blog: simplify app, stop being a submodule

This app has a lot of history. App Engine used to require different code
for local execution and running on App Engine, because the latter supplied
func main. No longer. Unify all the code into a simpler single file.

Also use the new x/website. (The old go.mod was pinning an older
x/website from before we adopted fs.FS. Now that we have a backported
io/fs, we can use the new x/website, which is what lets us get rid of
the submodule boundary.)

This brings blog in line with the other websites in this repo,
which will help smooth the eventual merge.

Change-Id: Ibe95674ac6765c15bb82a82dc52845a2377cebf7
Reviewed-on: https://go-review.googlesource.com/c/website/+/323894
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Jamal Carvalho <jamal@golang.org>
diff --git a/blog/app.yaml b/blog/app.yaml
index b2aac6e..a0d983c 100644
--- a/blog/app.yaml
+++ b/blog/app.yaml
@@ -1,5 +1,14 @@
+# This app is deployed via Cloud Build as directed by cloudbuild.yaml.
+# Do not deploy directly.
+
 service: blog
-runtime: go114
+runtime: go115
+main: ./blog
+
+handlers:
+- url: /.*
+  script: auto
+  secure: always
 
 env_variables:
   BLOG_ANALYTICS: |
@@ -11,29 +20,3 @@
     gtag("config", "UA-11222381-3");
     gtag("config", "UA-49880327-6");
     </script>
-
-default_expiration: "7d"
-
-handlers:
-
-# Keep these static file handlers in sync with blog.go.
-# They're here for improved latency across global regions.
-- url: /favicon.ico
-  static_files: static/favicon.ico
-  upload: static/favicon.ico
-  secure: always
-- url: /fonts.css
-  static_files: static/fonts.css
-  upload: static/fonts.css
-  secure: always
-- url: /fonts
-  static_dir: static/fonts
-  http_headers:
-    Content-Type: application/font-woff
-  secure: always
-
-# This is here to redirect all HTTP traffic to an HTTPS URL
-# with the same path.
-- url: /.*
-  script: auto
-  secure: always
diff --git a/blog/appengine.go b/blog/appengine.go
deleted file mode 100644
index 0fa729f..0000000
--- a/blog/appengine.go
+++ /dev/null
@@ -1,35 +0,0 @@
-// 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.
-
-// This file implements an App Engine blog server.
-
-package main
-
-import (
-	"html/template"
-	"log"
-	"net/http"
-	"os"
-
-	"golang.org/x/tools/blog"
-)
-
-func gaeMain() {
-	config.ContentPath = "_content/"
-	config.TemplatePath = "_template/"
-	config.AnalyticsHTML = template.HTML(os.Getenv("BLOG_ANALYTICS"))
-	s, err := blog.NewServer(config)
-	if err != nil {
-		log.Fatalln(err)
-	}
-	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Set("Strict-Transport-Security", "max-age=31536000; preload")
-		s.ServeHTTP(w, r)
-	})
-	port := os.Getenv("PORT")
-	if port == "" {
-		port = "8080"
-	}
-	log.Fatal(http.ListenAndServe(":"+port, nil))
-}
diff --git a/blog/blog.go b/blog/blog.go
index 9277c76..04c4851 100644
--- a/blog/blog.go
+++ b/blog/blog.go
@@ -7,52 +7,145 @@
 package main
 
 import (
+	"flag"
+	"html/template"
+	"log"
+	"net"
 	"net/http"
+	"os"
+	"path/filepath"
 	"strings"
-	"time"
 
 	"golang.org/x/tools/blog"
-	"golang.org/x/website/content/static"
-
 	_ "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",
+	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 init() {
+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)
 	}
-	http.HandleFunc("/blog", redirect)
-	http.HandleFunc("/blog/", redirect)
+	mux.HandleFunc("/blog", redirect)
+	mux.HandleFunc("/blog/", redirect)
 
 	// Keep these static file handlers in sync with app.yaml.
-	static := http.FileServer(http.Dir("static"))
-	http.Handle("/favicon.ico", static)
-	http.Handle("/fonts.css", static)
-	http.Handle("/fonts/", static)
+	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)))
 
-	http.Handle("/lib/godoc/", http.StripPrefix("/lib/godoc/", http.HandlerFunc(staticHandler)))
+	// 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
 }
 
-func staticHandler(w http.ResponseWriter, r *http.Request) {
-	name := r.URL.Path
-	b, ok := static.Files[name]
-	if !ok {
-		http.NotFound(w, r)
+// 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
 	}
-	http.ServeContent(w, r, name, time.Time{}, strings.NewReader(b))
+	s.ServeHTTP(w, r)
 }
diff --git a/blog/blog_test.go b/blog/blog_test.go
new file mode 100644
index 0000000..371d682
--- /dev/null
+++ b/blog/blog_test.go
@@ -0,0 +1,19 @@
+// Copyright 2018 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 (
+	"testing"
+
+	"golang.org/x/website/internal/webtest"
+)
+
+func TestServer(t *testing.T) {
+	h, err := blogHandler()
+	if err != nil {
+		t.Fatal(err)
+	}
+	webtest.TestHandler(t, "testdata/blog.txt", h)
+}
diff --git a/blog/cloudbuild.yaml b/blog/cloudbuild.yaml
index 3d6559d..12c65d7 100644
--- a/blog/cloudbuild.yaml
+++ b/blog/cloudbuild.yaml
@@ -8,8 +8,7 @@
     dir: blog
   - name: gcr.io/cloud-builders/gcloud
     entrypoint: bash
-    args: ["../go-app-deploy.sh", "app.yaml"]
-    dir: blog
+    args: ["./go-app-deploy.sh", "blog/app.yaml"]
   - name: mirror.gcr.io/library/golang
     args: [
       "go", "run", "./cmd/versionprune", "--dry_run=false",
diff --git a/blog/go.mod b/blog/go.mod
deleted file mode 100644
index 949db4e..0000000
--- a/blog/go.mod
+++ /dev/null
@@ -1,8 +0,0 @@
-module golang.org/x/website/blog
-
-go 1.11
-
-require (
-	golang.org/x/tools v0.1.1-0.20210427153610-6397a11608ad
-	golang.org/x/website v0.0.0-20200611220721-d72cde69aaaf
-)
diff --git a/blog/go.sum b/blog/go.sum
deleted file mode 100644
index 287ff4b..0000000
--- a/blog/go.sum
+++ /dev/null
@@ -1,296 +0,0 @@
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diff --git a/blog/local.go b/blog/local.go
deleted file mode 100644
index 82e3607..0000000
--- a/blog/local.go
+++ /dev/null
@@ -1,112 +0,0 @@
-// 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.
-
-// This file implements a stand-alone blog server.
-
-package main
-
-import (
-	"flag"
-	"log"
-	"net"
-	"net/http"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"strings"
-
-	"golang.org/x/tools/blog"
-)
-
-var (
-	httpAddr     = flag.String("http", "localhost:8080", "HTTP listen address")
-	contentPath  = flag.String("content", "_content/", "path to content files")
-	templatePath = flag.String("template", "_template/", "path to template files")
-	staticPath   = flag.String("static", "_static/", "path to static files")
-	websitePath  = flag.String("website", defaultWebsitePath(), "path to lib/godoc static files")
-	reload       = flag.Bool("reload", false, "reload content on each page load")
-)
-
-func defaultWebsitePath() string {
-	out, err := exec.Command("go", "list", "-f", "{{.Dir}}", "golang.org/x/website/content/static").CombinedOutput()
-	if err != nil {
-		log.Printf("warning: locating -website directory: %v", err)
-		return ""
-	}
-	dir := strings.TrimSpace(string(out))
-	return dir
-}
-
-// maybeStatic serves from one of the two static directories
-// (-static and -website) 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(*staticPath, p)
-			if _, err := os.Stat(f); err == nil {
-				http.ServeFile(w, r, f)
-				return
-			}
-		}
-		if strings.HasPrefix(p, "/lib/godoc/") {
-			f := filepath.Join(*websitePath, p[len("/lib/godoc/"):])
-			if _, err := os.Stat(f); err == nil {
-				http.ServeFile(w, r, f)
-				return
-			}
-		}
-		fallback.ServeHTTP(w, r)
-	}
-}
-
-func newServer(reload bool, config blog.Config) (http.Handler, error) {
-	mux := http.NewServeMux()
-	var h http.Handler
-	if reload {
-		h = http.HandlerFunc(reloadingBlogServer)
-	} else {
-		s, err := blog.NewServer(config)
-		if err != nil {
-			return nil, err
-		}
-		h = s
-	}
-	mux.Handle("/", maybeStatic(h))
-	return mux, nil
-}
-
-func main() {
-	flag.Parse()
-
-	if os.Getenv("GAE_ENV") == "standard" {
-		log.Println("running in App Engine Standard mode")
-		gaeMain()
-		return
-	}
-
-	config.ContentPath = *contentPath
-	config.TemplatePath = *templatePath
-	mux, err := newServer(*reload, config)
-	if err != nil {
-		log.Fatal(err)
-	}
-	ln, err := net.Listen("tcp", *httpAddr)
-	if err != nil {
-		log.Fatal(err)
-	}
-	log.Println("Listening on addr", *httpAddr)
-	log.Fatal(http.Serve(ln, mux))
-}
-
-// 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)
-}
diff --git a/blog/local_test.go b/blog/local_test.go
deleted file mode 100644
index b86f5c6..0000000
--- a/blog/local_test.go
+++ /dev/null
@@ -1,50 +0,0 @@
-// Copyright 2018 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.
-
-//go:build !appengine
-// +build !appengine
-
-package main
-
-import (
-	"net/http/httptest"
-	"os"
-	"runtime"
-	"strings"
-	"testing"
-
-	"golang.org/x/tools/blog"
-)
-
-func TestServer(t *testing.T) {
-	if runtime.GOOS == "android" {
-		t.Skip("skipping on android; can't run go tool")
-	}
-	if os.Getenv("GO_BUILDER_NAME") == "aix-ppc64" {
-		t.Skip("skipping on aix-ppc64 builder: https://golang.org/issue/33940")
-	}
-
-	oldStatic := *staticPath
-	*staticPath = "/static"
-	defer func() { *staticPath = oldStatic }()
-	mux, err := newServer(false, blog.Config{
-		TemplatePath: "./_template",
-	})
-	if err != nil {
-		t.Fatal(err)
-	}
-	r := httptest.NewRequest("GET", "/", nil)
-	w := httptest.NewRecorder()
-	mux.ServeHTTP(w, r)
-	if w.Code != 200 {
-		t.Errorf("GET /: code = %d; want 200", w.Code)
-	}
-	want := "The Go Programming Language Blog"
-	if !strings.Contains(w.Body.String(), want) {
-		t.Errorf("GET /: want to find %q, got\n\n%q", want, w.Body.String())
-	}
-	if hdr := w.Header().Get("Content-Type"); hdr != "text/html; charset=utf-8" {
-		t.Errorf("GET /: want text/html content-type, got %q", hdr)
-	}
-}
diff --git a/blog/rewrite.go b/blog/redirect.go
similarity index 94%
rename from blog/rewrite.go
rename to blog/redirect.go
index ecb3397..9acb2db 100644
--- a/blog/rewrite.go
+++ b/blog/redirect.go
@@ -4,19 +4,7 @@
 
 package main
 
-import "net/http"
-
-// Register HTTP handlers that redirect old blog paths to their new locations.
-func init() {
-	for p := range urlMap {
-		dest := "/" + urlMap[p]
-		http.HandleFunc(p, func(w http.ResponseWriter, r *http.Request) {
-			http.Redirect(w, r, dest, http.StatusMovedPermanently)
-		})
-	}
-}
-
-var urlMap = map[string]string{
+var redirects = map[string]string{
 	"/2010/03/go-whats-new-in-march-2010.html":               "go-whats-new-in-march-2010",
 	"/2010/04/json-rpc-tale-of-interfaces.html":              "json-rpc-tale-of-interfaces",
 	"/2010/04/third-party-libraries-goprotobuf-and.html":     "third-party-libraries-goprotobuf-and",
diff --git a/blog/testdata/blog.txt b/blog/testdata/blog.txt
new file mode 100644
index 0000000..2121356
--- /dev/null
+++ b/blog/testdata/blog.txt
@@ -0,0 +1,6 @@
+GET /
+body contains The Go Programming Language Blog
+header Content-Type == text/html; charset=utf-8
+
+GET /2010/08/defer-panic-and-recover.html
+redirect == /defer-panic-and-recover