old_contents: #!/usr/bin/python3
  # Copyright 2022 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
  #
  #      http://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.
  
  import os
  import sys
  import mock
  import atheris
  
  import json
  import mock
  from google_auth_oauthlib import helpers
  
  
  def TestOneInput(data):
      fdp = atheris.FuzzedDataProvider(data)
      config_file = "conf.txt"
      try:
          payload = json.loads(fdp.ConsumeUnicodeNoSurrogates(1024))
      except:
          return
  
      if type(payload) is not dict:
          return
  
      with open(config_file, "w") as f:
          f.write(json.dumps(payload))
  
      if not os.path.isfile(config_file):
          return
  
      try:
          helpers.session_from_client_secrets_file(
              config_file, scopes=mock.sentinel.scopes
          )
      except ValueError as ve:
          legit_exceptions = [
              "Client secrets must be for a web or installed app.",
              "Client secrets is not in the correct format."
          ]
          legit = False
          for msg in legit_exceptions:
              if msg in str(ve):
                  legit = True
          if not legit:
              raise ve
      os.remove(config_file)
  
  
  def main():
      atheris.instrument_all()
      atheris.Setup(sys.argv, TestOneInput, enable_python_coverage=True)
      atheris.Fuzz()
  
  
  if __name__ == "__main__":
      main()
  
new_contents: #!/usr/bin/python3
  # Copyright 2022 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
  #
  #      http://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.
  
  import os
  import sys
  import mock
  import atheris
  import tempfile
  
  import json
  import mock
  from google_auth_oauthlib import helpers
  
  
  def TestOneInput(data):
      fdp = atheris.FuzzedDataProvider(data)
      config_file = tempfile.NamedTemporaryFile(mode="wt")
      try:
          payload = json.loads(fdp.ConsumeUnicodeNoSurrogates(1024))
      except:
          return
      if type(payload) is not dict:
          return
      config_file.write(json.dumps(payload))
  
      try:
          helpers.session_from_client_secrets_file(
              config_file.name, scopes=mock.sentinel.scopes
          )
      except ValueError as ve:
          legit_exceptions = [
              "Client secrets must be for a web or installed app.",
              "Client secrets is not in the correct format."
          ]
          legit = False
          for msg in legit_exceptions:
              if msg in str(ve):
                  legit = True
          if not legit:
              raise ve
  
  
  def main():
      atheris.instrument_all()
      atheris.Setup(sys.argv, TestOneInput, enable_python_coverage=True)
      atheris.Fuzz()
  
  
  if __name__ == "__main__":
      main()
  
subject: refactor fuzzer (#8520)