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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Nyholm\Psr7;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use InvalidArgumentException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Psr\Http\Message\UriInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Michael Dowling and contributors to guzzlehttp/psr7  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Tobias Nyholm <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                trait RequestTrait  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var string */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $method;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var null|string */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $requestTarget;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var null|UriInterface */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $uri;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getRequestTarget(): string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (null !== $this->requestTarget) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->requestTarget;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $target = $this->uri->getPath();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ('' === $target) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $target = '/';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ('' !== $this->uri->getQuery()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $target .= '?'.$this->uri->getQuery();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $target;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function withRequestTarget($requestTarget): self  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (preg_match('#\s#', $requestTarget)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new InvalidArgumentException('Invalid request target provided; cannot contain whitespace'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $new = clone $this;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $new->requestTarget = $requestTarget;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $new;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function getMethod(): string  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $this->method;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function withMethod($method): self  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!is_string($method)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new \InvalidArgumentException('Method must be a string'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $new = clone $this;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $new->method = $method;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $new;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getUri(): UriInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->uri;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function withUri(UriInterface $uri, $preserveHost = false): self  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($uri === $this->uri) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $new = clone $this;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $new->uri = $uri;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!$preserveHost || !$this->hasHeader('Host')) { | 
            
                            
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                            $new->updateHostFromUri();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $new;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function updateHostFromUri(): void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $host = $this->uri->getHost();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             79                          | 
                
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                        if ('' === $host) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             50                          | 
                
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                            return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             32                          | 
                
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                        if (null !== ($port = $this->uri->getPort())) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $host .= ':'.$port;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             32                          | 
                
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                        if (isset($this->headerNames['host'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $header = $this->headerNames['host'];  | 
            
                            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             32                          | 
                
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                            $header = 'Host';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             32                          | 
                
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                            $this->headerNames['host'] = 'Host';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // Ensure Host is the first header.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // See: http://tools.ietf.org/html/rfc7230#section-5.4  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             32                          | 
                
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                        $this->headers = [$header => [$host]] + $this->headers;  | 
            
                            
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                             32                          | 
                
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idableprovides a methodequalsIdthat in turn relies on the methodgetId(). If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()as an abstract method to the trait will make sure it is available.