nip69 server

proto/autogenerated/client.md

@@ -652,6 +652,7 @@ The nostr server will send back a message response, and inside the body there wi
   - __identifier__: _string_
   - __info__: _[UserInfo](#UserInfo)_
   - __max_withdrawable__: _number_
+  - __noffer__: _string_
 
 ### Application
   - __balance__: _number_
@@ -897,6 +898,7 @@ The nostr server will send back a message response, and inside the body there wi
 ### Product
   - __id__: _string_
   - __name__: _string_
+  - __noffer__: _string_
   - __price_sats__: _number_
 
 ### RelaysMigration

proto/autogenerated/ts/types.ts

@@ -510,6 +510,7 @@ export type AppUser = {
     identifier: string
     info: UserInfo
     max_withdrawable: number
+    noffer: string
 }
 export const AppUserOptionalFields: [] = []
 export type AppUserOptions = OptionsBaseMessage & {
@@ -517,6 +518,7 @@ export type AppUserOptions = OptionsBaseMessage & {
     identifier_CustomCheck?: (v: string) => boolean
     info_Options?: UserInfoOptions
     max_withdrawable_CustomCheck?: (v: number) => boolean
+    noffer_CustomCheck?: (v: string) => boolean
 }
 export const AppUserValidate = (o?: AppUser, opts: AppUserOptions = {}, path: string = 'AppUser::root.'): Error | null => {
     if (opts.checkOptionalsAreSet && opts.allOptionalsAreSet) return new Error(path + ': only one of checkOptionalsAreSet or allOptionalNonDefault can be set for each message')
@@ -532,6 +534,9 @@ export const AppUserValidate = (o?: AppUser, opts: AppUserOptions = {}, path: st
     if (typeof o.max_withdrawable !== 'number') return new Error(`${path}.max_withdrawable: is not a number`)
     if (opts.max_withdrawable_CustomCheck && !opts.max_withdrawable_CustomCheck(o.max_withdrawable)) return new Error(`${path}.max_withdrawable: custom check failed`)
 
+    if (typeof o.noffer !== 'string') return new Error(`${path}.noffer: is not a string`)
+    if (opts.noffer_CustomCheck && !opts.noffer_CustomCheck(o.noffer)) return new Error(`${path}.noffer: custom check failed`)
+
     return null
 }
 
@@ -1977,6 +1982,7 @@ export const PaymentStateValidate = (o?: PaymentState, opts: PaymentStateOptions
 export type Product = {
     id: string
     name: string
+    noffer: string
     price_sats: number
 }
 export const ProductOptionalFields: [] = []
@@ -1984,6 +1990,7 @@ export type ProductOptions = OptionsBaseMessage & {
     checkOptionalsAreSet?: []
     id_CustomCheck?: (v: string) => boolean
     name_CustomCheck?: (v: string) => boolean
+    noffer_CustomCheck?: (v: string) => boolean
     price_sats_CustomCheck?: (v: number) => boolean
 }
 export const ProductValidate = (o?: Product, opts: ProductOptions = {}, path: string = 'Product::root.'): Error | null => {
@@ -1996,6 +2003,9 @@ export const ProductValidate = (o?: Product, opts: ProductOptions = {}, path: st
     if (typeof o.name !== 'string') return new Error(`${path}.name: is not a string`)
     if (opts.name_CustomCheck && !opts.name_CustomCheck(o.name)) return new Error(`${path}.name: custom check failed`)
 
+    if (typeof o.noffer !== 'string') return new Error(`${path}.noffer: is not a string`)
+    if (opts.noffer_CustomCheck && !opts.noffer_CustomCheck(o.noffer)) return new Error(`${path}.noffer: custom check failed`)
+
     if (typeof o.price_sats !== 'number') return new Error(`${path}.price_sats: is not a number`)
     if (opts.price_sats_CustomCheck && !opts.price_sats_CustomCheck(o.price_sats)) return new Error(`${path}.price_sats: custom check failed`)
 

proto/service/structs.proto

@@ -192,6 +192,7 @@ message AppUser {
     string identifier = 1;
     UserInfo info = 2;
     int64 max_withdrawable = 3;
+    string noffer = 4;
 }
 
 message AddAppInvoiceRequest {
@@ -409,6 +410,7 @@ message Product {
     string id = 1;
     string name = 2;
     int64 price_sats = 3;
+    string noffer = 4;
 }
 
 message GetProductBuyLinkResponse {

src/custom-nip19.ts

@@ -6,6 +6,7 @@
 */
 import { bytesToHex, concatBytes, hexToBytes } from '@noble/hashes/utils';
 import { bech32 } from 'bech32';
+import { LoadNosrtSettingsFromEnv } from './services/nostr/index.js';
 
 export const utf8Decoder = new TextDecoder('utf-8')
 export const utf8Encoder = new TextEncoder()
@@ -17,6 +18,12 @@ export type CustomProfilePointer = {
   bridge?: string[] // one bridge
 }
 
+export type OfferPointer = {
+  pubkey: string,
+  relays?: string[],
+  offer: string
+}
+
 
 
 type TLV = { [t: number]: Uint8Array[] }
@@ -54,6 +61,21 @@ export const encodeNprofile = (profile: CustomProfilePointer): string => {
   return bech32.encode("nprofile", words, 5000);
 }
 
+export const encodeNoffer = (offer: OfferPointer): string => {
+  let relays = offer.relays
+  if (!relays) {
+    const settings = LoadNosrtSettingsFromEnv()
+    relays = settings.relays
+  }
+  const data = encodeTLV({
+    0: [hexToBytes(offer.pubkey)],
+    1: (relays).map(url => utf8Encoder.encode(url)),
+    2: [hexToBytes(offer.offer)]
+  });
+  const words = bech32.toWords(data)
+  return bech32.encode("nprofile", words, 5000);
+}
+
 const parseTLV = (data: Uint8Array): TLV => {
   const result: TLV = {}
   let rest = data

src/nostrMiddleware.ts

@@ -1,9 +1,12 @@
 import Main from "./services/main/index.js"
 import Nostr from "./services/nostr/index.js"
-import { NostrSend, NostrSettings } from "./services/nostr/handler.js"
+import { NostrEvent, NostrSend, NostrSettings } from "./services/nostr/handler.js"
 import * as Types from '../proto/autogenerated/ts/types.js'
 import NewNostrTransport, { NostrRequest } from '../proto/autogenerated/ts/nostr_transport.js';
 import { ERROR, getLogger } from "./services/helpers/logger.js";
+import { UnsignedEvent } from "./services/nostr/tools/event.js";
+import { defaultInvoiceExpiry } from "./services/storage/paymentStorage.js";
+import { Application } from "./services/storage/entity/Application.js";
 
 export default (serverMethods: Types.ServerMethods, mainHandler: Main, nostrSettings: NostrSettings, onClientEvent: (e: { requestId: string }, fromPub: string) => void): { Stop: () => void, Send: NostrSend } => {
     const log = getLogger({})
@@ -45,6 +48,12 @@ export default (serverMethods: Types.ServerMethods, mainHandler: Main, nostrSett
             log(ERROR, "invalid json event received", event.content)
             return
         }
+        if (event.kind === 21001) {
+            const offerReq = j as { offer: string }
+            handleNofferEvent(mainHandler, offerReq, event)
+                .then(e => nostr.Send({ type: 'app', appId: event.appId }, { type: 'event', event: e, encrypt: { toPub: event.pub } }))
+            return
+        }
         if (!j.rpcName) {
             onClientEvent(j as { requestId: string }, event.pub)
             return
@@ -59,3 +68,41 @@ export default (serverMethods: Types.ServerMethods, mainHandler: Main, nostrSett
     })
     return { Stop: () => nostr.Stop, Send: (...args) => nostr.Send(...args) }
 }
+
+// TODO: move this to paymentManager
+const handleNofferEvent = async (mainHandler: Main, offerReq: { offer: string }, event: NostrEvent): Promise<UnsignedEvent> => {
+    const app = await mainHandler.storage.applicationStorage.GetApplication(event.appId)
+    try {
+        const offer = offerReq.offer
+        let invoice: string
+        const split = offer.split(':')
+        if (split.length === 1) {
+            const user = await mainHandler.storage.applicationStorage.GetApplicationUser(app, split[0])
+            //TODO: add prop def for amount
+            const userInvoice = await mainHandler.paymentManager.NewInvoice(user.user.user_id, { amountSats: 1000, memo: "free offer" }, { expiry: defaultInvoiceExpiry, linkedApplication: app })
+            invoice = userInvoice.invoice
+        } else if (split[0] === 'p') {
+            const product = await mainHandler.productManager.NewProductInvoice(split[1])
+            invoice = product.invoice
+        } else {
+            return newNofferResponse(JSON.stringify({ code: 1, message: 'Invalid Offer' }), app, event)
+        }
+        return newNofferResponse(JSON.stringify({ bolt11: invoice }), app, event)
+    } catch (e: any) {
+        getLogger({ component: "noffer" })(ERROR, e.message || e)
+        return newNofferResponse(JSON.stringify({ code: 1, message: 'Invalid Offer' }), app, event)
+    }
+}
+
+const newNofferResponse = (content: string, app: Application, event: NostrEvent): UnsignedEvent => {
+    return {
+        content,
+        created_at: Math.floor(Date.now() / 1000),
+        kind: 21001,
+        pubkey: app.nostr_public_key!,
+        tags: [
+            ['p', event.pub],
+            ['e', event.id],
+        ],
+    }
+}

src/services/main/applicationManager.ts

@@ -8,6 +8,7 @@ import { ApplicationUser } from '../storage/entity/ApplicationUser.js'
 import { PubLogger, getLogger } from '../helpers/logger.js'
 import crypto from 'crypto'
 import { Application } from '../storage/entity/Application.js'
+import { encodeNoffer } from '../../custom-nip19.js'
 
 const TOKEN_EXPIRY_TIME = 2 * 60 * 1000 // 2 minutes, in milliseconds
 
@@ -160,6 +161,7 @@ export default class {
                 service_fee_bps: this.settings.outgoingAppUserInvoiceFeeBps
 
             },
+            noffer: encodeNoffer({ pubkey: app.nostr_public_key!, offer: u.identifier }),
             max_withdrawable: this.paymentManager.GetMaxPayableInvoice(u.user.balance_sats, true)
         }
     }
@@ -197,7 +199,7 @@ export default class {
                 network_max_fee_bps: this.settings.lndSettings.feeRateBps,
                 network_max_fee_fixed: this.settings.lndSettings.feeFixedLimit,
                 service_fee_bps: this.settings.outgoingAppUserInvoiceFeeBps
-            }
+            }, noffer: encodeNoffer({ pubkey: app.nostr_public_key!, offer: user.identifier })
         }
     }
 

src/services/main/productManager.ts

@@ -5,6 +5,7 @@ import * as Types from '../../../proto/autogenerated/ts/types.js'
 import { MainSettings } from './settings.js'
 import PaymentManager from './paymentManager.js'
 import { defaultInvoiceExpiry } from '../storage/paymentStorage.js'
+import { encodeNoffer } from '../../custom-nip19.js'
 
 export default class {
     storage: Storage
@@ -20,10 +21,12 @@ export default class {
     async AddProduct(userId: string, req: Types.AddProductRequest): Promise<Types.Product> {
         const user = await this.storage.userStorage.GetUser(userId)
         const newProduct = await this.storage.productStorage.AddProduct(req.name, req.price_sats, user)
+        const offer = `p:${newProduct.product_id}`
         return {
             id: newProduct.product_id,
             name: newProduct.name,
             price_sats: newProduct.price_sats,
+            noffer: encodeNoffer({ pubkey: user.user_id, offer: offer })
         }
     }
 

src/services/nostr/handler.ts

@@ -6,7 +6,7 @@ import { encodeNprofile } from '../../custom-nip19.js'
 const handledEvents: string[] = [] // TODO: - big memory leak here, add TTL
 type AppInfo = { appId: string, publicKey: string, privateKey: string, name: string }
 type ClientInfo = { clientId: string, publicKey: string, privateKey: string, name: string }
-export type SendData = { type: "content", content: string, pub: string } | { type: "event", event: UnsignedEvent }
+export type SendData = { type: "content", content: string, pub: string } | { type: "event", event: UnsignedEvent, encrypt?: { toPub: string } }
 export type SendInitiator = { type: 'app', appId: string } | { type: 'client', clientId: string }
 export type NostrSend = (initiator: SendInitiator, data: SendData, relays?: string[] | undefined) => void
 
@@ -22,6 +22,7 @@ export type NostrEvent = {
     appId: string
     startAtNano: string
     startAtMs: number
+    kind: number
 }
 
 type SettingsRequest = {
@@ -89,7 +90,7 @@ const sendToNostr: NostrSend = (initiator, data, relays) => {
     subProcessHandler.Send(initiator, data, relays)
 }
 send({ type: 'ready' })
-
+const supportedKinds = [21000, 21001]
 export default class Handler {
     pool = new SimplePool()
     settings: NostrSettings
@@ -132,7 +133,7 @@ export default class Handler {
         const sub = relay.sub([
             {
                 since: Math.ceil(Date.now() / 1000),
-                kinds: [21000],
+                kinds: supportedKinds,
                 '#p': Object.keys(this.apps),
             }
         ])
@@ -140,7 +141,7 @@ export default class Handler {
             log("up to date with nostr events")
         })
         sub.on('event', async (e) => {
-            if (e.kind !== 21000 || !e.pubkey) {
+            if (!supportedKinds.includes(e.kind) || !e.pubkey) {
                 return
             }
             const pubTags = e.tags.find(tags => tags && tags.length > 1 && tags[0] === 'p')
@@ -155,7 +156,7 @@ export default class Handler {
         })
     }
 
-    async processEvent(e: Event<21000>, app: AppInfo) {
+    async processEvent(e: Event, app: AppInfo) {
         const eventId = e.id
         if (handledEvents.includes(eventId)) {
             this.log("event already handled")
@@ -166,7 +167,7 @@ export default class Handler {
         const startAtNano = process.hrtime.bigint().toString()
         const decoded = decodePayload(e.content)
         const content = await decryptData(decoded, getSharedSecret(app.privateKey, e.pubkey))
-        this.eventCallback({ id: eventId, content, pub: e.pubkey, appId: app.appId, startAtNano, startAtMs })
+        this.eventCallback({ id: eventId, content, pub: e.pubkey, appId: app.appId, startAtNano, startAtMs, kind: e.kind })
     }
 
     async Send(initiator: SendInitiator, data: SendData, relays?: string[]) {
@@ -184,6 +185,10 @@ export default class Handler {
             }
         } else {
             toSign = data.event
+            if (data.encrypt) {
+                const content = await encryptData(data.event.content, getSharedSecret(keys.privateKey, data.encrypt.toPub))
+                toSign.content = encodePayload(content)
+            }
         }
 
         const signed = finishEvent(toSign, keys.privateKey)