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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This file is part of the Superdesk Web Publisher Core Bundle.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Copyright 2018 Sourcefabric z.ú. and contributors.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * For the full copyright and license information, please see the  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * AUTHORS and LICENSE files distributed with this source code.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright 2018 Sourcefabric z.ú  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license http://www.superdesk.org/license  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace SWP\Bundle\CoreBundle\Rule\Applicator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SWP\Bundle\ContentBundle\Model\ArticleInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SWP\Component\Rule\Applicator\AbstractRuleApplicator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SWP\Component\Rule\Model\RuleSubjectInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SWP\Component\Rule\Model\RuleInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\OptionsResolver\OptionsResolver;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                final class PaywallSecuredRuleApplicator extends AbstractRuleApplicator  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $supportedKeys = ['paywallSecured'];  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function apply(RuleInterface $rule, RuleSubjectInterface $subject): void  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $configuration = $this->validateRuleConfiguration($rule->getConfiguration());  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (empty($configuration) || !$this->isAllowedType($subject)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($isPaywallSecured = (bool) $configuration['paywallSecured']) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $subject->setPaywallSecured($isPaywallSecured);  | 
            
                            
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                            $this->logger->info(sprintf(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                'Configuration: paywallSecured for "%s" rule has been applied!',  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                $rule->getExpression()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            ));  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function isSupported(RuleSubjectInterface $subject): bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $subject instanceof ArticleInterface && 'article' === $subject->getSubjectType();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function validateRuleConfiguration(array $configuration): array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $resolver = new OptionsResolver();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->configureOptions($resolver);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->resolveConfig($resolver, $configuration);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function configureOptions(OptionsResolver $resolver): void  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $resolver->setDefaults([  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->supportedKeys[0] => false,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $resolver->setDefined($this->supportedKeys[0]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function isAllowedType(RuleSubjectInterface $subject): bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!$subject instanceof ArticleInterface) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->logger->warning(sprintf(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                '"%s" is not supported by "%s" rule applicator!',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                is_object($subject) ? get_class($subject) : gettype($subject),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                get_class($this)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: