package server import ( "context" "fmt" "html/template" "net" "net/http" "strconv" "github.com/go-chi/chi/v5" "github.com/pkg/errors" "gitlab.com/wpetit/goweb/api" "gitlab.com/wpetit/goweb/logger" _ "embed" ) var ( //go:embed templates/idle.html.gotmpl rawIdleTemplate []byte idleTemplate *template.Template ) func init() { tmpl, err := template.New("").Parse(string(rawIdleTemplate)) if err != nil { panic(errors.Wrap(err, "could not parse idle template")) } idleTemplate = tmpl } func (s *Server) startHTTPServer(ctx context.Context) error { router := chi.NewRouter() router.Get("/", s.handleHome) router.Post("/api/v1/cast", s.handleCast) router.Delete("/api/v1/cast", s.handleReset) router.Get("/api/v1/status", s.handleStatus) server := http.Server{ Addr: s.address, Handler: router, } listener, err := net.Listen("tcp", s.address) if err != nil { return errors.WithStack(err) } host, rawPort, err := net.SplitHostPort(listener.Addr().String()) if err != nil { return errors.WithStack(err) } port, err := strconv.ParseInt(rawPort, 10, 32) if err != nil { return errors.Wrapf(err, "could not parse listening port '%v'", rawPort) } logger.Debug(ctx, "listening for tcp connections", logger.F("port", port), logger.F("host", host)) s.port = int(port) go func() { logger.Debug(ctx, "starting http server") if err := server.Serve(listener); err != nil && !errors.Is(err, http.ErrServerClosed) { logger.Error(ctx, "could not listen", logger.CapturedE(errors.WithStack(err))) } }() go func() { <-ctx.Done() logger.Debug(ctx, "closing http server") if err := server.Close(); err != nil { logger.Error(ctx, "could not close http server", logger.CapturedE(errors.WithStack(err))) } }() if err := s.resetBrowser(); err != nil { return errors.WithStack(err) } return nil } type CastRequest struct { URL string `json:"url" validate:"required"` } func (s *Server) handleCast(w http.ResponseWriter, r *http.Request) { req := &CastRequest{} if ok := api.Bind(w, r, req); !ok { return } if err := s.browser.Load(req.URL); err != nil { logger.Error(r.Context(), "could not load url", logger.CapturedE(errors.WithStack(err))) api.ErrorResponse(w, http.StatusInternalServerError, api.ErrCodeUnknownError, nil) return } http.Redirect(w, r, "/api/v1/status", http.StatusSeeOther) } func (s *Server) handleReset(w http.ResponseWriter, r *http.Request) { if err := s.resetBrowser(); err != nil { logger.Error(r.Context(), "could not unload url", logger.CapturedE(errors.WithStack(err))) api.ErrorResponse(w, http.StatusInternalServerError, api.ErrCodeUnknownError, nil) return } http.Redirect(w, r, "/api/v1/status", http.StatusSeeOther) } func (s *Server) resetBrowser() error { idleURL := fmt.Sprintf("http://localhost:%d", s.port) if err := s.browser.Reset(idleURL); err != nil { return errors.WithStack(err) } return nil } type StatusResponse struct { ID string `json:"id"` URL string `json:"url"` Status string `json:"status"` Title string `json:"title"` } func (s *Server) handleStatus(w http.ResponseWriter, r *http.Request) { url, err := s.browser.URL() if err != nil { logger.Error(r.Context(), "could not retrieve browser url", logger.CapturedE(errors.WithStack(err))) api.ErrorResponse(w, http.StatusInternalServerError, api.ErrCodeUnknownError, nil) return } status, err := s.browser.Status() if err != nil { logger.Error(r.Context(), "could not retrieve browser status", logger.CapturedE(errors.WithStack(err))) api.ErrorResponse(w, http.StatusInternalServerError, api.ErrCodeUnknownError, nil) return } title, err := s.browser.Title() if err != nil { logger.Error(r.Context(), "could not retrieve browser page title", logger.CapturedE(errors.WithStack(err))) api.ErrorResponse(w, http.StatusInternalServerError, api.ErrCodeUnknownError, nil) return } api.DataResponse(w, http.StatusOK, &StatusResponse{ ID: s.instanceID, URL: url, Status: status.String(), Title: title, }) } func (s *Server) handleHome(w http.ResponseWriter, r *http.Request) { type templateData struct { IPs []string Port int ID string } ips, err := getLANIPv4Addrs() if err != nil { logger.Error(r.Context(), "could not retrieve lan ip addresses", logger.CapturedE(errors.WithStack(err))) http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError) return } d := templateData{ ID: s.instanceID, IPs: ips, Port: s.port, } if err := idleTemplate.Execute(w, d); err != nil { logger.Error(r.Context(), "could not render idle page", logger.CapturedE(errors.WithStack(err))) } }