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# Copyright 2015 Google Inc.
#
# 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.
"""Helpers for reading the Google Cloud SDK's configuration."""
import json
import os
import subprocess
import six
from google.auth import environment_vars
from google.auth import exceptions
# The ~/.config subdirectory containing gcloud credentials.
_CONFIG_DIRECTORY = "gcloud"
# Windows systems store config at %APPDATA%\gcloud
_WINDOWS_CONFIG_ROOT_ENV_VAR = "APPDATA"
# The name of the file in the Cloud SDK config that contains default
# credentials.
_CREDENTIALS_FILENAME = "application_default_credentials.json"
# The name of the Cloud SDK shell script
_CLOUD_SDK_POSIX_COMMAND = "gcloud"
_CLOUD_SDK_WINDOWS_COMMAND = "gcloud.cmd"
# The command to get the Cloud SDK configuration
_CLOUD_SDK_CONFIG_COMMAND = ("config", "config-helper", "--format", "json")
# The command to get google user access token
_CLOUD_SDK_USER_ACCESS_TOKEN_COMMAND = ("auth", "print-access-token")
# Cloud SDK's application-default client ID
CLOUD_SDK_CLIENT_ID = (
"764086051850-6qr4p6gpi6hn506pt8ejuq83di341hur.apps.googleusercontent.com"
)
def get_config_path():
"""Returns the absolute path the the Cloud SDK's configuration directory.
Returns:
str: The Cloud SDK config path.
"""
# If the path is explicitly set, return that.
try:
return os.environ[environment_vars.CLOUD_SDK_CONFIG_DIR]
except KeyError:
pass
# Non-windows systems store this at ~/.config/gcloud
if os.name != "nt":
return os.path.join(os.path.expanduser("~"), ".config", _CONFIG_DIRECTORY)
# Windows systems store config at %APPDATA%\gcloud
else:
try:
return os.path.join(
os.environ[_WINDOWS_CONFIG_ROOT_ENV_VAR], _CONFIG_DIRECTORY
)
except KeyError:
# This should never happen unless someone is really
# messing with things, but we'll cover the case anyway.
drive = os.environ.get("SystemDrive", "C:")
return os.path.join(drive, "\\", _CONFIG_DIRECTORY)
def get_application_default_credentials_path():
"""Gets the path to the application default credentials file.
The path may or may not exist.
Returns:
str: The full path to application default credentials.
"""
config_path = get_config_path()
return os.path.join(config_path, _CREDENTIALS_FILENAME)
def _run_subprocess_ignore_stderr(command):
""" Return subprocess.check_output with the given command and ignores stderr."""
with open(os.devnull, "w") as devnull:
output = subprocess.check_output(command, stderr=devnull)
return output
def get_project_id():
"""Gets the project ID from the Cloud SDK.
Returns:
Optional[str]: The project ID.
"""
if os.name == "nt":
command = _CLOUD_SDK_WINDOWS_COMMAND
else:
command = _CLOUD_SDK_POSIX_COMMAND
try:
# Ignore the stderr coming from gcloud, so it won't be mixed into the output.
# https://github.com/googleapis/google-auth-library-python/issues/673
output = _run_subprocess_ignore_stderr((command,) + _CLOUD_SDK_CONFIG_COMMAND)
except (subprocess.CalledProcessError, OSError, IOError):
return None
try:
configuration = json.loads(output.decode("utf-8"))
except ValueError:
return None
try:
return configuration["configuration"]["properties"]["core"]["project"]
except KeyError:
return None
def get_auth_access_token(account=None):
"""Load user access token with the ``gcloud auth print-access-token`` command.
Args:
account (Optional[str]): Account to get the access token for. If not
specified, the current active account will be used.
Returns:
str: The user access token.
Raises:
google.auth.exceptions.UserAccessTokenError: if failed to get access
token from gcloud.
"""
if os.name == "nt":
command = _CLOUD_SDK_WINDOWS_COMMAND
else:
command = _CLOUD_SDK_POSIX_COMMAND
try:
if account:
command = (
(command,)
+ _CLOUD_SDK_USER_ACCESS_TOKEN_COMMAND
+ ("--account=" + account,)
)
else:
command = (command,) + _CLOUD_SDK_USER_ACCESS_TOKEN_COMMAND
access_token = subprocess.check_output(command, stderr=subprocess.STDOUT)
# remove the trailing "\n"
return access_token.decode("utf-8").strip()
except (subprocess.CalledProcessError, OSError, IOError) as caught_exc:
new_exc = exceptions.UserAccessTokenError(
"Failed to obtain access token", caught_exc
)
six.raise_from(new_exc, caught_exc)
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