fix(repository): Move backend code into subdirectory

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

backend/src/config/app.config.ts

@@ -0,0 +1,74 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { registerAs } from '@nestjs/config';
+import * as Joi from 'joi';
+
+import { Loglevel } from './loglevel.enum';
+import { buildErrorMessage, parseOptionalNumber } from './utils';
+
+export interface AppConfig {
+  domain: string;
+  rendererBaseUrl: string;
+  port: number;
+  loglevel: Loglevel;
+  persistInterval: number;
+}
+
+const schema = Joi.object({
+  domain: Joi.string()
+    .uri({
+      scheme: /https?/,
+    })
+    .label('HD_DOMAIN'),
+  rendererBaseUrl: Joi.string()
+    .uri({
+      scheme: /https?/,
+    })
+    .default(Joi.ref('domain'))
+    .optional()
+    .label('HD_RENDERER_BASE_URL'),
+  port: Joi.number()
+    .positive()
+    .integer()
+    .default(3000)
+    .max(65535)
+    .optional()
+    .label('PORT'),
+  loglevel: Joi.string()
+    .valid(...Object.values(Loglevel))
+    .default(Loglevel.WARN)
+    .optional()
+    .label('HD_LOGLEVEL'),
+  persistInterval: Joi.number()
+    .integer()
+    .min(0)
+    .default(10)
+    .optional()
+    .label('HD_PERSIST_INTERVAL'),
+});
+
+export default registerAs('appConfig', () => {
+  const appConfig = schema.validate(
+    {
+      domain: process.env.HD_DOMAIN,
+      rendererBaseUrl: process.env.HD_RENDERER_BASE_URL,
+      port: parseOptionalNumber(process.env.PORT),
+      loglevel: process.env.HD_LOGLEVEL,
+      persistInterval: process.env.HD_PERSIST_INTERVAL,
+    },
+    {
+      abortEarly: false,
+      presence: 'required',
+    },
+  );
+  if (appConfig.error) {
+    const errorMessages = appConfig.error.details.map(
+      (detail) => detail.message,
+    );
+    throw new Error(buildErrorMessage(errorMessages));
+  }
+  return appConfig.value as AppConfig;
+});