Merge branch 'feature-withdrawal-fee'

2 files changed, 16 insertions, 0 deletions

diff --git a/routes/lightning/conversionFee.js b/routes/lightning/conversionFee.js
new file mode 100644
index 00000000..7359bb3f
--- /dev/null
+++ b/routes/lightning/conversionFee.js
@@ -0,0 +1,12 @@
+// Code for the conversion fee
+// This is in a separate file so that the same function can be used by ./send and ./receive
+
+const conversionFeeMultiplier = 0.01;
+const conversionFeeReceiver = "coinosfees";  // account that receives the fees
+
+/**
+ * Returns the fee you have to pay for withdrawing 'amount' lightning BTC.
+ */
+function computeConversionFee(amount) {
+  return Math.floor(amount * conversionFeeMultiplier);
+}
diff --git a/routes/lightning/receive.js b/routes/lightning/receive.js
index 6723d577..6d10eb9b 100644
--- a/routes/lightning/receive.js
+++ b/routes/lightning/receive.js
@@ -1,3 +1,5 @@
+const { computeConversionFee } = require('./conversionFee.js');
+
 const handlePayment = async (msg) => {
   l.info("incoming lightning payment", msg.value, msg.payment_request, msg.settled);
   if (!msg.settled) return;
@@ -60,6 +62,8 @@ const handlePayment = async (msg) => {
       invoice.received += total;
 
       await account.increment({ balance: total }, { transaction });
+      // get the # of fee credits you would need to pay off this amount of bitcoin
+      await account.increment({ btc_credits: computeConversionFee(total) }, { transaction });
       await account.reload({ transaction });
       await invoice.save({ transaction });
       await payment.save({ transaction });