blob: 04c485139d603d06e0573461f918f9f8ff07cbe9 [file] [log] [blame]
// 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.
// Command blog is a web server for the Go blog that can run on App Engine or
// as a stand-alone HTTP server.
package main
import (
"flag"
"html/template"
"log"
"net"
"net/http"
"os"
"path/filepath"
"strings"
"golang.org/x/tools/blog"
_ "golang.org/x/tools/playground"
"golang.org/x/website"
"golang.org/x/website/internal/backport/httpfs"
)
var (
httpAddr = flag.String("http", "localhost:8080", "HTTP listen address")
reload = flag.Bool("reload", false, "reload content on each page load")
runningOnAppEngine = os.Getenv("GAE_ENV") != ""
blogRoot = "./"
)
const hostname = "blog.golang.org" // default hostname for blog server
var config = blog.Config{
Hostname: hostname,
BaseURL: "https://" + hostname,
GodocURL: "https://golang.org",
HomeArticles: 5, // articles to display on the home page
FeedArticles: 10, // articles to include in Atom and JSON feeds
PlayEnabled: true,
FeedTitle: "The Go Programming Language Blog",
ContentPath: "_content/",
TemplatePath: "_template/",
AnalyticsHTML: template.HTML(os.Getenv("BLOG_ANALYTICS")),
}
func main() {
if runningOnAppEngine {
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
*httpAddr = ":" + port
}
flag.Parse()
if _, err := os.Stat("blog/_content/10years"); err == nil {
blogRoot = "blog/"
}
config.ContentPath = blogRoot + config.ContentPath
config.TemplatePath = blogRoot + config.TemplatePath
h, err := blogHandler()
if err != nil {
log.Fatal(err)
}
http.Handle("/", h)
ln, err := net.Listen("tcp", *httpAddr)
if err != nil {
log.Fatal(err)
}
log.Println("Listening on addr", *httpAddr)
log.Fatal(http.Serve(ln, nil))
}
func blogHandler() (http.Handler, error) {
var h http.Handler
if *reload {
h = http.HandlerFunc(reloadingBlogServer)
} else {
s, err := blog.NewServer(config)
if err != nil {
return nil, err
}
h = s
}
h = maybeStatic(h)
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if runningOnAppEngine {
w.Header().Set("Strict-Transport-Security", "max-age=31536000; preload")
}
h.ServeHTTP(w, r)
})
// Redirect "/blog/" to "/", because the menu bar link is to "/blog/"
// but we're serving from the root.
redirect := func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, "/", http.StatusFound)
}
mux.HandleFunc("/blog", redirect)
mux.HandleFunc("/blog/", redirect)
// Keep these static file handlers in sync with app.yaml.
static := http.FileServer(http.Dir(blogRoot + "static"))
mux.Handle("/favicon.ico", static)
mux.Handle("/fonts.css", static)
mux.Handle("/fonts/", static)
mux.Handle("/lib/godoc/", http.FileServer(httpfs.FS(website.Content)))
// Redirects in redirect.go.
for old, new := range redirects {
new := new // for closure
mux.HandleFunc(old, func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, "/"+new, http.StatusMovedPermanently)
})
}
return mux, nil
}
// maybeStatic serves from _static if possible,
// or else defers to the fallback handler.
func maybeStatic(fallback http.Handler) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
p := r.URL.Path
if strings.Contains(p, ".") && !strings.HasSuffix(p, "/") {
f := filepath.Join("_static", p)
if _, err := os.Stat(f); err == nil {
http.ServeFile(w, r, f)
return
}
}
fallback.ServeHTTP(w, r)
}
}
// reloadingBlogServer is an handler that restarts the blog server on each page
// view. Inefficient; don't enable by default. Handy when editing blog content.
func reloadingBlogServer(w http.ResponseWriter, r *http.Request) {
s, err := blog.NewServer(config)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
s.ServeHTTP(w, r)
}