From 92ffc6e2e597867a55b592a20b16c233efad9cef Mon Sep 17 00:00:00 2001
From: Gyulai Zoltan <gyulainagyzoltan@gmail.com>
Date: Tue, 12 Oct 2021 13:53:33 +0300
Subject: feat: added lightning withdrawal with hardcoded fee estimation

---
 lib/send.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/send.js b/lib/send.js
index 293473d9..8edd1e58 100644
--- a/lib/send.js
+++ b/lib/send.js
@@ -1,7 +1,9 @@
 const bolt11 = require("bolt11");
 const { Op } = require("sequelize");
 
-send = async (amount, memo, hash, user) => {
+const ESTIMATED_FEE = 1000;
+
+send = async (amount, memo, hash, user, subtractFee = false) => {
   let payreq = bolt11.decode(hash);
   let routingInfo = payreq.tags.find(t => t.tagName === "routing_info");
   if (
@@ -12,6 +14,12 @@ send = async (amount, memo, hash, user) => {
 
   if (!amount || payreq.satoshis > amount) amount = payreq.satoshis;
 
+  if(subtractFee) {
+    amount -= ESTIMATED_FEE;
+    if(amount < 0)
+      throw new Error('Subtracted fee is greater than amount to send')
+  }
+
   if (seen.includes(hash)) {
     l.warn("attempted to pay a paid invoice", user.username);
     throw new Error("Invoice has been paid, can't pay again");
-- 
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