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<?php

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namespace YoastSEO_Vendor\GuzzleHttp;

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use YoastSEO_Vendor\GuzzleHttp\Promise\PromiseInterface;

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use YoastSEO_Vendor\Psr\Http\Message\RequestInterface;

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/**

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* Prepares requests that contain a body, adding the Content-Length,

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* Content-Type, and Expect headers.

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* @final

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class PrepareBodyMiddleware

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{

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/**

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* @var callable(RequestInterface, array): PromiseInterface

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private $nextHandler;

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/**

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* @param callable(RequestInterface, array): PromiseInterface $nextHandler Next handler to invoke.

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public function __construct(callable $nextHandler)

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{

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$this->nextHandler = $nextHandler;

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}

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public function __invoke(\YoastSEO_Vendor\Psr\Http\Message\RequestInterface $request, array $options) : \YoastSEO_Vendor\GuzzleHttp\Promise\PromiseInterface

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{

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$fn = $this->nextHandler;

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// Don't do anything if the request has no body.

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if ($request->getBody()->getSize() === 0) {

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return $fn($request, $options);

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}

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$modify = [];

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// Add a default content-type if possible.

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if (!$request->hasHeader('Content-Type')) {

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if ($uri = $request->getBody()->getMetadata('uri')) {

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if (\is_string($uri) && ($type = \YoastSEO_Vendor\GuzzleHttp\Psr7\MimeType::fromFilename($uri))) {

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$modify['set_headers']['Content-Type'] = $type;

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}

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}

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}

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// Add a default content-length or transfer-encoding header.

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if (!$request->hasHeader('Content-Length') && !$request->hasHeader('Transfer-Encoding')) {

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$size = $request->getBody()->getSize();

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if ($size !== null) {

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$modify['set_headers']['Content-Length'] = $size;

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} else {

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$modify['set_headers']['Transfer-Encoding'] = 'chunked';

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}

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}

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// Add the expect header if needed.

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$this->addExpectHeader($request, $options, $modify);

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return $fn(\YoastSEO_Vendor\GuzzleHttp\Psr7\Utils::modifyRequest($request, $modify), $options);

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}

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/**

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* Add expect header

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private function addExpectHeader(\YoastSEO_Vendor\Psr\Http\Message\RequestInterface $request, array $options, array &$modify) : void

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{

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// Determine if the Expect header should be used

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if ($request->hasHeader('Expect')) {

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return;

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}

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$expect = $options['expect'] ?? null;

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// Return if disabled or if you're not using HTTP/1.1 or HTTP/2.0

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if ($expect === \false || $request->getProtocolVersion() < 1.1) {

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return;

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}

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// The expect header is unconditionally enabled

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if ($expect === \true) {

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$modify['set_headers']['Expect'] = '100-Continue';

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return;

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}

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// By default, send the expect header when the payload is > 1mb

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if ($expect === null) {

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$expect = 1048576;

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}

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// Always add if the body cannot be rewound, the size cannot be

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// determined, or the size is greater than the cutoff threshold

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$body = $request->getBody();

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$size = $body->getSize();

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if ($size === null || $size >= (int) $expect || !$body->isSeekable()) {

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$modify['set_headers']['Expect'] = '100-Continue';

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}

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}

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}

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