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static_handler.go
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static_handler.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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 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")
}