From 80f67a648137a8ea2ef3715b3f80af290f384bb2 Mon Sep 17 00:00:00 2001
From: Adam Soltys <asoltys@gmail.com>
Date: Tue, 2 Jan 2024 15:19:12 -0800
Subject: liquid payments

---
 lib/payments.js | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 121 insertions(+), 7 deletions(-)

(limited to 'lib')

diff --git a/lib/payments.js b/lib/payments.js
index 88cf6845..b2c01e2f 100644
--- a/lib/payments.js
+++ b/lib/payments.js
@@ -5,7 +5,7 @@ import { v4 } from "uuid";
 import { notify } from "$lib/notifications";
 import { db, g, s, t } from "$lib/db";
 import { l, err, warn } from "$lib/logging";
-import { fail, sleep, wait, SATS } from "$lib/utils";
+import { btc, fail, sleep, wait, SATS, sats } from "$lib/utils";
 import { callWebhook } from "$lib/webhooks";
 import got from "got";
 import { spawn } from "child_process";
@@ -14,10 +14,18 @@ import fs from "fs";
 import EventEmitter from "events";
 import crc32 from "buffer-crc32";
 import { mqtt1, mqtt2 } from "$lib/mqtt";
-import ln from "$lib/ln";
 import { mail, templates } from "$lib/mail";
 
-export const types = {
+import lq from "$lib/liquid";
+import bc from "$lib/bitcoin";
+import ln from "$lib/ln";
+
+let api = {
+  bitcoin: "https://mempool.space/api/v1",
+  liquid: "https://liquid.network/api/v1",
+};
+
+export let types = {
   internal: "internal",
   bitcoin: "bitcoin",
   lightning: "lightning",
@@ -70,7 +78,7 @@ export let debit = async ({
     amount || 0,
     tip || 0,
     fee || 0,
-    ourfee || 0
+    ourfee || 0,
   );
 
   if (r !== "ok") fail("Problem debiting account");
@@ -193,7 +201,7 @@ export let credit = async (hash, amount, memo, ref, type = types.internal) => {
       sats:
         "⚡️" +
         new Intl.NumberFormat("en-US", { maximumFractionDigits: 0 }).format(
-          p.amount
+          p.amount,
         ),
       link: `${process.env.URL}/payment/${p.id}`,
     });
@@ -201,12 +209,12 @@ export let credit = async (hash, amount, memo, ref, type = types.internal) => {
 
   mqtt1.publish(
     username,
-    `pay:${p.amount}:${p.tip}:${p.rate}:${p.created}:${p.id}`
+    `pay:${p.amount}:${p.tip}:${p.rate}:${p.created}:${p.id}`,
   );
 
   mqtt2.publish(
     username,
-    `pay:${p.amount}:${p.tip}:${p.rate}:${p.created}:${p.id}`
+    `pay:${p.amount}:${p.tip}:${p.rate}:${p.created}:${p.id}`,
   );
 
   return p;
@@ -319,3 +327,109 @@ export let payLightning = async (user, payreq, amount, maxfee, memo) => {
 
   return p;
 };
+
+export let getNode = (type) => {
+  if (type === types.bitcoin) return bc;
+  else if (type === types.liquid) return lq;
+  else fail("unrecognized transaction type");
+};
+
+export let build = async ({ amount, address, feeRate }, user) => {
+  let type;
+
+  try {
+    await bc.getAddressInfo(address);
+    type = types.bitcoin;
+  } catch (e) {
+    try {
+      await lq.getAddressInfo(address);
+      type = types.liquid;
+    } catch (e) {
+      fail("unrecognized address");
+    }
+  }
+
+  let node = getNode(type);
+  amount = parseInt(amount);
+
+  let fees = await fetch(`${api[type]}/fees/recommended`).then((r) => r.json());
+
+  if (!feeRate) {
+    feeRate = fees.halfHourFee;
+  }
+
+  let replaceable = true;
+  let ourfee = Math.round(amount * config.fee);
+  let credit = await g(`credit:${type}:${user.id}`);
+  let covered = Math.min(credit, ourfee) || 0;
+  ourfee -= covered;
+
+  let outs = [{ [address]: btc(amount) }];
+
+  if (type === types.liquid)
+    outs = outs.map((o) => ({ ...o, asset: config.liquid.btc }));
+
+  let raw = await node.createRawTransaction([], outs, 0, replaceable);
+
+  let tx = await node.fundRawTransaction(raw, {
+    fee_rate: feeRate,
+    replaceable,
+    subtractFeeFromOutputs: [],
+  });
+
+  let fee = sats(tx.fee);
+  let dust = 547;
+
+  let balance = await g(`balance:${user.id}`);
+
+  if (amount + fee + ourfee > balance) {
+    if (amount <= fee + ourfee + dust) fail("insufficient funds");
+
+    outs = [{ [address]: btc(amount - ourfee) }];
+    raw = await node.createRawTransaction([], outs, 0, replaceable);
+
+    tx = await node.fundRawTransaction(raw, {
+      fee_rate: feeRate,
+      replaceable,
+      subtractFeeFromOutputs: [0],
+    });
+
+    fee = sats(tx.fee);
+  }
+
+  return { feeRate, ourfee, fee, fees, hex: tx.hex };
+};
+
+let seen = await db.sMembers("missing");
+let catchUp = async () => {
+  try {
+    let txns = [];
+    for (let [type, n] of Object.entries({ bitcoin: bc, liquid: lq })) {
+      txns.push(
+        ...(await n.listTransactions("*", 50)).filter((tx) => {
+          tx.type = type;
+          return tx.category === "receive" && tx.confirmations > 0;
+        }),
+      );
+    }
+
+    for (let { txid, type } of txns) {
+      try {
+        if (seen.includes(txid)) continue;
+        await got.post(`http://localhost:${process.env.PORT || 3119}/confirm`, {
+          json: { txid, wallet: config.bitcoin.wallet, type },
+        });
+
+        seen.push(txid);
+      } catch (e) {
+          err("problem confirming", e.message);
+      }
+    }
+  } catch (e) {
+    err("problem syncing", e.message);
+  }
+
+  setTimeout(catchUp, 2000);
+};
+
+catchUp();
-- 
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