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Editing: Curl.php

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<?php
// phpcs:disable WordPress.WP.AlternativeFunctions.curl_curl_setopt_array, WordPress.WP.AlternativeFunctions.curl_curl_setopt, WordPress.WP.AlternativeFunctions.curl_curl_init, WordPress.WP.AlternativeFunctions.curl_curl_exec, WordPress.WP.AlternativeFunctions.curl_curl_getinfo, WordPress.WP.AlternativeFunctions.curl_curl_multi_init, WordPress.WP.AlternativeFunctions.curl_curl_multi_add_handle, WordPress.WP.AlternativeFunctions.curl_curl_multi_exec, WordPress.WP.AlternativeFunctions.curl_curl_multi_select, WordPress.WP.AlternativeFunctions.curl_curl_multi_getcontent, WordPress.WP.AlternativeFunctions.curl_curl_multi_remove_handle, WordPress.WP.AlternativeFunctions.curl_curl_multi_close, WordPress.WP.AlternativeFunctions.curl_curl_error, WordPress.WP.AlternativeFunctions.curl_curl_close, WordPress.WP.AlternativeFunctions.curl_curl_errno -- Direct cURL usage is intentional to leverage specific low-level options not available via the WordPress HTTP API.
/*
 * Copyright 2014 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Curl based implementation of Google_IO.
 *
 * @author Stuart Langley <slangley@google.com>
 */

if (!defined('ABSPATH')) die('No direct access allowed');

if (!class_exists('UDP_Google_Client')) {
  require_once dirname(__FILE__) . '/../autoload.php';
}

class UDP_Google_IO_Curl extends UDP_Google_IO_Abstract
{
  // cURL hex representation of version 7.30.0
  const NO_QUIRK_VERSION = 0x071E00;

private $options = array();

public function __construct(UDP_Google_Client $client)
  {
    if (!extension_loaded('curl')) {
      $error = 'The cURL IO handler requires the cURL extension to be enabled';
      $client->getLogger()->critical($error);
      throw new UDP_Google_IO_Exception($error); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Error message to be escaped when caught and printed.
    }

parent::__construct($client);
  }

/**
   * Execute an HTTP Request
   *
   * @param Google_Http_Request $request the http request to be executed
   * @return array containing response headers, body, and http code
   * @throws UDP_Google_IO_Exception on curl or IO error
   */
  public function executeRequest(UDP_Google_Http_Request $request)
  {
    $curl = curl_init();

if ($request->getPostBody()) {
      curl_setopt($curl, CURLOPT_POSTFIELDS, $request->getPostBody());
    }

$requestHeaders = $request->getRequestHeaders();
    if ($requestHeaders && is_array($requestHeaders)) {
      $curlHeaders = array();
      foreach ($requestHeaders as $k => $v) {
        $curlHeaders[] = "$k: $v";
      }
      curl_setopt($curl, CURLOPT_HTTPHEADER, $curlHeaders);
    }
    curl_setopt($curl, CURLOPT_URL, $request->getUrl());

curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $request->getRequestMethod());
    curl_setopt($curl, CURLOPT_USERAGENT, $request->getUserAgent());

curl_setopt($curl, CURLOPT_FOLLOWLOCATION, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
    // 1 is CURL_SSLVERSION_TLSv1, which is not always defined in PHP.
// UpdraftPlus patch
// The SDK leaves this on the default setting in later releases
//     curl_setopt($curl, CURLOPT_SSLVERSION, 1);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_HEADER, true);

if ($request->canGzip()) {
      curl_setopt($curl, CURLOPT_ENCODING, 'gzip,deflate');
    }
    
    $options = $this->client->getClassConfig('UDP_Google_IO_Curl', 'options');
    if (is_array($options)) {
      $this->setOptions($options);
    }
    
    foreach ($this->options as $key => $var) {
      curl_setopt($curl, $key, $var);
    }

if (!isset($this->options[CURLOPT_CAINFO])) {
      curl_setopt($curl, CURLOPT_CAINFO, dirname(__FILE__) . '/cacerts.pem');
    }

$this->client->getLogger()->debug(
        'cURL request',
        array(
            'url' => $request->getUrl(),
            'method' => $request->getRequestMethod(),
            'headers' => $requestHeaders,
            'body' => $request->getPostBody()
        )
    );

$response = curl_exec($curl);
    if ($response === false) {
      $error = curl_error($curl);
      $code = curl_errno($curl);
      $map = $this->client->getClassConfig('UDP_Google_IO_Exception', 'retry_map');

$this->client->getLogger()->error('cURL ' . $error);
      throw new UDP_Google_IO_Exception($error, $code, null, $map); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Error message to be escaped when caught and printed.
    }
    $headerSize = curl_getinfo($curl, CURLINFO_HEADER_SIZE);

list($responseHeaders, $responseBody) = $this->parseHttpResponse($response, $headerSize);
    $responseCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);

$this->client->getLogger()->debug(
        'cURL response',
        array(
            'code' => $responseCode,
            'headers' => $responseHeaders,
            'body' => $responseBody,
        )
    );

return array($responseBody, $responseHeaders, $responseCode);
  }

/**
   * Set options that update the transport implementation's behavior.
   * @param $options
   */
  public function setOptions($options)
  {
    $this->options = $options + $this->options;
  }

/**
   * Set the maximum request time in seconds.
   * @param $timeout in seconds
   */
  public function setTimeout($timeout)
  {
    // Since this timeout is really for putting a bound on the time
    // we'll set them both to the same. If you need to specify a longer
    // CURLOPT_TIMEOUT, or a higher CONNECTTIMEOUT, the best thing to
    // do is use the setOptions method for the values individually.
    $this->options[CURLOPT_CONNECTTIMEOUT] = $timeout;
    $this->options[CURLOPT_TIMEOUT] = $timeout;
  }

/**
   * Get the maximum request time in seconds.
   * @return timeout in seconds
   */
  public function getTimeout()
  {
    return $this->options[CURLOPT_TIMEOUT];
  }

/**
   * Test for the presence of a cURL header processing bug
   *
   * {@inheritDoc}
   *
   * @return boolean
   */
  protected function needsQuirk()
  {
    $ver = curl_version();
    $versionNum = $ver['version_number'];
    return $versionNum < UDP_Google_IO_Curl::NO_QUIRK_VERSION;
  }
}

Editing: Curl.php

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