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internal/customerauth/mail_notifier.go

@@ -0,0 +1,86 @@
+package customerauth
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net/mail"
+	"strings"
+	"time"
+
+	"github.com/mailersend/mailersend-go"
+)
+
+// MailerSendNotifier delivers transactional auth messages (email verification
+// and password reset) through the MailerSend API. It implements the Notifier
+// interface and is a drop-in replacement for LogNotifier in production.
+type MailerSendNotifier struct {
+	client *mailersend.Mailersend
+	from   mail.Address
+}
+
+// NewMailerSendNotifier creates a new MailerSend-backed notifier. The apiKey
+// is the MailerSend API token (MAILERSEND_API_KEY env var). The from address
+// must include at least an email; the name portion is optional.
+func NewMailerSendNotifier(apiKey string, from mail.Address) (*MailerSendNotifier, error) {
+	if strings.TrimSpace(apiKey) == "" {
+		return nil, fmt.Errorf("mailersend notifier: missing API key")
+	}
+	if strings.TrimSpace(from.Address) == "" {
+		return nil, fmt.Errorf("mailersend notifier: missing from address")
+	}
+	return &MailerSendNotifier{
+		client: mailersend.NewMailersend(apiKey),
+		from:   from,
+	}, nil
+}
+
+// SendEmailVerification sends the verification link to the customer's email
+// address. Errors are logged but not returned (best-effort delivery matches the
+// signature of the Notifier interface).
+func (n *MailerSendNotifier) SendEmailVerification(email, link string) {
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+	if err := n.send(ctx, email,
+		"Verify your email address",
+		fmt.Sprintf("Click the link to verify your email address:\n\n%s", link),
+		fmt.Sprintf(`<p>Click <a href="%s">here</a> to verify your email address.</p>`, link),
+	); err != nil {
+		log.Printf("customerauth: send verification to %s: %v", email, err)
+	}
+}
+
+// SendPasswordReset sends the password-reset link to the customer's email.
+// Errors are logged but not returned.
+func (n *MailerSendNotifier) SendPasswordReset(email, link string) {
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+	if err := n.send(ctx, email,
+		"Reset your password",
+		fmt.Sprintf("Click the link to reset your password:\n\n%s\n\nIf you didn't request this, ignore this email.", link),
+		fmt.Sprintf(`<p>Click <a href="%s">here</a> to reset your password.</p><p>If you didn't request this, ignore this email.</p>`, link),
+	); err != nil {
+		log.Printf("customerauth: send password reset to %s: %v", email, err)
+	}
+}
+
+func (n *MailerSendNotifier) send(ctx context.Context, to, subject, textBody, htmlBody string) error {
+	message := n.client.Email.NewMessage()
+	message.SetFrom(mailersend.From{
+		Name:  n.from.Name,
+		Email: n.from.Address,
+	})
+	message.SetRecipients([]mailersend.Recipient{
+		{Email: to},
+	})
+	message.SetSubject(subject)
+	message.SetText(textBody)
+	if htmlBody != "" {
+		message.SetHTML(htmlBody)
+	}
+	_, err := n.client.Email.Send(ctx, message)
+	if err != nil {
+		return fmt.Errorf("mailersend: %w", err)
+	}
+	return nil
+}