feat: add LNURL processor (#202)

* feat: add new lnurl processor

* fix: lnbits issues

* fix: add default settings for lnurl processor

* fix: small changes

* fix: more changes

* fix: add verify url in upsert omit

* fix: change comment

* chore: add updateInvoiceStatus

* chore: revert lnbits change

* fix: changes

migrations/20230213103904_add_verify_url_to_invoices_table.js

@@ -0,0 +1,9 @@
+exports.up = function (knex) {
+  return knex.raw('ALTER TABLE invoices ADD verify_url TEXT;')
+}
+
+exports.down = function (knex) {
+  return knex.schema.alterTable('invoices', function (table) {
+    table.dropColumn('verify_url')
+  })
+}

resources/default-settings.yaml

@@ -28,6 +28,8 @@ paymentsProcessors:
   lnbits:
     baseURL: https://lnbits.your-domain.com/
     callbackBaseURL: https://nostream.your-domain.com/callbacks/lnbits
+  lnurl:
+    invoiceURL: https://getalby.com/lnurlp/your-username
 network:
   maxPayloadSize: 524288
   # Comment the next line if using CloudFlare proxy

resources/invoices.html

@@ -168,7 +168,7 @@ <h2 class="text-danger">Invoice expired!</h2>
               if (event.pubkey === relayPubkey) {
                 paid = true
 
-                clearTimeout(timeout)
+                if (expiresAt) clearTimeout(timeout)
 
                 hide('pending')
                 show('paid')
@@ -213,12 +213,14 @@ <h2 class="text-danger">Invoice expired!</h2>
         }
       }
 
-      const expiry = (new Date(expiresAt).getTime() - new Date().getTime())
-      console.log('expiry at', expiresAt, Math.floor(expiry / 1000))
-      timeout = setTimeout(() => {
-        hide('pending')
-        show('expired')
-      }, expiry)
+      if (expiresAt) {
+        const expiry = (new Date(expiresAt).getTime() - new Date().getTime())
+        console.log('expiry at', expiresAt, Math.floor(expiry / 1000))
+        timeout = setTimeout(() => {
+          hide('pending')
+          show('expired')
+        }, expiry)
+      }
 
       new QRCode(document.getElementById("invoice"), {
         text: `lightning:${invoice}`,

src/@types/clients.ts

@@ -12,6 +12,7 @@ export interface CreateInvoiceResponse {
   confirmedAt?: Date | null
   createdAt: Date
   rawResponse?: string
+  verifyURL?: string
 }
 
 export interface CreateInvoiceRequest {
@@ -20,9 +21,9 @@ export interface CreateInvoiceRequest {
   requestId?: string
 }
 
-export type GetInvoiceResponse = Invoice
+export type GetInvoiceResponse = Partial<Invoice>
 
 export interface IPaymentsProcessor {
   createInvoice(request: CreateInvoiceRequest): Promise<CreateInvoiceResponse>
-  getInvoice(invoiceId: string): Promise<GetInvoiceResponse>
+  getInvoice(invoice: string | Invoice): Promise<GetInvoiceResponse>
 }

src/@types/invoice.ts

@@ -24,6 +24,7 @@ export interface Invoice {
   expiresAt: Date | null
   updatedAt: Date
   createdAt: Date
+  verifyURL?: string
 }
 
 export interface DBInvoice {
@@ -39,4 +40,5 @@ export interface DBInvoice {
   expires_at: Date
   updated_at: Date
   created_at: Date
+  verify_url: string
 }

src/@types/services.ts

@@ -2,13 +2,14 @@ import { Invoice } from './invoice'
 import { Pubkey } from './base'
 
 export interface IPaymentsService {
-  getInvoiceFromPaymentsProcessor(invoiceId: string): Promise<Invoice>
+  getInvoiceFromPaymentsProcessor(invoice: string | Invoice): Promise<Partial<Invoice>>
   createInvoice(
     pubkey: Pubkey,
     amount: bigint,
     description: string,
   ): Promise<Invoice>
-  updateInvoice(invoice: Invoice): Promise<void>
+  updateInvoice(invoice: Partial<Invoice>): Promise<void>
+  updateInvoiceStatus(invoice: Partial<Invoice>): Promise<void>
   confirmInvoice(
     invoice: Pick<Invoice, 'id' | 'amountPaid' | 'confirmedAt'>,
   ): Promise<void>

src/@types/settings.ts

@@ -142,6 +142,10 @@ export interface Payments {
   feeSchedules: FeeSchedules
 }
 
+export interface LnurlPaymentsProcessor {
+  invoiceURL: string
+}
+
 export interface ZebedeePaymentsProcessor {
   baseURL: string
   callbackBaseURL: string
@@ -154,6 +158,7 @@ export interface LNbitsPaymentProcessor {
 }
 
 export interface PaymentsProcessors {
+  lnurl?: LnurlPaymentsProcessor,
   zebedee?: ZebedeePaymentsProcessor
   lnbits?: LNbitsPaymentProcessor
 }

src/app/maintenance-worker.ts

@@ -48,10 +48,10 @@ export class MaintenanceWorker implements IRunnable {
       debug('invoice %s: %o', invoice.id, invoice)
       try {
         debug('getting invoice %s from payment processor', invoice.id)
-        const updatedInvoice = await this.paymentsService.getInvoiceFromPaymentsProcessor(invoice.id)
+        const updatedInvoice = await this.paymentsService.getInvoiceFromPaymentsProcessor(invoice)
         await delay()
-        debug('updating invoice %s: %o', invoice.id, invoice)
-        await this.paymentsService.updateInvoice(updatedInvoice)
+        debug('updating invoice status %s: %o', invoice.id, invoice)
+        await this.paymentsService.updateInvoiceStatus(updatedInvoice)
 
         if (
           invoice.status !== updatedInvoice.status

src/constants/base.ts

@@ -40,6 +40,7 @@ export enum EventTags {
 }
 
 export enum PaymentsProcessors {
+  LNURL = 'lnurl',
   ZEBEDEE = 'zebedee',
   LNBITS = 'lnbits',
 }

src/controllers/callbacks/lnbits-callback-controller.ts

@@ -1,9 +1,9 @@
 import { Request, Response } from 'express'
 
+import { Invoice, InvoiceStatus } from '../../@types/invoice'
 import { createLogger } from '../../factories/logger-factory'
 import { IController } from '../../@types/controllers'
 import { IInvoiceRepository } from '../../@types/repositories'
-import { InvoiceStatus } from '../../@types/invoice'
 import { IPaymentsService } from '../../@types/services'
 
 const debug = createLogger('lnbits-callback-controller')
@@ -72,8 +72,8 @@ export class LNbitsCallbackController implements IController {
     invoice.amountPaid = invoice.amountRequested
 
     try {
-      await this.paymentsService.confirmInvoice(invoice)
-      await this.paymentsService.sendInvoiceUpdateNotification(invoice)
+      await this.paymentsService.confirmInvoice(invoice as Invoice)
+      await this.paymentsService.sendInvoiceUpdateNotification(invoice as Invoice)
     } catch (error) {
       console.error(`Unable to confirm invoice ${invoice.id}`, error)
 

src/controllers/invoices/post-invoice-controller.ts

@@ -165,7 +165,7 @@ export class PostInvoiceController implements IController {
       relay_url: relayUrl,
       pubkey,
       relay_pubkey: relayPubkey,
-      expires_at: invoice.expiresAt?.toISOString(),
+      expires_at: invoice.expiresAt?.toISOString() ?? '',
       invoice: invoice.bolt11,
       amount: amount / 1000n,
     }

src/factories/payments-processor-factory.ts

@@ -5,6 +5,7 @@ import { createLogger } from './logger-factory'
 import { createSettings } from './settings-factory'
 import { IPaymentsProcessor } from '../@types/clients'
 import { LNbitsPaymentsProcesor } from '../payments-processors/lnbits-payment-processor'
+import { LnurlPaymentsProcesor } from '../payments-processors/lnurl-payments-processor'
 import { NullPaymentsProcessor } from '../payments-processors/null-payments-processor'
 import { PaymentsProcessor } from '../payments-processors/payments-procesor'
 import { Settings } from '../@types/settings'
@@ -44,6 +45,19 @@ const getLNbitsAxiosConfig = (settings: Settings): CreateAxiosDefaults<any> => {
   }
 }
 
+const createLnurlPaymentsProcessor = (settings: Settings): IPaymentsProcessor => {
+  const invoiceURL = path(['paymentsProcessors', 'lnurl', 'invoiceURL'], settings) as string | undefined
+  if (typeof invoiceURL === 'undefined') {
+    throw new Error('Unable to create payments processor: Setting paymentsProcessor.lnurl.invoiceURL is not configured.')
+  }
+
+  const client = axios.create()
+
+  const app = new LnurlPaymentsProcesor(client, createSettings)
+
+  return new PaymentsProcessor(app)
+}
+
 const createZebedeePaymentsProcessor = (settings: Settings): IPaymentsProcessor => {
   const callbackBaseURL = path(['paymentsProcessors', 'zebedee', 'callbackBaseURL'], settings) as string | undefined
   if (typeof callbackBaseURL === 'undefined' || callbackBaseURL.indexOf('nostream.your-domain.com') >= 0) {
@@ -98,6 +112,8 @@ export const createPaymentsProcessor = (): IPaymentsProcessor => {
   }
 
   switch (settings.payments?.processor) {
+    case 'lnurl':
+      return createLnurlPaymentsProcessor(settings)
     case 'zebedee':
       return createZebedeePaymentsProcessor(settings)
     case 'lnbits':

src/payments-processors/lnurl-payments-processor.ts

@@ -0,0 +1,69 @@
+import { AxiosInstance } from 'axios'
+import { Factory } from '../@types/base'
+
+import { CreateInvoiceRequest, GetInvoiceResponse, IPaymentsProcessor } from '../@types/clients'
+import { Invoice, InvoiceStatus, InvoiceUnit } from '../@types/invoice'
+import { createLogger } from '../factories/logger-factory'
+import { randomUUID } from 'crypto'
+import { Settings } from '../@types/settings'
+
+const debug = createLogger('lnurl-payments-processor')
+
+export class LnurlPaymentsProcesor implements IPaymentsProcessor {
+  public constructor(
+    private httpClient: AxiosInstance,
+    private settings: Factory<Settings>
+  ) {}
+
+  public async getInvoice(invoice: Invoice): Promise<GetInvoiceResponse> {
+    debug('get invoice: %s', invoice.id)
+
+    try {
+      const response = await this.httpClient.get(invoice.verifyURL)
+
+      return {
+        id: invoice.id,
+        status: response.data.settled ? InvoiceStatus['COMPLETED'] : InvoiceStatus['PENDING'],
+      }
+    } catch (error) {
+      console.error(`Unable to get invoice ${invoice.id}. Reason:`, error)
+
+      throw error
+    }
+  }
+
+  public async createInvoice(request: CreateInvoiceRequest): Promise<any> {
+    debug('create invoice: %o', request)
+    const {
+      amount: amountMsats,
+      description,
+      requestId,
+    } = request
+
+    try {
+      const response = await this.httpClient.get(`${this.settings().paymentsProcessors?.lnurl?.invoiceURL}/callback?amount=${amountMsats}&comment=${description}`)
+
+      const result = {
+        id: randomUUID(),
+        pubkey: requestId,
+        bolt11: response.data.pr,
+        amountRequested: amountMsats,
+        description,
+        unit: InvoiceUnit.MSATS,
+        status: InvoiceStatus.PENDING,
+        expiresAt: null,
+        confirmedAt: null,
+        createdAt: new Date(),
+        verifyURL: response.data.verify,
+      }
+
+      debug('result: %o', result)
+
+      return result
+    } catch (error) {
+      console.error('Unable to request invoice. Reason:', error.message)
+
+      throw error
+    }
+  }
+}

src/payments-processors/null-payments-processor.ts

@@ -16,6 +16,7 @@ export class NullPaymentsProcessor implements IPaymentsProcessor {
       confirmedAt: null,
       createdAt: date,
       updatedAt: date,
+      verifyURL: '',
     }
   }
 
@@ -32,6 +33,7 @@ export class NullPaymentsProcessor implements IPaymentsProcessor {
       rawResponse: '',
       confirmedAt: null,
       createdAt: new Date(),
+      verifyURL: '',
     }
   }
 }

src/payments-processors/payments-procesor.ts

@@ -1,13 +1,13 @@
-import { CreateInvoiceRequest, CreateInvoiceResponse, IPaymentsProcessor } from '../@types/clients'
+import { CreateInvoiceRequest, CreateInvoiceResponse, GetInvoiceResponse, IPaymentsProcessor } from '../@types/clients'
 import { Invoice } from '../@types/invoice'
 
 export class PaymentsProcessor implements IPaymentsProcessor {
   public constructor(
     private readonly processor: IPaymentsProcessor
   ) {}
 
-  public async getInvoice(invoiceId: string): Promise<Invoice> {
-    return this.processor.getInvoice(invoiceId)
+  public async getInvoice(invoice: string | Invoice): Promise<GetInvoiceResponse> {
+    return this.processor.getInvoice(invoice)
   }
 
   public async createInvoice(request: CreateInvoiceRequest): Promise<CreateInvoiceResponse> {

src/repositories/invoice-repository.ts

@@ -3,7 +3,6 @@ import {
   applySpec,
   ifElse,
   is,
-  isNil,
   omit,
   pipe,
   prop,
@@ -92,17 +91,10 @@ export class InvoiceRepository implements IInvoiceRepository {
       status: prop('status'),
       description: prop('description'),
       // confirmed_at: prop('confirmedAt'),
-      expires_at: ifElse(
-        propSatisfies(isNil, 'expiresAt'),
-        always(undefined),
-        prop('expiresAt'),
-      ),
+      expires_at: prop('expiresAt'),
       updated_at: always(new Date()),
-      created_at: ifElse(
-        propSatisfies(isNil, 'createdAt'),
-        always(undefined),
-        prop('createdAt'),
-      ),
+      created_at: prop('createdAt'),
+      verify_url: prop('verifyURL'),
     })(invoice)
 
     debug('row: %o', row)
@@ -120,6 +112,7 @@ export class InvoiceRepository implements IInvoiceRepository {
           'description',
           'expires_at',
           'created_at',
+          'verify_url',
         ])(row)
       )