grpc/react/ui.go

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// Copyright 2022 Linka Cloud All rights reserved.
//
// 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 react
import (
"io/fs"
"net/http"
"net/http/httputil"
"net/url"
"os"
"strings"
)
const (
EndpointEnv = "REACT_ENDPOINT"
)
func NewHandler(dir fs.FS, subpath string) (http.Handler, error) {
if e := os.Getenv(EndpointEnv); e != "" {
return newProxy(e)
}
return newStatic(dir, subpath)
}
func newStatic(dir fs.FS, subpath string) (http.Handler, error) {
s, err := fs.Sub(dir, subpath)
if err != nil {
return nil, err
}
fsrv := http.FileServer(http.FS(s))
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if _, err := fs.Stat(s, strings.TrimPrefix(r.URL.Path, "/")); err != nil {
r.URL.Path = "/"
}
fsrv.ServeHTTP(w, r)
}), nil
}
func newProxy(endpoint string) (http.Handler, error) {
u, err := url.Parse(endpoint)
if err != nil {
return nil, err
}
p := httputil.NewSingleHostReverseProxy(u)
return p, nil
}
func DevEnv() bool {
return os.Getenv(EndpointEnv) != ""
}