PrepareBodyMiddleware.php in Auth0 Single Sign On 8.2

Namespace

GuzzleHttp

File

vendor/guzzlehttp/guzzle/src/PrepareBodyMiddleware.php

<?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);
  }

  /**
   * Add expect header
   *
   * @return void
   */
  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';
    }
  }

}

Classes

Name	Description
PrepareBodyMiddleware	Prepares requests that contain a body, adding the Content-Length, Content-Type, and Expect headers.