WooCommerce Webhook Template - For Lambda

woocommerce-webhook-order-update.js

const crypto = require('crypto');

function validateRequest (event) {
    // GET Secret from Environment Variable
    const { WC_SECRET } = process.env;

    // Get Header with Hash to validate from header (event.header)
    const wc_hmac_hash = event.headers ? 
        event.headers['X-WC-Webhook-Signature'] || event.headers['x-wc-webhook-signature']
        : "";

    // Calculate Hash from content (event.body)
    const content_hmac_hash = crypto.createHmac("sha256", WC_SECRET)
                                .update(Buffer.from(event.body, "utf8"))
                                .digest("base64");
                                
    if(content_hmac_hash !== wc_hmac_hash) {
        //Request Integrity check failed; Invalid Webhook
        console.log('Integrity of request compromised, aborting');
        return false;
    }
    
    // Valid Webhook
    return true;
}

async function processPurchase(data) {
    //Add code here to process purchase , notify user , etc
    const { status } = data;
    
    switch(status) {
        case "processing": {
            console.log('OnOrderUpdated');
        }
        break;
        case "completed": {
            console.log('OnOrderCompleted');
        }
        break;
        default: {
            //Log data
            console.log(`Unknown event ${status}`);
        }
        break;
    }
}

// Use API Gateway Lambda Proxy to include header in event object
exports.handler = async (event) => {
    let response;
    if(!validateRequest(event)) {
        response = {
            statusCode: 400,
            body: JSON.stringify("Bad request"),
        };
        return response;
    } else {
        const data = JSON.parse(event.body);
        await processPurchase(data);
        response = {
            statusCode: 200,
            body: JSON.stringify('Process Completed'),
        };
        return response;
    }
};