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[Cosmos] AAD authentication async client (Azure#23717)
* working authentication to get database account * working aad authentication for sync client with sample * readme and changelog * pylint and better comments on sample * working async aad * Delete access_cosmos_with_aad.py snuck its way into the async PR * Update _auth_policies.py * small changes * Update _cosmos_client_connection.py * removing changes made in sync * Update _auth_policy_async.py * Update _auth_policy_async.py * Update _auth_policy_async.py * added licenses to samples
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175 changes: 175 additions & 0 deletions
175
sdk/cosmos/azure-cosmos/azure/cosmos/aio/_auth_policy_async.py
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| # ------------------------------------------------------------------------- | ||
| # Copyright (c) Microsoft Corporation. All rights reserved. | ||
| # Licensed under the MIT License. See LICENSE.txt in the project root for | ||
| # license information. | ||
| # ------------------------------------------------------------------------- | ||
| import asyncio | ||
| import time | ||
|
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| from typing import Any, Awaitable, Optional, Dict, Union | ||
| from azure.core.pipeline.policies import AsyncHTTPPolicy | ||
| from azure.core.credentials import AccessToken | ||
| from azure.core.pipeline import PipelineRequest, PipelineResponse | ||
| from azure.cosmos import http_constants | ||
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| async def await_result(func, *args, **kwargs): | ||
| """If func returns an awaitable, await it.""" | ||
| result = func(*args, **kwargs) | ||
| if hasattr(result, "__await__"): | ||
| # type ignore on await: https://github.com/python/mypy/issues/7587 | ||
| return await result # type: ignore | ||
| return result | ||
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| class _AsyncCosmosBearerTokenCredentialPolicyBase(object): | ||
| """Base class for a Bearer Token Credential Policy. | ||
| :param credential: The credential. | ||
| :type credential: ~azure.core.credentials.TokenCredential | ||
| :param str scopes: Lets you specify the type of access needed. | ||
| """ | ||
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| def __init__(self, credential, *scopes, **kwargs): # pylint:disable=unused-argument | ||
| # type: (TokenCredential, *str, **Any) -> None | ||
| super(_AsyncCosmosBearerTokenCredentialPolicyBase, self).__init__() | ||
| self._scopes = scopes | ||
| self._credential = credential | ||
| self._token = None # type: Optional[AccessToken] | ||
| self._lock = asyncio.Lock() | ||
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| @staticmethod | ||
| def _enforce_https(request): | ||
| # type: (PipelineRequest) -> None | ||
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| # move 'enforce_https' from options to context so it persists | ||
| # across retries but isn't passed to a transport implementation | ||
| option = request.context.options.pop("enforce_https", None) | ||
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| # True is the default setting; we needn't preserve an explicit opt in to the default behavior | ||
| if option is False: | ||
| request.context["enforce_https"] = option | ||
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| enforce_https = request.context.get("enforce_https", True) | ||
| if enforce_https and not request.http_request.url.lower().startswith("https"): | ||
| raise ValueError( | ||
| "Bearer token authentication is not permitted for non-TLS protected (non-https) URLs." | ||
| ) | ||
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| @staticmethod | ||
| def _update_headers(headers, token): | ||
| # type: (Dict[str, str], str) -> None | ||
| """Updates the Authorization header with the cosmos signature and bearer token. | ||
| This is the main method that differentiates this policy from core's BearerTokenCredentialPolicy and works | ||
| to properly sign the authorization header for Cosmos' REST API. For more information: | ||
| https://docs.microsoft.com/rest/api/cosmos-db/access-control-on-cosmosdb-resources#authorization-header | ||
| :param dict headers: The HTTP Request headers | ||
| :param str token: The OAuth token. | ||
| """ | ||
| headers[http_constants.HttpHeaders.Authorization] = "type=aad&ver=1.0&sig={}".format(token) | ||
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| @property | ||
| def _need_new_token(self) -> bool: | ||
| return not self._token or self._token.expires_on - time.time() < 300 | ||
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| class AsyncCosmosBearerTokenCredentialPolicy(_AsyncCosmosBearerTokenCredentialPolicyBase, AsyncHTTPPolicy): | ||
| """Adds a bearer token Authorization header to requests. | ||
| :param credential: The credential. | ||
| :type credential: ~azure.core.TokenCredential | ||
| :param str scopes: Lets you specify the type of access needed. | ||
| :raises ValueError: If https_enforce does not match with endpoint being used. | ||
| """ | ||
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| async def on_request(self, request: "PipelineRequest") -> None: # pylint:disable=invalid-overridden-method | ||
| """Adds a bearer token Authorization header to request and sends request to next policy. | ||
| :param request: The pipeline request object to be modified. | ||
| :type request: ~azure.core.pipeline.PipelineRequest | ||
| :raises: :class:`~azure.core.exceptions.ServiceRequestError` | ||
| """ | ||
| self._enforce_https(request) # pylint:disable=protected-access | ||
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| if self._token is None or self._need_new_token: | ||
| async with self._lock: | ||
| # double check because another coroutine may have acquired a token while we waited to acquire the lock | ||
| if self._token is None or self._need_new_token: | ||
| self._token = await self._credential.get_token(*self._scopes) | ||
| self._update_headers(request.http_request.headers, self._token.token) | ||
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| async def authorize_request(self, request: "PipelineRequest", *scopes: str, **kwargs: "Any") -> None: | ||
| """Acquire a token from the credential and authorize the request with it. | ||
| Keyword arguments are passed to the credential's get_token method. The token will be cached and used to | ||
| authorize future requests. | ||
| :param ~azure.core.pipeline.PipelineRequest request: the request | ||
| :param str scopes: required scopes of authentication | ||
| """ | ||
| async with self._lock: | ||
| self._token = await self._credential.get_token(*scopes, **kwargs) | ||
| self._update_headers(request.http_request.headers, self._token.token) | ||
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| async def send(self, request: "PipelineRequest") -> "PipelineResponse": | ||
| """Authorize request with a bearer token and send it to the next policy | ||
| :param request: The pipeline request object | ||
| :type request: ~azure.core.pipeline.PipelineRequest | ||
| """ | ||
| await await_result(self.on_request, request) | ||
| try: | ||
| response = await self.next.send(request) | ||
| await await_result(self.on_response, request, response) | ||
| except Exception: # pylint:disable=broad-except | ||
| handled = await await_result(self.on_exception, request) | ||
| if not handled: | ||
| raise | ||
| else: | ||
| if response.http_response.status_code == 401: | ||
| self._token = None # any cached token is invalid | ||
| if "WWW-Authenticate" in response.http_response.headers: | ||
| request_authorized = await self.on_challenge(request, response) | ||
| if request_authorized: | ||
| try: | ||
| response = await self.next.send(request) | ||
| await await_result(self.on_response, request, response) | ||
| except Exception: # pylint:disable=broad-except | ||
| handled = await await_result(self.on_exception, request) | ||
| if not handled: | ||
| raise | ||
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| return response | ||
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| async def on_challenge(self, request: "PipelineRequest", response: "PipelineResponse") -> bool: | ||
| """Authorize request according to an authentication challenge | ||
| This method is called when the resource provider responds 401 with a WWW-Authenticate header. | ||
| :param ~azure.core.pipeline.PipelineRequest request: the request which elicited an authentication challenge | ||
| :param ~azure.core.pipeline.PipelineResponse response: the resource provider's response | ||
| :returns: a bool indicating whether the policy should send the request | ||
| """ | ||
| # pylint:disable=unused-argument,no-self-use | ||
| return False | ||
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| def on_response(self, request: PipelineRequest, response: PipelineResponse) -> Union[None, Awaitable[None]]: | ||
| """Executed after the request comes back from the next policy. | ||
| :param request: Request to be modified after returning from the policy. | ||
| :type request: ~azure.core.pipeline.PipelineRequest | ||
| :param response: Pipeline response object | ||
| :type response: ~azure.core.pipeline.PipelineResponse | ||
| """ | ||
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| def on_exception(self, request: PipelineRequest) -> None: | ||
| """Executed when an exception is raised while executing the next policy. | ||
| This method is executed inside the exception handler. | ||
| :param request: The Pipeline request object | ||
| :type request: ~azure.core.pipeline.PipelineRequest | ||
| """ | ||
| # pylint: disable=no-self-use,unused-argument | ||
| return |
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116 changes: 116 additions & 0 deletions
116
sdk/cosmos/azure-cosmos/samples/access_cosmos_with_aad_async.py
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| # ------------------------------------------------------------------------- | ||
| # Copyright (c) Microsoft Corporation. All rights reserved. | ||
| # Licensed under the MIT License. See LICENSE.txt in the project root for | ||
| # license information. | ||
| # ------------------------------------------------------------------------- | ||
| from azure.cosmos.aio import CosmosClient | ||
| import azure.cosmos.exceptions as exceptions | ||
| from azure.cosmos.partition_key import PartitionKey | ||
| from azure.identity.aio import ClientSecretCredential, DefaultAzureCredential | ||
| import config | ||
| import asyncio | ||
|
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| # ---------------------------------------------------------------------------------------------------------- | ||
| # Prerequistes - | ||
| # | ||
| # 1. An Azure Cosmos account - | ||
| # https://docs.microsoft.com/azure/cosmos-db/create-sql-api-python#create-a-database-account | ||
| # | ||
| # 2. Microsoft Azure Cosmos | ||
| # pip install azure-cosmos>=4.3.0b4 | ||
| # ---------------------------------------------------------------------------------------------------------- | ||
| # Sample - demonstrates how to authenticate and use your database account using AAD credentials | ||
| # Read more about operations allowed for this authorization method: https://aka.ms/cosmos-native-rbac | ||
| # ---------------------------------------------------------------------------------------------------------- | ||
| # Note: | ||
| # This sample creates a Container to your database account. | ||
| # Each time a Container is created the account will be billed for 1 hour of usage based on | ||
| # the provisioned throughput (RU/s) of that account. | ||
| # ---------------------------------------------------------------------------------------------------------- | ||
| # <configureConnectivity> | ||
| HOST = config.settings["host"] | ||
| MASTER_KEY = config.settings["master_key"] | ||
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| TENANT_ID = config.settings["tenant_id"] | ||
| CLIENT_ID = config.settings["client_id"] | ||
| CLIENT_SECRET = config.settings["client_secret"] | ||
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| DATABASE_ID = config.settings["database_id"] | ||
| CONTAINER_ID = config.settings["container_id"] | ||
| PARTITION_KEY = PartitionKey(path="/id") | ||
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| def get_test_item(num): | ||
| test_item = { | ||
| 'id': 'Item_' + str(num), | ||
| 'test_object': True, | ||
| 'lastName': 'Smith' | ||
| } | ||
| return test_item | ||
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| async def create_sample_resources(): | ||
| print("creating sample resources") | ||
| async with CosmosClient(HOST, MASTER_KEY) as client: | ||
| db = await client.create_database(DATABASE_ID) | ||
| await db.create_container(id=CONTAINER_ID, partition_key=PARTITION_KEY) | ||
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| async def delete_sample_resources(): | ||
| print("deleting sample resources") | ||
| async with CosmosClient(HOST, MASTER_KEY) as client: | ||
| await client.delete_database(DATABASE_ID) | ||
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| async def run_sample(): | ||
| # Since Azure Cosmos DB data plane SDK does not cover management operations, we have to create our resources | ||
| # with a master key authenticated client for this sample. | ||
| await create_sample_resources() | ||
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| # With this done, you can use your AAD service principal id and secret to create your ClientSecretCredential. | ||
| # The async ClientSecretCredentials, like the async client, also have a context manager, | ||
| # and as such should be used with the `async with` keywords. | ||
| async with ClientSecretCredential( | ||
| tenant_id=TENANT_ID, | ||
| client_id=CLIENT_ID, | ||
| client_secret=CLIENT_SECRET) as aad_credentials: | ||
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| # Use your credentials to authenticate your client. | ||
| async with CosmosClient(HOST, aad_credentials) as aad_client: | ||
| print("Showed ClientSecretCredential, now showing DefaultAzureCredential") | ||
|
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| # You can also utilize DefaultAzureCredential rather than directly passing in the id's and secrets. | ||
| # This is the recommended method of authentication, and uses environment variables rather than in-code strings. | ||
| async with DefaultAzureCredential() as aad_credentials: | ||
|
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| # Use your credentials to authenticate your client. | ||
| async with CosmosClient(HOST, aad_credentials) as aad_client: | ||
|
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| # Do any R/W data operations with your authorized AAD client. | ||
| db = aad_client.get_database_client(DATABASE_ID) | ||
| container = db.get_container_client(CONTAINER_ID) | ||
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| print("Container info: " + str(container.read())) | ||
| await container.create_item(get_test_item(879)) | ||
| print("Point read result: " + str(container.read_item(item='Item_0', partition_key='Item_0'))) | ||
| query_results = [item async for item in | ||
| container.query_items(query='select * from c', partition_key='Item_0')] | ||
| assert len(query_results) == 1 | ||
| print("Query result: " + str(query_results[0])) | ||
| await container.delete_item(item='Item_0', partition_key='Item_0') | ||
|
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| # Attempting to do management operations will return a 403 Forbidden exception. | ||
| try: | ||
| await aad_client.delete_database(DATABASE_ID) | ||
| except exceptions.CosmosHttpResponseError as e: | ||
| assert e.status_code == 403 | ||
| print("403 error assertion success") | ||
|
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| # To clean up the sample, we use a master key client again to get access to deleting containers/ databases. | ||
| await delete_sample_resources() | ||
| print("end of sample") | ||
|
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| if __name__ == "__main__": | ||
| loop = asyncio.get_event_loop() | ||
| loop.run_until_complete(run_sample()) |
5 changes: 5 additions & 0 deletions
5
sdk/cosmos/azure-cosmos/samples/access_cosmos_with_resource_token.py
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sdk/cosmos/azure-cosmos/samples/access_cosmos_with_resource_token_async.py
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sdk/cosmos/azure-cosmos/samples/change_feed_management_async.py
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