Bumping k8s dependencies to 1.13

vendor/golang.org/x/tools/cmd/present/main.go

@@ -0,0 +1,150 @@
+// 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 (
+	"flag"
+	"fmt"
+	"go/build"
+	"log"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+
+	"golang.org/x/tools/present"
+)
+
+const basePkg = "golang.org/x/tools/cmd/present"
+
+var (
+	httpAddr      = flag.String("http", "127.0.0.1:3999", "HTTP service address (e.g., '127.0.0.1:3999')")
+	originHost    = flag.String("orighost", "", "host component of web origin URL (e.g., 'localhost')")
+	basePath      = flag.String("base", "", "base path for slide template and static resources")
+	contentPath   = flag.String("content", ".", "base path for presentation content")
+	usePlayground = flag.Bool("use_playground", false, "run code snippets using play.golang.org; if false, run them locally and deliver results by WebSocket transport")
+	nativeClient  = flag.Bool("nacl", false, "use Native Client environment playground (prevents non-Go code execution) when using local WebSocket transport")
+)
+
+func main() {
+	flag.BoolVar(&present.PlayEnabled, "play", true, "enable playground (permit execution of arbitrary user code)")
+	flag.BoolVar(&present.NotesEnabled, "notes", false, "enable presenter notes (press 'N' from the browser to display them)")
+	flag.Parse()
+
+	if os.Getenv("GAE_ENV") == "standard" {
+		log.Print("Configuring for App Engine Standard")
+		port := os.Getenv("PORT")
+		if port == "" {
+			port = "8080"
+		}
+		*httpAddr = fmt.Sprintf("0.0.0.0:%s", port)
+		pwd, err := os.Getwd()
+		if err != nil {
+			log.Fatalf("Couldn't get pwd: %v\n", err)
+		}
+		*basePath = pwd
+		*usePlayground = true
+		*contentPath = "./content/"
+	}
+
+	if *basePath == "" {
+		p, err := build.Default.Import(basePkg, "", build.FindOnly)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Couldn't find gopresent files: %v\n", err)
+			fmt.Fprintf(os.Stderr, basePathMessage, basePkg)
+			os.Exit(1)
+		}
+		*basePath = p.Dir
+	}
+	err := initTemplates(*basePath)
+	if err != nil {
+		log.Fatalf("Failed to parse templates: %v", err)
+	}
+
+	ln, err := net.Listen("tcp", *httpAddr)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer ln.Close()
+
+	_, port, err := net.SplitHostPort(ln.Addr().String())
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	origin := &url.URL{Scheme: "http"}
+	if *originHost != "" {
+		origin.Host = net.JoinHostPort(*originHost, port)
+	} else if ln.Addr().(*net.TCPAddr).IP.IsUnspecified() {
+		name, _ := os.Hostname()
+		origin.Host = net.JoinHostPort(name, port)
+	} else {
+		reqHost, reqPort, err := net.SplitHostPort(*httpAddr)
+		if err != nil {
+			log.Fatal(err)
+		}
+		if reqPort == "0" {
+			origin.Host = net.JoinHostPort(reqHost, port)
+		} else {
+			origin.Host = *httpAddr
+		}
+	}
+
+	initPlayground(*basePath, origin)
+	http.Handle("/static/", http.FileServer(http.Dir(*basePath)))
+
+	if !ln.Addr().(*net.TCPAddr).IP.IsLoopback() &&
+		present.PlayEnabled && !*nativeClient && !*usePlayground {
+		log.Print(localhostWarning)
+	}
+
+	log.Printf("Open your web browser and visit %s", origin.String())
+	if present.NotesEnabled {
+		log.Println("Notes are enabled, press 'N' from the browser to display them.")
+	}
+	log.Fatal(http.Serve(ln, nil))
+}
+
+func environ(vars ...string) []string {
+	env := os.Environ()
+	for _, r := range vars {
+		k := strings.SplitAfter(r, "=")[0]
+		var found bool
+		for i, v := range env {
+			if strings.HasPrefix(v, k) {
+				env[i] = r
+				found = true
+			}
+		}
+		if !found {
+			env = append(env, r)
+		}
+	}
+	return env
+}
+
+const basePathMessage = `
+By default, gopresent locates the slide template files and associated
+static content by looking for a %q package
+in your Go workspaces (GOPATH).
+
+You may use the -base flag to specify an alternate location.
+`
+
+const localhostWarning = `
+WARNING!  WARNING!  WARNING!
+
+The present server appears to be listening on an address that is not localhost
+and is configured to run code snippets locally. Anyone with access to this address
+and port will have access to this machine as the user running present.
+
+To avoid this message, listen on localhost, run with -play=false, or run with
+-play_socket=false.
+
+If you don't understand this message, hit Control-C to terminate this process.
+
+WARNING!  WARNING!  WARNING!
+`