Add rotate key example (#213)

* add rotate key example

* lint

examples/typescript/rotate_key.ts

@@ -0,0 +1,53 @@
+/* eslint-disable no-console */
+
+import { Account, AccountAddress, Aptos, AptosConfig, Network, NetworkToNetworkName } from "@aptos-labs/ts-sdk";
+
+const WIDTH = 16;
+
+// Setup the client
+const APTOS_NETWORK: Network = NetworkToNetworkName[process.env.APTOS_NETWORK] || Network.DEVNET;
+const config = new AptosConfig({ network: APTOS_NETWORK });
+const aptos = new Aptos(config);
+
+function truncate(address: AccountAddress): string {
+  return `${address.toString().substring(0, 6)}...${address
+    .toString()
+    .substring(address.toString().length - 4, address.toString().length)}`;
+}
+
+function formatAccountInfo(account: Account): string {
+  const vals: any[] = [
+    account.accountAddress,
+    Account.authKey({ publicKey: account.publicKey }),
+    account.privateKey,
+    account.publicKey,
+  ];
+
+  return vals.map((v) => truncate(v).padEnd(WIDTH)).join(" ");
+}
+
+(async () => {
+  const alice = Account.generate();
+  const bob = Account.generate();
+
+  await aptos.fundAccount({ accountAddress: alice.accountAddress, amount: 1000000000 });
+  await aptos.fundAccount({ accountAddress: bob.accountAddress, amount: 1000000000 });
+
+  console.log(
+    `\n${"Account".padEnd(WIDTH)} ${"Address".padEnd(WIDTH)} ${"Auth Key".padEnd(WIDTH)} ${"Private Key".padEnd(
+      WIDTH,
+    )} ${"Public Key".padEnd(WIDTH)}`,
+  );
+  console.log("---------------------------------------------------------------------------------");
+  console.log(`${"alice".padEnd(WIDTH)} ${formatAccountInfo(alice)}`);
+  console.log(`${"bob".padEnd(WIDTH)} ${formatAccountInfo(bob)}`);
+  console.log("\n...rotating...".padStart(WIDTH));
+
+  // Rotate the key!
+  await aptos.rotateAuthKey({ fromAccount: alice, toNewPrivateKey: bob.privateKey });
+
+  const aliceNew = Account.fromPrivateKeyAndAddress({ privateKey: bob.privateKey, address: alice.accountAddress });
+
+  console.log(`\n${"alice".padEnd(WIDTH)} ${formatAccountInfo(aliceNew)}`);
+  console.log(`${"bob".padEnd(WIDTH)} ${formatAccountInfo(bob)}\n`);
+})();