Function webhookHandler

integrations/typeform/src/index.ts:295–339

(event: HandlerEvent<"HTTP">, logger: Logger)

}

async function webhookHandler(event: HandlerEvent<"HTTP">, logger: Logger) {
  logger.debug("[inside typeform integration] Handling typeform webhook handler");

  const { rawEvent: request, source } = event;

  if (!request.body) {
    logger.debug("[inside typeform integration] No body found");

    return;
  }

  const rawBody = await request.text();

  const signature = request.headers.get("typeform-signature");

  if (!signature) {
    logger.debug("[inside typeform integration] No signature found");

    return { events: [] };
  }

  const hash = createHmac("sha256", source.secret).update(rawBody).digest("base64");

  const actualSig = `sha256=${hash}`;

  if (signature !== actualSig) {
    logger.debug("[inside typeform integration] Signature does not match, ignoring");

    return { events: [] };
  }

  const payload = safeParseBody(rawBody);

  return {
    events: [
      {
        id: payload.event_id,
        name: payload.event_type,
        source: SOURCE,
        payload,
        context: {},
      },
    ],
  };
}

function isWebhookData(data: any): data is GetWebhookResponse {
  return typeof data === "object" && data !== null && typeof data.id === "string";