add useragent with package version

src/config.ts

@@ -36,11 +36,19 @@ import WebSocket from 'isomorphic-ws';
 import child_process from 'node:child_process';
 import { SocksProxyAgent } from 'socks-proxy-agent';
 import { HttpProxyAgent, HttpProxyAgentOptions, HttpsProxyAgent, HttpsProxyAgentOptions } from 'hpagent';
+import packagejson from '../package.json' with { type: 'json' };
+import { setHeaderMiddleware } from './middleware.js';
 
 const SERVICEACCOUNT_ROOT: string = '/var/run/secrets/kubernetes.io/serviceaccount';
 const SERVICEACCOUNT_CA_PATH: string = SERVICEACCOUNT_ROOT + '/ca.crt';
 const SERVICEACCOUNT_TOKEN_PATH: string = SERVICEACCOUNT_ROOT + '/token';
 const SERVICEACCOUNT_NAMESPACE_PATH: string = SERVICEACCOUNT_ROOT + '/namespace';
+const USER_AGENT_KEY = 'User-Agent';
+
+function getUserAgent(): string {
+    const version = packagejson.version ?? '';
+    return `kubernetes-client-javascript/${version}`;
+}
 
 // fs.existsSync was removed in node 10
 function fileExists(filepath: string): boolean {
@@ -491,6 +499,7 @@ export class KubeConfig implements SecurityAuthentication {
         const config: Configuration = createConfiguration({
             baseServer: baseServerConfig,
             authMethods: authConfig,
+            middleware: [setHeaderMiddleware(USER_AGENT_KEY, getUserAgent())],
         });
 
         const apiClient = new apiClientType(config);

src/config_test.ts

@@ -1,4 +1,4 @@
-import { after, before, beforeEach, describe, it, mock } from 'node:test';
+import { after, before, beforeEach, describe, it, mock, TestContext } from 'node:test';
 import assert, {
     deepEqual,
     deepStrictEqual,
@@ -1674,6 +1674,67 @@ describe('KubeConfig', () => {
             const client = kc.makeApiClient(CoreV1Api);
             strictEqual(client instanceof CoreV1Api, true);
         });
+
+        it('should include User-Agent header with version', async (t: TestContext) => {
+            let capturedUserAgent: string | undefined;
+
+            const { server, host, port } = await createTestHttpsServer((req, res) => {
+                capturedUserAgent = req.headers['user-agent'];
+
+                res.setHeader('Content-Type', 'application/json');
+                res.writeHead(200);
+                res.end(
+                    JSON.stringify({
+                        apiVersion: 'v1',
+                        kind: 'NamespaceList',
+                        items: [],
+                    }),
+                );
+            });
+            t.after(async () => {
+                await new Promise<Error | undefined>((resolve) => {
+                    server.close(resolve);
+                });
+            });
+
+            const kc = new KubeConfig();
+            kc.loadFromClusterAndUser(
+                {
+                    name: 'test-cluster',
+                    server: `https://${host}:${port}`,
+                    skipTLSVerify: true,
+                } as Cluster,
+                {
+                    name: 'test-user',
+                    token: 'test-token',
+                } as User,
+            );
+
+            const coreV1Api = kc.makeApiClient(CoreV1Api);
+            await coreV1Api.listNamespace();
+
+            // Read version from package.json
+            const packageJsonPath = join(__dirname, '..', 'package.json');
+            const packageJson = JSON.parse(readFileSync(packageJsonPath, 'utf-8'));
+            const expectedVersion = packageJson.version;
+
+            // Verify version is not blank
+            strictEqual(typeof expectedVersion, 'string');
+            strictEqual(expectedVersion.length > 0, true, 'package.json version should not be blank');
+
+            // Verify User-Agent header contains client name and version
+            strictEqual(typeof capturedUserAgent, 'string');
+            strictEqual(
+                capturedUserAgent!.startsWith('kubernetes-client-javascript/'),
+                true,
+                'capturedUserAgent should start with "kubernetes-javascript-client/"',
+            );
+            strictEqual(
+                capturedUserAgent!.endsWith(expectedVersion),
+                true,
+                `User-Agent should include version ${expectedVersion}`,
+            );
+        });
     });
 
     describe('EmptyConfig', () => {