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static_handler.go
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/
static_handler.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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.
package app
import (
"net/http"
"strings"
"github.com/gorilla/mux"
)
const (
defaultStaticAssetsRoot = "jaeger-ui-build/build/"
)
var (
staticRootFiles = []string{"favicon.ico"}
)
// StaticAssetsHandler handles static assets
type StaticAssetsHandler struct {
staticAssetsRoot string
}
// NewStaticAssetsHandler returns a StaticAssetsHandler
func NewStaticAssetsHandler(staticAssetsRoot string) *StaticAssetsHandler {
if staticAssetsRoot == "" {
staticAssetsRoot = defaultStaticAssetsRoot
}
if !strings.HasSuffix(staticAssetsRoot, "/") {
staticAssetsRoot = staticAssetsRoot + "/"
}
return &StaticAssetsHandler{staticAssetsRoot: staticAssetsRoot}
}
// RegisterRoutes registers routes for this handler on the given router
func (sH *StaticAssetsHandler) RegisterRoutes(router *mux.Router) {
router.PathPrefix("/static").Handler(http.FileServer(http.Dir(sH.staticAssetsRoot)))
for _, file := range staticRootFiles {
router.Path("/" + file).HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, sH.staticAssetsRoot+file)
})
}
router.NotFoundHandler = http.HandlerFunc(sH.notFound)
}
func (sH *StaticAssetsHandler) notFound(w http.ResponseWriter, r *http.Request) {
// don't allow returning "304 Not Modified" for index.html because
// the cached versions might have the wrong filenames for javascript assets
delete(r.Header, "If-Modified-Since")
http.ServeFile(w, r, sH.staticAssetsRoot+"index.html")
}