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proxy.js
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proxy.js
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/**
* cfworker反向代理工具
* reference: https://developer.mozilla.org/zh-CN/docs/Web/API/URL
*/
addEventListener('fetch', event => {
event.respondWith(handleRequest(event.request))
})
/**
* Respond to the request
* @param {Request} request
*/
async function handleRequest(request) {
//获取服务器hostname,Protocol,Port
let srvurl=new URL(request.url);
let srvHostname = srvurl.hostname;
let srvHost = srvurl.host;
let reqHostname = null;
let reqProtocol = null;
let reqPort = null;
let reqReferer = null;
let reqRefererd = null;
let refHost = null;
let havereqPort = true;
let enableReferRewrite = true;
let enableUrlRewrite = false;
let enableCookieRewrite = true;
//取域名第一个斜杠后的所有信息为代理链接
let url = request.url.substr(8);
url = url.substr(url.indexOf('/') + 1);
//返回对象
var response;
//需要忽略的代理
if (request.method == "OPTIONS" || url.length == 0 || url == "favicon.ico" || url == "robots.txt") {
//输出提示
var htm = [];
var htmHeaders = new Headers;
htmHeaders.set("content-type", "text/html");
htm.push("<html><body>");
htm.push("<h1>404 Page Not Found</h1>");
htm.push("Request file not found on this server.");
htm.push("<hr>");
htm.push("HTTP Server at tc.0110.inaddr Port 8080");
htm.push("</body></html>");
response = new Response(htm.join('\n\n'), {
status: 404,
headers: htmHeaders,
});
} else {
//补上前缀 https://
if (url.toLowerCase().indexOf("http") == -1) {
url = "https://" + url;
}
const requrl = new URL(url);
//获取目标host
reqHostname = requrl.hostname;
//获取protocol
reqProtocol = requrl.protocol;
//获取port，没有就设置默认port
reqPort = requrl.port;
if (reqPort === "") {
havereqPort = false;
if (reqProtocol === "http:") {
reqPort = "80";
}
if (reqProtocol === "https:") {
reqPort = "443";
}
requrl.port = reqPort;
}
//处理Upgrade请求（websocket）
var reqHeaders = new Headers(request.headers);
let connectionType = reqHeaders.get('Connection');
if (connectionType === 'Upgrade')
{
let uprequest=new Request(requrl,request);
return fetch(uprequest);
}
//获取referer中的Host信息。reference: https://developer.mozilla.org/zh-CN/docs/Web/API/URL/host
reqReferer = reqHeaders.get('Referer');
if (reqReferer != null) {
const reqRefererUrla = new URL(reqReferer);
refHost = reqRefererUrla.host;
} else {
refHost = srvHostname+':'+reqPort;
}
//改写referer，复原请求原本的referer
if (enableReferRewrite == true) {
if (reqReferer !== null) {
reqReferer = reqReferer.substr(8);
reqReferer = reqReferer.substr(reqReferer.indexOf('/') + 1);
if (reqReferer.toLowerCase().indexOf("http") == -1) {
reqReferer = "https://" + reqReferer;
}
reqHeaders.set('Referer', reqReferer);
//console.log(reqReferer);
} else {
reqReferer="";
}
}
//重写cookie路径和域
const send_cookie = reqHeaders.get('cookie');
if (send_cookie !== null &&
enableCookieRewrite == true) {
let text = send_cookie.replace(new RegExp("Path=/"+reqHostname+'/', 'g'), "Path=/");
text = text.replace(new RegExp("Domain="+srvHostname, 'g'), "Domain="+reqHostname);
reqHeaders.set('cookie', text);
}
//跟踪跳转 ref: https://developers.cloudflare.com/workers/runtime-apis/request#requestinit
const reqInit = {
'method': request.method,
'headers': reqHeaders,
'redirect': 'follow',
}
//当连接为POST或PUT时，需要传递body
if (request.method === 'POST' ||
request.method === 'PUT'
) {
reqInit.body = request.body
}
//发起 fetch
response = await fetch(requrl, reqInit);
//跳转相对路径到正确的地址，原理为从referer中获取域名，拼接之后301跳转
if (reqReferer != "") {
if (response.status==530 || response.status==502 || (response.status==403 && response.statusText=="Forbidden")) {
const reqRefererUrl = new URL(reqReferer);
reqHostname = reqRefererUrl.hostname;
console.log(requrl.hostname)
let re = new RegExp('https://', 'g');
let j = 'https://'+refHost+'/'+reqHostname+'/';
realurl = requrl.href.replace(re, j);
return Response.redirect(realurl, 301);
}
}
}
//添加跨域头
var myHeaders = new Headers(response.headers);
myHeaders.set("Access-Control-Allow-Origin", "*");
myHeaders.set("Access-Control-Allow-Methods", "GET, PUT, PATCH, POST, DELETE");
myHeaders.set("Access-Control-Allow-Headers", "*");
myHeaders.set('access-control-allow-credentials', true);
myHeaders.delete('content-security-policy');
myHeaders.delete('content-security-policy-report-only');
myHeaders.delete('clear-site-data');
//重写返回链接
let response_clone = response.clone();
let original_text = null;
var i, j;
if (havereqPort === true) {
reqHostname = reqHostname+":"+reqPort;
}
//替换html链接
const replace_html = {
'href="/': 'href="/'+reqHostname+'/',
'href="https://': 'href="https://'+srvHost+'/',
'href="http://': 'href="https://'+srvHost+'/http://',
'src="//': 'src="'+reqProtocol+'//',
'src="/': 'src="'+reqProtocol+'//'+reqHostname+'/',
'srcset="/': 'srcset="/'+reqHostname+'/',
'src="https://': 'src="https://'+srvHost+'/',
'src="http://': 'src="https://'+srvHost+'/http://',
'content="https://': 'content="https://'+srvHost+'/',
'content="//': 'content="'+reqProtocol+'//',
'content="/': 'content="/'+reqHostname+'/',
'url[(]https://': 'url(https://'+srvHost+'/',
'url[(]"/': 'url("/'+reqHostname+'/',
'url[(]/': 'url(/'+reqHostname+'/',
"src='//": "src='//"+srvHost+'/',
"src='/": "src='/"+reqHostname+'/',
"u='/xjs/": "u='/"+reqHostname+"/xjs/",
"var s='/": "var s='/"+reqHostname+"/",
}
const replace_css = {
'url[(]"/': 'url("/'+reqHostname+'/',
//'url[(]https://': 'url(https://'+reqHostname+'/',
'https://': 'https://'+srvHostname+'/',
'http://': 'https://'+srvHostname+'/http://',
}
const replace_js = {
"src='//": "src='//"+srvHostname+'/',
"src='/": "src='/"+reqHostname+'/',
'https://': 'https://'+srvHostname+'/',
'http://': 'https://'+srvHostname+'/http://',
}
//判断能否替换
const content_type = myHeaders.get('content-type');
if (content_type !== null &&
enableUrlRewrite == true) {
let text = await response_clone.text();
if (content_type.includes('text/html'))
{
for (i in replace_html) {
j = replace_html[i]
let re = new RegExp(i, 'g')
text = text.replace(re, j);
}
}
if (content_type.includes('-text/javascript'))
{
for (i in replace_js) {
j = replace_js[i]
let re = new RegExp(i, 'g')
text = text.replace(re, j);
}
}
if (content_type.includes('-text/css'))
{
for (i in replace_css) {
j = replace_css[i]
let re = new RegExp(i, 'g')
text = text.replace(re, j);
}
}
original_text = text;
} else {
original_text = response.body;
}
//替换cookie，支持登陆
const set_cookie = myHeaders.get('set-cookie');
if (set_cookie !== null &&
enableCookieRewrite == true) {
let text = set_cookie.replace(RegExp("Path=/", 'g'), "Path=/"+reqHostname+'/');
text = text.replace(RegExp("Domain="+reqHostname, 'g'), "Domain="+srvHostname);
myHeaders.set('set-cookie', text);
}
return new Response(original_text, {
status: response.status,
headers: myHeaders
})
return myresponse;
}