add missing group role APIs (#6057)

* add missing group role apis

* add missing "assign" and "remove" api

lib/core/services/identity-group.service.ts

@@ -60,6 +60,50 @@ export class IdentityGroupService {
         return this.oAuth2Service.get({ url });
     }
 
+    /**
+     * Gets assigned roles
+     * @param groupId Id of the group.
+     * @returns Array of available roles
+     */
+    getAssignedRoles(groupId: string): Observable<IdentityRoleModel[]> {
+        const url = `${this.identityHost}/groups/${groupId}/role-mappings/realm`;
+        return this.oAuth2Service.get({ url });
+    }
+
+    /**
+     * Assigns roles to the group
+     * @param groupId The ID of the group
+     * @param roles Array of roles to assign
+     */
+    assignRoles(groupId: string, roles: IdentityRoleModel[]): Observable<any> {
+        const url = `${this.identityHost}/groups/${groupId}/role-mappings/realm`;
+        const bodyParam = JSON.stringify(roles);
+
+        return this.oAuth2Service.post({ url, bodyParam });
+    }
+
+    /**
+     * Removes roles from the group
+     * @param groupId The ID of the group
+     * @param roles Array of roles to remove
+     */
+    removeRoles(groupId: string, roles: IdentityRoleModel[]): Observable<any> {
+        const url = `${this.identityHost}/groups/${groupId}/role-mappings/realm`;
+        const bodyParam = JSON.stringify(roles);
+
+        return this.oAuth2Service.delete({ url, bodyParam });
+    }
+
+    /**
+     * Get effective roles
+     * @param groupId Id of the group
+     * @returns Array of effective roles
+     */
+    getEffectiveRoles(groupId: string): Observable<IdentityRoleModel[]> {
+        const url = `${this.identityHost}/groups/${groupId}/role-mappings/realm/composite`;
+        return this.oAuth2Service.get({ url });
+    }
+
     /**
      * Queries groups.
      * @returns Array of user information objects