migrate to typescript

src/utils/getIP.ts

@@ -0,0 +1,19 @@
+import {config} from '../config';
+import {Request} from 'express';
+
+export function getIP(req: Request): string {
+    if (config.behindProxy === true || config.behindProxy === "true") {
+        config.behindProxy = "X-Forwarded-For";
+    }
+
+    switch (config.behindProxy as string) {
+        case "X-Forwarded-For":
+            return req.headers['x-forwarded-for'] as string;
+        case "Cloudflare":
+            return req.headers['cf-connecting-ip'] as string;
+        case "X-Real-IP":
+            return req.headers['x-real-ip'] as string;
+        default:
+            return req.connection.remoteAddress;
+    }
+}