63 lines
2.0 KiB
TypeScript
63 lines
2.0 KiB
TypeScript
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import * as functions from 'firebase-functions'
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import { applyEntitlementEvent, EntitlementEvent } from './entitlementLogic'
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/**
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* RevenueCat webhook handler.
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*
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* Path: POST /revenueCatWebhook (registered as an HTTPS function)
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* Triggered by RevenueCat server-to-server events.
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*
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* Security:
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* - Real signature verification is intentionally a placeholder. Add Ed25519
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* signature verification using process.env.REVENUECAT_SIGNING_KEY before
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* shipping to production.
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* - The function immediately acknowledges valid-looking events so RevenueCat
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* does not retry; downstream failures are logged and should be monitored.
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*
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* Processing:
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* - Parses the RevenueCat event payload.
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* - Writes entitlement state to Firestore at users/{userId}/entitlements.
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* - Handles TRANSFER, RENEWAL, CANCELLATION, EXPIRATION, and BILLING_ISSUE.
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*/
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export const revenueCatWebhook = functions.https.onRequest(async (req, res) => {
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// Only accept POST requests.
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if (req.method !== 'POST') {
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res.status(405).json({ error: 'method_not_allowed' })
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return
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}
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// TODO: verify RevenueCat webhook signature / secret before trusting payload.
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// Placeholder verification returns true for now.
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const verified = verifyRevenueCatWebhook(req)
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if (!verified) {
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res.status(401).json({ error: 'unauthorized' })
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return
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}
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const event = req.body?.event as EntitlementEvent | undefined
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if (!event || !event.type || !event.app_user_id) {
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res.status(400).json({ error: 'malformed_payload' })
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return
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}
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// Acknowledge immediately to avoid RevenueCat retries.
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res.status(200).json({ received: true })
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try {
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await applyEntitlementEvent(event)
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} catch (err) {
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console.error('[revenueCatWebhook] entitlement sync failed:', err)
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}
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})
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/**
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* Placeholder webhook verification.
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* Replace with real Ed25519 signature verification before production.
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*/
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function verifyRevenueCatWebhook(
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// eslint-disable-next-line @typescript-eslint/no-unused-vars
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_req: functions.https.Request
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): boolean {
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return true
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}
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