blob: 4767a2cc27261f26a0b2f752403c675aa9f16e71 [file] [log] [blame]
// Copyright 2011 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.
// +build appengine
package main
import (
"bufio"
"bytes"
"io"
"net/http"
"strings"
"appengine"
_ "golang.org/x/tools/playground"
)
const runUrl = "https://golang.org/compile"
func init() {
http.Handle("/lesson/", hstsHandler(lessonHandler))
http.Handle("/", hstsHandler(rootHandler))
if err := initTour(".", "HTTPTransport"); err != nil {
panic(err)
}
}
func rootHandler(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
if err := renderUI(w); err != nil {
c.Criticalf("UI render: %v", err)
}
}
func lessonHandler(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
lesson := strings.TrimPrefix(r.URL.Path, "/lesson/")
if err := writeLesson(lesson, w); err != nil {
if err == lessonNotFound {
http.NotFound(w, r)
} else {
c.Criticalf("tour render: %v", err)
}
}
}
// prepContent returns a Reader that produces the content from the given
// Reader, but strips the prefix "#appengine: " from each line. It also drops
// any non-blank like that follows a series of 1 or more lines with the prefix.
func prepContent(in io.Reader) io.Reader {
var prefix = []byte("#appengine: ")
out, w := io.Pipe()
go func() {
r := bufio.NewReader(in)
drop := false
for {
b, err := r.ReadBytes('\n')
if err != nil && err != io.EOF {
w.CloseWithError(err)
return
}
if bytes.HasPrefix(b, prefix) {
b = b[len(prefix):]
drop = true
} else if drop {
if len(b) > 1 {
b = nil
}
drop = false
}
if len(b) > 0 {
w.Write(b)
}
if err == io.EOF {
w.Close()
return
}
}
}()
return out
}
// socketAddr returns the WebSocket handler address.
// The App Engine version does not provide a WebSocket handler.
func socketAddr() string { return "" }
// hstsHandler wraps an http.HandlerFunc such that it sets the HSTS header.
func hstsHandler(fn http.HandlerFunc) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Strict-Transport-Security", "max-age=31536000; preload")
fn(w, r)
})
}