Getting exception on webhook from Stripe

问题

I'm trying to set up a webhook from Stripe to handle the payment_intent.succeeded event, but I get an exception. This is my code from the Node backend (I have extracted all the relevant parts I hope. Let me know if anything else is needed):

const stripeWebHookSecret = 'whsec_WA0Rh4vAD3z0rMWy4kv2p6XXXXXXXXXX';

import express from 'express';
const app = express();
app.use(bodyParser.urlencoded({ extended:true }));
app.use(bodyParser.json());
app.use(session({ <some params here> }));

const openRouter = express.Router();

registerOpenPaymentRoutes(openRouter);

app.use('/open', openRouter);

And the implementation of registerOpenPaymentRoutes looks like this:

export const registerOpenPaymentRoutes = (router) => {
    router.post('/payment/intent/webhook', bodyParser.raw({type: 'application/json'}), (req, res) => {
        let signature = req.headers['stripe-signature'];
        try {
            let event = stripe.webhooks.constructEvent(req.body, signature, stripeWebHookSecret);
            switch(event.type){
                case 'payment_intent.succeeded':
                    let intent = event.data.object;
                    res.json({ message: 'Everything went smooth!', intent });
                default:
                    res.status(400).json({ error: 'Event type not supported' });
            }
        }
        catch (error){
            res.status(400).json({ message: `Wrong signature`, signature, body: req.body, error });
        }
    });
}

So far so good.When I fire a test webhook event from the Stripe dashboard, I hit the endpoint, but get the result from the catch block. The error message is as follows:

No signatures found matching the expected signature for payload. Are you passing the raw request body you received from Stripe? https://github.com/stripe/stripe-node#webhook-signing"

I'm returning the signature with the error message as well as you see above, and the signature looks like this:

"t=1557911017,v1=bebf499bcb35198b8bfaf22a68b8879574298f9f424e57ef292752e3ce21914d,v0=23402bb405bfd6bd2a13c310cfecda7ae1905609923d801fa4e8b872a4f82894"

As far as I understand from the documentation, what is needed to get the raw request body as mentioned are the bodyParser.raw({type: 'application/json'})argument to the router that I already have there.

Can anyone see the missing part?

回答1:

It's because you've already set your express app to use the bodyParser.json() middleware, which clashes with the bodyParser.raw() middleware you set up in your webhook route.

If you remove the app.use(bodyParser.json()); line your webhooks will work as intended, but then the rest of your routes won't have a parsed body, which isn't ideal.

I suggest adding a custom middleware to choose the bodyParser version based on route. Something like:

// only use the raw bodyParser for webhooks
app.use((req, res, next) => {
  if (req.originalUrl === '/payment/intent/webhook') {
    next();
  } else {
    bodyParser.json()(req, res, next);
  }
});

Then explicitly use the bodyParser.raw() middleware on the webhook routes.

来源：https://stackoverflow.com/questions/56145563/getting-exception-on-webhook-from-stripe

标签

node.js

stripe-payments

webhooks