snap/server.go

package snap

import (
	"github.com/gorilla/mux"
	"html/template"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"time"
	"path"


	"git.thirdmartini.com/pub/fancylog"
	"git.thirdmartini.com/pub/snap/auth"
)


type Server struct {
	address    string
	path       string
	theme 	   string
	debug      bool
	auth       auth.AuthManager
	router     *mux.Router
	cachedTmpl *template.Template
}


type SnapBaseContent struct {
	Theme string
	Content interface{}
}

func (s *Server) makeContext( auth *auth.AuthData, w http.ResponseWriter, r *http.Request ) (*Context) {
	c := &Context{
		r: r,
		w: w,
		srv: s,
		auth: auth,
		vars: mux.Vars(r),
	}
	return c
}


func (s *Server) plain(f func(c *Context)) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		c := s.makeContext( nil, w,r)
		f(c)
	}
}


func (s *Server) authenticated(auth auth.AuthManager, handle func(c *Context)) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		rec, ok := auth.DoAuth( w, r )

		if !ok {
			http.Error(w, "Not authorized", 401)
		} else {
			c := s.makeContext( rec, w,r)
			handle(c)
		}
	}
}

func (s *Server) wrapper(handle func(c *Context)) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		c := s.makeContext( nil, w,r)
		handle(c)
	}
}


func (s *Server) loadTemplates() *template.Template {
	tmpl := template.New("")

	err := filepath.Walk(path.Join(s.path, "templates"), func(path string, info os.FileInfo, err error) error {
		if strings.Contains(path, ".html") {
			_, err = tmpl.ParseFiles(path)
			if err != nil {
				log.Println(err)
			}
		}
		return err
	})

	if err != nil {
		log.Fatal(err)
	}

	return tmpl
}

func (s *Server) getTemplates() *template.Template {
	if s.debug {
		return s.loadTemplates()
	}

	if s.cachedTmpl == nil {
		s.cachedTmpl = s.loadTemplates()
	}
	return s.cachedTmpl
}

func (s *Server) render(w http.ResponseWriter, tmpl string, content interface{} ) {
	s.getTemplates().ExecuteTemplate(w, tmpl, content)
}

func (s *Server) reply(w http.ResponseWriter, msg string) {
	w.Write([]byte(msg))
}

func (s *Server) renderError(w http.ResponseWriter, code int, msg string) {
	w.WriteHeader(code)
	w.Write([]byte(msg))
}


func (s *Server) HandleFuncAuthenticated(path string, f func(c *Context)) *mux.Route {
	if s.auth == nil {
		return nil
	}

	return s.router.HandleFunc(path, s.authenticated(s.auth, f))
}

func (s *Server) HandleFuncCustomAuth(auth auth.AuthManager, path string, f func(c *Context)) *mux.Route {
	if auth == nil {
		log.Warn("Nil auth on", path)
		return nil
	}
	return s.router.HandleFunc(path, s.authenticated(auth, f))
}


func (s *Server) HandleFunc(path string, f func(c *Context)) error {
	s.router.HandleFunc(path, s.wrapper(f))
	return nil
}


func (s *Server) SetDebug(enable bool) {
	s.debug = enable
}

func (s *Server) EnableStatus(path string) {
}


func (s *Server) SetTheme(theme string) {
	s.theme = theme
}


func (s *Server) ServeTLS(keyPath string, certPath string) error {
	srv := &http.Server{
		Handler: s.router,
		Addr:    s.address,
		// Good practice: enforce timeouts for servers you create!
		WriteTimeout: 120 * time.Second,
		ReadTimeout:  120 * time.Second,
	}

	return srv.ListenAndServeTLS(certPath,keyPath)
}

// Serve serve content forever
func (s *Server) Serve() error {
	srv := &http.Server{
		Handler: s.router,
		Addr:    s.address,
		// Good practice: enforce timeouts for servers you create!
		WriteTimeout: 120 * time.Second,
		ReadTimeout:  120 * time.Second,
	}

	return srv.ListenAndServe()
}

func New(address string, path string, auth auth.AuthManager) *Server {
	s := Server{
		router:  mux.NewRouter(),
		auth:    auth,
		address: address,
		path:    path,
		theme:   "/static/css/default.css",
	}

	s.router.PathPrefix("/static/").Handler(http.StripPrefix("/static/", http.FileServer(http.Dir(s.path+"static/"))))
	return &s
}