Added tool for sending emails

.travis.yml

@@ -8,6 +8,7 @@ install:
 - go get github.com/jinzhu/gorm
 - go get github.com/Sirupsen/logrus
 - go get gopkg.in/natefinch/lumberjack.v2
+- go get gopkg.in/gomail.v2
 - go build
 deploy:
   provider: releases

config/email.go

@@ -0,0 +1,15 @@
+package config
+
+import "time"
+
+const (
+	SendEmail     = true
+	EmailFrom     = "donotrespond@nyaa.pantsu.cat"
+	EmailTestTo   = ""
+	EmailHost     = "localhost"
+	EmailUsername = ""
+	EmailPassword = ""
+	EmailPort     = 465
+	// EmailTimeout  = 80 * time.Millisecond
+	EmailTimeout = 10 * time.Second
+)

util/email/email.go

@@ -0,0 +1,65 @@
+package email
+
+import (
+	"errors"
+	"path/filepath"
+	"sync/atomic"
+	"time"
+
+	"github.com/ewhal/nyaa/config"
+	"github.com/ewhal/nyaa/util/log"
+	gomail "gopkg.in/gomail.v2"
+)
+
+type EmailError error
+
+var (
+	mailer                 = InitGomail()
+)
+
+func InitGomail() *gomail.Mailer {
+	mailer := gomail.NewMailer(config.EmailHost, config.EmailUsername, config.EmailPassword, config.EmailPort)
+	return mailer
+}
+
+func SendEmailFromAdmin(to string, subject string, body string, bodyHTML string) error {
+	msg := gomail.NewMessage()
+	msg.SetHeader("From", config.EmailFrom)
+	msg.SetHeader("To", to, config.EmailTestTo)
+	msg.SetHeader("Subject", subject)
+	msg.SetBody("text/plain", body)
+	msg.AddAlternative("text/html", bodyHTML)
+	log.Debugf("to : %s", to)
+	log.Debugf("subject : %s", subject)
+	log.Debugf("body : %s", body)
+	log.Debugf("bodyHTML : %s", bodyHTML)
+	if config.SendEmail {
+		log.Debug("SendEmail performed.")
+
+		err := mailer.DialAndSend(msg); 
+		return err
+	}
+	return nil
+}
+
+func SendTestEmail() error {
+	msg := gomail.NewMessage()
+	msg.SetHeader("From", config.EmailFrom)
+	msg.SetHeader("To", config.EmailTestTo)
+	msg.SetAddressHeader("Cc", config.EmailTestTo, "NyaaPantsu")
+	msg.SetHeader("Subject", "Hi(안녕하세요)?!")
+	msg.SetBody("text/plain", "Hi(안녕하세요)?!")
+	msg.AddAlternative("text/html", "<p><b>Nowplay(나우플레이)</b> means <i>Let's play</i>!!?</p>")
+	path, err := filepath.Abs("img/megumin.png")
+	if err != nil {
+		panic(err)
+	}
+	f, err := gomail.OpenFile(path)
+	if err != nil {
+		panic(err)
+	}
+	msg.Attach(f)
+	// SendEmail(msg)
+		err := mailer.DialAndSend(msg); 
+	return err
+}