why rawBody?

[GaikwadPratik]

@mreinstein This is not issue. But I wanted to know why are you processing rawBody from express.request. What would happen if req.body is sent instead of req.rawBody?

[mreinstein]

@GaikwadPratik I don't see rawBody used anywhere in this module. Can you point me at the code you're looking at?

[GaikwadPratik]

In the readme.md it is mentioned to use as verifier(cert_url, signature, requestRawBody, callback). Hence I was asking about requestRawBody.

I am working on an alexa app using express. I have consumed alexa-middleware as below "server.js"

this.expressApp.use(bodyParser.json({
            verify: function getRawBody(req, res, buf) {//This needs to be done because rawbody is required
                req['rawBody'] = buf.toString();
            }
        }));

In "route.js", this is called on a post route invoked by alexa

alexaVerifier(
            req.headers.signaturecertchainurl,
            req.headers.signature,
            req['rawBody'],//TODO:: test with body or (<any>req).rawBody
            function verificationCallBack(err) {
                if (err)
                    res.status(401).json({ message: 'Verification Failure', error: err });
                else
                    next();
            }
        );

But I am getting below error on Heroku server:

2017-07-21T19:35:47.829522+00:00 app[web.1]:     at VerifyApplicationRequest (/app/ServerCode/Routes/Routes.js:34:37)

2017-07-21T19:35:47.829523+00:00 app[web.1]:     at Layer.handle [as handle_request] (/app/node_modules/express/lib/router/layer.js:95:5)

2017-07-21T19:35:47.829523+00:00 app[web.1]:     at next (/app/node_modules/express/lib/router/route.js:137:13)

2017-07-21T19:35:47.829524+00:00 app[web.1]:     at verificationCallBack (/app/ServerCode/Routes/Routes.js:22:17)

2017-07-21T19:35:47.829524+00:00 app[web.1]:     at /app/node_modules/alexa-verifier/index.js:98:5

2017-07-21T19:35:47.829525+00:00 app[web.1]:     at /app/node_modules/alexa-verifier/index.js:31:5

2017-07-21T19:35:47.829525+00:00 app[web.1]:     at Request._callback (/app/node_modules/alexa-verifier/fetch-cert.js:22:7)

2017-07-21T19:35:47.829526+00:00 app[web.1]:     at Request.self.callback (/app/node_modules/request/request.js:188:22)

2017-07-21T19:35:47.829526+00:00 app[web.1]:     at emitTwo (events.js:106:13)

2017-07-21T19:35:47.829527+00:00 app[web.1]:     at Request.emit (events.js:192:7)

2017-07-21T19:35:47.907860+00:00 app[web.1]: (node:4) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: Can't set headers after they are sent.

2017-07-21T19:35:47.907960+00:00 app[web.1]: (node:4) DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

2017-07-21T19:35:47.839209+00:00 heroku[router]: at=info method=POST path="/Notes/SaveNotes" host=alexaskillnotesapp.herokuapp.com request_id=4e73ea7f-5492-444a-89c5-4a4830ea8ab2 fwd="72.21.217.182" dyno=web.1 connect=1ms service=157ms status=404 bytes=255 protocol=https```

can you please help me in resolving it?

[mreinstein]

@GaikwadPratik have you tried https://www.npmjs.com/package/alexa-verifier-middleware

If you're using express this middleware works very well. And it uses alexa-verifier (this module) under the hood, handling all the express plumbing for you.