refactor(rest): separate functions into diff files (#685)

* shtufffff

* fixe rate limit path infinite loop

* refactor

* ID > id

* Update process_request_headers.ts

* file names

Co-authored-by: ITOH <72305210+itohatweb@users.noreply.github.com>
Co-authored-by: ayntee <ayyantee@gmail.com>

src/rest/check_rate_limits.ts

@@ -0,0 +1,17 @@
+import { rest } from "./rest.ts";
+
+/** Check the rate limits for a url or a bucket. */
+export function checkRateLimits(url: string) {
+  const ratelimited = rest.ratelimitedPaths.get(url);
+  const global = rest.ratelimitedPaths.get("global");
+  const now = Date.now();
+
+  if (ratelimited && now < ratelimited.resetTimestamp) {
+    return ratelimited.resetTimestamp - now;
+  }
+  if (global && now < global.resetTimestamp) {
+    return global.resetTimestamp - now;
+  }
+
+  return false;
+}