initiall commit

apps/backend/internal/services/mailer.go

@@ -0,0 +1,63 @@
+package services
+
+import (
+	"context"
+	"fmt"
+	"net/smtp"
+	"strings"
+
+	"github.com/resend/resend-go/v2"
+
+	"github.com/tdvorak/primora/apps/backend/internal/config"
+)
+
+type Mailer struct {
+	cfg    config.Config
+	resend *resend.Client
+}
+
+func NewMailer(cfg config.Config) *Mailer {
+	var resendClient *resend.Client
+	if cfg.ResendAPIKey != "" {
+		resendClient = resend.NewClient(cfg.ResendAPIKey)
+	}
+	return &Mailer{cfg: cfg, resend: resendClient}
+}
+
+func (m *Mailer) SendInvitation(ctx context.Context, toEmail, organizationName, inviteURL string) error {
+	subject := fmt.Sprintf("You were invited to %s on Primora", organizationName)
+	text := "You have been invited to Primora.\n\nOpen this link to accept the invitation:\n" + inviteURL + "\n"
+	if m.resend != nil {
+		_, err := m.resend.Emails.SendWithContext(ctx, &resend.SendEmailRequest{
+			From:    m.cfg.MailFrom,
+			To:      []string{toEmail},
+			Subject: subject,
+			Text:    text,
+		})
+		return err
+	}
+	address := fmt.Sprintf("%s:%d", m.cfg.SMTPHost, m.cfg.SMTPPort)
+	message := strings.Join([]string{
+		"From: " + m.cfg.MailFrom,
+		"To: " + toEmail,
+		"Subject: " + subject,
+		"MIME-Version: 1.0",
+		"Content-Type: text/plain; charset=utf-8",
+		"",
+		text,
+	}, "\r\n")
+	var auth smtp.Auth
+	if m.cfg.SMTPUser != "" {
+		auth = smtp.PlainAuth("", m.cfg.SMTPUser, m.cfg.SMTPPassword, m.cfg.SMTPHost)
+	}
+	return smtp.SendMail(address, auth, extractEmail(m.cfg.MailFrom), []string{toEmail}, []byte(message))
+}
+
+func extractEmail(input string) string {
+	if start := strings.Index(input, "<"); start >= 0 {
+		if end := strings.Index(input, ">"); end > start {
+			return input[start+1 : end]
+		}
+	}
+	return input
+}