What’s the cleanest way to handle the envelope structure when Genesys Cloud pushes a webhook to an AWS Lambda function using Node.js 18.x? I’ve got a custom agent desktop extension that needs to react immediately to conversation:participant:updated events, specifically when the routing.queue changes. The idea is to trigger a screen pop based on the new queue context without polling.
I’ve set up the webhook in the Genesys Cloud admin console pointing to my Lambda’s HTTPS endpoint. The test sends through fine, but when I look at the event object in the Lambda handler, it’s nested deep inside event.Records. I’m not sure if I should be iterating over event.Records or if the platform SDK handles that flattening for me. Here’s the current handler logic:
exports.handler = async (event) => {
// Genesys sends an array of events in the body
const records = event.Records || [];
for (const record of records) {
const body = JSON.parse(record.body);
console.log('Event Type:', body.eventType);
if (body.eventType === 'conversation:participant:updated') {
await processParticipantUpdate(body);
}
}
return { statusCode: 200, body: JSON.stringify({ status: 'ok' }) };
};
The issue is that record.body sometimes comes in as a string, sometimes as an object, depending on how the webhook trigger is configured (JSON vs Form-URL encoded). When it’s a string, JSON.parse works. When it’s already an object, it throws a SyntaxError. I’ve tried adding a check with typeof record.body === 'string', but it feels brittle.
Also, is there a specific header I need to validate for the Genesys signature? The docs mention a X-Genesys-Signature header, but I’m not seeing it in the test payloads from the sandbox environment. Am I missing a config step in the webhook settings, or is that only for production environments? I want to make sure I’m not just accepting any random POST to this endpoint.
The payload structure for the participant update looks like this:
{
"eventType": "conversation:participant:updated",
"payload": {
"id": "12345",
"routing": {
"queue": {
"id": "new-queue-id"
}
}
}
}
Any advice on robustly parsing the event envelope and verifying the source would be appreciated. I’d rather not write a custom middleware layer if there’s a standard pattern I’m missing.