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package proxy
import (
"encoding/json"
"fmt"
"godo/model"
"net"
"net/http"
"net/http/httputil"
"net/url"
"strconv"
)
// 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
}
err = model.Db.Create(&lp).Error
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusCreated)
json.NewEncoder(w).Encode(lp)
}
// GetLocalProxiesHandler 获取所有 LocalProxy 的 HTTP 处理函数
func GetLocalProxiesHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
// 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
}
w.Header().Set("Content-Type", "application/json")
response := ProxyResponse{
Proxies: proxies,
Total: total,
}
if err := json.NewEncoder(w).Encode(response); err != nil {
http.Error(w, "Failed to encode response", http.StatusInternalServerError)
return
}
}
// 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
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(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
}
err = model.Db.Model(&model.LocalProxy{}).Where("id = ?", lp.ID).Updates(lp).Error
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusOK)
json.NewEncoder(w).Encode(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
}
err = model.Db.Delete(&model.LocalProxy{}, uint(id)).Error
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusNoContent)
}
// 初始化代理处理函数
func InitProxyHandlers() {
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 {
switch proxy.ProxyType {
case "http":
go func(p model.LocalProxy) {
httpProxyHandler(p)
}(proxy)
case "udp":
// UDP 转发的处理逻辑
go func(p model.LocalProxy) {
udpProxyHandler(p)
}(proxy)
case "file":
http.Handle(fmt.Sprintf("/file/%d/", proxy.Port), http.StripPrefix(fmt.Sprintf("/file/%d/", proxy.Port), http.FileServer(http.Dir(proxy.Domain))))
fmt.Printf("Setting up file server for port %d at %s\n", proxy.Port, proxy.Domain)
default:
fmt.Printf("Unknown proxy type: %s\n", proxy.ProxyType)
}
}
}
// 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
}
reverseProxy := httputil.NewSingleHostReverseProxy(remote)
// 启动 HTTP 服务器并监听指定端口
server := &http.Server{
Addr: fmt.Sprintf(":%d", proxy.Port),
Handler: reverseProxy,
}
fmt.Printf("Starting HTTP proxy on port %d and forwarding to %s:%d\n", proxy.Port, proxy.Domain, proxy.Port)
if err := server.ListenAndServe(); err != nil {
fmt.Printf("Failed to start 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()
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
}
}
}