From 00f0cda6a4c1ace9eea435e0bcc40a6004d70fdf Mon Sep 17 00:00:00 2001
From: Adam Soltys <asoltys@gmail.com>
Date: Mon, 19 Aug 2024 08:50:07 -0700
Subject: melt endpoint

---
 index.js        |  1 +
 routes/ecash.js | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index d280ee41..919ee5e5 100644
--- a/index.js
+++ b/index.js
@@ -120,6 +120,7 @@ app.post("/unlimit", admin, users.unlimit);
 
 app.post("/claim", auth, ecash.claim);
 app.post("/mint", auth, ecash.mint);
+app.post("/melt", auth, ecash.melt);
 
 let host = process.env.HOST || "0.0.0.0";
 let port = process.env.PORT || 3119;
diff --git a/routes/ecash.js b/routes/ecash.js
index e1877440..eb69798f 100644
--- a/routes/ecash.js
+++ b/routes/ecash.js
@@ -1,8 +1,10 @@
-import { g, s } from "$lib/db";
+import { g, s, db } from "$lib/db";
 import { claim, mint } from "$lib/ecash";
 import { bail } from "$lib/utils";
 import { debit, credit, types } from "$lib/payments";
 import { v4 } from "uuid";
+import { l, err, warn } from "$lib/logging";
+import { emit } from "$lib/sockets";
 import store from "$lib/store";
 
 let { ecash: type } = types;
@@ -46,4 +48,52 @@ export default {
       bail(res, e.message);
     }
   },
+
+  async melt({ body: { amount, bolt11: hash, preimage }, user }, res) {
+    try {
+      amount = Math.round(amount / 1000);
+      let ref = preimage;
+      let { lightning: type } = types;
+      if (user.username !== "mint") fail("unauthorized");
+      let { id: uid, currency, username } = user;
+      let ourfee = await db.debit(
+        `balance:${uid}`,
+        `credit:${type}:${uid}`,
+        amount || 0,
+        0,
+        0,
+        0,
+      );
+
+      let rate = store.rates[currency];
+
+      if (ourfee.err) fail(ourfee.err);
+
+      let id = v4();
+      let p = {
+        id,
+        amount: -amount,
+        hash,
+        ourfee,
+        uid,
+        confirmed: true,
+        rate,
+        currency,
+        type,
+        ref,
+        created: Date.now(),
+      };
+
+      await s(`payment:${hash}`, id);
+      await s(`payment:${id}`, p);
+      await db.lPush(`${uid}:payments`, id);
+
+      l(user.username, "sent", type, amount);
+      emit(user.id, "payment", p);
+
+      res.send(p);
+    } catch (e) {
+      bail(res, e.message);
+    }
+  },
 };
-- 
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