Initial commit

notifications/email/email.go

@@ -0,0 +1,71 @@
+package email
+
+import (
+	"errors"
+	"fmt"
+	"net/smtp"
+	"strings"
+)
+
+type (
+	Sender struct {
+		SMTPServer string
+		Login      string
+		Password   string
+	}
+
+	Notificator struct {
+		Sender Sender
+		Groups map[string][]string
+	}
+)
+
+func NewNotificator(smtp, login, password string) *Notificator {
+	return &Notificator{
+		Sender: Sender{
+			SMTPServer: smtp,
+			Login:      login,
+			Password:   password,
+		},
+		Groups: make(map[string][]string),
+	}
+}
+
+func (n *Notificator) AddGroup(name string, addresses []string) {
+	n.Groups[name] = addresses
+}
+
+func (n Notificator) Send(group, sub, body string) error {
+	receivers, ok := n.Groups[group]
+	if !ok {
+		return errors.New("unknown group")
+	}
+	return n.Sender.SendMail(receivers, sub, body)
+}
+
+func (s Sender) SendMail(to []string, subj, body string) error {
+	toTxt := fmt.Sprintf("To: %s\r\n", strings.Join(to, ";"))
+	subjTxt := fmt.Sprintf("Subject: %s\r\n", subj)
+	mimeTxt := "MIME-version: 1.0;\r\nContent-Type: text/html; charset=\"UTF-8\";\r\n\r\n"
+	bodyTxt := fmt.Sprintf("%s\r\n", body)
+	mailTxt := toTxt + subjTxt + mimeTxt + bodyTxt
+	return smtp.SendMail(s.SMTPServer, s, s.Login, to, []byte(mailTxt))
+}
+
+func (s Sender) Start(_ *smtp.ServerInfo) (string, []byte, error) {
+	return "LOGIN", []byte{}, nil
+}
+
+func (s Sender) Next(fromServer []byte, more bool) ([]byte, error) {
+	if more {
+		switch str := string(fromServer); str {
+		case "Username:":
+			return []byte(s.Login), nil
+		case "Password:":
+			return []byte(s.Password), nil
+		default:
+			return nil, fmt.Errorf("unknown fromServer %s", str)
+		}
+	}
+	return nil, nil
+}