jetpack / modules / shortcodes / twitter.php

twitter.php in Jetpack – WP Security, Backup, Speed, & Growth 16.0, at modules/shortcodes/twitter.php

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1	<?php
2	/**
3	* Twitter/X oEmbed proxy functionality.
4	*
5	* This file handles proxying Twitter/X oEmbed requests through Automattic's infrastructure
6	* to minimize issues with rate limiting with 404 responses from Twitter/X.
7	*
8	* Unlike tweet.php which handles the [tweet] shortcode, this file provides core oEmbed support
9	* and is force-loaded via module-extras.php regardless of module status.
10	*
11	* @package automattic/jetpack
12	* @since 14.5
13	*/
14
15	use Automattic\Jetpack\Connection\Client;
16	use Automattic\Jetpack\Constants;
17	use Automattic\Jetpack\Status;
18
19	if ( ! defined( 'ABSPATH' ) ) {
20	exit( 0 );
21	}
22
23	/**
24	* Update Twitter providers to use Automattic's Twitter/X oEmbed proxy.
25	*
26	* See paFLeq-3QD-p2.
27	*
28	* @param string $provider The URL of the oEmbed provider.
29	*
30	* @return string The modified URL of the oEmbed provider.
31	*/
32	function jetpack_proxy_twitter_oembed_provider( $provider ) {
33	if ( ! wp_startswith( $provider, 'https://publish.twitter.com/oembed' ) ) {
34	return $provider;
35	}
36
37	// Allow other plugins to override the proxy URL. This constant should be set on the WordPress.com side
38	// to handle proxying after we're authenticated the request with the Jetpack token.
39	$oembed_proxy_url = Constants::is_defined( 'JETPACK__TWITTER_OEMBED_PROXY_URL' )
40	? Constants::get_constant( 'JETPACK__TWITTER_OEMBED_PROXY_URL' )
41	: '';
42
43	// If we don't have a proxy URL, then we'll try to proxy through the WordPress.com.
44	// To that end, we need to make sure that we're connected to WP.com and that we're not in offline mode.
45	if ( empty( $oembed_proxy_url ) ) {
46	if ( ! Jetpack::is_connection_ready() \|\| ( new Status() )->is_offline_mode() ) {
47	return $provider;
48	}
49
50	$oembed_proxy_url = esc_url_raw(
51	sprintf(
52	'%s/wpcom/v2/oembed-proxy',
53	JETPACK__WPCOM_JSON_API_BASE,
54	Jetpack_Options::get_option( 'id' )
55	)
56	);
57
58	add_filter( 'oembed_remote_get_args', 'jetpack_twitter_oembed_remote_get_args', 10, 2 );
59	}
60
61	return str_replace( 'https://publish.twitter.com/oembed', $oembed_proxy_url, $provider );
62	}
63	add_filter( 'oembed_fetch_url', 'jetpack_proxy_twitter_oembed_provider', 10 );
64
65	/**
66	* Add JP auth headers if we're proxying through WP.com.
67	*
68	* @param array $args oEmbed remote get arguments.
69	* @param string $url URL to be inspected.
70	*/
71	function jetpack_twitter_oembed_remote_get_args( $args, $url ) {
72	if ( ! wp_startswith( $url, Constants::get_constant( 'JETPACK__WPCOM_JSON_API_BASE' ) ) ) {
73	return $args;
74	}
75
76	$method = 'GET';
77	$signed_request = Client::build_signed_request(
78	compact( 'url', 'method' )
79	);
80
81	if ( is_wp_error( $signed_request ) ) {
82	return $args;
83	}
84
85	return $signed_request['request'];
86	}
87