Eventos en tiempo real. Entregas firmadas con HMAC.

1import crypto from 'crypto';2import express from 'express';34const app = express();5const WEBHOOK_SECRET = process.env.PAPEROFFICE_WEBHOOK_SECRET;67app.post('/webhooks/paperoffice', express.raw({ type: 'application/json' }), (req, res) => {8  const signature = req.header('X-PaperOffice-Signature'); // "sha256=..."9  const eventId   = req.header('X-PaperOffice-Event-ID');10  const eventType = req.header('X-PaperOffice-Event');1112  const expected = 'sha256=' + crypto13    .createHmac('sha256', WEBHOOK_SECRET)14    .update(req.body)15    .digest('hex');1617  if (!signature || !crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected))) {18    return res.status(401).send('invalid signature');19  }2021  const event = JSON.parse(req.body.toString());22  // store eventId as idempotency key -> never process the same ID twice23  console.log(eventType, event.data);24  res.status(200).send('ok');25});

1import hmac, hashlib, os2from flask import Flask, request, abort34app = Flask(__name__)5WEBHOOK_SECRET = os.environ["PAPEROFFICE_WEBHOOK_SECRET"]67@app.route("/webhooks/paperoffice", methods=["POST"])8def paperoffice_webhook():9    signature  = request.headers.get("X-PaperOffice-Signature", "")10    event_id   = request.headers.get("X-PaperOffice-Event-ID", "")11    event_type = request.headers.get("X-PaperOffice-Event", "")1213    expected = "sha256=" + hmac.new(14        WEBHOOK_SECRET.encode(),15        request.get_data(),16        hashlib.sha256,17    ).hexdigest()1819    if not hmac.compare_digest(signature, expected):20        abort(401)2122    payload = request.get_json()23    # store event_id as idempotency key in your DB24    print(event_type, payload["data"])25    return "ok", 200

1<?php2// PaperOffice webhook receiver with HMAC-SHA256 signature verification3$secret = getenv('PAPEROFFICE_WEBHOOK_SECRET');4$raw    = file_get_contents('php://input');56$signature  = $_SERVER['HTTP_X_PAPEROFFICE_SIGNATURE'] ?? '';7$event_id   = $_SERVER['HTTP_X_PAPEROFFICE_EVENT_ID'] ?? '';8$event_type = $_SERVER['HTTP_X_PAPEROFFICE_EVENT'] ?? '';910$expected = 'sha256=' . hash_hmac('sha256', $raw, $secret);11if (!hash_equals($expected, $signature)) {12    http_response_code(401);13    exit('invalid signature');14}1516$event = json_decode($raw, true);17// store event_id as idempotency key in your DB18error_log("{$event_type}: " . json_encode($event['data']));19http_response_code(200);20echo 'ok';