Init the ddns service, create app, aws and ip modules

src/config/configuration.ts

@@ -0,0 +1,25 @@
+import * as Joi from 'joi';
+
+export function configuration() {
+  return {
+    aws: {
+      region: process.env.AWS_REGION,
+      accessKeyId: process.env.AWS_ACCESS_KEY_ID,
+      secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
+    },
+    port: process.env.PORT,
+    cron: process.env.CRON,
+    recordName: process.env.RECORD_NAME,
+    hostedZoneId: process.env.HOSTED_ZONE_ID,
+  };
+}
+
+export const validationSchema = Joi.object({
+  AWS_REGION: Joi.string().default('eu-west-2'),
+  AWS_ACCESS_KEY_ID: Joi.string().required(),
+  AWS_SECRET_ACCESS_KEY: Joi.string().required(),
+  PORT: Joi.number().port().default(3000),
+  CRON: Joi.string().required(),
+  RECORD_NAME: Joi.string().required(),
+  HOSTED_ZONE_ID: Joi.string().required(),
+});