public virtual void OnRequestIncome(RequestHeader header)
{
}
/// <summary>
/// Processes Alexa request AND validates request signature
/// </summary>
/// <param name="httpRequest"></param>
/// <returns></returns>
public virtual async Task <HttpResponseMessage> GetResponseAsync(HttpRequestMessage httpRequest)
{
DateTime now = DateTime.UtcNow; // reference time for this request
RequestHeader requestHeader = new RequestHeader();
requestHeader.Read(httpRequest);
await OnRequestIncomeAsync(requestHeader);
#if HasBouncyCastle
var cerValidator = new BouncyCastleCertValidator();
#else
var cerValidator = new DotNetCertValidator();
#endif
var validationResult = await cerValidator.VerifyAsync(requestHeader);
if (!await OnRequestValidationAsync(requestHeader, validationResult))
{
return(new HttpResponseMessage(HttpStatusCode.BadRequest)
{
ReasonPhrase = validationResult.ToString()
});
}
try
{
RequestEnvelope = SpeechletRequestEnvelope.FromJson(requestHeader.RequestAsString);
if (!SpeechletRequestTimestampVerifier.VerifyRequestTimestamp(RequestEnvelope, now))
{
validationResult = validationResult | SpeechletRequestValidationResult.InvalidTimestamp;
}
}
catch (Exception e1)
{
await OnParsingErrorAsync(e1);
validationResult = SpeechletRequestValidationResult.InvalidJson;
}
try
{
string alexaResponsejson = await DoProcessRequestAsync(RequestEnvelope);
if (alexaResponsejson == null)
{
await OnResponseOutgoingAsync("->alexaResponsejson == null");
return(null);
}
await OnResponseOutgoingAsync(alexaResponsejson);
return(new HttpResponseMessage(HttpStatusCode.OK)
{
Content = new StringContent(alexaResponsejson, Encoding.UTF8, "application/json")
});;
}
catch (NotImplementedException)
{
return(null);
}
catch (Exception e2)
{
await OnParsingErrorAsync(e2);
return(new HttpResponseMessage(HttpStatusCode.InternalServerError));
}
}
/// <summary>
/// Opportunity to set policy for handling requests with invalid signatures and/or timestamps
/// </summary>
/// <returns>true if request processing should continue, otherwise false</returns>
public virtual bool OnRequestValidation(RequestHeader header, SpeechletRequestValidationResult result)
{
return(result == SpeechletRequestValidationResult.OK);
}