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# ------------------------------------
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
# ------------------------------------
from typing import Callable, Coroutine, Any
from azure.core.credentials_async import AsyncTokenCredential
from azure.core.pipeline.policies import AsyncBearerTokenCredentialPolicy
from azure.core.pipeline import PipelineRequest, PipelineContext
from azure.core.rest import HttpRequest
def _make_request() -> PipelineRequest[HttpRequest]:
return PipelineRequest(HttpRequest("CredentialWrapper", "https://fakeurl"), PipelineContext(None))
def get_bearer_token_provider(credential: AsyncTokenCredential, *scopes: str) -> Callable[[], Coroutine[Any, Any, str]]:
"""Returns a callable that provides a bearer token.
It can be used for instance to write code like:
.. code-block:: python
from azure.identity.aio import DefaultAzureCredential, get_bearer_token_provider
credential = DefaultAzureCredential()
bearer_token_provider = get_bearer_token_provider(credential, "https://cognitiveservices.azure.com/.default")
# Usage
request.headers["Authorization"] = "Bearer " + await bearer_token_provider()
:param credential: The credential used to authenticate the request.
:type credential: ~azure.core.credentials_async.AsyncTokenCredential
:param str scopes: The scopes required for the bearer token.
:rtype: coroutine
:return: A coroutine that returns a bearer token.
"""
policy = AsyncBearerTokenCredentialPolicy(credential, *scopes)
async def wrapper() -> str:
request = _make_request()
await policy.on_request(request)
return request.http_request.headers["Authorization"][len("Bearer ") :]
return wrapper