Send google play public key during /purchase/can-do-purchase

src/function/purchase/index.ts

@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 Jonas Lochmann
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -17,5 +17,7 @@
 
 export { canDoNextPurchase } from './can-do-next-purchase'
 export { requireFamilyEntry } from './require-family-entry'
-export { isGooglePlayPurchaseSignatureValid, areGooglePlayPaymentsPossible } from './verification'
+export {
+  isGooglePlayPurchaseSignatureValid, areGooglePlayPaymentsPossible, googlePlayPublicKey
+} from './verification'
 export { addPurchase } from './add-purchase'

src/function/purchase/verification.ts

@@ -19,7 +19,7 @@ const IABVerifier: new (publicKey: string) => {
   verifyReceipt: (data: string, signature: string) => boolean
 } = require('iab_verifier')
 
-const googlePlayPublicKey = process.env.GOOGLE_PLAY_PUBLIC_KEY || ''
+export const googlePlayPublicKey = process.env.GOOGLE_PLAY_PUBLIC_KEY || ''
 
 const verifier = new IABVerifier(googlePlayPublicKey)