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# ------------------------------------
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
# ------------------------------------
import json
import time
from unittest import mock
from azure.core.credentials import AccessToken
from azure.core.exceptions import ClientAuthenticationError
from azure.identity import CredentialUnavailableError
from azure.identity._constants import Endpoints
from azure.identity._internal.user_agent import USER_AGENT
from azure.identity.aio._credentials.managed_identity import ImdsCredential
import pytest
from helpers import mock_response, Request
from helpers_async import async_validating_transport, AsyncMockTransport, get_completed_future, wrap_in_future
pytestmark = pytest.mark.asyncio
async def test_no_scopes():
"""The credential should raise ValueError when get_token is called with no scopes"""
successful_probe = mock_response(status_code=400, json_payload={})
transport = mock.Mock(send=mock.Mock(return_value=get_completed_future(successful_probe)))
credential = ImdsCredential(transport=transport)
with pytest.raises(ValueError):
await credential.get_token()
async def test_multiple_scopes():
"""The credential should raise ValueError when get_token is called with more than one scope"""
successful_probe = mock_response(status_code=400, json_payload={})
transport = mock.Mock(send=mock.Mock(return_value=get_completed_future(successful_probe)))
credential = ImdsCredential(transport=transport)
with pytest.raises(ValueError):
await credential.get_token("one scope", "and another")
async def test_imds_close():
transport = AsyncMockTransport()
credential = ImdsCredential(transport=transport)
await credential.close()
assert transport.__aexit__.call_count == 1
async def test_imds_context_manager():
transport = AsyncMockTransport()
credential = ImdsCredential(transport=transport)
async with credential:
pass
assert transport.__aexit__.call_count == 1
async def test_identity_not_available():
"""The credential should raise CredentialUnavailableError when the endpoint responds 400 to a token request"""
# first request is a probe, second a token request
transport = async_validating_transport(
requests=[Request()] * 2, responses=[mock_response(status_code=400, json_payload={})] * 2
)
credential = ImdsCredential(transport=transport)
with pytest.raises(CredentialUnavailableError):
await credential.get_token("scope")
async def test_unexpected_error():
"""The credential should raise ClientAuthenticationError when the endpoint returns an unexpected error"""
error_message = "something went wrong"
for code in range(401, 600):
async def send(request, **_):
if "resource" not in request.query:
# availability probe
return mock_response(status_code=400, json_payload={})
return mock_response(status_code=code, json_payload={"error": error_message})
transport = mock.Mock(send=send, sleep=lambda _: get_completed_future())
credential = ImdsCredential(transport=transport)
with pytest.raises(ClientAuthenticationError) as ex:
await credential.get_token("scope")
assert error_message in ex.value.message
async def test_cache():
scope = "https://foo.bar"
expired = "this token's expired"
now = int(time.time())
token_payload = {
"access_token": expired,
"refresh_token": "",
"expires_in": 0,
"expires_on": now - 300, # expired 5 minutes ago
"not_before": now,
"resource": scope,
"token_type": "Bearer",
}
mock_response = mock.Mock(
text=lambda encoding=None: json.dumps(token_payload),
headers={"content-type": "application/json"},
status_code=200,
content_type="application/json",
)
mock_send = mock.Mock(return_value=mock_response)
credential = ImdsCredential(transport=mock.Mock(send=wrap_in_future(mock_send)))
token = await credential.get_token(scope)
assert token.token == expired
assert mock_send.call_count == 2 # first request was probing for endpoint availability
# calling get_token again should provoke another HTTP request
good_for_an_hour = "this token's good for an hour"
token_payload["expires_on"] = int(time.time()) + 3600
token_payload["expires_in"] = 3600
token_payload["access_token"] = good_for_an_hour
token = await credential.get_token(scope)
assert token.token == good_for_an_hour
assert mock_send.call_count == 3
# get_token should return the cached token now
token = await credential.get_token(scope)
assert token.token == good_for_an_hour
assert mock_send.call_count == 3
async def test_retries():
mock_response = mock.Mock(
text=lambda encoding=None: b"{}",
headers={"content-type": "application/json", "Retry-After": "0"},
content_type="application/json",
)
mock_send = mock.Mock(return_value=mock_response)
total_retries = ImdsCredential._create_config().retry_policy.total_retries
for status_code in (404, 429, 500):
mock_send.reset_mock()
mock_response.status_code = status_code
try:
await ImdsCredential(
transport=mock.Mock(send=wrap_in_future(mock_send), sleep=wrap_in_future(lambda _: None))
).get_token("scope")
except ClientAuthenticationError:
pass
# first call was availability probe, second the original request;
# credential should have then exhausted retries for each of these status codes
assert mock_send.call_count == 2 + total_retries
async def test_identity_config():
param_name, param_value = "foo", "bar"
access_token = "****"
expires_on = 42
expected_token = AccessToken(access_token, expires_on)
scope = "scope"
client_id = "some-guid"
transport = async_validating_transport(
requests=[
Request(base_url=Endpoints.IMDS),
Request(
base_url=Endpoints.IMDS,
method="GET",
required_headers={"Metadata": "true", "User-Agent": USER_AGENT},
required_params={"api-version": "2018-02-01", "resource": scope, param_name: param_value},
),
],
responses=[
mock_response(status_code=400, json_payload={"error": "this is an error message"}),
mock_response(
json_payload={
"access_token": access_token,
"expires_in": 42,
"expires_on": expires_on,
"ext_expires_in": 42,
"not_before": int(time.time()),
"resource": scope,
"token_type": "Bearer",
}
),
],
)
credential = ImdsCredential(client_id=client_id, identity_config={param_name: param_value}, transport=transport)
token = await credential.get_token(scope)
assert token == expected_token
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