seyfert/vendor/rest/createRequestBody.ts

import { RestManager } from "./restManager.ts";
import { FileContent } from "../types/shared.ts";
import { USER_AGENT } from "../util/constants.ts";
import { RequestMethod, RestPayload, RestRequest } from "./rest.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(rest: RestManager, queuedRequest: { request: RestRequest; payload: RestPayload }) {
export function createRequestBody(rest: RestManager, options: CreateRequestBodyOptions) {
    const headers: Record<string, string> = {
        "user-agent": USER_AGENT,
    };

    if (!options.unauthorized) headers["authorization"] = `Bot ${rest.token}`;

    // SOMETIMES SPECIAL HEADERS (E.G. CUSTOM AUTHORIZATION) NEED TO BE USED
    if (options.headers) {
        for (const key in options.headers) {
            headers[key.toLowerCase()] = options.headers[key];
        }
    }

    // GET METHODS SHOULD NOT HAVE A BODY
    if (options.method === "GET") {
        options.body = undefined;
    }

    // IF A REASON IS PROVIDED ENCODE IT IN HEADERS
    if (options.body?.reason) {
        headers["X-Audit-Log-Reason"] = encodeURIComponent(options.body.reason as string);
        options.body.reason = undefined;
    }

    // IF A FILE/ATTACHMENT IS PRESENT WE NEED SPECIAL HANDLING
    if (options.body?.file) {
        if (!Array.isArray(options.body.file)) {
            options.body.file = [options.body.file];
        }

        const form = new FormData();

        for (let i = 0; i < (options.body.file as FileContent[]).length; i++) {
            form.append(
                `file${i}`,
                (options.body.file as FileContent[])[i].blob,
                (options.body.file as FileContent[])[i].name,
            );
        }

        form.append("payload_json", JSON.stringify({ ...options.body, file: undefined }));
        options.body.file = form;
    } else if (options.body && !["GET", "DELETE"].includes(options.method)) {
        headers["Content-Type"] = "application/json";
    }

    return {
        headers,
        body: (options.body?.file ?? JSON.stringify(options.body)) as FormData | string,
        method: options.method,
    };
}

export interface CreateRequestBodyOptions {
    headers?: Record<string, string>;
    method: RequestMethod;
    body?: Record<string, unknown>;
    unauthorized?: boolean;
}