Twilio - Validating Incoming Callback Request - Java

问题

When Twilio invokes a callback method to fetch the TwiML <Say> for Voice, I see that Twilio sets "x-twilio-signature" in the HTTP header.

I need to verify that the actual request came from Twilio.

I have a simple war file running on Tomcat and the app is built using Spring.

I did something like the following:

//Get the TwilioUtils object initialized
TwilioUtils twilioUtils = new TwilioUtils("******myAuthToken");

//Get the URL from HttpRequest
String url = httpRequest.getRequestURL().toString();
Map<String, String> allRequestParams = getAllRequestParams(httpRequest);
Map<String, String> headers = getAllRequestHeaders(httpRequest);

//Get the signature generated for the Url and request parameters 
//allRequestParams is a map of all request values posted to my service by Twilio
String validSig = twilioUtils.getValidationSignature(url, allRequestParams);

//Get the x-twilio-signature value from the http header map
String xTwilioSignature = headers.get("x-twilio-signature”);

//This is different from what I get below
logger.info("validSig = " + validSig);
logger.info("xTwilioSignature = " + xTwilioSignature );
//This is always false
logger.info("Signature matched : " +  twilioUtils.validateRequest(xTwilioSignature, url,
   allRequestParams));

I would like to know what am I doing wrong. Is my approach to validate "x-twilio-signature" incorrect?

If it is incorrect, what's the right way to do it?

I am using the helper library class TwilioUtils provided by Twilio to validate it.

All the time the signature from Twilio is different from what I get from the TwilioUtils object.

回答1:

Megan from Twilio here.

Are you following the steps suggested in the security documentation?

validateRequest expects three arguments. I believe you're missing the url there.

Consider this example:

public class TwilioUtilsExample {

    public static void main(String[] args) {

        // Account details
        String accountSid = "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
        String authToken = "YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY";

        //This is the signature we expect
        String expected_sig = "SSSSSSSSSSSSSSSSSSSSSSSSSSSS";

        //This is the url that twilio requested
        String url = "http://UUUUUUUUUUUUUUU";

        //These are the post params twilio sent in its request
        Map<String,String> params = new HashMap<String,String>();

        // Be sure to see the signing notes at twilio.com/docs/security
        TwilioUtils util = new TwilioUtils(authToken, accountSid);

        boolean result = util.validateRequest(expected_sig, url, params);

        if (result) {
            System.out.print( "The signature is valid!\n" );
        } else {
            System.out.print( "The signature was NOT VALID.  It might have been spoofed!\n" );
        }

    }

}

Hope this is helpful!

来源：https://stackoverflow.com/questions/34098140/twilio-validating-incoming-callback-request-java

标签

java

validation

callback

twilio