From 13ecf8bf8b85d857c8c087dba527af45cbf353da Mon Sep 17 00:00:00 2001
From: Nicolas Burtey <nb@galoy.io>
Date: Tue, 22 Aug 2023 12:39:48 +0100
Subject: [PATCH] chore: make it possible to pass an amount for initial request

---
 README.md                      |  1 +
 app/lnurlp/[username]/route.ts | 26 ++++++++++++++++++--------
 hooks/use-Create-Invoice.tsx   |  2 --
 3 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/README.md b/README.md
index 8c338714..a83044dc 100644
--- a/README.md
+++ b/README.md
@@ -77,3 +77,4 @@ This will build the app for production under a `build` folder. It will bundle Re
 This environment variable is needed for getting the lnurlp endpoint working.
 
 curl localhost:3000/.well-known/lnurlp/alice
+curl localhost:3000/.well-known/lnurlp/alice?amount=1234
diff --git a/app/lnurlp/[username]/route.ts b/app/lnurlp/[username]/route.ts
index 5b32c773..5dbefe86 100644
--- a/app/lnurlp/[username]/route.ts
+++ b/app/lnurlp/[username]/route.ts
@@ -9,7 +9,7 @@ import {
   InMemoryCache,
 } from "@apollo/client"
 
-import { GRAPHQL_URL_INTERNAL, NOSTR_PUBKEY } from "../../../lib/config"
+import { GRAPHQL_URL, GRAPHQL_URL_INTERNAL, NOSTR_PUBKEY } from "../../../lib/config"
 import {
   AccountDefaultWalletDocument,
   AccountDefaultWalletQuery,
@@ -78,16 +78,18 @@ export async function GET(
 ) {
   console.log(NOSTR_PUBKEY)
 
+  const { searchParams } = new URL(request.url)
+
   const username = params.username
 
-  const accountUsername = username ? username.toString() : ""
+  const amount = searchParams.get("amount")
 
   let walletId: string | null = null
 
   try {
     const { data } = await client.query<AccountDefaultWalletQuery>({
       query: AccountDefaultWalletDocument,
-      variables: { username: accountUsername, walletCurrency: "BTC" },
+      variables: { username, walletCurrency: "BTC" },
       context: {
         "x-real-ip": request.headers.get("x-real-ip"),
         "x-forwarded-for": request.headers.get("x-forwarded-for"),
@@ -106,17 +108,25 @@ export async function GET(
   }
 
   const metadata = JSON.stringify([
-    ["text/plain", `Payment to ${accountUsername}`],
-    ["text/identifier", `${accountUsername}@${URL_HOST_DOMAIN}`],
+    ["text/plain", `Payment to ${username}`],
+    ["text/identifier", `${username}@${URL_HOST_DOMAIN}`],
   ])
 
-  const payServer = GRAPHQL_URI.replace("/graphql", "").replace("api", "pay")
+  const payServer = GRAPHQL_URL.replace("/graphql", "").replace("api", "pay")
   const callback = `${payServer}/.well-known/${username}/lnurlp/callback`
 
+  let minSendable = 1000 // 1 sat in millisat
+  let maxSendable = 100000000000 // 1 BTC in millisat
+
+  if (amount && Number.isInteger(Number(amount))) {
+    minSendable = Number(amount) * 1000
+    maxSendable = Number(amount) * 1000
+  }
+
   return NextResponse.json({
     callback,
-    minSendable: 1000,
-    maxSendable: 100000000000,
+    minSendable,
+    maxSendable,
     metadata,
     tag: "payRequest",
     ...(nostrEnabled
diff --git a/hooks/use-Create-Invoice.tsx b/hooks/use-Create-Invoice.tsx
index f36055ad..9daae169 100644
--- a/hooks/use-Create-Invoice.tsx
+++ b/hooks/use-Create-Invoice.tsx
@@ -29,9 +29,7 @@ gql`
       __typename
     }
   }
-`
 
-gql`
   mutation lnInvoiceCreateOnBehalfOfRecipients(
     $input: LnInvoiceCreateOnBehalfOfRecipientInput!
   ) {