);
}
await Events.Challenge(eventContext);
if (eventContext.Handled)
{
return;
}
Response.StatusCode = 401;
if (string.IsNullOrEmpty(eventContext.Error) &&
string.IsNullOrEmpty(eventContext.ErrorDescription) &&
string.IsNullOrEmpty(eventContext.ErrorUri))
{
Response.Headers.Append(Microsoft.Net.Http.Headers.HeaderNames.WWWAuthenticate, Options.Challenge);
}
else
{
StringBuilder builder = new StringBuilder(Options.Challenge);
if (Options.Challenge.IndexOf(" ", StringComparison.Ordinal) > 0)
{
builder.Append(",");
}
if (!string.IsNullOrEmpty(eventContext.Error))
{
builder.Append(" error=\"");
builder.Append(eventContext.Error);
builder.Append("\"");
}
if (!string.IsNullOrEmpty(eventContext.ErrorDescription))
{
if (!string.IsNullOrEmpty(eventContext.Error))
{
builder.Append(",");
}
builder.Append(" error_description=\"");
builder.Append(eventContext.ErrorDescription);
builder.Append("\"");
}
if (!string.IsNullOrEmpty(eventContext.ErrorUri))
{
if (!string.IsNullOrEmpty(eventContext.Error) ||
!string.IsNullOrEmpty(eventContext.ErrorDescription))
{
builder.Append(",");
}
builder.Append(" error_uri=\"");
builder.Append(eventContext.ErrorUri);
builder.Append("\"");
}
Response.Headers.Append(Microsoft.Net.Http.Headers.HeaderNames.WWWAuthenticate, builder.ToString());
}
}
public virtual Task Challenge(HmacChallengeContext context) => OnChallenge(context);
