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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Created by PhpStorm.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * User: GCC-MED  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Date: 12/03/2018  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Time: 14:36  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace OAuth2\GrantTypes;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use OAuth2\Endpoints\TokenEndpoint;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use OAuth2\Exceptions\OAuthException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use OAuth2\Storages\AccessTokenStorageInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use OAuth2\Storages\RefreshTokenStorageInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class RefreshTokenGrantType extends AbstractGrantType implements GrantTypeInterface  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                { | 
            
            
                                                        
            
                                    
            
            
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                    function handleAccessTokenRequest(TokenEndpoint $tokenEndpoint, array $requestData): array  | 
            
                            
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                    { | 
            
            
                                                        
            
                                    
            
            
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                        if(empty($requestData['refresh_token'])) { | 
            
            
                                                        
            
                                    
            
            
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                            throw new OAuthException('invalid_request', | 
            
            
                                                        
            
                                    
            
            
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                                'The request is missing the required parameter refresh_token.',  | 
            
            
                                                        
            
                                    
            
            
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                                'https://tools.ietf.org/html/rfc7636#section-4.4');  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        $refreshToken = $this->refreshTokenStorage->get($requestData['refresh_token']);  | 
            
            
                                                        
            
                                    
            
            
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                        if(!$refreshToken || $refreshToken->getClientIdentifier() !== $tokenEndpoint->getClient()->getIdentifier()) { | 
            
            
                                                        
            
                                    
            
            
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                            throw new OAuthException('invalid_grant', | 
            
            
                                                        
            
                                    
            
            
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                                'The request includes the invalid parameter refresh_token.',  | 
            
            
                                                        
            
                                    
            
            
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                                'https://tools.ietf.org/html/rfc7636#section-4.4');  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        // TODO Config alwaysRevokeRefreshTokenOnUse  | 
            
            
                                                        
            
                                    
            
            
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                        $this->refreshTokenStorage->revoke($refreshToken->getToken());  | 
            
            
                                                        
            
                                    
            
            
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                        if($this->refreshTokenStorage->hasExpired($refreshToken)) { | 
            
            
                                                        
            
                                    
            
            
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                            throw new OAuthException('invalid_grant', | 
            
            
                                                        
            
                                    
            
            
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                                'The request includes the invalid parameter refresh_token. The token has expired.',  | 
            
            
                                                        
            
                                    
            
            
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                                'https://tools.ietf.org/html/rfc7636#section-4.4');  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        $scope = $refreshToken->getScope();  | 
            
            
                                                        
            
                                    
            
            
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                        if(!empty($requestData['scope'])) { | 
            
            
                                                        
            
                                    
            
            
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                            if(!empty(array_diff(  | 
            
            
                                                        
            
                                    
            
            
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                                explode(' ', $requestData['scope']), | 
            
            
                                                        
            
                                    
            
            
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                                explode(' ', $refreshToken->getScope())))) { | 
            
            
                                                        
            
                                    
            
            
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                                throw new OAuthException('invalid_request', | 
            
            
                                                        
            
                                    
            
            
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                                    'The request includes the invalid parameter scope.',  | 
            
            
                                                        
            
                                    
            
            
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                                    'https://tools.ietf.org/html/rfc7636#section-4.4');  | 
            
            
                                                        
            
                                    
            
            
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                            }  | 
            
            
                                                        
            
                                    
            
            
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                            $scope = $requestData['scope'];  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        // TODO Config issueTokens or only accessToken  | 
            
            
                                                        
            
                                    
            
            
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                        return $this->issueTokens($scope, $refreshToken->getClientIdentifier(), $refreshToken->getResourceOwnerIdentifier());  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                        
Adding explicit visibility (
private,protected, orpublic) is generally recommend to communicate to other developers how, and from where this method is intended to be used.