unauth-file-upload.php — Jetpack – WP Security, Backup, Speed, & Growth 14.9.2

jetpack / unauth-file-upload.php

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unauth-file-upload.php

159 lines

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