From 6743f7e3c6240e82c5c71f6fd85fd2a45b9722b5 Mon Sep 17 00:00:00 2001
From: callebtc <93376500+callebtc@users.noreply.github.com>
Date: Fri, 16 Aug 2024 15:45:17 +0200
Subject: [PATCH] Fix lnurl qr decode (#221)

* fix lnurl qr decode

* remove comments
---
 src/components/PayInvoiceDialog.vue |  5 ++--
 src/stores/wallet.ts                | 37 ++++++++++++++++++++---------
 2 files changed, 29 insertions(+), 13 deletions(-)

diff --git a/src/components/PayInvoiceDialog.vue b/src/components/PayInvoiceDialog.vue
index da5c37c0..87fbbb1d 100644
--- a/src/components/PayInvoiceDialog.vue
+++ b/src/components/PayInvoiceDialog.vue
@@ -79,13 +79,14 @@
             "
             class="q-my-none text-h6 text-center"
           >
-            <b>{{ payInvoiceData.domain }}</b> is requesting
+            <b>{{ payInvoiceData.lnurlpay.domain }}</b> is requesting
             {{ payInvoiceData.lnurlpay.maxSendable / 1000 }}
             {{ tickerShort }}
           </p>
           <p v-else class="q-my-none text-h6 text-center">
             <b>{{
-              payInvoiceData.lnurlpay.targetUser || payInvoiceData.domain
+              payInvoiceData.lnurlpay.targetUser ||
+              payInvoiceData.lnurlpay.domain
             }}</b>
             is requesting <br />
             between
diff --git a/src/stores/wallet.ts b/src/stores/wallet.ts
index f41b1b04..aa302b7f 100644
--- a/src/stores/wallet.ts
+++ b/src/stores/wallet.ts
@@ -15,7 +15,7 @@ import { notifyApiError, notifyError, notifySuccess, notifyWarning, notify } fro
 import { CashuMint, CashuWallet, Proof, MintQuotePayload, CheckStatePayload, MeltQuotePayload, MeltQuoteResponse, generateNewMnemonic, deriveSeedFromMnemonic, AmountPreference, CheckStateEnum } from "@cashu/cashu-ts";
 import { hashToCurve } from "@cashu/cashu-ts/dist/lib/es6/DHKE";
 import * as bolt11Decoder from "light-bolt11-decoder";
-import bech32 from "bech32";
+import { bech32 } from "bech32";
 import axios from "axios";
 import { date } from "quasar";
 import { splitAmount } from "@cashu/cashu-ts/dist/lib/es5/utils";
@@ -82,7 +82,7 @@ export const useWalletStore = defineStore("wallet", {
           sat: 0,
           memo: "",
           bolt11: "",
-        },
+        } as { sat: number, memo: string, bolt11: string } | null,
         lnurlpay: {
           domain: "",
           callback: "",
@@ -96,10 +96,10 @@ export const useWalletStore = defineStore("wallet", {
         lnurlauth: {},
         input: {
           request: "",
-          amount: 0,
+          amount: null,
           comment: "",
           quote: "",
-        },
+        } as { request: string, amount: number | null, comment: string, quote: string },
       },
     };
   },
@@ -1019,7 +1019,7 @@ export const useWalletStore = defineStore("wallet", {
         req.toLowerCase().startsWith("lnurl1") ||
         req.match(/[\w.+-~_]+@[\w.+-~_]/)
       ) {
-        this.payInvoiceData.input.request = req;
+        this.payInvoiceData.input.request = req
         await this.lnurlPayFirst(this.payInvoiceData.input.request);
       } else if (req.indexOf("cashuA") !== -1) {
         // very dirty way of parsing cashu tokens from either a pasted token or a URL like https://host.com?token=eyJwcm
@@ -1042,16 +1042,20 @@ export const useWalletStore = defineStore("wallet", {
     },
     lnurlPayFirst: async function (address: string) {
       var host;
+      var data
       if (address.split("@").length == 2) {
         let [user, lnaddresshost] = address.split("@");
         host = `https://${lnaddresshost}/.well-known/lnurlp/${user}`;
-        var { data } = await axios.get(host); // Moved it here: we don't want 2 potential calls
+        const resp = await axios.get(host); // Moved it here: we don't want 2 potential calls
+        data = resp.data;
       } else if (address.toLowerCase().slice(0, 6) === "lnurl1") {
-        let host = Buffer.from(
-          bech32.fromWords(bech32.decode(address, 20000).words)
-        ).toString();
-        var { data } = await axios.get(host);
-        host = data.domain;
+        let decoded = bech32.decode(address, 20000);
+        const words = bech32.fromWords(decoded.words);
+        const uint8Array = new Uint8Array(words);
+        host = new TextDecoder().decode(uint8Array);
+
+        const resp = await axios.get(host);
+        data = resp.data;
       }
       if (host == undefined) {
         notifyError("Invalid LNURL", "LNURL Error");
@@ -1067,12 +1071,23 @@ export const useWalletStore = defineStore("wallet", {
           this.payInvoiceData.input.amount =
             this.payInvoiceData.lnurlpay.maxSendable / 1000;
         }
+        this.payInvoiceData.invoice = null;
+        this.payInvoiceData.input = {
+          request: "",
+          amount: null,
+          comment: "",
+          quote: "",
+        };
         this.payInvoiceData.show = true;
       }
     },
     lnurlPaySecond: async function () {
       const mintStore = useMintsStore();
       let amount = this.payInvoiceData.input.amount;
+      if (amount == null) {
+        notifyError("No amount", "LNURL Error");
+        return;
+      }
       if (this.payInvoiceData.lnurlpay == null) {
         notifyError("No LNURL data", "LNURL Error");
         return;