launchpad-ledger: Add Node.js demo

packages/launchpad-ledger/demo/node.js

@@ -0,0 +1,14 @@
+const demo = require("../build/demo/node");
+
+async function run() {
+  const accounts = await demo.getAccounts();
+  console.info("Accounts from Ledger device:");
+  console.table(accounts);
+
+  const address = accounts[0].address;
+  const signature = await demo.sign(address, address);
+  console.info("Signature from Ledger device:");
+  console.info(signature);
+}
+
+run().catch(console.error);

packages/launchpad-ledger/src/demo/node.ts

@@ -0,0 +1,47 @@
+import { toHex, toUtf8 } from "@cosmjs/encoding";
+import { StdSignature } from "@cosmjs/launchpad";
+
+import { LedgerSigner } from "../ledgersigner";
+
+function createMessage(fromAddress: string, toAddress: string): string {
+  return `{
+    "account_number": 0,
+    "chain_id": "testing",
+    "fee": {
+      "amount": [{ "amount": 100, "denom": "ucosm" }],
+      "gas": 250
+    },
+    "memo": "Some memo",
+    "msgs": [{
+      "type": "cosmos-sdk/MsgSend",
+      "value": {
+        "amount": [{
+          "amount": "1234567",
+          "denom": "ucosm"
+        }],
+        "from_address": "${fromAddress}",
+        "to_address": "${toAddress}"
+      }
+    }],
+    "sequence": 0
+  }`;
+}
+
+const signer = new LedgerSigner({ testModeAllowed: true });
+
+export async function getAccounts(): Promise<
+  ReadonlyArray<{
+    readonly algo: string;
+    readonly address: string;
+    readonly pubkey: string;
+  }>
+> {
+  const accounts = await signer.getAccounts();
+  return accounts.map((account) => ({ ...account, pubkey: toHex(account.pubkey) }));
+}
+
+export async function sign(fromAddress: string, toAddress: string): Promise<StdSignature> {
+  const rawMessage = createMessage(fromAddress, toAddress);
+  const message = JSON.stringify(JSON.parse(rawMessage));
+  return signer.sign(fromAddress, toUtf8(message));
+}

packages/launchpad-ledger/webpack.demo.config.js

@@ -8,7 +8,7 @@ module.exports = [
   {
     // bundle used for Ledger demo
     target: target,
-    entry: glob.sync("./build/demo/index.js"),
+    entry: glob.sync("./build/demo/web.js"),
     output: {
       path: demodir,
       filename: "ledger.js",