408 lines
12 KiB
PHP
408 lines
12 KiB
PHP
<?php
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/**
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* HTTP API: WP_Http_Curl class
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*
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* @package WordPress
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* @subpackage HTTP
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* @since 4.4.0
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*/
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/**
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* Core class used to integrate Curl as an HTTP transport.
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*
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* HTTP request method uses Curl extension to retrieve the url.
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*
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* Requires the Curl extension to be installed.
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*
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* @since 2.7.0
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*/
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class WP_Http_Curl {
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/**
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* Temporary header storage for during requests.
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*
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* @since 3.2.0
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* @var string
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*/
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private $headers = '';
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/**
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* Temporary body storage for during requests.
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*
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* @since 3.6.0
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* @var string
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*/
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private $body = '';
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/**
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* The maximum amount of data to receive from the remote server.
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*
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* @since 3.6.0
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* @var int
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*/
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private $max_body_length = false;
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/**
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* The file resource used for streaming to file.
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*
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* @since 3.6.0
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* @var resource
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*/
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private $stream_handle = false;
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/**
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* The total bytes written in the current request.
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*
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* @since 4.1.0
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* @var int
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*/
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private $bytes_written_total = 0;
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/**
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* Send a HTTP request to a URI using cURL extension.
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*
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* @since 2.7.0
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*
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* @param string $url The request URL.
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* @param string|array $args Optional. Override the defaults.
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* @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
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*/
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public function request( $url, $args = array() ) {
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$defaults = array(
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'method' => 'GET',
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'timeout' => 5,
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'redirection' => 5,
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'httpversion' => '1.0',
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'blocking' => true,
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'headers' => array(),
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'body' => null,
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'cookies' => array(),
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);
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$r = wp_parse_args( $args, $defaults );
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if ( isset( $r['headers']['User-Agent'] ) ) {
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$r['user-agent'] = $r['headers']['User-Agent'];
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unset( $r['headers']['User-Agent'] );
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} elseif ( isset( $r['headers']['user-agent'] ) ) {
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$r['user-agent'] = $r['headers']['user-agent'];
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unset( $r['headers']['user-agent'] );
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}
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// Construct Cookie: header if any cookies are set.
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WP_Http::buildCookieHeader( $r );
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$handle = curl_init();
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// cURL offers really easy proxy support.
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$proxy = new WP_HTTP_Proxy();
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if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
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curl_setopt( $handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP );
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curl_setopt( $handle, CURLOPT_PROXY, $proxy->host() );
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curl_setopt( $handle, CURLOPT_PROXYPORT, $proxy->port() );
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if ( $proxy->use_authentication() ) {
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curl_setopt( $handle, CURLOPT_PROXYAUTH, CURLAUTH_ANY );
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curl_setopt( $handle, CURLOPT_PROXYUSERPWD, $proxy->authentication() );
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}
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}
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$is_local = isset( $r['local'] ) && $r['local'];
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$ssl_verify = isset( $r['sslverify'] ) && $r['sslverify'];
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if ( $is_local ) {
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/** This filter is documented in wp-includes/class-wp-http-streams.php */
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$ssl_verify = apply_filters( 'https_local_ssl_verify', $ssl_verify );
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} elseif ( ! $is_local ) {
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/** This filter is documented in wp-includes/class-wp-http-streams.php */
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$ssl_verify = apply_filters( 'https_ssl_verify', $ssl_verify );
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}
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/*
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* CURLOPT_TIMEOUT and CURLOPT_CONNECTTIMEOUT expect integers. Have to use ceil since.
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* a value of 0 will allow an unlimited timeout.
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*/
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$timeout = (int) ceil( $r['timeout'] );
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curl_setopt( $handle, CURLOPT_CONNECTTIMEOUT, $timeout );
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curl_setopt( $handle, CURLOPT_TIMEOUT, $timeout );
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curl_setopt( $handle, CURLOPT_URL, $url );
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curl_setopt( $handle, CURLOPT_RETURNTRANSFER, true );
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curl_setopt( $handle, CURLOPT_SSL_VERIFYHOST, ( $ssl_verify === true ) ? 2 : false );
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curl_setopt( $handle, CURLOPT_SSL_VERIFYPEER, $ssl_verify );
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if ( $ssl_verify ) {
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curl_setopt( $handle, CURLOPT_CAINFO, $r['sslcertificates'] );
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}
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curl_setopt( $handle, CURLOPT_USERAGENT, $r['user-agent'] );
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/*
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* The option doesn't work with safe mode or when open_basedir is set, and there's
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* a bug #17490 with redirected POST requests, so handle redirections outside Curl.
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*/
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curl_setopt( $handle, CURLOPT_FOLLOWLOCATION, false );
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if ( defined( 'CURLOPT_PROTOCOLS' ) ) { // PHP 5.2.10 / cURL 7.19.4
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curl_setopt( $handle, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS );
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}
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switch ( $r['method'] ) {
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case 'HEAD':
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curl_setopt( $handle, CURLOPT_NOBODY, true );
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break;
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case 'POST':
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curl_setopt( $handle, CURLOPT_POST, true );
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curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );
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break;
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case 'PUT':
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curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, 'PUT' );
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curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );
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break;
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default:
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curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, $r['method'] );
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if ( ! is_null( $r['body'] ) ) {
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curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );
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}
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break;
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}
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if ( true === $r['blocking'] ) {
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curl_setopt( $handle, CURLOPT_HEADERFUNCTION, array( $this, 'stream_headers' ) );
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curl_setopt( $handle, CURLOPT_WRITEFUNCTION, array( $this, 'stream_body' ) );
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}
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curl_setopt( $handle, CURLOPT_HEADER, false );
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if ( isset( $r['limit_response_size'] ) ) {
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$this->max_body_length = intval( $r['limit_response_size'] );
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} else {
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$this->max_body_length = false;
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}
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// If streaming to a file open a file handle, and setup our curl streaming handler.
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if ( $r['stream'] ) {
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if ( ! WP_DEBUG ) {
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$this->stream_handle = @fopen( $r['filename'], 'w+' );
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} else {
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$this->stream_handle = fopen( $r['filename'], 'w+' );
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}
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if ( ! $this->stream_handle ) {
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return new WP_Error(
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'http_request_failed', sprintf(
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/* translators: 1: fopen() 2: file name */
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__( 'Could not open handle for %1$s to %2$s.' ),
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'fopen()',
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$r['filename']
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)
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);
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}
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} else {
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$this->stream_handle = false;
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}
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if ( ! empty( $r['headers'] ) ) {
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// cURL expects full header strings in each element.
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$headers = array();
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foreach ( $r['headers'] as $name => $value ) {
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$headers[] = "{$name}: $value";
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}
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curl_setopt( $handle, CURLOPT_HTTPHEADER, $headers );
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}
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if ( $r['httpversion'] == '1.0' ) {
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curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0 );
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} else {
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curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1 );
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}
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/**
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* Fires before the cURL request is executed.
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*
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* Cookies are not currently handled by the HTTP API. This action allows
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* plugins to handle cookies themselves.
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*
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* @since 2.8.0
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*
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* @param resource $handle The cURL handle returned by curl_init() (passed by reference).
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* @param array $r The HTTP request arguments.
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* @param string $url The request URL.
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*/
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do_action_ref_array( 'http_api_curl', array( &$handle, $r, $url ) );
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// We don't need to return the body, so don't. Just execute request and return.
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if ( ! $r['blocking'] ) {
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curl_exec( $handle );
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if ( $curl_error = curl_error( $handle ) ) {
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curl_close( $handle );
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return new WP_Error( 'http_request_failed', $curl_error );
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}
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if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ) ) ) {
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curl_close( $handle );
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return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );
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}
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curl_close( $handle );
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return array(
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'headers' => array(),
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'body' => '',
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'response' => array(
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'code' => false,
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'message' => false,
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),
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'cookies' => array(),
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);
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}
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curl_exec( $handle );
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$theHeaders = WP_Http::processHeaders( $this->headers, $url );
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$theBody = $this->body;
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$bytes_written_total = $this->bytes_written_total;
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$this->headers = '';
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$this->body = '';
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$this->bytes_written_total = 0;
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$curl_error = curl_errno( $handle );
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// If an error occurred, or, no response.
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if ( $curl_error || ( 0 == strlen( $theBody ) && empty( $theHeaders['headers'] ) ) ) {
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if ( CURLE_WRITE_ERROR /* 23 */ == $curl_error ) {
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if ( ! $this->max_body_length || $this->max_body_length != $bytes_written_total ) {
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if ( $r['stream'] ) {
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curl_close( $handle );
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fclose( $this->stream_handle );
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return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) );
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} else {
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curl_close( $handle );
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return new WP_Error( 'http_request_failed', curl_error( $handle ) );
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}
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}
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} else {
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if ( $curl_error = curl_error( $handle ) ) {
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curl_close( $handle );
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return new WP_Error( 'http_request_failed', $curl_error );
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}
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}
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if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ) ) ) {
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curl_close( $handle );
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return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );
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}
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}
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curl_close( $handle );
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if ( $r['stream'] ) {
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fclose( $this->stream_handle );
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}
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$response = array(
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'headers' => $theHeaders['headers'],
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'body' => null,
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'response' => $theHeaders['response'],
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'cookies' => $theHeaders['cookies'],
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'filename' => $r['filename'],
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);
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// Handle redirects.
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if ( false !== ( $redirect_response = WP_HTTP::handle_redirects( $url, $r, $response ) ) ) {
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return $redirect_response;
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}
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if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode( $theHeaders['headers'] ) ) {
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$theBody = WP_Http_Encoding::decompress( $theBody );
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}
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$response['body'] = $theBody;
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return $response;
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}
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/**
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* Grabs the headers of the cURL request.
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*
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* Each header is sent individually to this callback, so we append to the `$header` property
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* for temporary storage
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*
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* @since 3.2.0
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*
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* @param resource $handle cURL handle.
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* @param string $headers cURL request headers.
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* @return int Length of the request headers.
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*/
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private function stream_headers( $handle, $headers ) {
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$this->headers .= $headers;
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return strlen( $headers );
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}
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/**
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* Grabs the body of the cURL request.
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*
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* The contents of the document are passed in chunks, so we append to the `$body`
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* property for temporary storage. Returning a length shorter than the length of
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* `$data` passed in will cause cURL to abort the request with `CURLE_WRITE_ERROR`.
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*
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* @since 3.6.0
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*
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* @param resource $handle cURL handle.
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* @param string $data cURL request body.
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* @return int Total bytes of data written.
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*/
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private function stream_body( $handle, $data ) {
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$data_length = strlen( $data );
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if ( $this->max_body_length && ( $this->bytes_written_total + $data_length ) > $this->max_body_length ) {
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$data_length = ( $this->max_body_length - $this->bytes_written_total );
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$data = substr( $data, 0, $data_length );
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}
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if ( $this->stream_handle ) {
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$bytes_written = fwrite( $this->stream_handle, $data );
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} else {
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$this->body .= $data;
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$bytes_written = $data_length;
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}
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$this->bytes_written_total += $bytes_written;
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// Upon event of this function returning less than strlen( $data ) curl will error with CURLE_WRITE_ERROR.
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return $bytes_written;
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}
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/**
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* Determines whether this class can be used for retrieving a URL.
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*
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* @static
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* @since 2.7.0
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*
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* @param array $args Optional. Array of request arguments. Default empty array.
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* @return bool False means this class can not be used, true means it can.
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*/
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public static function test( $args = array() ) {
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if ( ! function_exists( 'curl_init' ) || ! function_exists( 'curl_exec' ) ) {
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return false;
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}
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$is_ssl = isset( $args['ssl'] ) && $args['ssl'];
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if ( $is_ssl ) {
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$curl_version = curl_version();
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// Check whether this cURL version support SSL requests.
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if ( ! ( CURL_VERSION_SSL & $curl_version['features'] ) ) {
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return false;
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}
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}
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/**
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* Filters whether cURL can be used as a transport for retrieving a URL.
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*
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* @since 2.7.0
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*
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* @param bool $use_class Whether the class can be used. Default true.
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* @param array $args An array of request arguments.
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*/
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return apply_filters( 'use_curl_transport', true, $args );
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}
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}
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