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// Copyright (C) 2014 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package api
import (
"fmt"
"net/http"
"os"
"path/filepath"
"strings"
"time"
"github.com/syncthing/syncthing/lib/api/auto"
"github.com/syncthing/syncthing/lib/assets"
"github.com/syncthing/syncthing/lib/config"
"github.com/syncthing/syncthing/lib/sync"
)
const themePrefix = "theme-assets/"
type staticsServer struct {
assetDir string
assets map[string]assets.Asset
availableThemes []string
mut sync.RWMutex
theme string
lastThemeChange time.Time
untrusted bool
}
func newStaticsServer(theme, assetDir string, untrusted bool) *staticsServer {
s := &staticsServer{
assetDir: assetDir,
assets: auto.Assets(),
mut: sync.NewRWMutex(),
theme: theme,
lastThemeChange: time.Now().UTC(),
untrusted: untrusted,
}
seen := make(map[string]struct{})
// Load themes from compiled in assets.
for file := range auto.Assets() {
theme := strings.Split(file, "/")[0]
if _, ok := seen[theme]; !ok {
seen[theme] = struct{}{}
s.availableThemes = append(s.availableThemes, theme)
}
}
if assetDir != "" {
// Load any extra themes from the asset override dir.
for _, dir := range dirNames(assetDir) {
if _, ok := seen[dir]; !ok {
seen[dir] = struct{}{}
s.availableThemes = append(s.availableThemes, dir)
}
}
}
if untrusted {
l.Infoln(`Feature flag "untrusted":`, untrusted)
}
return s
}
func (s *staticsServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
switch r.URL.Path {
case "/themes.json":
s.serveThemes(w, r)
default:
s.serveAsset(w, r)
}
}
func (s *staticsServer) serveAsset(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Cache-Control", "no-cache, must-revalidate")
file := r.URL.Path
if file[0] == '/' {
file = file[1:]
}
if len(file) == 0 {
file = "index.html"
}
s.mut.RLock()
theme := s.theme
modificationTime := s.lastThemeChange
untrusted := s.untrusted
s.mut.RUnlock()
// If path starts with special prefix, get theme and file from path
if strings.HasPrefix(file, themePrefix) {
path := file[len(themePrefix):]
i := strings.IndexRune(path, '/')
if i == -1 {
http.NotFound(w, r)
return
}
theme = path[:i]
file = path[i+1:]
}
// Check for an override for the current theme.
if untrusted && s.serveFromAssetDir(file, theme+"/untrusted", w, r) {
l.Debugln("serving", file, "from override untrusted")
return
}
if s.serveFromAssetDir(file, theme, w, r) {
return
}
// Check for a compiled in asset for the current theme.
if untrusted && s.serveFromAssets(file, theme+"/untrusted", modificationTime, w, r) {
l.Debugln("serving", file, "from compiled untrusted")
return
}
if s.serveFromAssets(file, theme, modificationTime, w, r) {
return
}
// Check for an overridden default asset.
if untrusted && s.serveFromAssetDir(file, config.DefaultTheme+"/untrusted", w, r) {
l.Debugln("serving", file, "from override untrusted")
return
}
if s.serveFromAssetDir(file, config.DefaultTheme, w, r) {
return
}
// Check for a compiled in default asset.
if untrusted && s.serveFromAssets(file, config.DefaultTheme+"/untrusted", modificationTime, w, r) {
l.Debugln("serving", file, "from compiled untrusted")
return
}
if s.serveFromAssets(file, config.DefaultTheme, modificationTime, w, r) {
return
}
http.NotFound(w, r)
}
func (s *staticsServer) serveFromAssetDir(file, theme string, w http.ResponseWriter, r *http.Request) bool {
if s.assetDir == "" {
return false
}
p := filepath.Join(s.assetDir, theme, filepath.FromSlash(file))
if _, err := os.Stat(p); err != nil {
return false
}
mtype := assets.MimeTypeForFile(file)
if len(mtype) != 0 {
w.Header().Set("Content-Type", mtype)
}
http.ServeFile(w, r, p)
return true
}
func (s *staticsServer) serveFromAssets(file, theme string, modificationTime time.Time, w http.ResponseWriter, r *http.Request) bool {
as, ok := s.assets[theme+"/"+file]
if !ok {
return false
}
as.Modified = modificationTime
assets.Serve(w, r, as)
return true
}
func (s *staticsServer) serveThemes(w http.ResponseWriter, r *http.Request) {
sendJSON(w, map[string][]string{
"themes": s.availableThemes,
})
}
func (s *staticsServer) setTheme(theme string) {
s.mut.Lock()
s.theme = theme
s.lastThemeChange = time.Now().UTC()
s.mut.Unlock()
}
func (s *staticsServer) setUntrusted(enabled bool) {
s.mut.Lock()
l.Infoln(`Feature flag "untrusted":`, enabled)
s.untrusted = enabled
s.mut.Unlock()
}
func (s *staticsServer) String() string {
return fmt.Sprintf("staticsServer@%p", s)
}
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