unauth-file-upload.php at 15.0 · Jetpack – WP Security, Backup, Speed, & Growth

jetpack / unauth-file-upload.php

unauth-file-upload.php

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1	<?php
2	/**
3	* Unauthenticated File Upload Helper Functions.
4	*
5	* @package automattic/jetpack
6	*/
7
8	namespace Automattic\Jetpack\UnauthFileUpload;
9
10	if ( ! defined( 'ABSPATH' ) ) {
11	exit( 0 );
12	}
13
14	add_action( 'wp_ajax_jetpack_unauth_file_download', __NAMESPACE__ . '\handle_file_download' );
15	add_filter( 'jetpack_unauth_file_upload_get_file', __NAMESPACE__ . '\get_file_content', 10, 2 );
16	add_filter( 'jetpack_unauth_file_download_url', __NAMESPACE__ . '\filter_get_download_url', 10, 2 );
17
18	/**
19	* Get the file download URL filter callback.
20	*
21	* @param string $url The file download URL.
22	* @param int $file_id The file ID.
23	*
24	* @return string The file download URL.
25	*/
26	function filter_get_download_url( $url, $file_id ) {
27	$nonce = wp_create_nonce( 'jetpack_unauth_file_download_nonce_' . $file_id );
28	return add_query_arg(
29	array(
30	'action' => 'jetpack_unauth_file_download',
31	'file_id' => $file_id,
32	'_wpnonce' => $nonce,
33	),
34	admin_url( 'admin-ajax.php' )
35	);
36	}
37
38	/**
39	* Handle file download requests from the admin page.
40	*
41	* @return never This method never returns as it exits directly
42	*/
43	function handle_file_download() {
44	if ( ! current_user_can( 'edit_pages' ) ) {
45	wp_die( esc_html__( 'Sorry, you are not allowed to access this page.', 'jetpack' ) );
46	}
47
48	$file_id = isset( $_GET['file_id'] ) ? absint( wp_unslash( $_GET['file_id'] ) ) : 0;
49
50	if ( ! $file_id ) {
51	wp_die( esc_html__( 'Invalid file request.', 'jetpack' ) );
52	}
53
54	if (
55	! isset( $_GET['_wpnonce'] ) \|\|
56	! wp_verify_nonce( sanitize_text_field( wp_unslash( $_GET['_wpnonce'] ) ), 'jetpack_unauth_file_download_nonce_' . $file_id ) ) {
57	wp_die( esc_html__( 'Invalid nonce.', 'jetpack' ) );
58	}
59
60	/**
61	* Get the file content that we send to the user to download.
62	*
63	* @since 14.6
64	*
65	* @param array $file_content The file content.
66	* @param string $file_id The file ID.
67	*
68	* @return array\|\WP_Error The file array, containing the content, name and type.
69	*/
70	$file = apply_filters( 'jetpack_unauth_file_upload_get_file', array(), $file_id );
71
72	if ( is_wp_error( $file ) \|\| empty( $file ) ) {
73	wp_die( esc_html__( 'Error retrieving file content.', 'jetpack' ) );
74	}
75
76	$is_preview = isset( $_GET['preview'] ) && 'true' === $_GET['preview'];
77
78	// Clean output buffer
79	if ( ob_get_length() ) {
80	ob_clean();
81	}
82	// Set headers for download
83	header( 'Content-Type: ' . $file['type'] );
84
85	if ( ! $is_preview ) {
86	// Forcing the file to be downloaded is important to prevent XSS attacks.
87	header( 'Content-Disposition: attachment; filename="' . sanitize_file_name( $file['name'] ) . '"' );
88	} else {
89	// For preview mode, use inline disposition
90	header( 'Content-Disposition: inline; filename="' . sanitize_file_name( $file['name'] ) . '"' );
91	}
92	header( 'Content-Length: ' . strlen( $file['content'] ) );
93	header( 'Content-Transfer-Encoding: binary' );
94	header( 'Cache-Control: no-cache, must-revalidate, max-age=0' );
95	header( 'Pragma: no-cache' );
96	header( 'Expires: 0' );
97
98	// Output file content and exit
99	echo $file['content']; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Binary file data
100	exit( 0 );
101	}
102
103	/**
104	* Get the file content.
105	*
106	* @param array $file_content The file content, name and type.
107	* @param integer $file_id The file ID.
108	* @return array\|\WP_Error The file content, name and type
109	*/
110	function get_file_content( $file_content, $file_id ) {
111	if ( ( new \Automattic\Jetpack\Status\Host() )->is_wpcom_simple() ) {
112	return $file_content;
113	}
114
115	$blog_id = \Jetpack_Options::get_option( 'id' );
116	$request_url = sprintf( '/sites/%d/unauth-file-upload/%s', $blog_id, $file_id );
117
118	$response = \Automattic\Jetpack\Connection\Client::wpcom_json_api_request_as_blog(
119	$request_url,
120	'v2',
121	array(
122	'method' => 'GET',
123	),
124	null,
125	'wpcom'
126	);
127
128	$file_content = wp_remote_retrieve_body( $response );
129
130	if ( is_wp_error( $response ) \|\| empty( $file_content ) ) {
131	return new \WP_Error( 'jetpack_unauth_file_upload_error', esc_html__( 'Error retrieving file content.', 'jetpack' ) );
132	}
133
134	try {
135	$content = json_decode( $file_content, true, 3, defined( 'JSON_THROW_ON_ERROR' ) ? \JSON_THROW_ON_ERROR : 0 ); // phpcs:ignore PHPCompatibility.Constants.NewConstants.json_throw_on_errorFound
136	if ( isset( $content['message'] ) ) {
137	return new \WP_Error( 'jetpack_unauth_file_upload_error', esc_html__( 'Error retrieving file content.', 'jetpack' ) );
138	}
139	} catch ( \Exception $e ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch
140	// If the file is not JSON, we assume it's a binary file.
141	}
142
143	$content_disposition = wp_remote_retrieve_header( $response, 'content-disposition' );
144	$filename = '';
145	if ( $content_disposition ) {
146	// Match the filename using a regular expression
147	if ( preg_match( '/filename="([^"]+)"/', $content_disposition, $matches ) ) {
148	$filename = $matches[1]; // Extract the filename
149	}
150	}
151
152	$type = wp_remote_retrieve_header( $response, 'content-type' );
153	if ( empty( $type ) ) {
154	$type = 'application/octet-stream'; // Default to binary if no content type is found
155	}
156
157	return array(
158	'content' => $file_content,
159	'type' => $type,
160	'name' => $filename,
161	);
162	}
163