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// Copyright 2017 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 server serves get.golang.org, redirecting users to the appropriate
// getgo installer based on the request path.
package main
import (
"fmt"
"net/http"
"os"
"strings"
"time"
)
const (
base = "https://dl.google.com/go/getgo/"
windowsInstaller = base + "installer.exe"
linuxInstaller = base + "installer_linux"
macInstaller = base + "installer_darwin"
)
// substring-based redirects.
var stringMatch = map[string]string{
// via uname, from bash
"MINGW": windowsInstaller, // Reported as MINGW64_NT-10.0 in git bash
"Linux": linuxInstaller,
"Darwin": macInstaller,
}
func main() {
http.HandleFunc("/", handler)
port := os.Getenv("PORT")
if port == "" {
port = "8080"
fmt.Printf("Defaulting to port %s", port)
}
fmt.Printf("Listening on port %s", port)
if err := http.ListenAndServe(fmt.Sprintf(":%s", port), nil); err != nil {
fmt.Fprintf(os.Stderr, "http.ListenAndServe: %v", err)
}
}
func handler(w http.ResponseWriter, r *http.Request) {
if containsIgnoreCase(r.URL.Path, "installer.exe") {
// cache bust
http.Redirect(w, r, windowsInstaller+cacheBust(), http.StatusFound)
return
}
for match, redirect := range stringMatch {
if containsIgnoreCase(r.URL.Path, match) {
http.Redirect(w, r, redirect, http.StatusFound)
return
}
}
http.NotFound(w, r)
}
func containsIgnoreCase(s, substr string) bool {
return strings.Contains(
strings.ToLower(s),
strings.ToLower(substr),
)
}
func cacheBust() string {
return fmt.Sprintf("?%d", time.Now().Nanosecond())
}
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