API-2197 check for client credentials, use corresponding client in oauth library

Author: ahongbynder

bynder_sdk/client/bynder_client.py

@@ -4,6 +4,7 @@
 from bynder_sdk.client.workflow_client import WorkflowClient
 from bynder_sdk.oauth2 import BynderOAuth2Session
 from bynder_sdk.permanent_token import PermanentTokenSession
+from oauthlib.oauth2 import BackendApplicationClient
 
 REQUIRED_OAUTH_KWARGS = (
     'client_id', 'client_secret', 'redirect_uri', 'scopes')
@@ -29,6 +30,8 @@ def __init__(self, domain, **kwargs):
                     f'Missing required arguments: {missing}'
                 )
 
+            # if client credentials use BackendApplicationClient from oauthlib, client suited for client credentials
+            client_credentials = BackendApplicationClient(kwargs['client_id']) if kwargs['client_credentials'] else None
             self.session = BynderOAuth2Session(
                 domain,
                 kwargs['client_id'],
@@ -38,7 +41,9 @@ def __init__(self, domain, **kwargs):
                     'client_id': kwargs['client_id'],
                     'client_secret': kwargs['client_secret']
                 },
-                token_updater=kwargs.get('token_saver', (lambda _: None))
+                token_updater=kwargs.get('token_saver', (lambda _: None)),
+                # if client is None, default to WebApplicationClient which uses authorization_code grant type
+                client=client_credentials
             )
 
             if kwargs.get('token') is not None:

samples/client.py

@@ -39,10 +39,16 @@ def get_auth_client(self) -> BynderClient:
         #         "scope": ["offline"],
         #         "token_type": "bearer"
         #     }
-        if self.config_data.get('token', None) is None:
+
+        # auth code grant type
+        if self.config_data.get('token', None) is None and self.config_data.get('client_credentials', None) is None:
             print(bynder_client.get_authorization_url())
 
             code = input('Code: ')
             print(bynder_client.fetch_token(code))
 
-        return bynder_client
+        # client credentials grant type
+        elif self.config_data.get('token', None) is None and self.config_data.get('client_credentials', None):
+            bynder_client.fetch_token(code=None)
+
+        return bynder_client