<?php
namespace GuzzleHttp;
use GuzzleHttp\Promise\PromiseInterface;
use GuzzleHttp\Psr7;
use Psr\Http\Message\RequestInterface;
/**
* Prepares requests that contain a body, adding the Content-Length,
* Content-Type, and Expect headers.
*/
class PrepareBodyMiddleware
{
/** @var callable */
private $nextHandler;
/**
* @param callable $nextHandler Next handler to invoke.
*/
public function __construct(callable $nextHandler)
{
$this->nextHandler = $nextHandler;
}
/**
* @param RequestInterface $request
* @param array $options
*
* @return PromiseInterface
*/
public function __invoke(RequestInterface $request, array $options)
{
$fn = $this->nextHandler;
// Don't do anything if the request has no body.
if ($request->getBody()->getSize() === 0) {
return $fn($request, $options);
}
$modify = [];
// Add a default content-type if possible.
if (!$request->hasHeader('Content-Type')) {
if ($uri = $request->getBody()->getMetadata('uri')) {
if ($type = Psr7\mimetype_from_filename($uri)) {
$modify['set_headers']['Content-Type'] = $type;
}
}
}
// Add a default content-length or transfer-encoding header.
if (!$request->hasHeader('Content-Length')
&& !$request->hasHeader('Transfer-Encoding')
) {
$size = $request->getBody()->getSize();
if ($size !== null) {
$modify['set_headers']['Content-Length'] = $size;
} else {
$modify['set_headers']['Transfer-Encoding'] = 'chunked';
}
}
// Add the expect header if needed.
$this->addExpectHeader($request, $options, $modify);
return $fn(Psr7\modify_request($request, $modify), $options);
}
private function addExpectHeader(
RequestInterface $request,
array $options,
array &$modify
) {
// Determine if the Expect header should be used
if ($request->hasHeader('Expect')) {
return;
}
$expect = isset($options['expect']) ? $options['expect'] : null;
// Return if disabled or if you're not using HTTP/1.1 or HTTP/2.0
if ($expect === false || $request->getProtocolVersion() < 1.1) {
return;
}
// The expect header is unconditionally enabled
if ($expect === true) {
$modify['set_headers']['Expect'] = '100-Continue';
return;
}
// By default, send the expect header when the payload is > 1mb
if ($expect === null) {
$expect = 1048576;
}
// Always add if the body cannot be rewound, the size cannot be
// determined, or the size is greater than the cutoff threshold
$body = $request->getBody();
$size = $body->getSize();
if ($size === null || $size >= (int) $expect || !$body->isSeekable()) {
$modify['set_headers']['Expect'] = '100-Continue';
}
}
}