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server.go
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server.go
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package restapi
import (
"bytes"
"encoding/json"
"net"
"net/http"
"strings"
"time"
"github.com/go-chi/chi/v5"
"github.com/go-chi/cors"
"github.com/go-chi/render"
"github.com/gorilla/websocket"
V "github.com/feng905/tun2socks/v2/internal/version"
"github.com/feng905/tun2socks/v2/log"
"github.com/feng905/tun2socks/v2/tunnel/statistic"
)
var (
_upgrader = websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool {
return true
},
}
_mountPoints = make(map[string]http.Handler)
)
func registerMountPoint(pattern string, handler http.Handler) {
_mountPoints[pattern] = handler
}
func Start(addr, token string) error {
r := chi.NewRouter()
c := cors.New(cors.Options{
AllowedOrigins: []string{"*"},
AllowedMethods: []string{"GET", "POST", "PUT", "PATCH", "DELETE"},
AllowedHeaders: []string{"Content-Type", "Authorization"},
MaxAge: 300,
})
r.Use(c.Handler)
r.Group(func(r chi.Router) {
r.Use(authenticator(token))
r.Get("/", hello)
r.Get("/logs", getLogs)
r.Get("/traffic", traffic)
r.Get("/version", version)
// attach HTTP handlers
for pattern, handler := range _mountPoints {
r.Mount(pattern, handler)
}
})
listener, err := net.Listen("tcp", addr)
if err != nil {
return err
}
return http.Serve(listener, r)
}
func hello(w http.ResponseWriter, r *http.Request) {
render.JSON(w, r, render.M{"hello": V.Name})
}
func authenticator(token string) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
if token == "" {
next.ServeHTTP(w, r)
return
}
// Browser websocket not support custom header
if websocket.IsWebSocketUpgrade(r) && r.URL.Query().Get("token") != "" {
t := r.URL.Query().Get("token")
if t != token {
render.Status(r, http.StatusUnauthorized)
render.JSON(w, r, ErrUnauthorized)
return
}
next.ServeHTTP(w, r)
return
}
header := r.Header.Get("Authorization")
text := strings.SplitN(header, " ", 2)
hasInvalidHeader := text[0] != "Bearer"
hasInvalidToken := len(text) != 2 || text[1] != token
if hasInvalidHeader || hasInvalidToken {
render.Status(r, http.StatusUnauthorized)
render.JSON(w, r, ErrUnauthorized)
return
}
next.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
}
func getLogs(w http.ResponseWriter, r *http.Request) {
lvl := r.URL.Query().Get("level")
if lvl == "" {
lvl = "info" /* default */
}
level, err := log.ParseLevel(lvl)
if err != nil {
render.Status(r, http.StatusBadRequest)
render.JSON(w, r, ErrBadRequest)
return
}
var wsConn *websocket.Conn
if websocket.IsWebSocketUpgrade(r) {
wsConn, err = _upgrader.Upgrade(w, r, nil)
if err != nil {
return
}
}
if wsConn == nil {
w.Header().Set("Content-Type", "application/json")
render.Status(r, http.StatusOK)
}
sub := log.Subscribe()
defer log.UnSubscribe(sub)
buf := &bytes.Buffer{}
for elm := range sub {
buf.Reset()
e := elm.(*log.Event)
if e.Level > level {
continue
}
if err = json.NewEncoder(buf).Encode(e); err != nil {
break
}
if wsConn == nil {
_, err = w.Write(buf.Bytes())
w.(http.Flusher).Flush()
} else {
err = wsConn.WriteMessage(websocket.TextMessage, buf.Bytes())
}
if err != nil {
break
}
}
}
func traffic(w http.ResponseWriter, r *http.Request) {
var (
err error
wsConn *websocket.Conn
)
if websocket.IsWebSocketUpgrade(r) {
wsConn, err = _upgrader.Upgrade(w, r, nil)
if err != nil {
return
}
}
if wsConn == nil {
w.Header().Set("Content-Type", "application/json")
render.Status(r, http.StatusOK)
}
tick := time.NewTicker(time.Second)
defer tick.Stop()
buf := &bytes.Buffer{}
for range tick.C {
buf.Reset()
up, down := statistic.DefaultManager.Now()
if err = json.NewEncoder(buf).Encode(struct {
Up int64 `json:"up"`
Down int64 `json:"down"`
}{
Up: up,
Down: down,
}); err != nil {
break
}
if wsConn == nil {
_, err = w.Write(buf.Bytes())
w.(http.Flusher).Flush()
} else {
err = wsConn.WriteMessage(websocket.TextMessage, buf.Bytes())
}
if err != nil {
break
}
}
}
func version(w http.ResponseWriter, r *http.Request) {
render.JSON(w, r, render.M{
"version": V.Version,
"commit": V.GitCommit,
"debug": V.Debug(),
"modules": V.Info(),
})
}