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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace N98\Magento\Command\Integration;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Magento\Integration\Model\Integration;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Magento\Integration\Model\ResourceModel\Integration\Collection;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use N98\Magento\Command\AbstractMagentoCommand;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use N98\Util\Console\Helper\Table\Renderer\RendererFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Input\InputInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Input\InputOption;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Output\OutputInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class ListCommand  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package N98\Magento\Command\Integration  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class ListCommand extends AbstractMagentoCommand  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var \Magento\Integration\Model\IntegrationFactory  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $integrationFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var \Magento\Integration\Model\OauthService  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $oauthService;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var \Magento\Integration\Model\AuthorizationService  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $authorizationService;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var \Magento\Integration\Model\Oauth\TokenFactory  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $tokenFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function configure()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->setName('integration:list') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->setDescription('List all existing integrations.') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->addOption(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'format',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                null,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                InputOption::VALUE_OPTIONAL,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'Output Format. One of [' . implode(',', RendererFactory::getFormats()) . ']' | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function inject(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        \Magento\Integration\Model\IntegrationFactory $integrationFactory,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        \Magento\Integration\Model\OauthService $oauthService,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        \Magento\Integration\Model\AuthorizationService $authorizationService,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        \Magento\Integration\Model\Oauth\TokenFactory $tokenFactory  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->integrationFactory = $integrationFactory;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->oauthService = $oauthService;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->authorizationService = $authorizationService;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->tokenFactory = $tokenFactory;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \Symfony\Component\Console\Input\InputInterface $input  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \Symfony\Component\Console\Output\OutputInterface $output  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return int|void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws \Exception  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function execute(InputInterface $input, OutputInterface $output)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $integrationModel = $this->integrationFactory->create();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /** @var Collection $collection */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $collection = $integrationModel->getCollection();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $integrations = $collection->getItems();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /** @var Integration $integration */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $table = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($integrations as $integration) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            switch ($integration->getStatus()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                case Integration::STATUS_ACTIVE:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    break;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $table[] = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $integration->getId(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $integration->getName(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $integration->getEmail(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $integration->getEndpoint(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                // return type is not int as defined in Magento. Do not check type strict here.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $integration->getSetupType() == Integration::TYPE_MANUAL ? 'Manual' : 'Config',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                Integration::STATUS_ACTIVE ? 'Active' : 'Inactive',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->getHelper('table') | 
            
                            
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                            ->setHeaders(['id', 'name', 'email', 'endpoint', 'type', 'status'])  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->renderByFormat($output, $table, $input->getOption('format')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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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: