s3tables: extract utility and filer operations to separate modules

- Move ARN parsing, path helpers, and metadata structures to utils.go
- Extract all extended attribute and filer operations to filer_ops.go
- Reduces code duplication and improves modularity
- Improves code organization and maintainability

weed/s3api/s3tables/utils.go

@@ -0,0 +1,109 @@
+package s3tables
+
+import (
+	"fmt"
+	"regexp"
+	"time"
+)
+
+// ARN parsing functions
+
+// parseBucketNameFromARN extracts bucket name from table bucket ARN
+// ARN format: arn:aws:s3tables:{region}:{account}:bucket/{bucket-name}
+func parseBucketNameFromARN(arn string) (string, error) {
+	pattern := regexp.MustCompile(`^arn:aws:s3tables:[^:]*:[^:]*:bucket/([a-z0-9_-]+)$`)
+	matches := pattern.FindStringSubmatch(arn)
+	if len(matches) != 2 {
+		return "", fmt.Errorf("invalid bucket ARN: %s", arn)
+	}
+	return matches[1], nil
+}
+
+// parseTableFromARN extracts bucket name, namespace, and table name from ARN
+// ARN format: arn:aws:s3tables:{region}:{account}:bucket/{bucket-name}/table/{namespace}/{table-name}
+func parseTableFromARN(arn string) (bucketName, namespace, tableName string, err error) {
+	pattern := regexp.MustCompile(`^arn:aws:s3tables:[^:]*:[^:]*:bucket/([a-z0-9_-]+)/table/([a-z0-9_]+)/([a-z0-9_]+)$`)
+	matches := pattern.FindStringSubmatch(arn)
+	if len(matches) != 4 {
+		return "", "", "", fmt.Errorf("invalid table ARN: %s", arn)
+	}
+	return matches[1], matches[2], matches[3], nil
+}
+
+// Path helpers
+
+// getTableBucketPath returns the filer path for a table bucket
+func getTableBucketPath(bucketName string) string {
+	return fmt.Sprintf("%s/%s", TablesPath, bucketName)
+}
+
+// getNamespacePath returns the filer path for a namespace
+func getNamespacePath(bucketName, namespace string) string {
+	return fmt.Sprintf("%s/%s/namespaces/%s", TablesPath, bucketName, namespace)
+}
+
+// getTablePath returns the filer path for a table
+func getTablePath(bucketName, namespace, tableName string) string {
+	return fmt.Sprintf("%s/%s/namespaces/%s/%s", TablesPath, bucketName, namespace, tableName)
+}
+
+// Metadata structures
+
+// tableBucketMetadata stores metadata for a table bucket
+type tableBucketMetadata struct {
+	Name      string    `json:"name"`
+	CreatedAt time.Time `json:"createdAt"`
+	OwnerID   string    `json:"ownerAccountId"`
+}
+
+// namespaceMetadata stores metadata for a namespace
+type namespaceMetadata struct {
+	Namespace []string  `json:"namespace"`
+	CreatedAt time.Time `json:"createdAt"`
+	OwnerID   string    `json:"ownerAccountId"`
+}
+
+// tableMetadataInternal stores metadata for a table
+type tableMetadataInternal struct {
+	Name             string         `json:"name"`
+	Namespace        string         `json:"namespace"`
+	Format           string         `json:"format"`
+	CreatedAt        time.Time      `json:"createdAt"`
+	ModifiedAt       time.Time      `json:"modifiedAt"`
+	OwnerID          string         `json:"ownerAccountId"`
+	VersionToken     string         `json:"versionToken"`
+	MetadataLocation string         `json:"metadataLocation,omitempty"`
+	Schema           *TableMetadata `json:"metadata,omitempty"`
+}
+
+// Utility functions
+
+// generateVersionToken generates a unique version token
+func generateVersionToken() string {
+	return fmt.Sprintf("%d", time.Now().UnixNano())
+}
+
+// splitPath splits a path into directory and name components
+func splitPath(path string) (dir, name string) {
+	var idx int
+	var i int
+
+	// Remove trailing slash
+	for i = len(path) - 1; i >= 0 && path[i] == '/'; i-- {
+	}
+	path = path[:i+1]
+
+	// Find last separator
+	idx = len(path) - 1
+	for idx >= 0 && path[idx] != '/' {
+		idx--
+	}
+
+	if idx == -1 {
+		return "/", path
+	}
+	if idx == 0 {
+		return "/", path[1:]
+	}
+	return path[:idx], path[idx+1:]
+}