feat: 0.0.1

internal/mailer/gmail.go

@@ -0,0 +1,72 @@
+package mailer
+
+import (
+	"bytes"
+	"fmt"
+	"net/smtp"
+	"text/template"
+
+	"github.com/jordan-wright/email"
+)
+
+const (
+	smtpAuthAddress   = "smtp.gmail.com"
+	smtpServerAddress = "smtp.gmail.com:587"
+)
+
+type GmailSender struct {
+	name              string
+	fromEmailAddress  string
+	fromEmailPassword string
+}
+
+func NewGmailSender(name, fromEmailAddress, fromEmailPassword string) MailSender {
+	return &GmailSender{
+		name:              name,
+		fromEmailAddress:  fromEmailAddress,
+		fromEmailPassword: fromEmailPassword,
+	}
+}
+
+func (s *GmailSender) Send(
+	mailTemplate string,
+	vars any,
+	to []string,
+	cc []string,
+	bcc []string,
+	attachFiles []string,
+) error {
+	e := email.NewEmail()
+	e.From = fmt.Sprintf("%s <%s>", s.name, s.fromEmailAddress)
+	e.To = to
+	e.Cc = cc
+	e.Bcc = bcc
+
+	tmpl, err := template.ParseFS(FS, "templates/"+mailTemplate)
+	if err != nil {
+		return fmt.Errorf("failed to parse email template: %w", err)
+	}
+
+	subject := new(bytes.Buffer)
+	if err := tmpl.ExecuteTemplate(subject, "subject", vars); err != nil {
+		return fmt.Errorf("failed to execute subject template: %w", err)
+	}
+
+	body := new(bytes.Buffer)
+	if err := tmpl.ExecuteTemplate(body, "body", vars); err != nil {
+		return fmt.Errorf("failed to execute body template: %w", err)
+	}
+
+	e.Subject = subject.String()
+	e.HTML = body.Bytes()
+
+	for _, file := range attachFiles {
+		_, err := e.AttachFile(file)
+		if err != nil {
+			return fmt.Errorf("failed to attach file %s: %w", file, err)
+		}
+	}
+
+	smtpAuth := smtp.PlainAuth("", s.fromEmailAddress, s.fromEmailPassword, smtpAuthAddress)
+	return e.Send(smtpServerAddress, smtpAuth)
+}