refactor: remove pocketbase (#1138)

app/mail/mail.go

@@ -0,0 +1,109 @@
+package mail
+
+import (
+	"cmp"
+	"context"
+	"fmt"
+	"log/slog"
+
+	"github.com/wneessen/go-mail"
+
+	"github.com/SecurityBrewery/catalyst/app/database/sqlc"
+	"github.com/SecurityBrewery/catalyst/app/settings"
+)
+
+type Mailer struct {
+	queries *sqlc.Queries
+}
+
+func New(queries *sqlc.Queries) *Mailer {
+	return &Mailer{
+		queries: queries,
+	}
+}
+
+func (m *Mailer) Send(ctx context.Context, to, subject, plainTextBody, htmlBody string) error {
+	settings, err := settings.Load(ctx, m.queries)
+	if err != nil {
+		return fmt.Errorf("failed to load settings: %w", err)
+	}
+
+	if !settings.SMTP.Enabled {
+		return fmt.Errorf("SMTP is not enabled in settings")
+	}
+
+	if settings.SMTP.Host == "" || settings.SMTP.Username == "" || settings.SMTP.Password == "" {
+		return fmt.Errorf("SMTP settings are not configured properly: host, username, and password must be set")
+	}
+
+	client, err := mailClient(settings)
+	if err != nil {
+		return fmt.Errorf("failed to create mail client: %w", err)
+	}
+
+	message, err := createMessage(settings, to, subject, plainTextBody, htmlBody)
+	if err != nil {
+		return fmt.Errorf("failed to create mail message: %w", err)
+	}
+
+	if err := client.DialAndSend(message); err != nil {
+		return fmt.Errorf("failed to deliver mail: %w", err)
+	}
+
+	slog.InfoContext(ctx, "mail sent successfully", "to", to, "subject", subject)
+
+	return nil
+}
+
+func createMessage(settings *settings.Settings, to string, subject string, plainTextBody, htmlBody string) (*mail.Msg, error) {
+	message := mail.NewMsg()
+
+	if err := message.FromFormat(settings.Meta.SenderName, settings.Meta.SenderAddress); err != nil {
+		return nil, fmt.Errorf("failed to set FROM address: %w", err)
+	}
+
+	if err := message.To(to); err != nil {
+		return nil, fmt.Errorf("failed to set TO address: %w", err)
+	}
+
+	message.Subject(subject)
+	message.SetBodyString(mail.TypeTextPlain, plainTextBody)
+
+	if htmlBody != "" {
+		message.SetBodyString(mail.TypeTextHTML, htmlBody)
+	}
+
+	return message, nil
+}
+
+func mailClient(settings *settings.Settings) (*mail.Client, error) {
+	var authType mail.SMTPAuthType
+	if err := authType.UnmarshalString(cmp.Or(settings.SMTP.AuthMethod, "plain")); err != nil {
+		return nil, fmt.Errorf("failed to parse SMTP auth method: %w", err)
+	}
+
+	opts := []mail.Option{
+		mail.WithSMTPAuth(authType),
+		mail.WithUsername(settings.SMTP.Username),
+		mail.WithPassword(settings.SMTP.Password),
+	}
+
+	if settings.SMTP.Port != 0 {
+		opts = append(opts, mail.WithPort(settings.SMTP.Port))
+	}
+
+	if settings.SMTP.TLS {
+		opts = append(opts, mail.WithSSL())
+	}
+
+	if settings.SMTP.LocalName != "" {
+		opts = append(opts, mail.WithHELO(settings.SMTP.LocalName))
+	}
+
+	client, err := mail.NewClient(settings.SMTP.Host, opts...)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create new mail delivery client: %w", err)
+	}
+
+	return client, nil
+}