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// Copyright 2020 PingCAP, 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"net/http"
"net/http/httputil"
"net/url"
"os"
"path"
logprinter "github.com/pingcap/tiup/pkg/logger/printer"
)
// staticServer start a static web server
func staticServer(local string, upstream string) http.Handler {
fs := http.Dir(local)
fsh := http.FileServer(fs)
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if f, err := fs.Open(path.Clean(r.URL.Path)); err == nil {
f.Close()
} else if os.IsNotExist(err) && upstream != "" {
if err := proxyUpstream(w, r, path.Join(local, path.Clean(r.URL.Path)), upstream); err != nil {
logprinter.Errorf("Proxy upstream: %s", err.Error())
fsh.ServeHTTP(w, r)
}
logprinter.Errorf("Handle file: %s", err.Error())
return
}
fsh.ServeHTTP(w, r)
})
}
func proxyUpstream(w http.ResponseWriter, r *http.Request, file, upstream string) error {
url, err := url.Parse(upstream)
if err != nil {
return err
}
r.Host = url.Host
r.URL.Host = url.Host
r.URL.Scheme = url.Scheme
httputil.NewSingleHostReverseProxy(url).ServeHTTP(w, r)
return nil
}
func (s *server) static(prefix, root, upstream string) http.Handler {
return http.StripPrefix(prefix, staticServer(root, upstream))
}
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