package main

import (
	"log"
	"net/http"
	"os"
)

// env returns the value of key or def when unset/empty.
func env(key, def string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return def
}

// envRequired returns the value of key or exits: a missing credential must
// fail loudly, never run with an open door.
func envRequired(key string) string {
	v := os.Getenv(key)
	if v == "" {
		log.Fatalf("mail-admin: %s is required (set it in mail-server/.env)", key)
	}
	return v
}

func main() {
	s := &server{
		accountsPath: envRequired("MAIL_ADMIN_ACCOUNTS"),
		quotaPath:    envRequired("MAIL_ADMIN_QUOTAS"),
		maildirRoot:  envRequired("MAIL_ADMIN_MAILDIR"),
		basePath:     env("MAIL_ADMIN_BASE_PATH", ""),
		user:         envRequired("MAIL_ADMIN_USER"),
		pass:         envRequired("MAIL_ADMIN_PASSWORD"),
	}
	addr := env("MAIL_ADMIN_LISTEN", ":8080")
	log.Printf("mail-admin listening on %s, base path %q", addr, s.basePath)
	log.Fatal(http.ListenAndServe(addr, s.handler()))
}