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<?php
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namespace GuzzleHttp;
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use GuzzleHttp\Promise\PromiseInterface;
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use GuzzleHttp\Psr7;
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use 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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*/
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class PrepareBodyMiddleware
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{
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/** @var callable */
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private $nextHandler;
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/** @var array */
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private static $skipMethods = ['GET' => true, 'HEAD' => true];
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/**
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* @param callable $nextHandler Next handler to invoke.
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*/
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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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/**
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* @param RequestInterface $request
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* @param array $options
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*
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* @return PromiseInterface
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*/
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public function __invoke(RequestInterface $request, array $options)
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{
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$fn = $this->nextHandler;
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// Don't do anything if the request has no body.
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if (isset(self::$skipMethods[$request->getMethod()])
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|| $request->getBody()->getSize() === 0
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) {
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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 = $request->getBody()->getMetadata('uri')) {
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if ($type = Psr7\mimetype_from_filename($uri)) {
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$modify['set_headers']['Content-Type'] = $type;
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}
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}
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}
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// Add a default content-length or transfer-encoding header.
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if (!isset(self::$skipMethods[$request->getMethod()])
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&& !$request->hasHeader('Content-Length')
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&& !$request->hasHeader('Transfer-Encoding')
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) {
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$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 $fn(Psr7\modify_request($request, $modify), $options);
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}
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private function addExpectHeader(
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RequestInterface $request,
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array $options,
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array &$modify
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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 = isset($options['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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