refactor: extract common app setup code

This allows the E2E tests and the real app to share the same setup.

Fixes #2083

Signed-off-by: David Mehren <git@herrmehren.de>

src/app-init.ts

@@ -0,0 +1,80 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { HttpAdapterHost } from '@nestjs/core';
+import { NestExpressApplication } from '@nestjs/platform-express';
+
+import { AppConfig } from './config/app.config';
+import { AuthConfig } from './config/auth.config';
+import { DatabaseConfig } from './config/database.config';
+import { MediaConfig } from './config/media.config';
+import { ErrorExceptionMapping } from './errors/error-mapping';
+import { ConsoleLoggerService } from './logger/console-logger.service';
+import { BackendType } from './media/backends/backend-type.enum';
+import { setupSpecialGroups } from './utils/createSpecialGroups';
+import { setupFrontendProxy } from './utils/frontend-integration';
+import { setupSessionMiddleware } from './utils/session';
+import { setupValidationPipe } from './utils/setup-pipes';
+import { setupPrivateApiDocs, setupPublicApiDocs } from './utils/swagger';
+
+/**
+ * Common setup function which is called by main.ts and the E2E tests.
+ */
+export async function setupApp(
+  app: NestExpressApplication,
+  appConfig: AppConfig,
+  authConfig: AuthConfig,
+  databaseConfig: DatabaseConfig,
+  mediaConfig: MediaConfig,
+  logger: ConsoleLoggerService,
+): Promise<void> {
+  setupPublicApiDocs(app);
+  logger.log(
+    `Serving OpenAPI docs for public api under '/apidoc'`,
+    'AppBootstrap',
+  );
+
+  if (process.env.NODE_ENV === 'development') {
+    setupPrivateApiDocs(app);
+    logger.log(
+      `Serving OpenAPI docs for private api under '/private/apidoc'`,
+      'AppBootstrap',
+    );
+
+    await setupFrontendProxy(app, logger);
+  }
+
+  await setupSpecialGroups(app);
+
+  setupSessionMiddleware(app, authConfig, databaseConfig);
+
+  app.enableCors({
+    origin: appConfig.rendererOrigin,
+  });
+  logger.log(`Enabling CORS for '${appConfig.rendererOrigin}'`, 'AppBootstrap');
+
+  app.useGlobalPipes(setupValidationPipe(logger));
+
+  if (mediaConfig.backend.use === BackendType.FILESYSTEM) {
+    logger.log(
+      `Serving the local folder '${mediaConfig.backend.filesystem.uploadPath}' under '/uploads'`,
+      'AppBootstrap',
+    );
+    app.useStaticAssets(mediaConfig.backend.filesystem.uploadPath, {
+      prefix: '/uploads/',
+    });
+  }
+
+  logger.log(
+    `Serving the local folder 'public' under '/public'`,
+    'AppBootstrap',
+  );
+  app.useStaticAssets('public', {
+    prefix: '/public/',
+  });
+
+  const { httpAdapter } = app.get(HttpAdapterHost);
+  app.useGlobalFilters(new ErrorExceptionMapping(httpAdapter));
+}