traefik/pkg/api/dashboard/dashboard.go

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package dashboard
import (
"io/fs"
"net/http"
"net/url"
"github.com/gorilla/mux"
"github.com/traefik/traefik/v2/webui"
)
// Handler expose dashboard routes.
type Handler struct {
assets fs.FS // optional assets, to override the webui.FS default
}
// Append adds dashboard routes on the given router, optionally using the given
// assets (or webui.FS otherwise).
func Append(router *mux.Router, customAssets fs.FS) {
assets := customAssets
if assets == nil {
assets = webui.FS
}
// Expose dashboard
router.Methods(http.MethodGet).
Path("/").
HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
http.Redirect(resp, req, safePrefix(req)+"/dashboard/", http.StatusFound)
})
router.Methods(http.MethodGet).
PathPrefix("/dashboard/").
HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// allow iframes from our domains only
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-src
w.Header().Set("Content-Security-Policy", "frame-src 'self' https://traefik.io https://*.traefik.io;")
// The content type must be guessed by the file server.
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options
w.Header().Del("Content-Type")
http.StripPrefix("/dashboard/", http.FileServer(http.FS(assets))).ServeHTTP(w, r)
})
}
func (g Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
assets := g.assets
if assets == nil {
assets = webui.FS
}
// allow iframes from our domains only
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-src
w.Header().Set("Content-Security-Policy", "frame-src 'self' https://traefik.io https://*.traefik.io;")
// The content type must be guessed by the file server.
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options
w.Header().Del("Content-Type")
http.FileServer(http.FS(assets)).ServeHTTP(w, r)
}
func safePrefix(req *http.Request) string {
prefix := req.Header.Get("X-Forwarded-Prefix")
if prefix == "" {
return ""
}
parse, err := url.Parse(prefix)
if err != nil {
return ""
}
if parse.Host != "" {
return ""
}
return parse.Path
}