// 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/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 { 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 }