CloudFlare-ImgBed/functions/api/fetchRes.js

/**
 * 远程资源代理读取 API
 * 负责在鉴权后拉取请求体中指定 URL 的资源并透传响应内容
 */
import { dualAuthCheck } from '../utils/auth/dualAuth.js';

export async function onRequest(context) {
    // 获取请求体中URL的内容
    const {
        request,
        env,
        params,
        waitUntil,
        next,
        data
    } = context;

    // 双重鉴权检查
    const url = new URL(request.url);
    const { authorized } = await dualAuthCheck(env, url, request);
    if (!authorized) {
        return new Response(JSON.stringify({ error: 'Unauthorized' }), {
            status: 401,
            headers: { 'Content-Type': 'application/json' }
        });
    }

    const jsonRequest = await request.json();
    const targetUrl = jsonRequest.url;
    if (targetUrl === undefined) {
        return new Response('URL is required', { status: 400 })
    }
    const response = await fetch(targetUrl);
    const headers = new Headers(response.headers);
    return new Response(response.body, {
        headers: headers
    })
}