зеркало из https://github.com/golang/tools.git
91 строка
2.3 KiB
Go
91 строка
2.3 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package playground registers HTTP handlers at "/compile" and "/share" that
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// proxy requests to the golang.org playground service.
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// This package may be used unaltered on App Engine Standard with Go 1.11+ runtime.
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package playground // import "golang.org/x/tools/playground"
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import (
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"bytes"
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"context"
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"fmt"
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"io"
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"log"
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"net/http"
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"os"
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"strings"
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"time"
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"golang.org/x/tools/godoc/golangorgenv"
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)
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const baseURL = "https://play.golang.org"
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func init() {
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http.HandleFunc("/compile", bounce)
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http.HandleFunc("/share", bounce)
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}
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func bounce(w http.ResponseWriter, r *http.Request) {
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b := new(bytes.Buffer)
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if err := passThru(b, r); os.IsPermission(err) {
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http.Error(w, "403 Forbidden", http.StatusForbidden)
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log.Println(err)
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return
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} else if err != nil {
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http.Error(w, "500 Internal Server Error", http.StatusInternalServerError)
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log.Println(err)
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return
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}
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io.Copy(w, b)
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}
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func passThru(w io.Writer, req *http.Request) error {
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if req.URL.Path == "/share" && googleCN(req) {
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return os.ErrPermission
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}
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defer req.Body.Close()
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url := baseURL + req.URL.Path
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ctx, cancel := context.WithTimeout(req.Context(), 60*time.Second)
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defer cancel()
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r, err := post(ctx, url, req.Header.Get("Content-Type"), req.Body)
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if err != nil {
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return fmt.Errorf("making POST request: %v", err)
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}
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defer r.Body.Close()
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if _, err := io.Copy(w, r.Body); err != nil {
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return fmt.Errorf("copying response Body: %v", err)
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}
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return nil
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}
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func post(ctx context.Context, url, contentType string, body io.Reader) (*http.Response, error) {
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req, err := http.NewRequest(http.MethodPost, url, body)
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if err != nil {
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return nil, fmt.Errorf("http.NewRequest: %v", err)
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}
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req.Header.Set("Content-Type", contentType)
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return http.DefaultClient.Do(req.WithContext(ctx))
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}
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// googleCN reports whether request r is considered
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// to be served from golang.google.cn.
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func googleCN(r *http.Request) bool {
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if r.FormValue("googlecn") != "" {
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return true
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}
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if strings.HasSuffix(r.Host, ".cn") {
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return true
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}
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if !golangorgenv.CheckCountry() {
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return false
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}
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switch r.Header.Get("X-Appengine-Country") {
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case "", "ZZ", "CN":
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return true
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}
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return false
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}
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