Add session utils for authentication and authorization using OpenID Connect (OIDC)

requirements_test.txt

@@ -3,5 +3,6 @@ pytest==6.2.4
 pytest-cov==2.12.1
 pytest-flake8==1.0.7
 pytest-localserver==0.5.0
+responses==0.10.16
 types-requests==2.27.14
 types-Pillow==9.0.8

setup.py

@@ -52,7 +52,7 @@
     package_dir={'': 'src'},
     extras_require={
         'gcp': [
-            'dataclasses>=0.8; python_version=="3.6"',
+            'dataclasses>=0.8; python_version < "3.7.0"',
             'google-auth>=1.6',
             'google-oauth>=1.0',
         ],
@@ -61,6 +61,7 @@
     install_requires=[
         'numpy>=1.19',
         'requests>=2.18',
+        'requests-oauthlib>=1.2',
         'retrying>=1.3.3',
         'Pillow>=8.3',
         'pydicom>=2.2',

src/dicomweb_client/ext/gcp/session_utils.py

@@ -13,8 +13,8 @@
 
 
 def create_session_from_gcp_credentials(
-        google_credentials: Optional[Any] = None
-    ) -> requests.Session:
+    google_credentials: Optional[Any] = None
+) -> requests.Session:
     """Creates an authorized session for Google Cloud Platform.
 
     Parameters

src/dicomweb_client/file.py

@@ -612,7 +612,7 @@ def decode_frame(self, index: int, value: bytes):
             n_pixels = self._pixels_per_frame
             pixel_offset = int(((index * n_pixels / 8) % 1) * 8)
             pixel_array = unpacked_frame[pixel_offset:pixel_offset + n_pixels]
-            return pixel_array.reshape(rows, columns)
+            return pixel_array.reshape(rows, columns)  # type: ignore
         else:
             # This hack creates a small dataset containing a Pixel Data element
             # with only a single frame item, which can then be decoded using the