feat: notifier

internal/pkg/core/notifier/providers/email/email.go

@@ -0,0 +1,69 @@
+package email
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/smtp"
+	"os"
+
+	"github.com/domodwyer/mailyak/v3"
+
+	"github.com/usual2970/certimate/internal/pkg/core/notifier"
+)
+
+type EmailNotifierConfig struct {
+	SmtpHost        string `json:"smtpHost"`
+	SmtpPort        int32  `json:"smtpPort"`
+	SmtpTLS         bool   `json:"smtpTLS"`
+	Username        string `json:"username"`
+	Password        string `json:"password"`
+	SenderAddress   string `json:"senderAddress"`
+	ReceiverAddress string `json:"receiverAddress"`
+}
+
+type EmailNotifier struct {
+	config *EmailNotifierConfig
+}
+
+var _ notifier.Notifier = (*EmailNotifier)(nil)
+
+func New(config *EmailNotifierConfig) (*EmailNotifier, error) {
+	if config == nil {
+		return nil, errors.New("config is nil")
+	}
+
+	return &EmailNotifier{
+		config: config,
+	}, nil
+}
+
+func (n *EmailNotifier) Notify(ctx context.Context, subject string, message string) (res *notifier.NotifyResult, err error) {
+	var smtpAuth smtp.Auth
+	if n.config.Username != "" || n.config.Password != "" {
+		smtpAuth = smtp.PlainAuth("", n.config.Username, n.config.Password, n.config.SmtpHost)
+	}
+
+	var yak *mailyak.MailYak
+	if n.config.SmtpTLS {
+		os.Setenv("GODEBUG", "tlsrsakex=1") // Fix for TLS handshake error
+		yak, err = mailyak.NewWithTLS(fmt.Sprintf("%s:%d", n.config.SmtpHost, n.config.SmtpPort), smtpAuth, nil)
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		yak = mailyak.New(fmt.Sprintf("%s:%d", n.config.SmtpHost, n.config.SmtpPort), smtpAuth)
+	}
+
+	yak.From(n.config.SenderAddress)
+	yak.To(n.config.ReceiverAddress)
+	yak.Subject(subject)
+	yak.Plain().Set(message)
+
+	err = yak.Send()
+	if err != nil {
+		return nil, err
+	}
+
+	return &notifier.NotifyResult{}, nil
+}