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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Micro  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright Copyright (c) 2017 gyselroth GmbH (https://gyselroth.com)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license   MIT https://opensource.org/licenses/MIT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Micro\Auth\Adapter\Basic;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use \Micro\Auth\Exception;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use \Psr\Log\LoggerInterface as Logger;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use \Micro\Auth\Adapter\AdapterInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use \Micro\Auth\Adapter\AbstractAdapter;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                abstract class AbstractBasic extends AbstractAdapter  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Authenticate  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function authenticate(): bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!isset($_SERVER['HTTP_AUTHORIZATION'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->logger->debug('skip auth adapter ['.get_class($this).'], no http authorization header found', [ | 
            
                            
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                                'category' => get_class($this)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $header = $_SERVER['HTTP_AUTHORIZATION'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $parts  = explode(' ', $header); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($parts[0] == 'Basic') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->logger->debug('found http basic authorization header', [ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'category' => get_class($this)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $username = $_SERVER['PHP_AUTH_USER'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $password = $_SERVER['PHP_AUTH_PW'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->plainAuth($username, $password);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->logger->warning('http authorization header contains no basic string or invalid authentication string', [ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'category' => get_class($this)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Auth  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param   string $username  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param   string $password  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return  bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function plainAuth(string $username, string $password): bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $result = $this->findIdentity($username);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($result === null) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->logger->info('found no user named ['.$username.'] in database', [ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'category' => get_class($this)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!isset($result['password']) || empty($result['password'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->logger->info('found no password for ['.$username.'] in database', [ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'category' => get_class($this)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!password_verify($password, $result['password'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->logger->info('failed match given password for ['.$username.'] with stored hash in database', [ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'category' => get_class($this)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->identifier  = $username;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Find Identity  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  string $username  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    protected abstract function findIdentity(string $username): ?array;  | 
            
                            
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                }  | 
            
            
                                                        
            
                                    
            
            
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: