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// Copyright 2024 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Contains an embedded version of livereload.js
//
// Copyright (c) 2010-2015 Andrey Tarantsov
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package livereload
import (
"fmt"
"net"
"net/http"
"net/url"
"path/filepath"
_ "embed"
"github.com/gohugoio/hugo/media"
"github.com/gorilla/websocket"
)
// Prefix to signal to LiveReload that we need to navigate to another path.
// Do not change this.
const hugoNavigatePrefix = "__hugo_navigate"
var upgrader = &websocket.Upgrader{
// Hugo may potentially spin up multiple HTTP servers, so we need to exclude the
// port when checking the origin.
CheckOrigin: func(r *http.Request) bool {
origin := r.Header["Origin"]
if len(origin) == 0 {
return true
}
u, err := url.Parse(origin[0])
if err != nil {
return false
}
rHost := r.Host
// For Github codespace in browser #9936
if forwardedHost := r.Header.Get("X-Forwarded-Host"); forwardedHost != "" {
rHost = forwardedHost
}
if u.Host == rHost {
return true
}
h1, _, err := net.SplitHostPort(u.Host)
if err != nil {
return false
}
h2, _, err := net.SplitHostPort(r.Host)
if err != nil {
return false
}
return h1 == h2
},
ReadBufferSize: 1024, WriteBufferSize: 1024,
}
// Handler is a HandlerFunc handling the livereload
// Websocket interaction.
func Handler(w http.ResponseWriter, r *http.Request) {
ws, err := upgrader.Upgrade(w, r, nil)
if err != nil {
return
}
c := &connection{send: make(chan []byte, 256), ws: ws}
wsHub.register <- c
defer func() { wsHub.unregister <- c }()
go c.writer()
c.reader()
}
// Initialize starts the Websocket Hub handling live reloads.
func Initialize() {
go wsHub.run()
}
// ForceRefresh tells livereload to force a hard refresh.
func ForceRefresh() {
RefreshPath("/x.js")
}
// NavigateToPathForPort is similar to NavigateToPath but will also
// set window.location.port to the given port value.
func NavigateToPathForPort(path string, port int) {
refreshPathForPort(hugoNavigatePrefix+path, port)
}
// RefreshPath tells livereload to refresh only the given path.
// If that path points to a CSS stylesheet or an image, only the changes
// will be updated in the browser, not the entire page.
func RefreshPath(s string) {
refreshPathForPort(s, -1)
}
func refreshPathForPort(s string, port int) {
// Tell livereload a file has changed - will force a hard refresh if not CSS or an image
urlPath := filepath.ToSlash(s)
portStr := ""
if port > 0 {
portStr = fmt.Sprintf(`, "overrideURL": %d`, port)
}
msg := fmt.Sprintf(`{"command":"reload","path":%q,"originalPath":"","liveCSS":true,"liveImg":true%s}`, urlPath, portStr)
wsHub.broadcast <- []byte(msg)
}
// ServeJS serves the livereload.js who's reference is injected into the page.
func ServeJS(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", media.Builtin.JavascriptType.Type)
w.Write(liveReloadJS())
}
func liveReloadJS() []byte {
return []byte(livereloadJS)
}
//go:embed livereload.min.js
var livereloadJS string
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