code: def objects_copy(
      source_bucket,
      source_object,
      destination_bucket,
      destination_object,
  ):
      """Implement the 'Objects: copy' API, copy an object."""
      object_path, blob = testbench_utils.lookup_object(
          source_bucket, source_object
      )
      blob.check_preconditions(
          flask.request,
          if_generation_match="ifSourceGenerationMatch",
          if_generation_not_match="ifSourceGenerationNotMatch",
          if_metageneration_match="ifSourceMetagenerationMatch",
          if_metageneration_not_match="ifSourceMetagenerationNotMatch",
      )
      source_revision = blob.get_revision(
          flask.request, "sourceGeneration"
      )
      if source_revision is None:
          raise error_response.ErrorResponse(
              "Revision not found %s" % object_path, status_code=404
          )
  
      destination_path, destination = testbench_utils.get_object(
          destination_bucket,
          destination_object,
          gcs_object.GcsObject(destination_bucket, destination_object),
      )
      base_url = flask.url_for("gcs_index", _external=True)
      current_version = destination.copy_from(
          base_url, flask.request, source_revision
      )
      testbench_utils.insert_object(destination_path, destination)
      return testbench_utils.filtered_response(
          flask.request, current_version.metadata
      )
  
imports: import argparse
  import error_response
  import flask
  import gcs_bucket
  import gcs_object
  import json
  import os
  import re
  import testbench_utils
  import time
  import sys
  from werkzeug import serving
  from werkzeug.middleware.dispatcher import DispatcherMiddleware
label_desc: Use image node_id 15 for calling a global function with example usage: objects_copy(source_bucket, source_object, destination_bucket, destination_object) and returns: testbench_utils