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// Copyright 2013 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 (
"fmt"
"go/build"
"log"
"net/http"
"os"
"path/filepath"
"runtime"
"strings"
"sync"
"golang.org/x/tools/blog"
"golang.org/x/tools/godoc/redirect"
)
const (
blogRepo = "golang.org/x/blog"
blogURL = "https://blog.golang.org/"
blogPath = "/blog/"
)
var (
blogServer http.Handler // set by blogInit
blogInitOnce sync.Once
playEnabled bool
)
func init() {
// Initialize blog only when first accessed.
http.HandleFunc(blogPath, func(w http.ResponseWriter, r *http.Request) {
blogInitOnce.Do(func() {
blogInit(r.Host)
})
blogServer.ServeHTTP(w, r)
})
}
func blogInit(host string) {
// Binary distributions included the blog content in "/blog".
// We stopped including this in Go 1.11.
root := filepath.Join(runtime.GOROOT(), "blog")
// Prefer content from the golang.org/x/blog repository if present.
if pkg, err := build.Import(blogRepo, "", build.FindOnly); err == nil {
root = pkg.Dir
}
// If content is not available fall back to redirect.
if fi, err := os.Stat(root); err != nil || !fi.IsDir() {
fmt.Fprintf(os.Stderr, "Blog content not available locally. "+
"To install, run \n\tgo get %v\n", blogRepo)
blogServer = http.HandlerFunc(blogRedirectHandler)
return
}
s, err := blog.NewServer(blog.Config{
BaseURL: blogPath,
BasePath: strings.TrimSuffix(blogPath, "/"),
ContentPath: filepath.Join(root, "content"),
TemplatePath: filepath.Join(root, "template"),
HomeArticles: 5,
PlayEnabled: playEnabled,
ServeLocalLinks: strings.HasPrefix(host, "localhost"),
})
if err != nil {
log.Fatal(err)
}
blogServer = s
}
func blogRedirectHandler(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == blogPath {
http.Redirect(w, r, blogURL, http.StatusFound)
return
}
blogPrefixHandler.ServeHTTP(w, r)
}
var blogPrefixHandler = redirect.PrefixHandler(blogPath, blogURL)
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