1.3.0 (#6)

src/config.ts

@@ -0,0 +1,50 @@
+import { config } from 'dotenv'
+import { validate } from 'node-cron'
+
+config()
+
+function getEnv(key: string, fallback: string, parse?: undefined, validator?: (s: string) => boolean): string
+function getEnv<T>(key: string, fallback: T, parse: (value: string) => T, validator?: (T: string) => boolean): T
+function getEnv<T>(
+  key: string,
+  fallback: T,
+  parse?: (value: string) => T,
+  validator?: (s: string | T) => boolean
+): T | string {
+  const value = process.env[key]
+  const parsed = value === undefined ? fallback : parse ? parse(value) : value
+  if (validator && !validator(parsed)) {
+    console.error(`Invalid or missing value for ${key}: ${value}`)
+    process.exit(1)
+  }
+  return parsed
+}
+
+function parseBoolean(value: string): boolean {
+  value = value.toLowerCase()
+  const truthy = ['true', 'yes', '1']
+  return truthy.includes(value)
+}
+
+function isPresent(s: string): boolean {
+  return s.length > 0
+}
+
+export const Config = {
+  version: getEnv('npm_package_version', 'unknown'),
+  logging: {
+    level: getEnv('LOG_LEVEL', 'info'),
+  },
+  auth: {
+    token: getEnv('TOKEN', '', undefined, isPresent),
+  },
+  dns: {
+    zone: getEnv('ZONE', '', undefined, isPresent),
+    record: getEnv('DNS_RECORD', '', undefined, isPresent),
+    proxied: getEnv('PROXIED', false, parseBoolean),
+  },
+  runner: {
+    cron: getEnv('CRON', '*/5 * * * *', undefined, (s) => validate(s)),
+    resolver: getEnv('RESOLVER', 'https://api.ipify.org'),
+  },
+}