feat: Implement new get app auth clients API endpoint

packages/backend/src/controllers/api/v1/apps/get-auth-client.ee.js

@@ -0,0 +1,11 @@
+import { renderObject } from '../../../../helpers/renderer.js';
+import AppAuthClient from '../../../../models/app-auth-client.js';
+
+export default async (request, response) => {
+  const appAuthClient = await AppAuthClient.query()
+    .findById(request.params.appAuthClientId)
+    .where({ app_key: request.params.appKey, active: true })
+    .throwIfNotFound();
+
+  renderObject(response, appAuthClient);
+};

packages/backend/src/controllers/api/v1/apps/get-auth-client.ee.test.js

@@ -0,0 +1,50 @@
+import { vi, describe, it, expect, beforeEach } from 'vitest';
+import request from 'supertest';
+import Crypto from 'crypto';
+import app from '../../../../app.js';
+import createAuthTokenByUserId from '../../../../helpers/create-auth-token-by-user-id.js';
+import { createUser } from '../../../../../test/factories/user.js';
+import getAppAuthClientMock from '../../../../../test/mocks/rest/api/v1/apps/get-auth-client.js';
+import { createAppAuthClient } from '../../../../../test/factories/app-auth-client.js';
+import * as license from '../../../../helpers/license.ee.js';
+
+describe('GET /api/v1/apps/:appKey/auth-clients/:appAuthClientId', () => {
+  let currentUser, currentAppAuthClient, token;
+
+  beforeEach(async () => {
+    vi.spyOn(license, 'hasValidLicense').mockResolvedValue(true);
+
+    currentUser = await createUser();
+    currentAppAuthClient = await createAppAuthClient({
+      appKey: 'deepl',
+    });
+
+    token = createAuthTokenByUserId(currentUser.id);
+  });
+
+  it('should return specified app auth client', async () => {
+    const response = await request(app)
+      .get(`/api/v1/apps/deepl/auth-clients/${currentAppAuthClient.id}`)
+      .set('Authorization', token)
+      .expect(200);
+
+    const expectedPayload = getAppAuthClientMock(currentAppAuthClient);
+    expect(response.body).toEqual(expectedPayload);
+  });
+
+  it('should return not found response for not existing app auth client ID', async () => {
+    const notExistingAppAuthClientUUID = Crypto.randomUUID();
+
+    await request(app)
+      .get(`/api/v1/apps/deepl/auth-clients/${notExistingAppAuthClientUUID}`)
+      .set('Authorization', token)
+      .expect(404);
+  });
+
+  it('should return bad request response for invalid UUID', async () => {
+    await request(app)
+      .get('/api/v1/apps/deepl/auth-clients/invalidAppAuthClientUUID')
+      .set('Authorization', token)
+      .expect(400);
+  });
+});