weforms / includes / class-form-preview.php

class-form-preview.php in weForms – Easy Drag & Drop Contact Form Builder For WordPress 1.6.2, at includes/class-form-preview.php

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1	<?php
2
3	/**
4	* The preview class
5	*
6	* This is a clever technique to preview a form without having to set any placeholder page by
7	* setting the page templates to singular pages (page.php, single.php and index.php). Setting
8	* the posts per page to 1 and changing the page title and contents dynamiclly allows us to
9	* preview the form without any placeholder page.
10	*
11	* This technique requires the theme to have at least the above mentioned templates in the theme
12	* and requires to have the WordPress Loop, otherwise we wouldn't be able to set the title and
13	* the page content dynamically.
14	*
15	* The technique is borrowed from Ninja Forms (thanks guys!)
16	*/
17	class WeForms_Form_Preview {
18
19	/**
20	* Form id
21	*
22	* @var int
23	*/
24	private $form_id;
25
26	/**
27	* is_preview
28	*
29	* @var string
30	*/
31	private $is_preview = true;
32
33	public function __construct() {
34	if ( !isset( $_GET['weforms_preview'] ) && empty( $_GET['weforms'] ) ) {
35	return;
36	}
37
38	if ( ! empty( $_GET['weforms'] ) ) {
39
40	$hash = explode("_", base64_decode( sanitize_text_field( wp_unslash( $_GET['weforms'] ) ) ) );
41	$_hash = $hash[0];
42	$this->form_id = intval( end( $hash ) );
43	$form = weforms()->form->get( $this->form_id );
44
45	if ( !$form ) {
46	return;
47	}
48
49	$form_settings = $form->get_settings();
50
51	if ( !isset( $form_settings['sharing_on'] ) \|\| $form_settings['sharing_on'] !== 'on' ) {
52	return;
53	}
54
55	if ( !isset( $form_settings['sharing_hash'] ) \|\| $form_settings['sharing_hash'] !== $_hash ) {
56	return;
57	}
58
59	$this->is_preview = false;
60	} else {
61	$this->form_id = isset( $_GET['form_id'] ) ? intval( $_GET['form_id'] ) : 0;
62	}
63
64	add_action( 'pre_get_posts', [ $this, 'pre_get_posts' ] );
65	add_filter( 'template_include', [ $this, 'template_include' ] );
66
67	add_filter( 'the_title', [ $this, 'the_title' ] );
68	add_filter( 'the_content', [ $this, 'the_content' ] );
69	add_filter( 'get_the_excerpt', [ $this, 'the_content' ] );
70	add_filter( 'post_thumbnail_html', '__return_empty_string' );
71	}
72
73	/**
74	* Set the page title
75	*
76	* @param string $title
77	*
78	* @return string
79	*/
80	public function the_title( $title ) {
81	if ( !in_the_loop() ) {
82	return $title;
83	}
84
85	$form = weform_get_form( $this->form_id );
86
87	if ( !$form ) {
88	return $title;
89	}
90
91	$preview = $this->is_preview ? 'Preview' : '';
92
93	return $form->get_name() . ' ' . $preview;
94	}
95
96	/**
97	* Set the content of the page
98	*
99	* @param string $content
100	*
101	* @return string
102	*/
103	public function the_content( $content ) {
104	if ( $this->is_preview ) {
105	if ( !is_user_logged_in() ) {
106	return __( 'You must be logged in to preview this form.', 'weforms' );
107	}
108
109	$viewing_capability = apply_filters( 'weforms_preview_form_cap', 'edit_posts' ); // at least has to be contributor
110
111	if ( !current_user_can( $viewing_capability ) ) {
112	return __( 'Sorry, you are not eligible to preview this form.', 'weforms' );
113	}
114	}
115
116	return do_shortcode( sprintf( '[weforms id="%d"]', $this->form_id ) );
117	}
118
119	/**
120	* Set the posts to one
121	*
122	* @param WP_Query $query
123	*
124	* @return void
125	*/
126	public function pre_get_posts( $query ) {
127	if ( $query->is_main_query() ) {
128	$query->set( 'posts_per_page', 1 );
129	}
130	}
131
132	/**
133	* Limit the page templates to singular pages only
134	*
135	* @return string
136	*/
137	public function template_include() {
138	return locate_template( [ 'page.php', 'single.php', 'index.php' ] );
139	}
140	}
141