servetls/main.go

package main

import (
	"fmt"
	"net/http"
	"os"
	"strconv"
)

const usage = "servetls <cert file> <key file>"

func main() {
	if len(os.Args) != 3 {
		fmt.Fprintf(os.Stderr, "%s\n", usage)
		os.Exit(1)
	}
	cert, key := os.Args[1], os.Args[2]

	http.HandleFunc("/", handler)

	port := 8443
	if os.Getenv("PORT") != "" {
		p, err := strconv.Atoi(os.Getenv("PORT"))
		if err != nil {
			fmt.Fprintf(os.Stderr, "could not parse PORT variable: %s\n", os.Getenv("PORT"))
			os.Exit(1)
		}
		port = p
	}
	addr := fmt.Sprintf(":%d", port)
	fmt.Printf("serving on %s", addr)
	err := http.ListenAndServeTLS(addr, cert, key, nil)
	if err != nil {
		fmt.Fprintf(os.Stderr, "%v\n", err)
		os.Exit(1)
	}
}

func handler(w http.ResponseWriter, req *http.Request) {
	fmt.Fprintf(w, "if you see this without complaints things are likely set up correctly\n")
}