Write nginx configs from combined cert/pem files

do.go

package main

import (
	"crypto/md5"
	"crypto/x509"
	"encoding/pem"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"path/filepath"
)

func main() {
	for _, certificate := range os.Args[1:] {
		const nginx_template = `
server {

        listen   443;
        server_name %s;

        root /usr/share/nginx/www;
        index index.html index.htm;

        ssl on;
        ssl_certificate %s;
        ssl_certificate_key %s;
        location / {
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_pass http://localhost:8000;
        }
}
`

		txt, err := ioutil.ReadFile(certificate)
		if err != nil {
			log.Fatal(err)
		}

		key_data, rest := pem.Decode(txt)
		cert_data, rest := pem.Decode(rest)
		cert, err := x509.ParseCertificate(cert_data.Bytes)
		domain := cert.DNSNames[0]
		basename := fmt.Sprintf("%x", md5.Sum([]byte(domain)))
		if err != nil {
			log.Fatal(err)
		}

		if err != nil {
			log.Fatal(err)
		}

		config_name := basename + ".conf"
		cert_name := basename + ".crt"
		key_name := basename + ".key"
		ioutil.WriteFile(cert_name, pem.EncodeToMemory(cert_data), 0600)
		ioutil.WriteFile(key_name, pem.EncodeToMemory(key_data), 0600)
		cert_name, err = filepath.Abs(cert_name)
		key_name, err = filepath.Abs(key_name)
		ioutil.WriteFile(config_name, []byte(fmt.Sprintf(nginx_template, domain, cert_name, key_name)), 0600)
	}
}