Migrate /translations route to core (#83280)

* move i18n route to core

* add FTR test for endpoint

src/core/server/i18n/i18n_service.test.mocks.ts

@@ -26,3 +26,8 @@ export const initTranslationsMock = jest.fn();
 jest.doMock('./init_translations', () => ({
   initTranslations: initTranslationsMock,
 }));
+
+export const registerRoutesMock = jest.fn();
+jest.doMock('./routes', () => ({
+  registerRoutes: registerRoutesMock,
+}));

src/core/server/i18n/i18n_service.test.ts

@@ -17,13 +17,18 @@
  * under the License.
  */
 
-import { getKibanaTranslationFilesMock, initTranslationsMock } from './i18n_service.test.mocks';
+import {
+  getKibanaTranslationFilesMock,
+  initTranslationsMock,
+  registerRoutesMock,
+} from './i18n_service.test.mocks';
 
 import { BehaviorSubject } from 'rxjs';
 import { I18nService } from './i18n_service';
 
 import { configServiceMock } from '../config/mocks';
 import { mockCoreContext } from '../core_context.mock';
+import { httpServiceMock } from '../http/http_service.mock';
 
 const getConfigService = (locale = 'en') => {
   const configService = configServiceMock.create();
@@ -41,21 +46,24 @@ const getConfigService = (locale = 'en') => {
 describe('I18nService', () => {
   let service: I18nService;
   let configService: ReturnType<typeof configServiceMock.create>;
+  let http: ReturnType<typeof httpServiceMock.createInternalSetupContract>;
 
   beforeEach(() => {
     jest.clearAllMocks();
     configService = getConfigService();
 
     const coreContext = mockCoreContext.create({ configService });
     service = new I18nService(coreContext);
+
+    http = httpServiceMock.createInternalSetupContract();
   });
 
   describe('#setup', () => {
     it('calls `getKibanaTranslationFiles` with the correct parameters', async () => {
       getKibanaTranslationFilesMock.mockResolvedValue([]);
 
       const pluginPaths = ['/pathA', '/pathB'];
-      await service.setup({ pluginPaths });
+      await service.setup({ pluginPaths, http });
 
       expect(getKibanaTranslationFilesMock).toHaveBeenCalledTimes(1);
       expect(getKibanaTranslationFilesMock).toHaveBeenCalledWith('en', pluginPaths);
@@ -65,17 +73,27 @@ describe('I18nService', () => {
       const translationFiles = ['/path/to/file', 'path/to/another/file'];
       getKibanaTranslationFilesMock.mockResolvedValue(translationFiles);
 
-      await service.setup({ pluginPaths: [] });
+      await service.setup({ pluginPaths: [], http });
 
       expect(initTranslationsMock).toHaveBeenCalledTimes(1);
       expect(initTranslationsMock).toHaveBeenCalledWith('en', translationFiles);
     });
 
+    it('calls `registerRoutesMock` with the correct parameters', async () => {
+      await service.setup({ pluginPaths: [], http });
+
+      expect(registerRoutesMock).toHaveBeenCalledTimes(1);
+      expect(registerRoutesMock).toHaveBeenCalledWith({
+        locale: 'en',
+        router: expect.any(Object),
+      });
+    });
+
     it('returns accessors for locale and translation files', async () => {
       const translationFiles = ['/path/to/file', 'path/to/another/file'];
       getKibanaTranslationFilesMock.mockResolvedValue(translationFiles);
 
-      const { getLocale, getTranslationFiles } = await service.setup({ pluginPaths: [] });
+      const { getLocale, getTranslationFiles } = await service.setup({ pluginPaths: [], http });
 
       expect(getLocale()).toEqual('en');
       expect(getTranslationFiles()).toEqual(translationFiles);

src/core/server/i18n/i18n_service.ts

@@ -21,11 +21,14 @@ import { take } from 'rxjs/operators';
 import { Logger } from '../logging';
 import { IConfigService } from '../config';
 import { CoreContext } from '../core_context';
+import { InternalHttpServiceSetup } from '../http';
 import { config as i18nConfigDef, I18nConfigType } from './i18n_config';
 import { getKibanaTranslationFiles } from './get_kibana_translation_files';
 import { initTranslations } from './init_translations';
+import { registerRoutes } from './routes';
 
 interface SetupDeps {
+  http: InternalHttpServiceSetup;
   pluginPaths: string[];
 }
 
@@ -53,7 +56,7 @@ export class I18nService {
     this.configService = coreContext.configService;
   }
 
-  public async setup({ pluginPaths }: SetupDeps): Promise<I18nServiceSetup> {
+  public async setup({ pluginPaths, http }: SetupDeps): Promise<I18nServiceSetup> {
     const i18nConfig = await this.configService
       .atPath<I18nConfigType>(i18nConfigDef.path)
       .pipe(take(1))
@@ -67,6 +70,9 @@ export class I18nService {
     this.log.debug(`Using translation files: [${translationFiles.join(', ')}]`);
     await initTranslations(locale, translationFiles);
 
+    const router = http.createRouter('');
+    registerRoutes({ router, locale });
+
     return {
       getLocale: () => locale,
       getTranslationFiles: () => translationFiles,

src/core/server/i18n/routes/index.ts

@@ -0,0 +1,25 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { IRouter } from '../../http';
+import { registerTranslationsRoute } from './translations';
+
+export const registerRoutes = ({ router, locale }: { router: IRouter; locale: string }) => {
+  registerTranslationsRoute(router, locale);
+};

src/core/server/i18n/routes/translations.ts

@@ -0,0 +1,69 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { createHash } from 'crypto';
+import { i18n } from '@kbn/i18n';
+import { schema } from '@kbn/config-schema';
+import { IRouter } from '../../http';
+
+interface TranslationCache {
+  translations: string;
+  hash: string;
+}
+
+export const registerTranslationsRoute = (router: IRouter, locale: string) => {
+  let translationCache: TranslationCache;
+
+  router.get(
+    {
+      path: '/translations/{locale}.json',
+      validate: {
+        params: schema.object({
+          locale: schema.string(),
+        }),
+      },
+      options: {
+        authRequired: false,
+      },
+    },
+    (ctx, req, res) => {
+      if (req.params.locale.toLowerCase() !== locale.toLowerCase()) {
+        return res.notFound({
+          body: `Unknown locale: ${req.params.locale}`,
+        });
+      }
+      if (!translationCache) {
+        const translations = JSON.stringify(i18n.getTranslation());
+        const hash = createHash('sha1').update(translations).digest('hex');
+        translationCache = {
+          translations,
+          hash,
+        };
+      }
+      return res.ok({
+        headers: {
+          'content-type': 'application/json',
+          'cache-control': 'must-revalidate',
+          etag: translationCache.hash,
+        },
+        body: translationCache.translations,
+      });
+    }
+  );
+};

src/core/server/server.ts

@@ -131,9 +131,6 @@ export class Server {
       await ensureValidConfiguration(this.configService, legacyConfigSetup);
     }
 
-    // setup i18n prior to any other service, to have translations ready
-    const i18nServiceSetup = await this.i18n.setup({ pluginPaths });
-
     const contextServiceSetup = this.context.setup({
       // We inject a fake "legacy plugin" with dependencies on every plugin so that legacy plugins:
       // 1) Can access context from any KP plugin
@@ -149,6 +146,9 @@ export class Server {
       context: contextServiceSetup,
     });
 
+    // setup i18n prior to any other service, to have translations ready
+    const i18nServiceSetup = await this.i18n.setup({ http: httpSetup, pluginPaths });
+
     const capabilitiesSetup = this.capabilities.setup({ http: httpSetup });
 
     const elasticsearchServiceSetup = await this.elasticsearch.setup({

src/legacy/ui/ui_render/ui_render_mixin.js

@@ -17,9 +17,7 @@
  * under the License.
  */
 
-import { createHash } from 'crypto';
 import Boom from '@hapi/boom';
-import { i18n } from '@kbn/i18n';
 import * as UiSharedDeps from '@kbn/ui-shared-deps';
 import { KibanaRequest } from '../../../core/server';
 import { AppBootstrap } from './bootstrap';
@@ -37,36 +35,6 @@ import { getApmConfig } from '../apm';
  * @param {KbnServer['config']} config
  */
 export function uiRenderMixin(kbnServer, server, config) {
-  const translationsCache = { translations: null, hash: null };
-  server.route({
-    path: '/translations/{locale}.json',
-    method: 'GET',
-    config: { auth: false },
-    handler(request, h) {
-      // Kibana server loads translations only for a single locale
-      // that is specified in `i18n.locale` config value.
-      const { locale } = request.params;
-      if (i18n.getLocale() !== locale.toLowerCase()) {
-        throw Boom.notFound(`Unknown locale: ${locale}`);
-      }
-
-      // Stringifying thousands of labels and calculating hash on the resulting
-      // string can be expensive so it makes sense to do it once and cache.
-      if (translationsCache.translations == null) {
-        translationsCache.translations = JSON.stringify(i18n.getTranslation());
-        translationsCache.hash = createHash('sha1')
-          .update(translationsCache.translations)
-          .digest('hex');
-      }
-
-      return h
-        .response(translationsCache.translations)
-        .header('cache-control', 'must-revalidate')
-        .header('content-type', 'application/json')
-        .etag(translationsCache.hash);
-    },
-  });
-
   const authEnabled = !!server.auth.settings.default;
   server.route({
     path: '/bootstrap.js',

test/api_integration/apis/core/compression.ts

@@ -0,0 +1,55 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import expect from '@kbn/expect';
+import { FtrProviderContext } from '../../ftr_provider_context';
+
+export default function ({ getService }: FtrProviderContext) {
+  const supertest = getService('supertest');
+
+  describe('compression', () => {
+    it(`uses compression when there isn't a referer`, async () => {
+      await supertest
+        .get('/app/kibana')
+        .set('accept-encoding', 'gzip')
+        .then((response) => {
+          expect(response.header).to.have.property('content-encoding', 'gzip');
+        });
+    });
+
+    it(`uses compression when there is a whitelisted referer`, async () => {
+      await supertest
+        .get('/app/kibana')
+        .set('accept-encoding', 'gzip')
+        .set('referer', 'https://some-host.com')
+        .then((response) => {
+          expect(response.header).to.have.property('content-encoding', 'gzip');
+        });
+    });
+
+    it(`doesn't use compression when there is a non-whitelisted referer`, async () => {
+      await supertest
+        .get('/app/kibana')
+        .set('accept-encoding', 'gzip')
+        .set('referer', 'https://other.some-host.com')
+        .then((response) => {
+          expect(response.header).not.to.have.property('content-encoding');
+        });
+    });
+  });
+}