Golang IPermissions.DenyFunction方法代码示例

// Serve all files in the current directory, or only a few select filetypes (html, css, js, png and txt)
func registerHandlers(mux *http.ServeMux, handlePath, servedir string, perm pinterface.IPermissions, luapool *lStatePool, cache *FileCache, addDomain bool) {

	// Handle all requests with this function
	allRequests := func(w http.ResponseWriter, req *http.Request) {
		if perm.Rejected(w, req) {
			// Get and call the Permission Denied function
			perm.DenyFunction()(w, req)
			// Reject the request by returning
			return
		}

		// Local to this function
		servedir := servedir

		// Look for the directory that is named the same as the host
		if addDomain {
			servedir = filepath.Join(servedir, getDomain(req))
		}

		urlpath := req.URL.Path
		filename := url2filename(servedir, urlpath)
		// Remove the trailing slash from the filename, if any
		noslash := filename
		if strings.HasSuffix(filename, pathsep) {
			noslash = filename[:len(filename)-1]
		}
		hasdir := fs.exists(filename) && fs.isDir(filename)
		dirname := filename
		hasfile := fs.exists(noslash)

		// Set the server header.
		serverHeaders(w)

		// Share the directory or file
		if hasdir {
			dirPage(w, req, servedir, dirname, perm, luapool, cache)
			return
		} else if !hasdir && hasfile {
			// Share a single file instead of a directory
			filePage(w, req, noslash, perm, luapool, cache)
			return
		}
		// Not found
		w.WriteHeader(http.StatusNotFound)
		fmt.Fprint(w, noPage(filename))
	}

	// Handle requests differently depending on if rate limiting is enabled or not
	if disableRateLimiting {
		mux.HandleFunc(handlePath, allRequests)
	} else {
		limiter := tollbooth.NewLimiter(limitRequests, time.Second)
		limiter.MessageContentType = "text/html; charset=utf-8"
		limiter.Message = easyPage("Rate-limit exceeded", "<div style='color:red'>You have reached the maximum request limit.</div>")
		mux.Handle(handlePath, tollbooth.LimitFuncHandler(limiter, allRequests))
	}
}

// Make functions related to server configuration and permissions available
func exportServerConfigFunctions(L *lua.LState, perm pinterface.IPermissions, filename string, luapool *lStatePool) {

	// Set a default host and port. Maybe useful for alg applications.
	L.SetGlobal("SetAddr", L.NewFunction(func(L *lua.LState) int {
		serverAddrLua = L.ToString(1)
		return 0 // number of results
	}))

	// Clear the default path prefixes. This makes everything public.
	L.SetGlobal("ClearPermissions", L.NewFunction(func(L *lua.LState) int {
		perm.Clear()
		return 0 // number of results
	}))

	// Registers a path prefix, for instance "/secret",
	// as having *user* rights.
	L.SetGlobal("AddUserPrefix", L.NewFunction(func(L *lua.LState) int {
		path := L.ToString(1)
		perm.AddUserPath(path)
		return 0 // number of results
	}))

	// Registers a path prefix, for instance "/secret",
	// as having *admin* rights.
	L.SetGlobal("AddAdminPrefix", L.NewFunction(func(L *lua.LState) int {
		path := L.ToString(1)
		perm.AddAdminPath(path)
		return 0 // number of results
	}))

	// Sets a Lua function as a custom "permissions denied" page handler.
	L.SetGlobal("DenyHandler", L.NewFunction(func(L *lua.LState) int {
		luaDenyFunc := L.ToFunction(1)

		// Custom handler for when permissions are denied
		perm.SetDenyFunction(func(w http.ResponseWriter, req *http.Request) {
			// Set up a new Lua state with the current http.ResponseWriter and *http.Request, without caching
			exportCommonFunctions(w, req, filename, perm, L, luapool, nil, nil)

			// Then run the given Lua function
			L.Push(luaDenyFunc)
			if err := L.PCall(0, lua.MultRet, nil); err != nil {
				// Non-fatal error
				log.Error("Permission denied handler failed:", err)
				// Use the default permission handler from now on if the lua function fails
				perm.SetDenyFunction(permissions.PermissionDenied)
				perm.DenyFunction()(w, req)
			}
		})
		return 0 // number of results
	}))

	// Sets a Lua function to be run once the server is done parsing configuration and arguments.
	L.SetGlobal("OnReady", L.NewFunction(func(L *lua.LState) int {
		luaReadyFunc := L.ToFunction(1)

		// Custom handler for when permissions are denied.
		// Put the *lua.LState in a closure.
		serverReadyFunctionLua = func() {
			// Run the given Lua function
			L.Push(luaReadyFunc)
			if err := L.PCall(0, lua.MultRet, nil); err != nil {
				// Non-fatal error
				log.Error("The OnReady function failed:", err)
			}
		}
		return 0 // number of results
	}))

	// Set a access log filename. If blank, the log will go to the console (or browser, if debug mode is set).
	L.SetGlobal("LogTo", L.NewFunction(func(L *lua.LState) int {
		filename := L.ToString(1)
		serverLogFile = filename
		// Log as JSON by default
		log.SetFormatter(&log.JSONFormatter{})
		// Log to stderr if an empty filename is given
		if filename == "" {
			log.SetOutput(os.Stderr)
			L.Push(lua.LBool(true))
			return 1 // number of results
		}
		// Try opening/creating the given filename, for appending
		f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_APPEND, defaultPermissions)
		if err != nil {
			log.Error(err)
			L.Push(lua.LBool(false))
			return 1 // number of results
		}
		// Set the file to log to and return
		log.SetOutput(f)
		L.Push(lua.LBool(true))
		return 1 // number of results
	}))

	// Use a single Lua file as the server, instead of directory structure
	L.SetGlobal("ServerFile", L.NewFunction(func(L *lua.LState) int {
		givenFilename := L.ToString(1)
		serverfilename := filepath.Join(filepath.Dir(filename), givenFilename)
		if !fs.exists(filename) {
//.........这里部分代码省略.........