advanced-forms / admin / forms / forms-export.php

forms-export.php in Advanced Forms for ACF trunk, at admin/forms/forms-export.php

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1	<?php
2
3	class AF_Admin_Forms_Export {
4
5	private $capability = 'edit_pages';
6
7	function __construct() {
8	add_action( 'admin_menu', array( $this, 'register_admin_page' ), 10, 0 );
9	add_action( 'admin_init', array( $this, 'export_json_file' ), 10, 0 );
10	add_action( 'af/admin/form/actions', array( $this, 'add_export_button' ), 15, 1 );
11	add_filter( 'admin_title', array( $this, 'fix_admin_title' ), 10, 2 );
12	}
13
14	/**
15	* Register hidden admin page for form export.
16	*
17	* @since 1.5.0
18	*/
19	function register_admin_page() {
20	// By using add_submenu_page without a parent the page won't be shown in the admin menu.
21	add_submenu_page(
22	'admin.php',
23	'Export form',
24	'Export',
25	$this->capability,
26	'af_export_form',
27	[ $this, 'export_page' ]
28	);
29	}
30
31	/**
32	* Display form export page
33	*
34	* @since 1.5.0
35	*/
36	function export_page() {
37	if ( ! isset( $_GET['form_id'] ) ) {
38	return;
39	}
40
41	$form_id = $_GET['form_id'];
42	$form = af_form_from_post( $form_id );
43
44	$admin_page_url = menu_page_url( 'af_export_form', false );
45	$form_json_link = add_query_arg( 'form_id', $form_id, $admin_page_url );
46	$form_json_link = add_query_arg( 'export_json', true, $form_json_link );
47
48	// Add nonce to link
49	$form_json_link = $this->add_nonce_to_url( $form_json_link );
50
51	$form_link = get_edit_post_link( $form['post_id'] );
52	$code = $this->generate_form_code( $form );
53	?>
54	<div class="af-form-export wrap">
55	<h1 class="wp-heading-inline"><?php _e( 'Exporting', 'advanced-forms' ); ?> "<?php echo $form['title']; ?>
56	"</h1>
57	<a href="<?php echo $form_link; ?>"
58	class="page-title-action"><?php _e( 'Back to form', 'advanced-forms' ) ?></a>
59	<hr class="wp-header-end"/>
60
61	<div id="poststuff">
62	<div class="postbox">
63	<div class="inside">
64	<h2><?php _e( 'Export JSON', 'advanced-forms' ); ?></h2>
65	<p>
66	<?php _e( 'Export your form as a JSON file. The form can then be imported on any site at Forms → Import.', 'advanced-forms' ); ?>
67	</p>
68	<a class="button button-primary" href="<?php echo $form_json_link; ?>">
69	<?php _e( 'Export file', 'advanced-forms' ); ?>
70	</a>
71	</div>
72
73	<div class="inside">
74	<h2><?php _e( 'Register programmatically', 'advanced-forms' ); ?></h2>
75	<p>
76	<?php _e( 'Place the following code in your theme or plugin to register your form programmatically.', 'advanced-forms' ); ?>
77	<button class="copy-button button button-small" data-copied-text="Copied!">Copy to
78	clipboard
79	</button>
80	</p>
81	<pre class="export-code"><?php echo $code; ?></pre>
82	</div>
83	</div>
84	</div>
85	</div>
86	<?php
87	}
88
89	function add_export_button( $form_id ) {
90	$export_url = add_query_arg( 'form_id', $form_id, menu_page_url( 'af_export_form', false ) );
91	echo sprintf( '<a href="%s" class="button button-large">%s</a>', $export_url, __( 'Export', 'advanced-forms' ) );
92	}
93
94	/**
95	* Wordpress won't display a page title, probably because of the submenu hack in register_admin_page.
96	* This function is hooked to the admin_title filter and fixes the issue.
97	*
98	* @since 1.5.0
99	*/
100	function fix_admin_title( $admin_title, $title ) {
101	if ( get_current_screen()->id != 'admin_page_af_export_form' ) {
102	return $admin_title;
103	}
104
105	return __( 'Export form', 'advanced-forms' ) . $admin_title;
106	}
107
108	function generate_form_code( $form ) {
109	// Remove post ID key
110	unset( $form['post_id'] );
111
112	$str_replace = array(
113	" " => "\t",
114	"'!!__(!!\'" => "__('",
115	"!!\', !!\'" => "', '",
116	"!!\')!!'" => "')",
117	"array (" => "array("
118	);
119	$preg_replace = array(
120	'/([\t\r\n]+?)array/' => 'array',
121	'/[0-9]+ => array/' => 'array'
122	);
123
124	// Create a var_export string of the form array
125	$code = var_export( $form, true );
126
127	// change double spaces to tabs
128	$code = str_replace( array_keys( $str_replace ), array_values( $str_replace ), $code );
129
130	// correctly formats "=> array("
131	$code = preg_replace( array_keys( $preg_replace ), array_values( $preg_replace ), $code );
132
133	$code = esc_textarea( $code );
134
135	$output = "function register_forms() {\n";
136	$output .= sprintf( "\taf_register_form( %s );\n", str_replace( "\n", "\n\t", $code ) );
137	$output .= "}\n";
138	$output .= "add_action( 'af/register_forms', 'register_forms' );";
139
140	return $output;
141	}
142
143	/**
144	* Generate a JSON file for a form and output it to trigger a download.
145	*
146	* @since 1.6.5
147	*/
148	function export_json_file() {
149	if ( ! isset( $_GET['form_id'] ) \|\| ! isset( $_GET['export_json'] ) ) {
150	return;
151	}
152
153	if ( ! current_user_can( $this->capability ) ) {
154	wp_die(
155	__( 'You do not have sufficient permissions to export forms.', 'advanced-forms' ),
156	__( 'Error: Insufficient permissions', 'advanced-forms' ),
157	[ 'back_link' => true ]
158	);
159	}
160
161	if ( ! $this->verify_nonce() ) {
162	wp_die(
163	__( 'Form could not exported due to missing or invalid nonce.', 'advanced-forms' ),
164	__( 'Error: Invalid nonce', 'advanced-forms' ),
165	[ 'back_link' => true ]
166	);
167	}
168
169	$form = af_form_from_post( $_GET['form_id'] );
170
171	// PHP versions below 5.4 don't support JSON_PRETTY_PRINT.
172	$json_pretty_print = 128;
173	$json = wp_json_encode( af_export_form( $form ), $json_pretty_print );
174
175	$file_name = sprintf( '%s.json', $form['key'] );
176	header( 'Content-disposition: attachment; filename=' . $file_name );
177	header( 'Content-type: application/json' );
178
179	echo $json;
180	exit;
181	}
182
183	private function add_nonce_to_url( $url ) {
184	return wp_nonce_url( $url, 'af_export_form', 'af_export_nonce' );
185	}
186
187	private function verify_nonce() {
188	$nonce = isset( $_GET['af_export_nonce'] ) ? $_GET['af_export_nonce'] : '';
189	return wp_verify_nonce( $nonce, 'af_export_form' );
190	}
191
192	}
193
194	return new AF_Admin_Forms_Export();