Rework donation to use local lnd

api.ts

@@ -1,8 +1,11 @@
 import { Router } from "https://deno.land/x/oak/mod.ts";
+import { exec, OutputMode } from "https://deno.land/x/exec/mod.ts";
 
 import { getBlocks } from "./blocks.ts";
 import { getblockchaininfo, getblockcount, getblockhash } from "./jsonrpc/index.ts";
 import Pageviews from "./pageviews/index.ts";
+import config from "./config/config.ts";
+import { bytesToHexString } from "./utils.ts";
 
 const router = new Router();
 
@@ -23,6 +26,7 @@ router
         status: "ERROR",
         reason: "Missing param height",
       });
+      return;
     }
     const blockhash = await getblockhash(Number.parseInt(context.params.height));
     context.response.body = blockhash;
@@ -37,4 +41,24 @@ router.get("/blocks", (context) => {
   context.response.body = blocks;
 });
 
+router.get("/invoice", async (context) => {
+  if (!config.donation) {
+    context.response.status = 400;
+    context.response.body = JSON.stringify({
+      status: "ERROR",
+      reason: "Donation is not configured",
+    });
+    return;
+  }
+
+  const macaroonHeader = bytesToHexString(await Deno.readFile(config.donation.data.macaroon));
+  // -d '{"memo":"Donation"}'
+  const command = `curl -X POST --cacert ${config.donation.data.cert} --header "Grpc-Metadata-macaroon: ${macaroonHeader}" ${config.donation.data.server}/v1/invoices`;
+
+  const result = await exec(command, {
+    output: OutputMode.Capture,
+  });
+  context.response.body = JSON.parse(result.output).payment_request;
+});
+
 export default router;

config/config.ts_TEMPLATE

@@ -29,6 +29,21 @@ interface Config {
     // Threshold for the softfork to be locked in
     threshold: number;
   };
+
+  // Donation configuration, right now only supports lnd
+  donation?: {
+    // Backend type, currently only supports lnd
+    type: "lnd";
+    // Data for the backend
+    data: {
+      // REST server
+      server: string;
+      // Path to tls.cert
+      cert: string;
+      // Path to invoice.macaroon
+      macaroon: string;
+    };
+  };
 }
 
 const config: Config = {
@@ -49,6 +64,15 @@ const config: Config = {
     versionBit: 2,
     threshold: 1845,
   },
+
+  // donation: {
+  //   type: "lnd",
+  //   data: {
+  //     server: "https://127.0.0.1:8080",
+  //     cert: "/path/to/tls.cert",
+  //     macaroon: "/path/to/invoice.macaroon",
+  //   },
+  // },
 };
 
 export default config;

frontend/components/Donation.tsx

@@ -1,9 +1,6 @@
 import React, { useState } from "https://esm.sh/react@17.0.2";
 import styled from "https://esm.sh/styled-components";
 import { QRCode } from "https://esm.sh/react-qr-svg";
-import { Link } from "https://deno.land/x/aleph@v0.2.28/mod.ts";
-
-const DONATION_LNURL_PAY = "LNURL1DP68GURN8GHJ7MRWVF5HGUEWVDHK6TMVDE6HYMRS9ASHQ6F0WCCJ7MRWW4EXCTE38Y6QYWETXD";
 
 export const DonateContainer = styled.div`
   text-align: center;
@@ -18,22 +15,27 @@ export const DonateText = styled.a`
 `;
 
 export function Donation() {
-  const [showQr, setShowQr] = useState(false);
+  const [invoice, setInvoice] = useState<string | undefined>(undefined);
+
+  const fetchInvoice = async () => {
+    const result = await fetch("/invoice");
+    setInvoice(await result.text());
+  };
 
   return (
     <DonateContainer>
-      {!showQr && <DonateText onClick={() => setShowQr(true)}>Donate via Lightning Network</DonateText>}
+      {!invoice && <DonateText onClick={fetchInvoice}>Donate via Lightning Network</DonateText>}
-      {showQr && (
+      {invoice && (
         <div
           style={{ cursor: "pointer" }}
           onClick={() => {
-            window.location.replace("lightning:" + DONATION_LNURL_PAY.toLowerCase());
+            window.location.replace("lightning:" + invoice);
           }}
         >
           <QRCode
             bgColor="#FFFFFF"
             fgColor="#000000"
-            value={DONATION_LNURL_PAY}
+            value={invoice.toUpperCase()}
             style={{ border: "8px solid #fff", width: 200 }}
           />
         </div>

run-server.sh

@@ -6,4 +6,4 @@ mkdir frontend/dist
 deno run -A https://deno.land/x/aleph@v0.3.0-alpha.32/cli.ts build frontend --reload
 
 # Run backend
-deno run --unstable --allow-net --allow-read --allow-write index.ts
+deno run --unstable --allow-net --allow-read --allow-write --allow-run index.ts

utils.ts

@@ -0,0 +1,5 @@
+export const bytesToHexString = (bytes: Uint8Array) => {
+  return bytes.reduce(function (memo: unknown, i: number) {
+    return memo + ("0" + i.toString(16)).slice(-2); //padd with leading 0 if <16
+  }, "");
+};