[DOCS] [FIX] Small fix in error title

docs/source/api/handling_errors.rst

@@ -159,7 +159,7 @@ HTTP status code: 400.
 
 .. _error_2001:
 
-Error 2001: Missing username
+Error 2001: Missing password
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 This error can be thrown on POST requests on ``/auth`` endpoint. 
@@ -277,4 +277,4 @@ FIXME
 Placements
 ----------
 
-FIXME
+FIXME

dpl/auth/auth_manager.py

@@ -157,6 +157,16 @@ def auth_user(self, username: str, password: str) -> str:
 
         return token
 
+    def is_token_valid(self, token: str) -> bool:
+        """
+        Check if the specified token is valid (i.e. is existing, was not
+        revoked and can still be used for auth)
+
+        :param token: an access token to be checked
+        :return: true if token is valid, force otherwise
+        """
+        return self._token_manager.is_token_present(token)
+
     def is_token_grants(self, token: str, requested_action: object) -> bool:
         """
         Check if specified token grants to perform the requested action
@@ -167,4 +177,4 @@ def is_token_grants(self, token: str, requested_action: object) -> bool:
         """
         # TODO: Implement permission checking
 
-        return self._token_manager.is_token_present(token)
+        return self.is_token_valid(token) and True