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// Copyright 2023 The Prometheus Authors
// 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 reactapp
import (
"fmt"
"io"
"log/slog"
"net/http"
"path"
"github.com/prometheus/common/route"
"github.com/prometheus/common/server"
)
var reactRouterPaths = []string{
"/",
"/status",
}
func Register(r *route.Router, logger *slog.Logger) {
serveReactApp := func(w http.ResponseWriter, r *http.Request) {
f, err := Assets.Open("/dist/index.html")
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "Error opening React index.html: %v", err)
return
}
defer func() { _ = f.Close() }()
idx, err := io.ReadAll(f)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "Error reading React index.html: %v", err)
return
}
w.Write(idx)
}
// Static files required by the React app.
r.Get("/react-app/*filepath", func(w http.ResponseWriter, r *http.Request) {
for _, rt := range reactRouterPaths {
if r.URL.Path != "/react-app"+rt {
continue
}
serveReactApp(w, r)
return
}
r.URL.Path = path.Join("/dist", route.Param(r.Context(), "filepath"))
fs := server.StaticFileServer(Assets)
fs.ServeHTTP(w, r)
})
}