Minecraft 认证服务器代理

针对国内网络环境对Minecraft的认证服务的污染问题做出的代理解决方案，常见的报错包括：Authentication servers are down. Please try again later, sorry!、[10:20:18] [User Authenticator #2/ERROR]: Couldn't verify username because servers are unavailable等。

基本原理与解决方案

说人话就是在国内Mojang和托管在Azure上的部分服务被墙了导致国内大概率访问不到这些API，于是通过Cloudflare Workers进行代理。这里假设已经配置好了，域名为minecraft-service.lxn.worker.dev，相关的worker.js放在文章末尾了。

用法

示例：

java -Xmx20G \
  -Dminecraft.api.auth.host=https://minecraft-service.lxn.worker.dev/auth \
  -Dminecraft.api.account.host=https://minecraft-service.lxn.worker.dev/account \
  -Dminecraft.api.session.host=https://minecraft-service.lxn.worker.dev/session \
  -Dminecraft.api.services.host=https://minecraft-service.lxn.worker.dev/service \
  -jar fabric-server-mc.1.21.1-loader.0.18.4-launcher.1.1.1.jar nogui

注意-D指定的参数一定要在-jar之前否则不生效或者传不到。

Worker.js

该js基于 Fallen_Breath的动态 改进而来。

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})

const PATH_MAP = {
  '/auth': 'authserver.mojang.com',
  '/account': 'api.mojang.com',
  '/session': 'sessionserver.mojang.com',
  '/services': 'api.minecraftservices.com',
  '/service': 'api.minecraftservices.com',
  '/minecraft': 'api.minecraftservices.com'
}

async function handleRequest(request) {
  let url = new URL(request.url)

  if (url.pathname.startsWith('/mcauthproxy/')) {
    url.pathname = url.pathname.replace('/mcauthproxy', '')
  }

  if (url.pathname === '/' || url.pathname === '' || url.pathname === '/favicon.ico') {
    return new Response(
      'Minecraft Proxy by lxnchan.cn, Service OK.',
      { status: 200 }
    )
  }

  let isMatched = false

  for (let prefix in PATH_MAP) {
    if (
      url.pathname === prefix ||
      url.pathname.startsWith(prefix + '/')
    ) {
      url.hostname = PATH_MAP[prefix]
      url.pathname = url.pathname.replace(prefix, '')
      isMatched = true
      break
    }
  }

  if (!isMatched) {
    return new Response(
      'API Not Found, path: ' + url.pathname,
      { status: 404 }
    )
  }

  let headers = new Headers(request.headers)
  headers.set('Host', url.hostname)

  console.log(`Proxy ${request.url} -> ${url.toString()}`)

  let modifiedRequest = new Request(url.toString(), {
    method: request.method,
    headers: headers,
    body: ['GET', 'HEAD'].includes(request.method)
      ? undefined
      : request.body
  })

  let response = await fetch(modifiedRequest)

  return new Response(response.body, {
    status: response.status,
    statusText: response.statusText,
    headers: response.headers
  })
}