wp-optimize / includes / class-wpo-page-optimizer.php

class-wpo-page-optimizer.php in WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance 4.5.2, at includes/class-wpo-page-optimizer.php

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1	<?php
2
3	if (!defined('ABSPATH')) die('Access denied.');
4
5	if (!class_exists('WPO_Page_Optimizer')) :
6	class WPO_Page_Optimizer {
7
8	/**
9	* Instance of this class
10	*
11	* @var null\|WPO_Page_Optimizer
12	*/
13	private static $instance = null;
14
15	/**
16	* Constructor
17	*/
18	private function __construct() {
19	// Initialize WP_Optimize_Minify_Config to make available wp_optimize_minify_config()
20	WP_Optimize_Minify_Config::get_instance();
21	// Include page cache function to make available wpo_is_cacheable_sitemap_request() function
22	$this->include_page_cache_functions();
23	}
24
25	/**
26	* Get the buffer and perform tasks related to page optimization
27	*
28	* @param string $buffer Page HTML.
29	* @param int $flags OB flags to be passed through.
30	*
31	* @return string
32	*/
33	private function optimize($buffer, $flags): string {
34	$buffer = apply_filters('wp_optimize_buffer', $buffer, $flags);
35
36	if (WP_Optimize_Utils::is_valid_html($buffer)) {
37	$buffer = $this->maybe_host_google_fonts_locally($buffer);
38	$buffer = $this->maybe_remove_unused_css($buffer);
39	$buffer = $this->maybe_apply_capojs_rules($buffer);
40	$buffer = $this->maybe_add_missing_image_dimensions($buffer);
41	$buffer = $this->maybe_delay_js($buffer);
42	$buffer = $this->maybe_alter_html_for_webp($buffer);
43	}
44	$buffer = $this->maybe_cache_page($buffer, $flags);
45	return $buffer;
46	}
47
48	/**
49	* Cache the page if the page cache enabled
50	*
51	* @param string $buffer Page HTML.
52	* @param int $flags OB flags to be passed through.
53	*
54	* @return string
55	*/
56	private function maybe_cache_page($buffer, $flags) {
57
58	if (!$this->is_wp_cli() && WP_Optimize()->get_page_cache()->should_cache_page()) {
59	return wpo_cache($buffer, $flags);
60	}
61
62	return $buffer;
63	}
64
65	/**
66	* Optimize head tags sequence to make a web page load optimally
67	*
68	* @param string $buffer source HTML page
69	* @return string
70	*/
71	private function maybe_apply_capojs_rules($buffer) {
72
73	if (WP_Optimize::is_premium() && WP_Optimize_CapoJS_Rules::get_instance()->should_apply_capojs_rules($buffer)) {
74	$buffer = WP_Optimize_CapoJS_Rules::get_instance()->optimize($buffer);
75	}
76	return $buffer;
77	}
78
79	/**
80	* Hosts Google Fonts locally from the provided HTML and the CSS files included in it when the option is enabled.
81	*
82	* @param string $buffer
83	* @return string
84	*/
85	private function maybe_host_google_fonts_locally(string $buffer): string {
86	if (WP_Optimize::is_premium() && wp_optimize_minify_config()->get('host_local_google_fonts')) {
87	$buffer = WP_Optimize_Host_Google_Fonts::instance()->update_gfont_urls_in_html($buffer);
88	}
89
90	return $buffer;
91	}
92
93	/**
94	* Remove unused css
95	*
96	* @param String $buffer Page HTML.
97	*
98	* @return String
99	*/
100	private function maybe_remove_unused_css($buffer) {
101
102	if (is_user_logged_in()) return $buffer;
103
104	if (WP_Optimize::is_premium() && wp_optimize_minify_config()->get('enable_unused_css')) {
105	$unused_css_class = WP_Optimize_Minify_Unused_Css::get_instance();
106	return $unused_css_class->remove_unused_css($buffer);
107	}
108	return $buffer;
109	}
110
111	/**
112	* Check if we should initialise page optimizer.
113	*
114	* @return boolean
115	*/
116	private function should_initialise() {
117
118	// Skip admin, AJAX, WP-CLI, cron, static assets and page builder edit modes.
119	if (is_admin() \|\| $this->is_ajax() \|\| $this->is_wp_cli() \|\| $this->is_cron_job() \|\| $this->is_static_asset_request() \|\| WPO_Page_Builder_Compatibility::instance()->is_edit_mode()) {
120	return false;
121	}
122
123	return true;
124	}
125
126	/**
127	* Initialise the output buffer handler.
128	*
129	* @return void
130	*/
131	private function initialise() {
132	ob_start(array(self::$instance, 'optimize'));
133	}
134
135	/**
136	* Maybe initialise page optimizer.
137	*
138	* @return void
139	*/
140	public function maybe_initialise() {
141	if ($this->should_initialise()) {
142	$this->initialise();
143	}
144	}
145
146	/**
147	* Checks if the current execution context is WP-CLI.
148	*
149	* @return bool
150	*/
151	private function is_wp_cli() {
152	return defined('WP_CLI') && WP_CLI;
153	}
154
155	/**
156	* Checks if the current execution context is ajax request.
157	*
158	* @return boolean
159	*/
160	private function is_ajax() {
161	return defined('DOING_AJAX') && DOING_AJAX;
162	}
163
164	/**
165	* Checks if the current execution context is a cron job request.
166	*
167	* @return boolean
168	*/
169	private function is_cron_job() {
170	return defined('DOING_CRON') && DOING_CRON;
171	}
172
173	/**
174	* Checks if the current request is for a static asset.
175	*
176	* @return boolean
177	*/
178	private function is_static_asset_request() {
179	if (wpo_is_cacheable_sitemap_request()) return false;
180
181	// Skip non-HTML requests (like .css, .js, .map, .ico, images, fonts, .htaccess, etc.)
182	$path = isset($_SERVER['REQUEST_URI']) ? wp_parse_url(esc_url_raw(wp_unslash($_SERVER['REQUEST_URI'])), PHP_URL_PATH) : false;
183	if ($path) {
184	$ext = strtolower(pathinfo($path, PATHINFO_EXTENSION));
185	$skip_exts = array(
186	'css',
187	'js',
188	'json',
189	'map',
190	'ico',
191	'png',
192	'jpg',
193	'jpeg',
194	'gif',
195	'webp',
196	'svg',
197	'woff',
198	'woff2',
199	'ttf',
200	'otf',
201	'eot',
202	'xml',
203	'txt',
204	'pdf',
205	'zip',
206	'rar',
207	'htaccess',
208	);
209
210	if (in_array($ext, $skip_exts, true)) {
211	return true;
212	}
213	}
214	return false;
215	}
216
217	/**
218	* Returns a singleton instance of WPO_Page_Optimizer
219	*
220	* @return WPO_Page_Optimizer
221	*/
222	public static function instance() {
223	if (null === self::$instance) {
224	self::$instance = new self();
225	}
226	return self::$instance;
227	}
228
229	/**
230	* Add missing image dimensions if enabled
231	*
232	* @param string $buffer
233	*
234	* @return string
235	*/
236	private function maybe_add_missing_image_dimensions(string $buffer): string {
237	if (WP_Optimize::is_premium() && WP_Optimize()->get_options()->get_option('image_dimensions')) {
238	$buffer = WP_Optimize_Image_Dimensions::instance()->add_missing_image_dimensions($buffer);
239	}
240	return $buffer;
241	}
242
243	/**
244	* Delay JavaScript execution if enabled
245	*
246	* @param string $buffer
247	* @return string
248	*/
249	private function maybe_delay_js(string $buffer): string {
250	$delay_js = WP_Optimize_Delay_JS::instance();
251	if ($delay_js->should_process()) {
252	$buffer = $delay_js->process($buffer);
253	}
254	return $buffer;
255	}
256
257	/**
258	* Alter HTML for WebP if redirection is not possible
259	*
260	* @param string $buffer
261	*
262	* @return string
263	*/
264	private function maybe_alter_html_for_webp(string $buffer): string {
265	$webp = WP_Optimize_WebP::get_instance();
266	if ($webp->is_webp_conversion_enabled() && $webp->get_webp_conversion_test_result()) {
267	$buffer = $webp->maybe_decide_webp_serve_method($buffer);
268	}
269	return $buffer;
270	}
271
272	/**
273	* Includes file-based-page-cache-functions.php
274	*
275	* @return void
276	*/
277	private function include_page_cache_functions() {
278	require_once WPO_PLUGIN_MAIN_PATH . '/cache/file-based-page-cache-functions.php';
279	}
280	}
281
282	endif;
283