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routes.go
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routes.go
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package main
import (
"embed"
"encoding/json"
"io/fs"
"log"
"net/http"
"strings"
"github.com/gorilla/mux"
"github.com/gorilla/websocket"
"github.com/urfave/negroni"
)
// embed assets resources for ui
//go:embed ui/dist/assets/*
var assetsDir embed.FS
//go:embed ui/dist/index.html
var indexPage []byte
const version string = "0.1.0"
// Routes API object
type Routes struct {
Mux *mux.Router
Negroni *negroni.Negroni
tunnels *TunnelsManager
}
// NewRoutes create API backend for the program
func NewRoutes(tm *TunnelsManager) Routes {
r := Routes{}
r.tunnels = tm
return r
}
/* MIDDLEWARE */
func defaultHeaderMiddleware(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
rw.Header().Set("Access-Control-Allow-Origin", "*")
rw.Header().Set("Access-Control-Allow-Headers", "Content-Type, Origin, Accept, Authorization")
next(rw, r)
}
/* API */
func getVersion(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(version))
}
func (t *TunnelsManager) getTunnels(w http.ResponseWriter, r *http.Request) {
data, err := json.Marshal(t.tunnelsMap)
if err != nil {
log.Println(err)
}
w.Write(data)
}
func (t *TunnelsManager) openTunnel(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
name := params["name"]
log.Printf("open tunnel %s", name)
t.CreateTunnel(name)
}
func (t *TunnelsManager) closeTunnel(w http.ResponseWriter, r *http.Request) {}
/* WEBSOCKET */
func (t *TunnelsManager) wsEndpoint(w http.ResponseWriter, r *http.Request) {
// upgrade this connection to a WebSocket
// connection
ws, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println(err)
}
//log.Println("Client Connected")
err = ws.WriteMessage(1, []byte("Hi Client!"))
if err != nil {
log.Println(err)
}
wsSend(ws, t.buffer)
}
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool { return true },
}
func wsSend(conn *websocket.Conn, c chan string) {
for {
select {
case msg := <-c:
if err := conn.WriteMessage(1, []byte(strings.ToUpper(msg))); err != nil {
log.Println(err)
return
}
}
}
}
// Run API function
func (r *Routes) Run(addr string) {
// Define mux
r.Mux = mux.NewRouter()
// API handler
r.Mux.HandleFunc("/api/version", getVersion).Methods("GET")
// API tunnel handler
r.Mux.HandleFunc("/api/tunnels", r.tunnels.getTunnels).Methods("GET")
r.Mux.HandleFunc("/api/open/{name}", r.tunnels.openTunnel).Methods("POST")
r.Mux.HandleFunc("/api/close/{name}", r.tunnels.closeTunnel).Methods("POST")
// WebSocket handler
r.Mux.HandleFunc("/api/ws", r.tunnels.wsEndpoint)
// UI handler
assetsSubFs, _ := fs.Sub(fs.FS(assetsDir), "ui/dist")
assetsFileServe := http.FileServer(http.FS(assetsSubFs))
r.Mux.PathPrefix("/assets/").Handler(assetsFileServe)
r.Mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "text/html")
w.Write(indexPage)
})
// Define negroni middleware
r.Negroni = negroni.New()
r.Negroni.Use(negroni.HandlerFunc(defaultHeaderMiddleware))
r.Negroni.UseHandler(r.Mux)
log.Fatal(http.ListenAndServe(addr, r.Negroni))
}