Fix preimage undefined in wallet logs (#1337)

* Fix preimage undefined in NWC wallet logs

* Return preimage as string

wallets/README.md

@@ -163,11 +163,11 @@ This function must throw an error if the configuration was found to be invalid.
 
 The `context` argument is an object. It makes the wallet logger for this wallet as returned by `useWalletLogger` available under `context.logger`. See [components/wallet-logger.js](../components/wallet-logger.js).
 
-- `sendPayment: async (bolt11: string, config, context) => Promise<{ preimage: string }>`
+- `sendPayment: async (bolt11: string, config, context) => Promise<string>`
 
 `sendPayment` will be called if a payment is required. Therefore, this function should implement the code to pay invoices from this wallet.
 
-The first argument is the [BOLT11 payment request](https://github.com/lightning/bolts/blob/master/11-payment-encoding.md). The `config` argument is the current configuration of this wallet (that was validated before). The `context` argument is the same as for `testSendPayment`.
+The first argument is the [BOLT11 payment request](https://github.com/lightning/bolts/blob/master/11-payment-encoding.md). The `config` argument is the current configuration of this wallet (that was validated before). The `context` argument is the same as for `testSendPayment`. The function should return the preimage on payment success.
 
 > [!IMPORTANT]
 > As mentioned above, this file must exist for every wallet and at least reexport everything in index.js so make sure that the following line is included:

wallets/blink/client.js

@@ -10,8 +10,7 @@ export async function testSendPayment ({ apiKey, currency }, { logger }) {
 
 export async function sendPayment (bolt11, { apiKey, currency }) {
   const wallet = await getWallet(apiKey, currency)
-  const preImage = await payInvoice(apiKey, wallet, bolt11)
-  return { preImage }
+  return await payInvoice(apiKey, wallet, bolt11)
 }
 
 async function payInvoice (authToken, wallet, invoice) {

wallets/index.js

@@ -59,7 +59,7 @@ export function useWallet (name) {
     const hash = bolt11Tags(bolt11).payment_hash
     logger.info('sending payment:', `payment_hash=${hash}`)
     try {
-      const { preimage } = await wallet.sendPayment(bolt11, config, { me, logger, status, showModal })
+      const preimage = await wallet.sendPayment(bolt11, config, { me, logger, status, showModal })
       logger.ok('payment successful:', `payment_hash=${hash}`, `preimage=${preimage}`)
     } catch (err) {
       const message = err.message || err.toString?.()

wallets/lnbits/client.js

@@ -19,8 +19,7 @@ export async function sendPayment (bolt11, { url, adminKey }) {
     throw new Error('No preimage')
   }
 
-  const preimage = checkResponse.preimage
-  return { preimage }
+  return checkResponse.preimage
 }
 
 async function getWallet ({ url, adminKey, invoiceKey }) {

wallets/lnc/client.js

@@ -67,7 +67,7 @@ export async function sendPayment (bolt11, credentials, { logger }) {
       if (paymentError) throw new Error(paymentError)
       if (!preimage) throw new Error('No preimage in response')
 
-      return { preimage }
+      return preimage
     } catch (err) {
       const msg = err.message || err.toString?.()
       if (msg.includes('invoice expired')) {

wallets/phoenixd/client.js

@@ -35,5 +35,5 @@ export async function sendPayment (bolt11, { url, primaryPassword }) {
     throw new Error(payment.reason)
   }
 
-  return payment.paymentPreimage
+  return preimage
 }