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/create_request_body.ts

@@ -0,0 +1,46 @@
+/** Creates the request body and headers that are necessary to send a request. Will handle different types of methods and everything necessary for discord. */
+export function createRequestBody(queuedRequest: QueuedRequest) {
+  const headers: { [key: string]: string } = {
+    Authorization: `Bot ${queuedRequest.options.token}`,
+    "User-Agent": USER_AGENT,
+  };
+
+  // GET METHODS SHOULD NOT HAVE A BODY
+  if (queuedRequest.request.method === "GET") {
+    queuedRequest.payload.body = undefined;
+  }
+
+  // IF A REASON IS PROVIDED ENCODE IT IN HEADERS
+  if (queuedRequest.payload.body?.reason) {
+    headers["X-Audit-Log-Reason"] = encodeURIComponent(
+      queuedRequest.payload.body.reason,
+    );
+  }
+
+  // IF A FILE/ATTACHMENT IS PRESENT WE NEED SPECIAL HANDLING
+  if (queuedRequest.payload.body?.file) {
+    const form = new FormData();
+    form.append(
+      "file",
+      queuedRequest.payload.body.file.blob,
+      queuedRequest.payload.body.file.name,
+    );
+    form.append(
+      "payload_json",
+      JSON.stringify({ ...queuedRequest.payload.body, file: undefined }),
+    );
+    queuedRequest.payload.body.file = form;
+  } else if (
+    queuedRequest.payload.body &&
+    !["GET", "DELETE"].includes(queuedRequest.request.method)
+  ) {
+    headers["Content-Type"] = "application/json";
+  }
+
+  return {
+    headers,
+    body: queuedRequest.payload.body?.file ||
+      JSON.stringify(queuedRequest.payload.body),
+    method: queuedRequest.request.method,
+  };
+}