authorizer/server/email/mailgun.go

package email

import (
	"context"
	"fmt"
	"os"
	"time"

	mailgun "github.com/mailgun/mailgun-go/v4"

	log "github.com/sirupsen/logrus"

	"github.com/authorizerdev/authorizer/server/constants"
)

const apiURL = "https://api.mailgun.net/v3/%s/messages"

func MailgunRest(to string, data map[string]interface{}, subject string, template string) error {
	var mailgunAPIKey = os.Getenv("MAILGUN_API_KEY")
	var mailgunDomain = os.Getenv("MAILGUN_DOMAIN")
	sender := mailgunDomain + "<noreply@" + mailgunDomain + ">"
	log.Printf("%r", data)
	mg := mailgun.NewMailgun(mailgunDomain, mailgunAPIKey)
	m := mg.NewMessage(sender, subject, "", to)
	m.SetTemplate(template)
	m.AddTemplateVariable("verification_url", data["verification_url"])
	userMap, ok := data["user"].(map[string]interface{})
	if !ok {
		log.Println("Error: Unable to retrieve user information from the data map.")
	}
	userName, ok := userMap["GivenName"].(string)
	if ok {
		m.AddTemplateVariable("username", userName)
	}

	ctx, cancel := context.WithTimeout(context.Background(), time.Second*30)
	defer cancel()

	resp, id, err := mg.Send(ctx, m)

	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("ID: %s Resp: %s\n", id, resp)

	return err
}

// SendMailgun function to send
func SendMailgun(to []string, event string, data map[string]interface{}) error {
	template := "email_confirmation"

	switch event {
	case constants.VerificationTypeBasicAuthSignup:
		template = "email_confirmation_ru"
	case constants.VerificationTypeForgotPassword:
		template = "password_reset"
	case constants.VerificationTypeInviteMember:
		template = "author_invited"
	case constants.VerificationTypeMagicLinkLogin:
		template = "magic_link_login"
	case constants.VerificationTypeOTP:
		template = "one_time_password"
	case constants.VerificationTypeUpdateEmail:
		template = "email_update"
	}

	subject := "Подтверждение почты"

	// TODO: language selection logic here

	err := MailgunRest(to[0], data, subject, template)

	// Log the response
	if err != nil {
		log.Printf("Error sending email: %v", err)
	} else {
		log.Println("Email sent successfully")
	}

	return err
}