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400 lines
10 KiB
400 lines
10 KiB
package proxy
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import (
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"context"
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"encoding/json"
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"fmt"
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"godo/libs"
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"godo/model"
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"net"
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"net/http"
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"net/http/httputil"
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"net/url"
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"strconv"
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"sync"
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"time"
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)
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// 全局代理服务映射
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var proxyServers sync.Map
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// ProxyServer 结构体用于存储服务类型和实际服务对象
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type ProxyServer struct {
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Type string
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Server interface{}
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}
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// FileServer 结构体用于存储文件静态服务的信息
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type FileServer struct {
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Port int
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Server *http.Server
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}
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// 创建 LocalProxy 的 HTTP 处理函数
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func CreateLocalProxyHandler(w http.ResponseWriter, r *http.Request) {
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var lp model.LocalProxy
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err := json.NewDecoder(r.Body).Decode(&lp)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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// 残留数据id 设置为 0
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lp.ID = 0
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err = model.Db.Create(&lp).Error
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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// 启动代理服务
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go startProxy(lp)
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libs.SuccessMsg(w, lp, "")
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}
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// GetLocalProxiesHandler 获取所有 LocalProxy 的 HTTP 处理函数
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func GetLocalProxiesHandler(w http.ResponseWriter, r *http.Request) {
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// 获取查询参数 page 和 limit
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pageStr := r.URL.Query().Get("page")
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limitStr := r.URL.Query().Get("limit")
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page, err := strconv.Atoi(pageStr)
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if err != nil || page < 1 {
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page = 1
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}
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limit, err := strconv.Atoi(limitStr)
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if err != nil || limit < 1 {
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limit = 10
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}
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// 定义响应结构体
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type ProxyResponse struct {
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Proxies []model.LocalProxy `json:"proxies"`
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Total int64 `json:"total"`
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}
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// 修改处理函数
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proxies, total, err := model.GetLocalProxies(page, limit)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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libs.SuccessMsg(w, ProxyResponse{Proxies: proxies, Total: total}, "")
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}
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// GetLocalProxyHandler 获取单个 LocalProxy 的 HTTP 处理函数
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func GetLocalProxyHandler(w http.ResponseWriter, r *http.Request) {
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idStr := r.URL.Query().Get("id")
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id, err := strconv.Atoi(idStr)
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if err != nil {
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http.Error(w, "Invalid ID", http.StatusBadRequest)
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return
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}
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var proxy model.LocalProxy
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err = model.Db.First(&proxy, uint(id)).Error
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if err != nil {
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http.Error(w, err.Error(), http.StatusNotFound)
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return
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}
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libs.SuccessMsg(w, proxy, "")
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}
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// UpdateLocalProxyHandler 更新 LocalProxy 的 HTTP 处理函数
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func UpdateLocalProxyHandler(w http.ResponseWriter, r *http.Request) {
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var lp model.LocalProxy
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err := json.NewDecoder(r.Body).Decode(&lp)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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if lp.ID == 0 {
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http.Error(w, "Invalid ID", http.StatusBadRequest)
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return
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}
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updata := map[string]interface{}{
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"port": lp.Port,
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"proxy_type": lp.ProxyType,
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"domain": lp.Domain,
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"status": lp.Status,
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"listen_port": lp.ListenPort,
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// path
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}
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err = model.Db.Model(&model.LocalProxy{}).Where("id = ?", lp.ID).Updates(updata).Error
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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// 停止旧的代理服务
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stopProxy(lp.ID)
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// 启动新的代理服务
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go startProxy(lp)
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libs.SuccessMsg(w, lp, "")
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}
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// DeleteLocalProxyHandler 删除 LocalProxy 的 HTTP 处理函数
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func DeleteLocalProxyHandler(w http.ResponseWriter, r *http.Request) {
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idStr := r.URL.Query().Get("id")
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id, err := strconv.Atoi(idStr)
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if err != nil {
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http.Error(w, "Invalid ID", http.StatusBadRequest)
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return
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}
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// 停止代理服务
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stopProxy(uint(id))
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err = model.Db.Delete(&model.LocalProxy{}, uint(id)).Error
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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libs.SuccessMsg(w, nil, "delete proxy success")
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}
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// HandlerSetProxyStatus 设置代理状态
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func HandlerSetProxyStatus(w http.ResponseWriter, r *http.Request) {
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idStr := r.URL.Query().Get("id")
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if idStr == "" {
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libs.ErrorMsg(w, "id is empty")
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return
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}
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id, err := strconv.Atoi(idStr)
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if err != nil || id == 0 {
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libs.ErrorMsg(w, "id is not number")
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return
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}
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var proxy model.LocalProxy
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if err := model.Db.First(&proxy, uint(id)).Error; err != nil {
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libs.ErrorMsg(w, "proxy not found")
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return
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}
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if err := model.Db.Model(&model.LocalProxy{}).Where("id = ?", proxy.ID).Update("status", !proxy.Status).Error; err != nil {
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libs.ErrorMsg(w, "update proxy status failed")
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return
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}
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if !proxy.Status {
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startProxy(proxy)
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} else {
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stopProxy(proxy.ID)
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}
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libs.SuccessMsg(w, nil, "")
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}
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// 初始化代理处理函数
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func InitProxyHandlers() {
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go InitFrpcServer()
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proxies, _, err := model.GetLocalProxies(1, 1000) // 获取所有代理配置
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if err != nil {
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fmt.Println("Failed to get local proxies:", err)
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return
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}
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for _, proxy := range proxies {
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go startProxy(proxy)
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}
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}
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// 启动代理服务
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func startProxy(proxy model.LocalProxy) {
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switch proxy.ProxyType {
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case "http":
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go func(p model.LocalProxy) {
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httpProxyHandler(p)
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}(proxy)
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case "udp":
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go func(p model.LocalProxy) {
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udpProxyHandler(p)
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}(proxy)
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case "file":
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go func(p model.LocalProxy) {
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fileServerHandler(p)
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}(proxy)
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default:
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fmt.Printf("Unknown proxy type: %s\n", proxy.ProxyType)
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}
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}
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// 停止代理服务
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func stopProxy(id uint) {
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if server, ok := proxyServers.Load(id); ok {
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proxyServer, ok := server.(ProxyServer)
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if !ok {
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fmt.Printf("Failed to load proxy server for ID %d\n", id)
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return
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}
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switch proxyServer.Type {
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case "http":
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httpServer, ok := proxyServer.Server.(*http.Server)
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if ok {
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// 创建一个上下文,用于传递给 server.Shutdown(ctx)
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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if err := httpServer.Shutdown(ctx); err != nil {
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fmt.Printf("Failed to shutdown HTTP server on port %s: %v\n", httpServer.Addr, err)
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} else {
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fmt.Printf("Stopped HTTP server on port %s\n", httpServer.Addr)
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}
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}
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case "udp":
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udpConn, ok := proxyServer.Server.(*net.UDPConn)
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if ok {
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udpConn.Close()
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fmt.Printf("Stopped UDP server on port %d\n", udpConn.LocalAddr().(*net.UDPAddr).Port)
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}
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case "file":
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fileServer, ok := proxyServer.Server.(*FileServer)
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if ok {
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// 创建一个上下文,用于传递给 server.Shutdown(ctx)
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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if err := fileServer.Server.Shutdown(ctx); err != nil {
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fmt.Printf("Failed to shutdown file server on port %d: %v\n", fileServer.Port, err)
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} else {
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fmt.Printf("Stopped file server on port %d\n", fileServer.Port)
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}
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}
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default:
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fmt.Printf("Unknown proxy type: %s\n", proxyServer.Type)
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}
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proxyServers.Delete(id)
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}
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}
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// HTTP 代理处理函数
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func httpProxyHandler(proxy model.LocalProxy) {
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// 如果 ListenPort 没有传递,默认为 80
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if proxy.ListenPort == 0 {
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proxy.ListenPort = 80
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}
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fmt.Printf("Initializing HTTP proxy for ID %d on domain %s and listen port %d\n", proxy.ID, proxy.Domain, proxy.ListenPort)
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// 使用 proxy.Port 作为本地目标端口
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remote, err := url.Parse(fmt.Sprintf("http://localhost:%d", proxy.Port))
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if err != nil {
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fmt.Printf("Failed to parse remote URL for port %d: %v\n", proxy.Port, err)
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return
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}
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fmt.Printf("Parsed remote URL: %s\n", remote.String())
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reverseProxy := httputil.NewSingleHostReverseProxy(remote)
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reverseProxy.Director = func(req *http.Request) {
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req.URL.Scheme = remote.Scheme
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req.URL.Host = remote.Host
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req.Host = remote.Host
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req.URL.Path = proxy.Path + req.URL.Path // 使用代理路径
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fmt.Printf("Proxying request to: %s\n", req.URL.String())
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}
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reverseProxy.ModifyResponse = func(resp *http.Response) error {
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fmt.Printf("Received response with status: %s\n", resp.Status)
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return nil
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}
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reverseProxy.ErrorHandler = func(rw http.ResponseWriter, req *http.Request, err error) {
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fmt.Printf("Error during proxying: %v\n", err)
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http.Error(rw, "Proxy error", http.StatusBadGateway)
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}
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// 监听配置中指定的域名和端口
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server := &http.Server{
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Addr: fmt.Sprintf(":%d", proxy.ListenPort),
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Handler: reverseProxy,
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}
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proxyServers.Store(proxy.ID, ProxyServer{Type: "http", Server: server})
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if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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fmt.Printf("Failed to start HTTP proxy on domain %s and listen port %d: %v\n", proxy.Domain, proxy.ListenPort, err)
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} else {
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fmt.Printf("HTTP proxy on domain %s and listen port %d started successfully\n", proxy.Domain, proxy.ListenPort)
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}
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}
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// UDP 代理处理函数
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func udpProxyHandler(proxy model.LocalProxy) {
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localAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf(":%d", proxy.Port))
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if err != nil {
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fmt.Printf("Failed to resolve local UDP address for port %d: %v\n", proxy.Port, err)
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return
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}
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remoteAddr, err := net.ResolveUDPAddr("udp", proxy.Domain)
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if err != nil {
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fmt.Printf("Failed to resolve remote UDP address for port %d: %v\n", proxy.Port, err)
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return
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}
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conn, err := net.ListenUDP("udp", localAddr)
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if err != nil {
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fmt.Printf("Failed to listen on UDP port %d: %v\n", proxy.Port, err)
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return
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}
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defer conn.Close()
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proxyServers.Store(proxy.ID, ProxyServer{Type: "udp", Server: conn})
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buffer := make([]byte, 1024)
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for {
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n, addr, err := conn.ReadFromUDP(buffer)
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if err != nil {
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fmt.Printf("Failed to read from UDP: %v\n", err)
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continue
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}
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remoteConn, err := net.DialUDP("udp", nil, remoteAddr)
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if err != nil {
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fmt.Printf("Failed to dial remote UDP: %v\n", err)
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continue
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}
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_, err = remoteConn.Write(buffer[:n])
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if err != nil {
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fmt.Printf("Failed to write to remote UDP: %v\n", err)
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continue
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}
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// 读取远程服务器的响应并转发回客户端
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n, err = remoteConn.Read(buffer)
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if err != nil {
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fmt.Printf("Failed to read from remote UDP: %v\n", err)
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continue
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}
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_, err = conn.WriteToUDP(buffer[:n], addr)
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if err != nil {
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fmt.Printf("Failed to write to client UDP: %v\n", err)
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continue
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}
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}
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}
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// 文件静态服务处理函数
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func fileServerHandler(proxy model.LocalProxy) {
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// 创建文件服务器的 HTTP 处理函数
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fileHandler := http.FileServer(http.Dir(proxy.Path))
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// 启动 HTTP 服务器并监听指定端口
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server := &http.Server{
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Addr: fmt.Sprintf(":%d", proxy.Port),
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Handler: fileHandler,
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}
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proxyServers.Store(proxy.ID, ProxyServer{Type: "file", Server: &FileServer{Port: int(proxy.Port), Server: server}})
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fmt.Printf("Starting file server on port %d serving files from %s\n", proxy.Port, proxy.Path)
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if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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fmt.Printf("Failed to start file server on port %d: %v\n", proxy.Port, err)
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}
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}
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