fix(repository): Move backend code into subdirectory

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

backend/src/config/database.config.ts

@@ -0,0 +1,73 @@
+/*
+ * 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 { DatabaseType } from './database-type.enum';
+import { buildErrorMessage, parseOptionalNumber } from './utils';
+
+export interface DatabaseConfig {
+  username: string;
+  password: string;
+  database: string;
+  host: string;
+  port: number;
+  type: DatabaseType;
+}
+
+const databaseSchema = Joi.object({
+  type: Joi.string()
+    .valid(...Object.values(DatabaseType))
+    .label('HD_DATABASE_TYPE'),
+
+  // This is the database name, except for SQLite,
+  // where it is the path to the database file.
+  database: Joi.string().label('HD_DATABASE_NAME'),
+  username: Joi.when('type', {
+    is: Joi.invalid(DatabaseType.SQLITE),
+    then: Joi.string(),
+    otherwise: Joi.optional(),
+  }).label('HD_DATABASE_USER'),
+  password: Joi.when('type', {
+    is: Joi.invalid(DatabaseType.SQLITE),
+    then: Joi.string(),
+    otherwise: Joi.optional(),
+  }).label('HD_DATABASE_PASS'),
+  host: Joi.when('type', {
+    is: Joi.invalid(DatabaseType.SQLITE),
+    then: Joi.string(),
+    otherwise: Joi.optional(),
+  }).label('HD_DATABASE_HOST'),
+  port: Joi.when('type', {
+    is: Joi.invalid(DatabaseType.SQLITE),
+    then: Joi.number(),
+    otherwise: Joi.optional(),
+  }).label('HD_DATABASE_PORT'),
+});
+
+export default registerAs('databaseConfig', () => {
+  const databaseConfig = databaseSchema.validate(
+    {
+      type: process.env.HD_DATABASE_TYPE,
+      username: process.env.HD_DATABASE_USER,
+      password: process.env.HD_DATABASE_PASS,
+      database: process.env.HD_DATABASE_NAME,
+      host: process.env.HD_DATABASE_HOST,
+      port: parseOptionalNumber(process.env.HD_DATABASE_PORT),
+    },
+    {
+      abortEarly: false,
+      presence: 'required',
+    },
+  );
+  if (databaseConfig.error) {
+    const errorMessages = databaseConfig.error.details.map(
+      (detail) => detail.message,
+    );
+    throw new Error(buildErrorMessage(errorMessages));
+  }
+  return databaseConfig.value as DatabaseConfig;
+});