ic-ctbu-backend/apis/Corn/ProxySelfIpEcho.js

const API = require('../../lib/API')
const { BaseStdResponse } = require('../../BaseStdResponse')

function getClientIp(req) {
    let ip = null
    if (req.headers['x-forwarded-for']) {
        ip = String(req.headers['x-forwarded-for']).split(',')[0].trim()
    } else if (req.headers['x-real-ip']) {
        ip = String(req.headers['x-real-ip']).trim()
    } else {
        ip = req.connection?.remoteAddress || req.socket?.remoteAddress || ''
    }

    if (String(ip).startsWith('::ffff:')) ip = String(ip).replace('::ffff:', '')
    return ip || '0.0.0.0'
}

class ProxySelfIpEcho extends API {
    constructor() {
        super()
        this.noEncrypt()
        this.setPath('/Corn/ProxySelfIpEcho')
        this.setMethod('GET')
    }

    async onRequest(req, res) {
        return res.json({
            ...BaseStdResponse.OK,
            data: {
                ip: getClientIp(req),
                x_forwarded_for: req.headers['x-forwarded-for'] || '',
                x_real_ip: req.headers['x-real-ip'] || '',
                remote_address: req.connection?.remoteAddress || req.socket?.remoteAddress || ''
            }
        })
    }
}

module.exports.ProxySelfIpEcho = ProxySelfIpEcho