Fixes client credentials grant for KeycloakAdmin

adds andricDu to contributing

README.md

@@ -55,6 +55,7 @@ The documentation for python-keycloak is available on [readthedocs](http://pytho
 * [Alex](https://bitbucket.org/alex_zel/)
 * [Ewan Jone](https://bitbucket.org/kisamoto/)
 * [Lukas Martini](https://github.com/lutoma)
+* [Dusan Andrc](https://github.com/andricDu)
 
 ## Usage
 

keycloak/keycloak_admin.py

@@ -2279,19 +2279,20 @@ class KeycloakAdmin:
                                               client_secret_key=self.client_secret_key,
                                               custom_headers=self.custom_headers)
 
-        grant_type = ["password"]
-        if self.client_secret_key:
-            grant_type = ["client_credentials"]
-            if self.user_realm_name:
-                self.realm_name = self.user_realm_name
-
-        if self.username and self.password:
-            self._token = self.keycloak_openid.token(self.username, self.password, grant_type=grant_type)
 
-            headers = {
+        def set_token_get_header(identifier, secret, grant):
+            self._token = self.keycloak_openid.token(identifier, secret, grant_type=grant)
+            return {
                 'Authorization': 'Bearer ' + self.token.get('access_token'),
                 'Content-Type': 'application/json'
             }
+
+        if self.client_secret_key:
+            headers = set_token_get_header(self.client_id, self.client_secret_key, ["client_credentials"])
+            if self.user_realm_name:
+                self.realm_name = self.user_realm_name
+        elif self.username and self.password:
+            headers = set_token_get_header(self.username, self.password, ["password"])
         else:
             self._token = None
             headers = {}