Initial commit: Open sourcing all of the Maple Open Technologies code.

cloud/maplepress-backend/internal/usecase/site/validate_domain.go

@@ -0,0 +1,46 @@
+package site
+
+import (
+	"context"
+
+	"go.uber.org/zap"
+
+	domainsite "codeberg.org/mapleopentech/monorepo/cloud/maplepress-backend/internal/domain/site"
+)
+
+// ValidateDomainUseCase checks if a domain is available for registration
+type ValidateDomainUseCase struct {
+	repo   domainsite.Repository
+	logger *zap.Logger
+}
+
+// ProvideValidateDomainUseCase creates a new ValidateDomainUseCase
+func ProvideValidateDomainUseCase(
+	repo domainsite.Repository,
+	logger *zap.Logger,
+) *ValidateDomainUseCase {
+	return &ValidateDomainUseCase{
+		repo:   repo,
+		logger: logger,
+	}
+}
+
+// Execute validates if a domain can be used for a new site
+func (uc *ValidateDomainUseCase) Execute(ctx context.Context, domain string) error {
+	// Check if domain already exists
+	exists, err := uc.repo.DomainExists(ctx, domain)
+	if err != nil {
+		uc.logger.Error("failed to check domain existence",
+			zap.String("domain", domain),
+			zap.Error(err))
+		return err
+	}
+
+	if exists {
+		uc.logger.Warn("domain already exists", zap.String("domain", domain))
+		return domainsite.ErrDomainAlreadyExists
+	}
+
+	uc.logger.Info("domain is available", zap.String("domain", domain))
+	return nil
+}