human
Solve the following python programming problem given the following code:
def require_oauth(self, realm = None, require_resource_owner = True, require_verifier = False, require_realm = False) : 
    'Mark the view function f as a protected resource' 
    def decorator(f) : 
        @ wraps (f) 
        def verify_request(* args, **kwargs) : 
            'Verify OAuth params before running view function f' 
            try : 
                if request.form : 
                    body = request.form.to_dict () 
else : 
                    body = request.data.decode ('utf-8') 
verify_result = self.verify_request (request.url.decode ('utf-8'), http_method = request.method.decode ('utf-8'), body = body, headers = request.headers, require_resource_owner = require_resource_owner, require_verifier = require_verifier, require_realm = (require_realm or bool (realm)), required_realm = realm) 
                (valid, oauth_request) = verify_result 
                if valid : 
                    request.oauth = self.collect_request_parameters (request) 
                    token = { 
                        
} 
                    if require_verifier : 
                        token ['request_token'] = request.oauth.resource_owner_key 
else : 
                        token ['access_token'] = request.oauth.resource_owner_key 
self.save_timestamp_and_nonce (request.oauth.client_key, request.oauth.timestamp, request.oauth.nonce, ** token) 
                    return f (* args, ** kwargs) 
else : 
                    raise Unauthorized () 
except ValueError as err : 
                raise BadRequest (err.message) 
return verify_request 
return require_realm 

    
    

    Fix the buggy line: return require_realm
assistant
#Here is Python program to fix the buggy line: return require_realm
.

return def decorator(