Support prompt parameter

Author: rayluo

msal/application.py

@@ -195,6 +195,7 @@ def get_authorization_request_url(
             state=None,  # Recommended by OAuth2 for CSRF protection
             redirect_uri=None,
             response_type="code",  # Can be "token" if you use Implicit Grant
+            prompt=None,
             **kwargs):
         """Constructs a URL for you to start a Authorization Code Grant.
 
@@ -208,6 +209,11 @@ def get_authorization_request_url(
         :param str response_type:
             Default value is "code" for an OAuth2 Authorization Code grant.
             You can use other content such as "id_token".
+        :param str prompt:
+            By default, no prompt value will be sent, not even "none".
+            You will have to specify a value explicitly.
+            Its valid values are defined in Open ID Connect specs
+            https://openid.net/specs/openid-connect-core-1_0.html#AuthRequest
         :return: The authorization url as a string.
         """
         """ # TBD: this would only be meaningful in a new acquire_token_interactive()
@@ -235,6 +241,7 @@ def get_authorization_request_url(
         return client.build_auth_request_uri(
             response_type=response_type,
             redirect_uri=redirect_uri, state=state, login_hint=login_hint,
+            prompt=prompt,
             scope=decorate_scope(scopes, self.client_id),
             )