refactor(config): extract note config from app config

This commit separates the app config object from a new note config object. This was done to separate different concerns in different config files. Especially if the number of settings that are about notes increase, it is a good idea to keep them separate from the app config.

Signed-off-by: Philip Molares <philip.molares@udo.edu>

src/config/note.config.ts

@@ -0,0 +1,46 @@
+/*
+ * 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 { buildErrorMessage, parseOptionalInt, toArrayConfig } from './utils';
+
+export interface NoteConfig {
+  forbiddenNoteIds: string[];
+  maxDocumentLength: number;
+}
+
+const schema = Joi.object({
+  forbiddenNoteIds: Joi.array()
+    .items(Joi.string())
+    .optional()
+    .default([])
+    .label('HD_FORBIDDEN_NOTE_IDS'),
+  maxDocumentLength: Joi.number()
+    .default(100000)
+    .optional()
+    .label('HD_MAX_DOCUMENT_LENGTH'),
+});
+
+export default registerAs('noteConfig', () => {
+  const noteConfig = schema.validate(
+    {
+      forbiddenNoteIds: toArrayConfig(process.env.HD_FORBIDDEN_NOTE_IDS, ','),
+      maxDocumentLength: parseOptionalInt(process.env.HD_MAX_DOCUMENT_LENGTH),
+    },
+    {
+      abortEarly: false,
+      presence: 'required',
+    },
+  );
+  if (noteConfig.error) {
+    const errorMessages = noteConfig.error.details.map(
+      (detail) => detail.message,
+    );
+    throw new Error(buildErrorMessage(errorMessages));
+  }
+  return noteConfig.value as NoteConfig;
+});