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<?php
namespace GuzzleHttp\Subscriber;
use GuzzleHttp\Event\BeforeEvent;
use GuzzleHttp\Event\RequestEvents;
use GuzzleHttp\Event\SubscriberInterface;
use GuzzleHttp\Message\RequestInterface;
use GuzzleHttp\Mimetypes;
use GuzzleHttp\Post\PostBodyInterface;
use GuzzleHttp\Stream\StreamInterface;
/**
* Prepares requests with a body before sending
*
* **Request Options**
*
* - expect: Set to true to enable the "Expect: 100-Continue" header for a
* request that send a body. Set to false to disable "Expect: 100-Continue".
* Set to a number so that the size of the payload must be greater than the
* number in order to send the Expect header. Setting to a number will send
* the Expect header for all requests in which the size of the payload cannot
* be determined or where the body is not rewindable.
*/
class Prepare implements SubscriberInterface
{
public function getEvents()
{
return ['before' => ['onBefore', RequestEvents::PREPARE_REQUEST]];
}
public function onBefore(BeforeEvent $event)
{
$request = $event->getRequest();
// Set the appropriate Content-Type for a request if one is not set and
// there are form fields
if (!($body = $request->getBody())) {
return;
}
$this->addContentLength($request, $body);
if ($body instanceof PostBodyInterface) {
// Synchronize the POST body with the request's headers
$body->applyRequestHeaders($request);
} elseif (!$request->hasHeader('Content-Type')) {
$this->addContentType($request, $body);
}
$this->addExpectHeader($request, $body);
}
private function addContentType(
RequestInterface $request,
StreamInterface $body
) {
if (!($uri = $body->getMetadata('uri'))) {
return;
}
// Guess the content-type based on the stream's "uri" metadata value.
// The file extension is used to determine the appropriate mime-type.
if ($contentType = Mimetypes::getInstance()->fromFilename($uri)) {
$request->setHeader('Content-Type', $contentType);
}
}
private function addContentLength(
RequestInterface $request,
StreamInterface $body
) {
// Set the Content-Length header if it can be determined, and never
// send a Transfer-Encoding: chunked and Content-Length header in
// the same request.
if ($request->hasHeader('Content-Length')) {
// Remove transfer-encoding if content-length is set.
$request->removeHeader('Transfer-Encoding');
return;
}
if ($request->hasHeader('Transfer-Encoding')) {
return;
}
if (null !== ($size = $body->getSize())) {
$request->setHeader('Content-Length', $size);
$request->removeHeader('Transfer-Encoding');
} elseif ('1.1' == $request->getProtocolVersion()) {
// Use chunked Transfer-Encoding if there is no determinable
// content-length header and we're using HTTP/1.1.
$request->setHeader('Transfer-Encoding', 'chunked');
$request->removeHeader('Content-Length');
}
}
private function addExpectHeader(
RequestInterface $request,
StreamInterface $body
) {
// Determine if the Expect header should be used
if ($request->hasHeader('Expect')) {
return;
}
$expect = $request->getConfig()['expect'];
// Return if disabled or if you're not using HTTP/1.1
if ($expect === false || $request->getProtocolVersion() !== '1.1') {
return;
}
// The expect header is unconditionally enabled
if ($expect === true) {
$request->setHeader('Expect', '100-Continue');
return;
}
// By default, send the expect header when the payload is > 1mb
if ($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
$size = $body->getSize();
if ($size === null || $size >= (int) $expect || !$body->isSeekable()) {
$request->setHeader('Expect', '100-Continue');
}
}
}
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