BiliRoaming Alibaba Cloud FC Node.js script

ali_fc_biliroaming.js

/**
 * @file BiliRoaming Alibaba Cloud FC Node.js script, need a layer with "axios"
 * @author thanksshu
 * @license MIT
 */

'use strict';
const axios = require('axios').default;

const TARGET_URL = 'https://api.bilibili.com';
const TIMEOUT = 5000; // ms

exports.handler = (req, resp, _) => {
    // log inbound request
    console.log({
        // 'headers': req.headers,
        'path': req.path,
        'queries': req.queries,
        'method': req.method,
        'referer': req.headers['referer'],
        'biliroaming': req.headers['x-from-biliroaming'],
        'ip': req.clientIP,
    });

    /* check request url */
    // web? y-> pass
    //      n-> app? y-> header? y-> pass
    //               n-> 404     n-> 403
    if (req.path !== '/pgc/player/web/playurl') {
        if (req.path !== '/pgc/player/api/playurl') {
            console.log('Not found');
            resp.setStatusCode(404);
            resp.send('Not found');
            return;
        } else if (req.headers['x-from-biliroaming'] === undefined) {
            console.log('Forbidden');
            resp.setStatusCode(403);
            resp.send('Forbidden');
            return;
        }
    }

    /* send proxy request */
    // remove some headers
    const { 'host': _host, 'referer': _referer, 'user-agent': _userAgent, ...headers } = req.headers;
    axios.request({
        method: req.method,
        url: TARGET_URL + req.path,
        headers: headers,
        params: req.queries,
        data: req.body,
        timeout: TIMEOUT,
    }).then((response) => {
        // log proxy response
        console.log({
            // 'headers': response.headers,
            'status': response.status,
            'data': response.data,
        });

        resp.setStatusCode(response.status);
        // remove access-control-allow-credentials header which causes strange problems
        const { 'access-control-allow-credentials': _aCAC, ...respHeaders } = response.headers
        for (const key in respHeaders) {
            resp.setHeader(key, respHeaders[key]);
        }
        resp.send(JSON.stringify(response.data));
    }).catch((error) => {
        console.log(error);
        resp.setStatusCode(502);
        resp.send("Upstream error");
    });
}