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package server
import (
"fmt"
"html/template"
"mime"
"net/http"
"os"
"path/filepath"
"github.com/gorilla/mux"
"github.com/gorilla/websocket"
log "github.com/sirupsen/logrus"
)
const (
errorNotFound = iota
errorNotAllowed = iota
)
type PTYHandler interface {
Write(data []byte) (int, error)
Refresh()
}
// SessionTemplateModel used for templating
type AASessionTemplateModel struct {
SessionID string
Salt string
WSPath string
}
// TTYServerConfig is used to configure the tty server before it is started
type TTYServerConfig struct {
FrontListenAddress string
FrontendPath string
PTY PTYHandler
SessionID string
}
// TTYServer represents the instance of a tty server
type TTYServer struct {
httpServer *http.Server
config TTYServerConfig
session *ttyShareSession
}
func (server *TTYServer) serveContent(w http.ResponseWriter, r *http.Request, name string) {
// If a path to the frontend resources was passed, serve from there, otherwise, serve from the
// builtin bundle
if server.config.FrontendPath == "" {
file, err := Asset(name)
if err != nil {
w.WriteHeader(http.StatusNotFound)
return
}
ctype := mime.TypeByExtension(filepath.Ext(name))
if ctype == "" {
ctype = http.DetectContentType(file)
}
w.Header().Set("Content-Type", ctype)
w.Write(file)
} else {
filePath := server.config.FrontendPath + string(os.PathSeparator) + name
_, err := os.Open(filePath)
if err != nil {
log.Errorf("Couldn't find resource: %s at %s", name, filePath)
w.WriteHeader(http.StatusNotFound)
return
}
log.Debugf("Serving %s from %s", name, filePath)
http.ServeFile(w, r, filePath)
}
}
// NewTTYServer creates a new instance
func NewTTYServer(config TTYServerConfig) (server *TTYServer) {
server = &TTYServer{
config: config,
}
server.httpServer = &http.Server{
Addr: config.FrontListenAddress,
}
routesHandler := mux.NewRouter()
installHandlers := func(session string) {
// This function installs handlers for paths that contain the "session" passed as a
// parameter. The paths are for the static files, websockets, and other.
path := fmt.Sprintf("/s/%s/static/", session)
routesHandler.PathPrefix(path).Handler(http.StripPrefix(path,
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
server.serveContent(w, r, r.URL.Path)
})))
routesHandler.HandleFunc(fmt.Sprintf("/s/%s/", session), func(w http.ResponseWriter, r *http.Request) {
wsPath := "/s/" + session + "/ws"
pathPrefix := "/s/" + session
// Check the frontend/templates/tty-share.in.html file to see where the template applies
templateModel := struct {
PathPrefix string
WSPath string
}{pathPrefix, wsPath}
// TODO Extract these in constants
w.Header().Add("TTYSHARE-VERSION", "1")
w.Header().Add("TTYSHARE-WSPATH", wsPath)
server.handleWithTemplateHtml(w, r, "tty-share.in.html", templateModel)
})
routesHandler.HandleFunc(fmt.Sprintf("/s/%s/ws", session), func(w http.ResponseWriter, r *http.Request) {
server.handleWebsocket(w, r)
})
routesHandler.NotFoundHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
templateModel := struct{ PathPrefix string }{fmt.Sprintf("/s/%s", session)}
server.handleWithTemplateHtml(w, r, "404.in.html", templateModel)
})
}
// Install the same routes on both the /local/ and /<SessionID>/. The session ID is received
// from the tty-proxy server, if a public session is involved.
installHandlers("local")
installHandlers(config.SessionID)
server.httpServer.Handler = routesHandler
server.session = newTTYShareSession(config.PTY)
return server
}
func (server *TTYServer) handleWebsocket(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
w.WriteHeader(http.StatusForbidden)
return
}
upgrader := websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Error("Cannot create the WS connection: ", err.Error())
return
}
// On a new connection, ask for a refresh/redraw of the terminal app
server.config.PTY.Refresh()
server.session.HandleWSConnection(conn)
}
func panicIfErr(err error) {
if err != nil {
panic(err.Error())
}
}
func (server *TTYServer) handleWithTemplateHtml(responseWriter http.ResponseWriter, r *http.Request, templateFile string, templateInterface interface{}) {
var t *template.Template
var err error
if server.config.FrontendPath == "" {
templateDta, err := Asset(templateFile)
panicIfErr(err)
t = template.New(templateFile)
_, err = t.Parse(string(templateDta))
} else {
t, err = template.ParseFiles(server.config.FrontendPath + string(os.PathSeparator) + templateFile)
}
panicIfErr(err)
err = t.Execute(responseWriter, templateInterface)
panicIfErr(err)
}
func (server *TTYServer) Run() (err error) {
err = server.httpServer.ListenAndServe()
log.Debug("Server finished")
return
}
func (server *TTYServer) Write(buff []byte) (written int, err error) {
return server.session.Write(buff)
}
func (server *TTYServer) WindowSize(cols, rows int) (err error) {
return server.session.WindowSize(cols, rows)
}
func (server *TTYServer) Stop() error {
log.Debug("Stopping the server")
return server.httpServer.Close()
}
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