backup/email.go

package main

import (
	"encoding/base64"
	"log"
	"net/smtp"
	"strings"
	"time"
)

type Email struct {
	startTime time.Time
	items     []string
}

type EmailConfig struct {
	SmtpHost  string   `json:"smtp"`
	FromEmail string   `json:"email_from"`
	ToEmail   []string `json:"email_to"`
}

func SendMail(addr, from, subject, body string, to []string) error {
	if *debugFlag {
		log.Printf("SendMail : Start")
	}
	r := strings.NewReplacer("\r\n", "", "\r", "", "\n", "", "%0a", "", "%0d", "")

	c, err := smtp.Dial(addr)
	if err != nil {
		if *debugFlag {
			log.Printf("SendMail : %s : smtp.Dial (%s)", addr, err)
		}
		return err
	}

	defer c.Close()

	if err = c.Mail(r.Replace(from)); err != nil {
		if *debugFlag {
			log.Printf("SendMail : %s : client.Mail (%s)", from, err)
		}
		return err
	}

	for i := range to {
		to[i] = r.Replace(to[i])
		if err = c.Rcpt(to[i]); err != nil {
			if *debugFlag {
				log.Printf("SendMail : %s : client.Rcpt (%s)", to[i], err)
			}
			return err
		}
	}

	w, err := c.Data()
	if err != nil {
		if *debugFlag {
			log.Printf("SendMail : client.Data (%s)", err)
		}
		return err
	}

	msg := "Date: " + time.Now().Format("Mon, 02 Jan 2006 15:04:05 -0700") + "\r\n" +
		"To: " + strings.Join(to, ",") + "\r\n" +
		"From: " + from + "\r\n" +
		"Subject: " + subject + "\r\n" +
		"Content-Type: text/plain; charset=\"UTF-8\"\r\n" +
		"Content-Transfer-Encoding: base64\r\n" +
		"\r\n" + base64.StdEncoding.EncodeToString([]byte(body))

	if *debugFlag {
		log.Printf("SendMail :\r\n%s", msg)
	}

	_, err = w.Write([]byte(msg))
	if err != nil {
		if *debugFlag {
			log.Printf("SendMail : writer.Write (%s)", err)
		}
		return err
	}

	err = w.Close()
	if err != nil {
		if *debugFlag {
			log.Printf("SendMail : writer.Close (%s)", err)
		}
		return err
	}

	err = c.Quit()
	if *debugFlag {
		log.Printf("SendMail : client.Quit (%s)", err)
	}
	return err
}