Initial commit

mailer.go

@@ -0,0 +1,69 @@
+package emailing
+
+import (
+	"bytes"
+	"fmt"
+	"html/template"
+
+	"github.com/spf13/viper"
+	gomail "gopkg.in/mail.v2"
+)
+
+type Mailer struct {
+	TemplatesDir    string
+	TemplatesConfig *viper.Viper
+	SMTPConfig
+}
+
+type SMTPConfig struct {
+	Host     string
+	Port     int
+	Username string
+	Password string
+}
+
+func NewMailer(templates_dir string, tplcfg *viper.Viper, smtpconfig *viper.Viper) (*Mailer, error) {
+	return &Mailer{
+		TemplatesDir:    templates_dir,
+		TemplatesConfig: tplcfg,
+		SMTPConfig: SMTPConfig{
+			Host:     smtpconfig.GetString("host"),
+			Port:     smtpconfig.GetInt("port"),
+			Username: smtpconfig.GetString("username"),
+			Password: smtpconfig.GetString("password"),
+		},
+	}, nil
+}
+
+func (m *Mailer) Send(emailcfg string, to string, data any) error {
+	cfg := m.TemplatesConfig.Sub(emailcfg)
+
+	files := cfg.GetStringSlice("files")
+	prefixed_files := []string{}
+	for _, f := range files {
+		prefixed_files = append(prefixed_files, m.TemplatesDir+f)
+	}
+	t := template.Must(template.ParseFiles(prefixed_files...))
+	buf := new(bytes.Buffer)
+	if err := t.ExecuteTemplate(buf, "main", data); err != nil {
+		return err
+	}
+	body := buf.String()
+
+	fmt.Println(body)
+
+	message := gomail.NewMessage()
+
+	message.SetHeader("From", m.SMTPConfig.Username)
+	message.SetHeader("To", to)
+	message.SetHeader("Subject", cfg.GetString("subject"))
+	message.SetBody("text/html", body)
+
+	d := gomail.NewDialer(m.SMTPConfig.Host, m.SMTPConfig.Port, m.SMTPConfig.Username, m.SMTPConfig.Password)
+	if err := d.DialAndSend(message); err != nil {
+		return err
+	}
+
+	return nil
+
+}