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

cloud/maplefile-backend/internal/usecase/filemetadata/anonymize_user_references.go

@@ -0,0 +1,89 @@
+// codeberg.org/mapleopentech/monorepo/cloud/maplefile-backend/internal/usecase/filemetadata/anonymize_user_references.go
+package filemetadata
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/gocql/gocql"
+	"go.uber.org/zap"
+
+	dom_file "codeberg.org/mapleopentech/monorepo/cloud/maplefile-backend/internal/domain/file"
+)
+
+// AnonymizeUserReferencesUseCase handles anonymizing CreatedByUserID and ModifiedByUserID
+// references when a user is deleted, replacing them with a special "deleted user" UUID.
+type AnonymizeUserReferencesUseCase interface {
+	Execute(ctx context.Context, userID gocql.UUID) (int, error)
+}
+
+type anonymizeUserReferencesUseCaseImpl struct {
+	logger *zap.Logger
+	repo   dom_file.FileMetadataRepository
+}
+
+// NewAnonymizeUserReferencesUseCase creates a new use case for anonymizing user references in files
+func NewAnonymizeUserReferencesUseCase(
+	logger *zap.Logger,
+	repo dom_file.FileMetadataRepository,
+) AnonymizeUserReferencesUseCase {
+	return &anonymizeUserReferencesUseCaseImpl{
+		logger: logger,
+		repo:   repo,
+	}
+}
+
+// DeletedUserUUID is a well-known UUID representing a deleted user
+// UUID: 00000000-0000-0000-0000-000000000001 (DELETED_USER)
+var DeletedUserUUID = gocql.UUID{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}
+
+func (uc *anonymizeUserReferencesUseCaseImpl) Execute(ctx context.Context, userID gocql.UUID) (int, error) {
+	uc.logger.Info("Anonymizing user references in file metadata",
+		zap.String("user_id", userID.String()))
+
+	// Get all files created or modified by this user
+	files, err := uc.repo.GetByCreatedByUserID(userID)
+	if err != nil {
+		uc.logger.Error("Failed to get files by created_by_user_id",
+			zap.String("user_id", userID.String()),
+			zap.Error(err))
+		return 0, fmt.Errorf("failed to get files by creator: %w", err)
+	}
+
+	updatedCount := 0
+
+	// Update each file to replace user references with deleted user UUID
+	for _, file := range files {
+		needsUpdate := false
+
+		// Check if this file has references to the deleted user
+		if file.CreatedByUserID == userID {
+			file.CreatedByUserID = DeletedUserUUID
+			needsUpdate = true
+		}
+
+		if file.ModifiedByUserID == userID {
+			file.ModifiedByUserID = DeletedUserUUID
+			needsUpdate = true
+		}
+
+		if needsUpdate {
+			// Update the file with anonymized references
+			if err := uc.repo.Update(file); err != nil {
+				uc.logger.Error("Failed to anonymize user references in file",
+					zap.String("file_id", file.ID.String()),
+					zap.String("user_id", userID.String()),
+					zap.Error(err))
+				// Continue with other files even if one fails
+				continue
+			}
+			updatedCount++
+		}
+	}
+
+	uc.logger.Info("✅ Anonymized user references in file metadata",
+		zap.String("user_id", userID.String()),
+		zap.Int("files_updated", updatedCount))
+
+	return updatedCount, nil
+}