Add AzureNamedKeyCredential (Azure#17548)

* Add AzureNamedKeyCredential

* lint

* Update sdk/core/azure-core/CHANGELOG.md

Co-authored-by: swathipil <76007337+swathipil@users.noreply.github.com>

* some changes

* oops

* version

* mypy fix

* lint

* remove policy

* doc

* Update sdk/core/azure-core/azure/core/pipeline/policies/_authentication.py

* Update sdk/core/azure-core/azure/core/pipeline/policies/__init__.py

* Update sdk/core/azure-core/azure/core/pipeline/policies/__init__.py

* changelog

* update tests

* fix

* update test

Co-authored-by: swathipil <76007337+swathipil@users.noreply.github.com>

Author: Rakshith Bhyravabhotla

sdk/core/azure-core/CHANGELOG.md

@@ -1,7 +1,10 @@
 # Release History
 
-## 1.13.1 (Unreleased)
+## 1.14.0 (Unreleased)
 
+### New Features
+
+- Added `azure.core.credentials.AzureNamedKeyCredential` credential #17548.
 
 ## 1.13.0 (2021-04-02)
 

sdk/core/azure-core/azure/core/_version.py

@@ -9,4 +9,4 @@
 # regenerated.
 # --------------------------------------------------------------------------
 
-VERSION = "1.13.1"
+VERSION = "1.14.0"

sdk/core/azure-core/azure/core/credentials.py

@@ -3,10 +3,10 @@
 # Licensed under the MIT License. See LICENSE.txt in the project root for
 # license information.
 # -------------------------------------------------------------------------
+from collections import namedtuple
 from typing import TYPE_CHECKING
 import six
 
-
 if TYPE_CHECKING:
     from typing import Any, NamedTuple
     from typing_extensions import Protocol
@@ -26,11 +26,12 @@ def get_token(self, *scopes, **kwargs):
 
 
 else:
-    from collections import namedtuple
-
     AccessToken = namedtuple("AccessToken", ["token", "expires_on"])
 
-__all__ = ["AzureKeyCredential", "AzureSasCredential", "AccessToken"]
+AzureNamedKey = namedtuple("AzureNamedKey", ["name", "key"])
+
+
+__all__ = ["AzureKeyCredential", "AzureSasCredential", "AccessToken", "AzureNamedKeyCredential"]
 
 
 class AzureKeyCredential(object):
@@ -111,3 +112,41 @@ def update(self, signature):
         if not isinstance(signature, six.string_types):
             raise TypeError("The signature used for updating must be a string.")
         self._signature = signature
+
+
+class AzureNamedKeyCredential(object):
+    """Credential type used for working with any service needing a named key that follows patterns
+    established by the other credential types.
+
+    :param str name: The name of the credential used to authenticate to an Azure service.
+    :param str key: The key used to authenticate to an Azure service.
+    :raises: TypeError
+    """
+    def __init__(self, name, key):
+        # type: (str, str) -> None
+        if not isinstance(name, six.string_types) or not isinstance(key, six.string_types):
+            raise TypeError("Both name and key must be strings.")
+        self._credential = AzureNamedKey(name, key)
+
+    @property
+    def named_key(self):
+        # type () -> AzureNamedKey
+        """The value of the configured name.
+
+        :rtype: AzureNamedKey
+        """
+        return self._credential
+
+    def update(self, name, key):
+        # type: (str, str) -> None
+        """Update the named key credential.
+
+        Both name and key must be provided in order to update the named key credential.
+        Individual attributes cannot be updated.
+
+        :param str name: The name of the credential used to authenticate to an Azure service.
+        :param str key: The key used to authenticate to an Azure service.
+        """
+        if not isinstance(name, six.string_types) or not isinstance(key, six.string_types):
+            raise TypeError("Both name and key must be strings.")
+        self._credential = AzureNamedKey(name, key)

sdk/core/azure-core/tests/test_authentication.py

@@ -6,10 +6,13 @@
 import time
 
 import azure.core
-from azure.core.credentials import AccessToken, AzureKeyCredential, AzureSasCredential
+from azure.core.credentials import AccessToken, AzureKeyCredential, AzureSasCredential, AzureNamedKeyCredential
 from azure.core.exceptions import ServiceRequestError
 from azure.core.pipeline import Pipeline
-from azure.core.pipeline.policies import BearerTokenCredentialPolicy, SansIOHTTPPolicy, AzureKeyCredentialPolicy, AzureSasCredentialPolicy
+from azure.core.pipeline.policies import (
+    BearerTokenCredentialPolicy, SansIOHTTPPolicy, AzureKeyCredentialPolicy,
+    AzureSasCredentialPolicy
+)
 from azure.core.pipeline.transport import HttpRequest
 
 import pytest
@@ -230,3 +233,26 @@ def test_azure_sas_credential_policy_raises():
     sas = 1234
     with pytest.raises(TypeError):
         credential = AzureSasCredential(sas)
+
+def test_azure_named_key_credential():
+    cred = AzureNamedKeyCredential("sample_name", "samplekey")
+
+    assert cred.named_key.name == "sample_name"
+    assert cred.named_key.key == "samplekey"
+    assert isinstance(cred.named_key, tuple)
+
+    cred.update("newname", "newkey")
+    assert cred.named_key.name == "newname"
+    assert cred.named_key.key == "newkey"
+    assert isinstance(cred.named_key, tuple)
+
+def test_azure_named_key_credential_raises():
+    with pytest.raises(TypeError, match="Both name and key must be strings."):
+        cred = AzureNamedKeyCredential("sample_name", 123345)
+
+    cred = AzureNamedKeyCredential("sample_name", "samplekey")
+    assert cred.named_key.name == "sample_name"
+    assert cred.named_key.key == "samplekey"
+
+    with pytest.raises(TypeError, match="Both name and key must be strings."):
+        cred.update(1234, "newkey")