feat(api): validate configuration

src/config/config.module.ts

@@ -0,0 +1,40 @@
+import * as Joi from "@hapi/joi";
+import { Module } from "@nestjs/common";
+import {
+  ConfigModule as NestConfigModule,
+  ConfigService,
+} from "@nestjs/config";
+
+@Module({
+  imports: [
+    NestConfigModule.forRoot({
+      isGlobal: true,
+      validationSchema: Joi.object({
+        // Application
+        NODE_ENV: Joi.string().valid("dev", "production").default("dev"),
+        PORT: Joi.number().default(3000),
+        APP_URL: Joi.string().default("http://localhost:3000"),
+
+        // JWT
+        JWT_SECRET: Joi.string().required(),
+        JWT_EXPIRATION_TIME: Joi.string().default("1d"),
+
+        // Spotify
+        SPOTIFY_CLIENT_ID: Joi.string().required(),
+        SPOTIFY_CLIENT_SECRET: Joi.string().required(),
+        SPOTIFY_FETCH_INTERVAL_MS: Joi.number().default(5 * 60 * 1000),
+        SPOTIFY_WEB_API_URL: Joi.string().default("https://api.spotify.com/"),
+        SPOTIFY_AUTH_API_URL: Joi.string().default(
+          "https://accounts.spotify.com/"
+        ),
+
+        // DB
+        DB_HOST: Joi.string().required(),
+        DB_USERNAME: Joi.string().required(),
+        DB_PASSWORD: Joi.string().required(),
+        DB_DATABASE: Joi.string().required(),
+      }),
+    }),
+  ],
+})
+export class ConfigModule {}