initial commit

src/util/settings.ts

@@ -0,0 +1,50 @@
+import type { Database } from '@db/database.ts';
+
+export async function setSettings<K extends SettingKey>(db: Database, settings: { [k in K]: SettingKeyValueType<K> }) {
+  const dbSettings = Object.entries(settings).map(([name, value]) => ({ name, value: JSON.stringify(value) }));
+
+  await db.setSettings({ settings: dbSettings });
+}
+
+export async function getSetting<K extends SettingKey>(db: Database, key: K): Promise<SettingKeyValueType<K> | null>;
+export async function getSetting<K extends SettingKey, D extends SettingKeyValueType<K>>(
+  db: Database,
+  key: K,
+  defaultValue: D
+): Promise<SettingKeyValueType<K>>;
+export async function getSetting<K extends SettingKey, D extends SettingKeyValueType<K>>(
+  db: Database,
+  key: K,
+  defaultValue?: D
+) {
+  const setting = await db.getSetting({ name: key });
+  return setting != null ? JSON.parse(setting) : defaultValue != undefined ? defaultValue : null;
+}
+
+export async function getSettings<K extends SettingKey>(
+  db: Database
+): Promise<{ [k in K]: SettingKeyValueType<K> | null }>;
+export async function getSettings<K extends SettingKey[]>(
+  db: Database,
+  keys: K
+): Promise<{ [k in K[number]]: SettingKeyValueType<k> | null }>;
+export async function getSettings<K extends SettingKey[]>(db: Database, keys?: K) {
+  const settings = await db.getSettings({ names: keys });
+
+  return settings.reduce(
+    (prev, curr) => Object.assign(prev, { [curr.name]: curr.value != null ? JSON.parse(curr.value) : null }),
+    {} as { [k in K[number]]: SettingKeyValueType<k> | null }
+  );
+}
+
+export enum SettingKey {
+  SignupEnabled = 'signup.enabled',
+  SignupDisabledMessage = 'signup.disabledMessage',
+  SignupDisabledSubMessage = 'signup.disabledSubMessage'
+}
+
+export type SettingKeyValueType<K extends SettingKey> = {
+  [SettingKey.SignupEnabled]: boolean;
+  [SettingKey.SignupDisabledMessage]: string;
+  [SettingKey.SignupDisabledSubMessage]: string;
+}[K];