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package proxy
import (
"context"
"encoding/json"
"errors"
"fmt"
"godo/libs"
"godo/model"
"log"
"net"
"net/http"
"net/http/httputil"
"net/url"
"os"
"strconv"
"sync"
"time"
)
// 全局代理服务映射
var proxyServers sync.Map
// ProxyServer 结构体用于存储服务类型和实际服务对象
type ProxyServer struct {
Type string
Server interface{}
}
// FileServer 结构体用于存储文件静态服务的信息
type FileServer struct {
Port int
Server *http.Server
}
// 创建 LocalProxy 的 HTTP 处理函数
func CreateLocalProxyHandler(w http.ResponseWriter, r *http.Request) {
var lp model.LocalProxy
err := json.NewDecoder(r.Body).Decode(&lp)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
// 残留数据id 设置为 0
lp.ID = 0
err = model.Db.Create(&lp).Error
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// 启动代理服务
go startProxy(lp)
libs.SuccessMsg(w, lp, "")
}
// GetLocalProxiesHandler 获取所有 LocalProxy 的 HTTP 处理函数
func GetLocalProxiesHandler(w http.ResponseWriter, r *http.Request) {
// 获取查询参数 page 和 limit
pageStr := r.URL.Query().Get("page")
limitStr := r.URL.Query().Get("limit")
page, err := strconv.Atoi(pageStr)
if err != nil || page < 1 {
page = 1
}
limit, err := strconv.Atoi(limitStr)
if err != nil || limit < 1 {
limit = 10
}
// 定义响应结构体
type ProxyResponse struct {
Proxies []model.LocalProxy `json:"proxies"`
Total int64 `json:"total"`
}
// 修改处理函数
proxies, total, err := model.GetLocalProxies(page, limit)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
libs.SuccessMsg(w, ProxyResponse{Proxies: proxies, Total: total}, "")
}
// GetLocalProxyHandler 获取单个 LocalProxy 的 HTTP 处理函数
func GetLocalProxyHandler(w http.ResponseWriter, r *http.Request) {
idStr := r.URL.Query().Get("id")
id, err := strconv.Atoi(idStr)
if err != nil {
http.Error(w, "Invalid ID", http.StatusBadRequest)
return
}
var proxy model.LocalProxy
err = model.Db.First(&proxy, uint(id)).Error
if err != nil {
http.Error(w, err.Error(), http.StatusNotFound)
return
}
libs.SuccessMsg(w, proxy, "")
}
// UpdateLocalProxyHandler 更新 LocalProxy 的 HTTP 处理函数
func UpdateLocalProxyHandler(w http.ResponseWriter, r *http.Request) {
var lp model.LocalProxy
err := json.NewDecoder(r.Body).Decode(&lp)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if lp.ID == 0 {
http.Error(w, "Invalid ID", http.StatusBadRequest)
return
}
updata := map[string]interface{}{
"port": lp.Port,
"proxy_type": lp.ProxyType,
"domain": lp.Domain,
"status": lp.Status,
// path
}
err = model.Db.Model(&model.LocalProxy{}).Where("id = ?", lp.ID).Updates(updata).Error
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// 停止旧的代理服务
stopProxy(lp.ID)
if !lp.Status {
// 启动新的代理服务
go startProxy(lp)
}
libs.SuccessMsg(w, lp, "")
}
// DeleteLocalProxyHandler 删除 LocalProxy 的 HTTP 处理函数
func DeleteLocalProxyHandler(w http.ResponseWriter, r *http.Request) {
idStr := r.URL.Query().Get("id")
id, err := strconv.Atoi(idStr)
if err != nil {
http.Error(w, "Invalid ID", http.StatusBadRequest)
return
}
// 停止代理服务
stopProxy(uint(id))
err = model.Db.Delete(&model.LocalProxy{}, uint(id)).Error
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
libs.SuccessMsg(w, nil, "delete proxy success")
}
// HandlerSetProxyStatus 设置代理状态
func HandlerSetProxyStatus(w http.ResponseWriter, r *http.Request) {
idStr := r.URL.Query().Get("id")
if idStr == "" {
libs.ErrorMsg(w, "id is empty")
return
}
id, err := strconv.Atoi(idStr)
if err != nil || id == 0 {
libs.ErrorMsg(w, "id is not number")
return
}
var proxy model.LocalProxy
if err := model.Db.First(&proxy, uint(id)).Error; err != nil {
libs.ErrorMsg(w, "proxy not found")
return
}
if err := model.Db.Model(&model.LocalProxy{}).Where("id = ?", proxy.ID).Update("status", !proxy.Status).Error; err != nil {
libs.ErrorMsg(w, "update proxy status failed")
return
}
if !proxy.Status {
startProxy(proxy)
} else {
stopProxy(proxy.ID)
}
libs.SuccessMsg(w, nil, "")
}
// 初始化代理处理函数
func InitProxyHandlers() {
go InitFrpcServer()
proxies, _, err := model.GetLocalProxies(1, 1000) // 获取所有代理配置
if err != nil {
fmt.Println("Failed to get local proxies:", err)
return
}
for _, proxy := range proxies {
go startProxy(proxy)
}
}
// 启动代理服务
func startProxy(proxy model.LocalProxy) {
switch proxy.ProxyType {
case "http":
go func(p model.LocalProxy) {
httpProxyHandler(p)
}(proxy)
case "udp":
go func(p model.LocalProxy) {
udpProxyHandler(p)
}(proxy)
case "file":
go func(p model.LocalProxy) {
fileServerHandler(p)
}(proxy)
default:
fmt.Printf("Unknown proxy type: %s\n", proxy.ProxyType)
}
}
// 停止代理服务
func stopProxy(id uint) {
if server, ok := proxyServers.Load(id); ok {
proxyServer, ok := server.(ProxyServer)
if !ok {
fmt.Printf("Failed to load proxy server for ID %d\n", id)
return
}
switch proxyServer.Type {
case "http":
fmt.Println("closing http proxy...")
httpServer, ok := proxyServer.Server.(*http.Server)
if ok {
// 创建一个上下文,用于传递给 server.Shutdown(ctx)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
defer httpServer.Close()
if err := httpServer.Shutdown(ctx); err != nil {
fmt.Printf("Failed to shutdown HTTP server on port %s: %v\n", httpServer.Addr, err)
} else {
fmt.Printf("Stopped HTTP server on port %s\n", httpServer.Addr)
}
}
case "udp":
udpConn, ok := proxyServer.Server.(*net.UDPConn)
if ok {
udpConn.Close()
fmt.Printf("Stopped UDP server on port %d\n", udpConn.LocalAddr().(*net.UDPAddr).Port)
}
case "file":
fileServer, ok := proxyServer.Server.(*FileServer)
if ok {
// 创建一个上下文,用于传递给 server.Shutdown(ctx)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err := fileServer.Server.Shutdown(ctx); err != nil {
fmt.Printf("Failed to shutdown file server on port %d: %v\n", fileServer.Port, err)
} else {
fmt.Printf("Stopped file server on port %d\n", fileServer.Port)
}
}
default:
fmt.Printf("Unknown proxy type: %s\n", proxyServer.Type)
}
proxyServers.Delete(id)
}
}
// HTTP 代理处理函数
func httpProxyHandler(proxy model.LocalProxy) {
remote, err := url.Parse(proxy.Domain)
if err != nil {
fmt.Printf("Failed to parse remote URL for port %d: %v\n", proxy.Port, err)
return
}
if remote.Scheme == "" {
fmt.Printf("Remote URL for port %d does not contain a scheme (http/https): %s\n", proxy.Port, proxy.Domain)
return
}
// 创建反向代理
reverseProxy := httputil.NewSingleHostReverseProxy(remote)
// 设置请求头(如需要可以启用)
reverseProxy.Director = func(req *http.Request) {
req.Header.Set("X-Forwarded-Host", req.Host)
req.Header.Set("X-Origin-Host", remote.Host)
req.Header.Set("User-Agent", "Mozilla/5.0 (compatible; curl/7.68.0)") // 设置常见的 User-Agent
req.Host = remote.Host
req.URL.Scheme = remote.Scheme
req.URL.Host = remote.Host
}
reverseProxy.ErrorLog = log.New(os.Stderr, "proxy-debug: ", log.LstdFlags)
// 启动 HTTP 服务器并监听指定端口
bindAddress := "127.0.0.1"
serverAddr := fmt.Sprintf("%s:%d", bindAddress, proxy.Port)
server := &http.Server{
Addr: serverAddr,
Handler: reverseProxy,
}
proxyServers.Store(proxy.ID, ProxyServer{Type: "http", Server: server})
fmt.Printf("Starting HTTP proxy on LocalHost port %d and forwarding to %s \n", proxy.Port, proxy.Domain)
if err := server.ListenAndServe(); err != nil {
if errors.Is(err, http.ErrServerClosed) {
fmt.Printf("HTTP proxy on port %d stopped gracefully.\n", proxy.Port)
} else {
fmt.Printf("Error starting HTTP proxy on port %d: %v\n", proxy.Port, err)
}
}
}
// UDP 代理处理函数
func udpProxyHandler(proxy model.LocalProxy) {
localAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf(":%d", proxy.Port))
if err != nil {
fmt.Printf("Failed to resolve local UDP address for port %d: %v\n", proxy.Port, err)
return
}
remoteAddr, err := net.ResolveUDPAddr("udp", proxy.Domain)
if err != nil {
fmt.Printf("Failed to resolve remote UDP address for port %d: %v\n", proxy.Port, err)
return
}
conn, err := net.ListenUDP("udp", localAddr)
if err != nil {
fmt.Printf("Failed to listen on UDP port %d: %v\n", proxy.Port, err)
return
}
defer conn.Close()
proxyServers.Store(proxy.ID, ProxyServer{Type: "udp", Server: conn})
buffer := make([]byte, 1024)
for {
n, addr, err := conn.ReadFromUDP(buffer)
if err != nil {
fmt.Printf("Failed to read from UDP: %v\n", err)
continue
}
remoteConn, err := net.DialUDP("udp", nil, remoteAddr)
if err != nil {
fmt.Printf("Failed to dial remote UDP: %v\n", err)
continue
}
_, err = remoteConn.Write(buffer[:n])
if err != nil {
fmt.Printf("Failed to write to remote UDP: %v\n", err)
continue
}
// 读取远程服务器的响应并转发回客户端
n, err = remoteConn.Read(buffer)
if err != nil {
fmt.Printf("Failed to read from remote UDP: %v\n", err)
continue
}
_, err = conn.WriteToUDP(buffer[:n], addr)
if err != nil {
fmt.Printf("Failed to write to client UDP: %v\n", err)
continue
}
}
}
// 文件静态服务处理函数
func fileServerHandler(proxy model.LocalProxy) {
// 创建文件服务器的 HTTP 处理函数
fileHandler := http.FileServer(http.Dir(proxy.Path))
// 启动 HTTP 服务器并监听指定端口
server := &http.Server{
Addr: fmt.Sprintf(":%d", proxy.Port),
Handler: fileHandler,
}
proxyServers.Store(proxy.ID, ProxyServer{Type: "file", Server: &FileServer{Port: int(proxy.Port), Server: server}})
fmt.Printf("Starting file server on port %d serving files from %s\n", proxy.Port, proxy.Path)
if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
fmt.Printf("Failed to start file server on port %d: %v\n", proxy.Port, err)
}
}