UPDATE: Auth module, User module

pkg/email/email.go

@@ -0,0 +1,70 @@
+package email
+
+import (
+	"fmt"
+	"history-api/assets"
+	"history-api/pkg/config"
+	"history-api/pkg/constants"
+	"strings"
+
+	"github.com/wneessen/go-mail"
+)
+
+func SendMailOTP(toEmail, otpCode string, tokenType constants.TokenType) error {
+	userSmtp, err := config.GetConfig("SMTP_USER")
+	if err != nil {
+		return err
+	}
+
+	passSmtp, err := config.GetConfig("SMTP_PASS")
+	if err != nil {
+		return err
+	}
+
+	var subject string
+	var templatePath string
+
+	switch tokenType {
+	case constants.TokenPasswordReset:
+		subject = "Your Password Reset Code"
+		templatePath = "resources/password_reset.html"
+	case constants.TokenEmailVerify:
+		subject = "Verify your email address"
+		templatePath = "resources/email_verify.html"
+	default:
+		return fmt.Errorf("invalid token type: %v", tokenType)
+	}
+	htmlTemplate, err := assets.GetFileContent(templatePath)
+	if err != nil {
+		return fmt.Errorf("failed to read email template: %s", err)
+	}
+
+	message := mail.NewMsg()
+	if err := message.From(userSmtp); err != nil {
+		return fmt.Errorf("failed to set From email address: %s", err)
+	}
+	if err := message.To(toEmail); err != nil {
+		return fmt.Errorf("failed to set To email address: %s", err)
+	}
+
+	finalHTML := strings.ReplaceAll(htmlTemplate, "{{OTP_CODE}}", otpCode)
+
+	message.Subject(subject)
+	message.SetBodyString(mail.TypeTextHTML, finalHTML)
+	client, err := mail.NewClient(
+		"smtp.gmail.com",
+		mail.WithSMTPAuth(mail.SMTPAuthAutoDiscover),
+		mail.WithTLSPortPolicy(mail.TLSMandatory),
+		mail.WithUsername(userSmtp),
+		mail.WithPassword(passSmtp),
+	)
+	if err != nil {
+		return fmt.Errorf("failed to create mail client: %s", err)
+	}
+
+	err = client.DialAndSend(message)
+	if err != nil {
+		return fmt.Errorf("failed to send mail: %s", err)
+	}
+	return nil
+}