basic common app packages

email/transport_smtp.go

@@ -0,0 +1,89 @@
+// Copyright 2024 Patial Tech (Ankit Patial).
+// All rights reserved.
+
+package email
+
+import (
+	"fmt"
+	"log/slog"
+	"strings"
+
+	"code.patial.tech/go/appcore/email/gomail"
+	"code.patial.tech/go/appcore/uid"
+)
+
+// SMTP mailer
+type SMTP struct {
+	Host     string
+	Port     int
+	Username string
+	Password string
+	// Domain name for smtp
+	Domain string
+}
+
+func (t SMTP) Send(msg *Message) error {
+	slog.Info("sending mail", slog.String("smtp", t.Host))
+	// validate msg
+	if err := msg.Validate(); err != nil {
+		return err
+	}
+
+	toCount := len(msg.To)
+	m := gomail.NewMessage()
+	if msg.ID != "" {
+		m.SetHeader("Message-ID", fmt.Sprintf("<%s>", msg.ID))
+	} else {
+		uid, err := uid.NewUUID()
+		if err != nil {
+			return err
+		}
+
+		id := strings.Replace(uid, "-", "", -1)
+		msgID := fmt.Sprintf("<autogen-%s@%s>", id, t.Domain)
+		m.SetHeader("Message-ID", msgID)
+	}
+
+	m.SetHeader("From", msg.From)
+
+	// TO
+	to := make([]string, toCount)
+	for i, address := range msg.To {
+		to[i] = address.String()
+	}
+	m.SetHeader("To", to...)
+
+	// subject
+	m.SetHeader("Subject", msg.Subject)
+
+	// CC
+	ccCount := len(msg.Cc)
+	if ccCount > 0 {
+		cc := make([]string, ccCount)
+		for i, address := range msg.Cc {
+			cc[i] = address.String()
+		}
+		m.SetHeader("Cc", cc...)
+	}
+
+	// BCC
+	bccCount := len(msg.Bcc)
+	if bccCount > 0 {
+		bcc := make([]string, bccCount)
+		for i, address := range msg.Bcc {
+			bcc[i] = address.String()
+		}
+		m.SetHeader("Bcc", bcc...)
+	}
+
+	m.SetBody("text/html", msg.HtmlBody)
+
+	slog.Info("dialing...", slog.String("host", t.Host), slog.Int("port", t.Port))
+	d := gomail.NewDialer(t.Host, t.Port, t.Username, t.Password)
+	if err := d.DialAndSend(m); err != nil {
+		return err
+	}
+
+	slog.Info("sent email %s" + msg.Subject)
+	return nil
+}