embed-pdf-viewer / embed-pdf-viewer.php

embed-pdf-viewer.php in Embed PDF Viewer trunk, at embed-pdf-viewer.php

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1	<?php
2	/**
3	* Embed PDF Viewer
4	*
5	* @author Andy Fragen
6	* @license GPL-2.0+
7	* @link https://github.com/afragen/embed-pdf-viewer
8	* @package embed-pdf-viewer
9	*/
10
11	/**
12	* Plugin Name: Embed PDF Viewer
13	* Plugin URI: https://github.com/afragen/embed-pdf-viewer
14	* Description: Embed a PDF from the Media Library or elsewhere via oEmbed or as a block into an `iframe` tag.
15	* Author: Andy Fragen
16	* Author URI: https://github.com/afragen
17	* Version: 2.5.1
18	* License: GPLv2+
19	* Domain Path: /languages
20	* Text Domain: embed-pdf-viewer
21	* License URI: http://www.gnu.org/licenses/gpl-2.0.html
22	* GitHub Plugin URI: https://github.com/afragen/embed-pdf-viewer
23	* Requires PHP: 7.4
24	* Requires at least: 6.0
25	*/
26
27	/**
28	* Exit if called directly.
29	*/
30	if ( ! defined( 'ABSPATH' ) ) {
31	die;
32	}
33
34	$epd_version = get_file_data( __FILE__, [ 'Version' => 'version' ] )['Version'];
35	add_filter( 'media_send_to_editor', [ Embed_PDF_Viewer::instance( $epd_version ), 'embed_pdf_media_editor' ], 20, 2 );
36	wp_embed_register_handler(
37	'oembed_pdf_viewer',
38	'#(^(https?)\:\/\/.+\.pdf$)#i',
39	[
40	Embed_PDF_Viewer::instance( $epd_version ),
41	'oembed_pdf_viewer',
42	]
43	);
44	add_action( 'init', [ Embed_PDF_Viewer::instance( $epd_version ), 'register_block' ] );
45
46	/**
47	* Class Embed_PDF_Viewer
48	*/
49	class Embed_PDF_Viewer {
50	/**
51	* For singleton.
52	*
53	* @var bool
54	*/
55	private static $instance = false;
56
57	/**
58	* Plugin version number.
59	*
60	* @var string
61	*/
62	private static $version = '';
63
64	/**
65	* Create singleton.
66	*
67	* @param string $version Plugin version number.
68	* @return bool
69	*/
70	public static function instance( $version ) {
71	static::$version = $version;
72	if ( false === static::$instance ) {
73	static::$instance = new self( $version );
74	}
75
76	return static::$instance;
77	}
78
79	/**
80	* Register block.
81	*
82	* @return void
83	*/
84	public function register_block() {
85	register_block_type(
86	__DIR__ . '/blocks/block.json',
87	[ 'render_callback' => [ static::$instance, 'dynamic_render_callback' ] ]
88	);
89	}
90
91	/**
92	* Dynamically render callback based on browser.
93	*
94	* @global bool $is_chrome Tests for Chrome browser.
95	*
96	* @param array $attributes Array of attributes.
97	*
98	* @return string
99	*/
100	public function dynamic_render_callback( $attributes ) {
101	global $is_chrome;
102
103	$url = $attributes['url'] ?? null;
104	if ( ! $url ) {
105	return '';
106	}
107
108	$classes = 'embed-pdf-viewer';
109	$src = $is_chrome \|\| wp_is_mobile() ? 'https://docs.google.com/viewer?url=' . rawurlencode( $url ) . '&embedded=true' : $url;
110	$description = $attributes['title'] ?? '';
111	$description = $attributes['description'] ?? $description;
112	$width = $attributes['width'] ?? '600';
113	$height = $attributes['height'] ?? '600';
114	$iframe = sprintf(
115	'<iframe class="%1$s" src="%2$s" height="%3$s" width="%4$s" title="%5$s"%6$s></iframe>',
116	$classes,
117	sanitize_url( $src ),
118	esc_attr( $height ),
119	esc_attr( $width ),
120	esc_attr( $description ),
121	$is_chrome \|\| wp_is_mobile() ? ' frameborder="0"' : ''
122	);
123	$wrapper = get_block_wrapper_attributes( [ 'class' => 'embed-pdf-viewer-wrapper' ] );
124	return sprintf( '<div %1$s>%2$s</div>', $wrapper, $iframe );
125	}
126
127	/**
128	* Insert URL to PDF from Media Library, then render as oEmbed.
129	*
130	* @param string $html an href link to the media.
131	* @param integer $id post_id.
132	*
133	* @return string
134	*/
135	public function embed_pdf_media_editor( $html, $id ) {
136	$post = get_post( $id );
137	if ( 'application/pdf' !== $post->post_mime_type ) {
138	return $html;
139	}
140
141	return $post->guid . "\n\n";
142	}
143
144	/**
145	* Create oEmbed code.
146	*
147	* @param array $matches Regex matches.
148	* @param array $atts array of media height/width.
149	* @param string $url URI for media file.
150	*
151	* @return string\|WP_Error
152	*/
153	public function oembed_pdf_viewer( $matches, $atts, $url ) {
154	$attachment_id = $this->get_attachment_id_by_url( $url );
155	if ( ! empty( $attachment_id ) ) {
156	$post = get_post( $attachment_id );
157	} else {
158	/*
159	* URL is from outside of the Media Library.
160	*/
161	$response = wp_safe_remote_get( $url );
162	if ( is_wp_error( $response ) ) {
163	return $response;
164	}
165	$post = new WP_Post( new stdClass() );
166	$post->guid = $matches[0];
167	$post->post_mime_type = wp_remote_retrieve_header( $response, 'content-type' );
168	$post->post_name = preg_replace( '/\.pdf$/', '', basename( $matches[0] ) );
169	}
170
171	wp_enqueue_style(
172	'embed-pdf-viewer',
173	plugins_url( 'blocks/build/style-index.css', __FILE__ ),
174	[],
175	static::$version
176	);
177
178	return $this->create_output( $post, $atts );
179	}
180
181	/**
182	* Create output for iframe and/or Google Doc Viewer and href link to file.
183	*
184	* @param \WP_Post $post Current post.
185	* @param array\|string $atts array of media height/width or
186	* href to media library asset.
187	*
188	* @return bool\|string
189	*/
190	private function create_output( WP_Post $post, $atts = [] ) {
191	global $is_chrome;
192
193	if ( 'application/pdf' !== $post->post_mime_type ) {
194	return $atts;
195	}
196
197	$default = [
198	'height' => 500,
199	'width' => 800,
200	'title' => $post->post_title,
201	'description' => $post->post_content,
202	];
203
204	/*
205	* Ensure $atts isn't the href.
206	*/
207	$atts = is_array( $atts ) ? $atts : [];
208
209	if ( isset( $atts['width'] ) ) {
210	$atts['width'] = '100%';
211	}
212	$atts = array_merge( $default, $atts );
213
214	/**
215	* Filter PDF attributes.
216	*
217	* @since 1.6.0
218	* @param array $atts Array of PDF attributes.
219	* @return array $atts
220	*/
221	$atts = apply_filters( 'embed_pdf_viewer_pdf_attributes', $atts );
222
223	// Fix title or create from filename.
224	$atts['title'] = empty( $atts['title'] )
225	? ucwords( preg_replace( '/(-\|_)/', ' ', $post->post_name ) )
226	: ucwords( preg_replace( '/(-\|_)/', ' ', $atts['title'] ) );
227
228	$description = ! empty( $atts['description'] ) ? $atts['description'] : $atts['title'];
229	$sanitized_url = sanitize_url( $post->guid );
230
231	if ( $is_chrome \|\| wp_is_mobile() ) {
232	$iframe = '<iframe class="embed-pdf-viewer" src="https://docs.google.com/viewer?url=' . rawurlencode( $sanitized_url );
233	$iframe .= '&embedded=true" frameborder="0" ';
234	} else {
235	$iframe = '<iframe class="embed-pdf-viewer" src="' . $sanitized_url . '" ';
236	}
237	$iframe .= 'height="' . esc_attr( $atts['height'] ) . '" width="' . esc_attr( $atts['width'] ) . '" ';
238	$iframe .= 'title="' . esc_attr( $description ) . '"></iframe>' . "\n";
239
240	$embed = '<div>';
241	$embed .= $iframe;
242	$embed .= '<p><a href="' . $sanitized_url . '" title="' . esc_attr( $description ) . '">' . esc_html( $description ) . '</a></p>';
243	$embed .= '</div>';
244
245	return $embed;
246	}
247
248	/**
249	* Get attachment id by url.
250	*
251	* @param string $url URI of attachment.
252	*
253	* @return int\|null
254	*/
255	private function get_attachment_id_by_url( $url ) {
256	$attachment = attachment_url_to_postid( $url );
257
258	return empty( $attachment ) ? null : $attachment;
259	}
260	}
261