refactor(keypair): extract keypair generation to separate module

- Move keypair generation logic to utils/keypair.js
- Create generateAndSaveKeyPair function with configurable output path
- Update relay.js to use new module
- Add proper error handling and return values
- Improve code organization and separation of concerns

Makes keypair generation reusable and easier to maintain

relay/package.json

@@ -1,6 +1,6 @@
 {
   "name": "libp2p-relay",
-  "version": "0.12.27",
+  "version": "0.12.28",
   "private": true,
   "scripts": {
     "start:no-restart": "node src/relay.js",

relay/src/relay.js

@@ -1,15 +1,7 @@
 import 'dotenv/config';
 import yargs from 'yargs';
 import { hideBin } from 'yargs/helpers';
-import fs from 'fs/promises';
 // External libraries
-import { fromString as uint8ArrayFromString } from 'uint8arrays/from-string';
-import { toString as uint8ArrayToString } from 'uint8arrays/to-string';
-import {
-  generateKeyPair,
-  privateKeyToProtobuf,
-  privateKeyFromProtobuf,
-} from '@libp2p/crypto/keys';
 import { unixfs } from '@helia/unixfs';
 import { CID } from 'multiformats/cid';
 
@@ -26,6 +18,7 @@ import { createHttpServer } from './httpServer.js';
 import { createNode } from './nodeFactory.js';
 import { setupPubsub } from './pubsubHandler.js';
 import TipWatcher from './pinner/tipWatcher.js';
+import { generateAndSaveKeyPair } from './utils/keypair.js';
 
 export const CONTENT_TOPIC =
   process.env.CONTENT_TOPIC || '/doichain-nfc/1/message/proto';
@@ -79,28 +72,9 @@ const argv = yargs(hideBin(process.argv))
 
 if (argv['generate-keypair']) {
   try {
-    const newKeyPair = await generateKeyPair('Ed25519');
-    const protobufKey = privateKeyToProtobuf(newKeyPair);
-    const privateKeyHex = uint8ArrayToString(protobufKey, 'hex');
-
-    console.log('New private key generated. Add this to your .env file:');
-    console.log(`RELAY_PRIVATE_KEY=${privateKeyHex}`);
-
-    // Optionally, write to a file
-    await fs.writeFile(
-      './.env.privateKey',
-      `RELAY_PRIVATE_KEY=${privateKeyHex}`,
-      'utf8'
-    );
-    console.log('Private key has been saved to .env.privateKey');
-
-    // Verify the key can be correctly parsed back
-    privateKeyFromProtobuf(uint8ArrayFromString(privateKeyHex, 'hex'));
-    console.log('Verified: Key can be correctly parsed back from hex format');
-
-    process.exit(0); // Exit after generating the keypair
+    await generateAndSaveKeyPair();
+    process.exit(0);
   } catch (error) {
-    console.error('Error generating keypair:', error);
     process.exit(1);
   }
 }

relay/src/utils/keypair.js

@@ -0,0 +1,31 @@
+import { generateKeyPair, privateKeyToProtobuf, privateKeyFromProtobuf } from '@libp2p/crypto/keys';
+import { fromString as uint8ArrayFromString, toString as uint8ArrayToString } from 'uint8arrays';
+import fs from 'fs/promises';
+
+export async function generateAndSaveKeyPair(outputPath = './.env.privateKey') {
+  try {
+    const newKeyPair = await generateKeyPair('Ed25519');
+    const protobufKey = privateKeyToProtobuf(newKeyPair);
+    const privateKeyHex = uint8ArrayToString(protobufKey, 'hex');
+
+    console.log('New private key generated. Add this to your .env file:');
+    console.log(`RELAY_PRIVATE_KEY=${privateKeyHex}`);
+
+    // Write to specified file
+    await fs.writeFile(
+      outputPath,
+      `RELAY_PRIVATE_KEY=${privateKeyHex}`,
+      'utf8'
+    );
+    console.log(`Private key has been saved to ${outputPath}`);
+
+    // Verify the key can be correctly parsed back
+    privateKeyFromProtobuf(uint8ArrayFromString(privateKeyHex, 'hex'));
+    console.log('Verified: Key can be correctly parsed back from hex format');
+
+    return privateKeyHex;
+  } catch (error) {
+    console.error('Error generating keypair:', error);
+    throw error;
+  }
+}