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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"bytes"
"fmt"
"io/fs"
"net/http"
"net/url"
"time"
"golang.org/x/tools/godoc/static"
"golang.org/x/tools/playground/socket"
"golang.org/x/tools/present"
// This will register a handler at /compile that will proxy to the
// respective endpoints at play.golang.org. This allows the frontend to call
// these endpoints without needing cross-origin request sharing (CORS).
// Note that this is imported regardless of whether the endpoints are used or
// not (in the case of a local socket connection, they are not called).
_ "golang.org/x/tools/playground"
)
var scripts = []string{"jquery.js", "jquery-ui.js", "playground.js", "play.js"}
// playScript registers an HTTP handler at /play.js that serves all the
// scripts specified by the variable above, and appends a line that
// initializes the playground with the specified transport.
func playScript(fsys fs.FS, transport string) {
modTime := time.Now()
var buf bytes.Buffer
for _, p := range scripts {
if s, ok := static.Files[p]; ok {
buf.WriteString(s)
continue
}
b, err := fs.ReadFile(fsys, "static/"+p)
if err != nil {
panic(err)
}
buf.Write(b)
}
fmt.Fprintf(&buf, "\ninitPlayground(new %v());\n", transport)
b := buf.Bytes()
http.HandleFunc("/play.js", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-type", "application/javascript")
http.ServeContent(w, r, "", modTime, bytes.NewReader(b))
})
}
func initPlayground(fsys fs.FS, origin *url.URL) {
if !present.PlayEnabled {
return
}
if *usePlayground {
playScript(fsys, "HTTPTransport")
return
}
playScript(fsys, "SocketTransport")
http.Handle("/socket", socket.NewHandler(origin))
}
func playable(c present.Code) bool {
play := present.PlayEnabled && c.Play
// Restrict playable files to only Go source files when using play.golang.org,
// since there is no method to execute shell scripts there.
if *usePlayground {
return play && c.Ext == ".go"
}
return play
}
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