discordeno/src/rest/create_request_body.ts

import { USER_AGENT } from "../util/constants.ts";

/** 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.toUpperCase() === "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,
  };
}