old_contents: # Copyright 2018 Google LLC
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     https://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  """Helper for finding credentials.
  
  When running this tool, there are two possible scenarios:
  
  1. The tool is running as part of CI to publish the docs. In that case,
     credentials should be at a well-known location or use ADC.
  2. The tool is running locally as part of development. In that case,
     the credentials should be passed into the command-line or via ADC.
  
  (2) takes precedence. Command-line params also override local files.
  """
  
  import os
  from typing import List, Optional
  
  from google.oauth2 import service_account
  import google.auth
  
  _WELL_KNOWN_LOCATIONS: List[str] = []
  
  if "KOKORO_KEYSTORE_DIR" in os.environ:
      _WELL_KNOWN_LOCATIONS.append(
          os.path.join(
              os.environ["KOKORO_KEYSTORE_DIR"], "73713_docuploader_service_account"
          )
      )
  
  
  def find_path():
      for location in _WELL_KNOWN_LOCATIONS:
          if os.path.exists(location):
              return location
      return ""
  
  
  def find(credentials_file: Optional[str]):
      if not credentials_file:
          credentials_file = find_path()
  
      if credentials_file != "":
          credentials = service_account.Credentials.from_service_account_file(
              credentials_file
          )
          return credentials, credentials.project_id
      else:
          return google.auth.default()
  
new_contents: # Copyright 2018 Google LLC
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     https://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  """Helper for finding credentials.
  
  When running this tool, there are two possible scenarios:
  
  1. The tool is running as part of CI to publish the docs. In that case,
     credentials should be at a well-known location or use ADC.
  2. The tool is running locally as part of development. In that case,
     the credentials should be passed into the command-line or via ADC.
  
  (2) takes precedence. Command-line params also override local files.
  """
  
  import os
  from typing import List, Optional
  
  from google.oauth2 import service_account
  import google.auth
  
  _WELL_KNOWN_LOCATIONS: List[str] = []
  
  if "KOKORO_KEYSTORE_DIR" in os.environ:
      _WELL_KNOWN_LOCATIONS.append(
          os.path.join(
              os.environ["KOKORO_KEYSTORE_DIR"], "73713_docuploader_service_account"
          )
      )
  
  
  def find_path():
      for location in _WELL_KNOWN_LOCATIONS:
          if os.path.exists(location):
              return location
      return ""
  
  
  def find(credentials_file: Optional[str] = ""):
      if not credentials_file:
          credentials_file = find_path()
  
      if credentials_file != "":
          credentials = service_account.Credentials.from_service_account_file(
              credentials_file
          )
          return credentials, credentials.project_id
      else:
          return google.auth.default()
  
subject: make credentials_file optional (#64)