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

embed-pdf-viewer.php in Embed PDF Viewer 2.4.6, 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: 2.4.6
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( 'WPINC' ) ) {
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(
45	'init',
46	function () use ( $epd_version ) {
47	wp_set_script_translations( 'embed-pdf-viewer-scripts', 'embed-pdf-viewer' );
48
49	// phpcs:ignore WordPress.WP.EnqueuedResourceParameters.NoExplicitVersion
50	wp_enqueue_style(
51	'embed-pdf-viewer',
52	plugins_url( 'css/embed-pdf-viewer.css', __FILE__ ),
53	[],
54	$epd_version,
55	'screen'
56	);
57	}
58	);
59	add_action( 'init', [ Embed_PDF_Viewer::instance( $epd_version ), 'register_block' ] );
60
61	/**
62	* Class Embed_PDF_Viewer
63	*/
64	class Embed_PDF_Viewer {
65	/**
66	* For singleton.
67	*
68	* @var bool
69	*/
70	private static $instance = false;
71
72	/**
73	* Plugin version number.
74	*
75	* @var string
76	*/
77	private static $version = '';
78
79	/**
80	* Create singleton.
81	*
82	* @param string $version Plugin version number.
83	* @return bool
84	*/
85	public static function instance( $version ) {
86	static::$version = $version;
87	if ( false === static::$instance ) {
88	static::$instance = new self( $version );
89	}
90
91	return static::$instance;
92	}
93
94	/**
95	* Register block.
96	*
97	* @return void
98	*/
99	public function register_block() {
100	if ( ! function_exists( 'register_block_type' ) ) {
101	return;
102	}
103
104	// phpcs:ignore WordPress.WP.EnqueuedResourceParameters.NoExplicitVersion
105	wp_register_script(
106	'embed-pdf-viewer',
107	plugins_url( 'blocks/build/index.js', __FILE__ ),
108	[ 'wp-i18n', 'wp-blocks', 'wp-block-editor', 'wp-element', 'wp-components', 'wp-compose', 'wp-blob' ],
109	static::$version,
110	true
111	);
112
113	register_block_type(
114	'embed-pdf-viewer/pdf',
115	[
116	'editor_script' => 'embed-pdf-viewer',
117	'render_callback' => [ static::$instance, 'dynamic_render_callback' ],
118	]
119	);
120	}
121
122	/**
123	* Dynamically render callback based on browser.
124	*
125	* @global bool $is_chrome Tests for Chrome browser.
126	*
127	* @param array $attributes Array of attributes.
128	*
129	* @return string
130	*/
131	public function dynamic_render_callback( $attributes ) {
132	global $is_chrome;
133
134	$url = $attributes['url'] ?? null;
135	if ( ! $url ) {
136	return '';
137	}
138
139	$classes = 'embed-pdf-viewer';
140	$src = $is_chrome \|\| wp_is_mobile() ? 'https://docs.google.com/viewer?url=' . rawurlencode( $url ) . '&embedded=true' : $url;
141	$description = $attributes['title'] ?? '';
142	$description = $attributes['description'] ?? $description;
143	$width = $attributes['width'] ?? '600';
144	$height = $attributes['height'] ?? '600';
145	return sprintf(
146	'<iframe class="%1$s" src="%2$s" height="%3$s" width="%4$s" title="%5$s"%6$s></iframe>',
147	$classes,
148	sanitize_url( $src ),
149	esc_attr( $width ),
150	esc_attr( $height ),
151	esc_attr( $description ),
152	$is_chrome \|\| wp_is_mobile() ? ' frameborder="0"' : ''
153	);
154	}
155
156	/**
157	* Insert URL to PDF from Media Library, then render as oEmbed.
158	*
159	* @param string $html an href link to the media.
160	* @param integer $id post_id.
161	*
162	* @return string
163	*/
164	public function embed_pdf_media_editor( $html, $id ) {
165	$post = get_post( $id );
166	if ( 'application/pdf' !== $post->post_mime_type ) {
167	return $html;
168	}
169
170	return $post->guid . "\n\n";
171	}
172
173	/**
174	* Create oEmbed code.
175	*
176	* @param array $matches Regex matches.
177	* @param array $atts array of media height/width.
178	* @param string $url URI for media file.
179	*
180	* @return string\|WP_Error
181	*/
182	public function oembed_pdf_viewer( $matches, $atts, $url ) {
183	$attachment_id = $this->get_attachment_id_by_url( $url );
184	if ( ! empty( $attachment_id ) ) {
185	$post = get_post( $this->get_attachment_id_by_url( $url ) );
186	} else {
187	/*
188	* URL is from outside of the Media Library.
189	*/
190	$response = wp_remote_get( $url );
191	if ( is_wp_error( $response ) ) {
192	return $response;
193	}
194	$post = new WP_Post( new stdClass() );
195	$post->guid = $matches[0];
196	$post->post_mime_type = wp_remote_retrieve_header( $response, 'content-type' );
197	$post->post_name = preg_replace( '/\.pdf$/', '', basename( $matches[0] ) );
198	}
199
200	return $this->create_output( $post, $atts );
201	}
202
203	/**
204	* Create output for iframe and/or Google Doc Viewer and href link to file.
205	*
206	* @param \WP_Post $post Current post.
207	* @param array\|string $atts array of media height/width or
208	* href to media library asset.
209	*
210	* @return bool\|string
211	*/
212	private function create_output( WP_Post $post, $atts = [] ) {
213	global $is_chrome;
214
215	if ( 'application/pdf' !== $post->post_mime_type ) {
216	return $atts;
217	}
218
219	$default = [
220	'height' => 500,
221	'width' => 800,
222	'title' => $post->post_title,
223	'description' => $post->post_content,
224	];
225
226	/*
227	* Ensure $atts isn't the href.
228	*/
229	$atts = is_array( $atts ) ? $atts : [];
230
231	if ( isset( $atts['width'] ) ) {
232	$atts['width'] = '100%';
233	}
234	$atts = array_merge( $default, $atts );
235
236	/**
237	* Filter PDF attributes.
238	*
239	* @since 1.6.0
240	* @param array $atts Array of PDF attributes.
241	* @return array $atts
242	*/
243	$atts = apply_filters( 'embed_pdf_viewer_pdf_attributes', $atts );
244
245	// Fix title or create from filename.
246	$atts['title'] = empty( $atts['title'] )
247	? ucwords( preg_replace( '/(-\|_)/', ' ', $post->post_name ) )
248	: ucwords( preg_replace( '/(-\|_)/', ' ', $atts['title'] ) );
249
250	$description = ! empty( $atts['description'] ) ? $atts['description'] : $atts['title'];
251	$sanitized_url = sanitize_url( $post->guid );
252
253	if ( $is_chrome \|\| wp_is_mobile() ) {
254	$iframe = '<iframe class="embed-pdf-viewer" src="https://docs.google.com/viewer?url=' . rawurlencode( $sanitized_url );
255	$iframe .= '&embedded=true" frameborder="0" ';
256	} else {
257	$iframe = '<iframe class="embed-pdf-viewer" src="' . $sanitized_url . '" ';
258	}
259	$iframe .= 'height="' . esc_attr( $atts['height'] ) . '" width="' . esc_attr( $atts['width'] ) . '" ';
260	$iframe .= 'title="' . esc_attr( $description ) . '"></iframe>' . "\n";
261
262	$embed = '<div>';
263	$embed .= $iframe;
264	$embed .= '<p><a href="' . $sanitized_url . '" title="' . esc_attr( $description ) . '">' . esc_html( $description ) . '</a></p>';
265	$embed .= '</div>';
266
267	return $embed;
268	}
269
270	/**
271	* Get attachment id by url. Thanks Pippin.
272	*
273	* @link https://pippinsplugins.com/retrieve-attachment-id-from-image-url/
274	*
275	* @param string $url URI of attachment.
276	*
277	* @return mixed
278	*/
279	private function get_attachment_id_by_url( $url ) {
280	global $wpdb;
281	// phpcs:ignore WordPress.DB
282	$attachment = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE guid='%s';", $url ) );
283
284	if ( empty( $attachment ) ) {
285	return null;
286	}
287
288	return $attachment[0];
289	}
290	}
291