Webhooks Overview

import hmac
import hashlib

def verify_signature(body: bytes, signature: str, secret: str) -> bool:
    expected = hmac.new(
        secret.encode("utf-8"),
        body,
        hashlib.sha256,
    ).hexdigest()
    return hmac.compare_digest(expected, signature or "")

# Example Flask handler
from flask import Flask, request, abort
app = Flask(__name__)

@app.post("/thunderphone-webhook")
def handle():
    body = request.get_data()
    sig = request.headers.get("X-ThunderPhone-Signature", "")
    if not verify_signature(body, sig, WEBHOOK_SECRET):
        abort(401)
    event = request.get_json()
    # dispatch on event["type"] …
    return "", 204

import crypto from "node:crypto";
import express from "express";

function verifySignature(body, signature, secret) {
  const expected = crypto
    .createHmac("sha256", secret)
    .update(body)
    .digest("hex");
  if (!signature || expected.length !== signature.length) return false;
  return crypto.timingSafeEqual(
    Buffer.from(expected),
    Buffer.from(signature),
  );
}

const app = express();
app.post(
  "/thunderphone-webhook",
  express.raw({ type: "application/json" }),
  (req, res) => {
    const sig = req.header("X-ThunderPhone-Signature") || "";
    if (!verifySignature(req.body, sig, process.env.WEBHOOK_SECRET)) {
      return res.sendStatus(401);
    }
    const event = JSON.parse(req.body.toString("utf8"));
    // dispatch on event.type …
    res.sendStatus(204);
  },
);