wp-optimize / cache / file-based-page-cache.php

file-based-page-cache.php in WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance 3.4.0, at cache/file-based-page-cache.php

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1	<?php
2
3	if (!defined('ABSPATH')) die('No direct access allowed');
4
5	/**
6	* File based page cache drop in
7	*/
8	require_once(dirname(__FILE__) . '/file-based-page-cache-functions.php');
9
10	if (!defined('WPO_CACHE_DIR')) define('WPO_CACHE_DIR', untrailingslashit(WP_CONTENT_DIR) . '/wpo-cache');
11
12	if (wpo_is_activity_stream_requested()) return;
13	if (wpo_is_robots_txt_requested()) return;
14
15	// Fix for compatibility issue with Jetpack's infinity scroll feature
16	if (isset($_GET['infinity']) && 'scrolling' === $_GET['infinity']) return;
17
18	/**
19	* Load extensions.
20	*/
21	wpo_cache_load_extensions();
22
23	/**
24	* Action triggered when the cache extensions are all loaded. Allows to execute code depending on an other extension, without knowing the order in which the files are loaded.
25	*/
26	if (function_exists('do_action')) {
27	do_action('wpo_cache_extensions_loaded');
28	}
29
30	$no_cache_because = array();
31
32	// check if we want to cache current page.
33	if (function_exists('add_filter') && function_exists('apply_filters')) {
34	add_filter('wpo_restricted_cache_page_type', 'wpo_restricted_cache_page_type');
35	add_filter('wpo_url_in_conditional_tags_exceptions', 'wpo_url_in_conditional_tags_exceptions');
36	$restricted_cache_page_type = apply_filters('wpo_restricted_cache_page_type', false);
37	$conditional_tag_exceptions = wpo_url_in_conditional_tags_exceptions();
38	} else {
39	// On old WP versions, you can't filter the result
40	$restricted_cache_page_type = wpo_restricted_cache_page_type(false);
41	$conditional_tag_exceptions = wpo_url_in_conditional_tags_exceptions();
42	}
43
44	if ($restricted_cache_page_type) {
45	$no_cache_because[] = $restricted_cache_page_type;
46	}
47
48	if ($conditional_tag_exceptions) {
49	$no_cache_because[] = $conditional_tag_exceptions;
50	}
51
52	// Don't cache non-GET requests.
53	if (!isset($_SERVER['REQUEST_METHOD']) \|\| 'GET' !== $_SERVER['REQUEST_METHOD']) {
54	$no_cache_because[] = 'The request method was not GET ('.(isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : '-').')';
55	}
56
57	$file_extension = $_SERVER['REQUEST_URI'];
58	$file_extension = preg_replace('#^(.?)\?.$#', '$1', $file_extension);
59	$file_extension = trim(preg_replace('#^.\.(.)$#', '$1', $file_extension));
60
61	// Don't cache disallowed extensions. Prevents wp-cron.php, xmlrpc.php, etc.
62	if (!preg_match('#index\.php$#i', $_SERVER['REQUEST_URI']) && preg_match('#sitemap([a-zA-Z0-9_-]+)?\.xml$#i', $_SERVER['REQUEST_URI']) && in_array($file_extension, array('php', 'xml', 'xsl'))) {
63	$no_cache_because[] = 'The request extension is not suitable for caching';
64	}
65
66	// Don't cache if logged in.
67	if (!empty($_COOKIE)) {
68	$wp_cookies = array('wordpressuser_', 'wordpresspass_', 'wordpress_sec_', 'wordpress_logged_in_');
69
70	if (!wpo_cache_loggedin_users()) {
71	foreach ($_COOKIE as $key => $value) {
72	foreach ($wp_cookies as $cookie) {
73	if (false !== strpos($key, $cookie)) {
74	$no_cache_because[] = 'WordPress login cookies were detected';
75	break(2);
76	}
77	}
78	}
79	}
80
81	if (!empty($_COOKIE['wpo_commented_post'])) {
82	$no_cache_because[] = 'The user has commented on a post (comment cookie set)';
83	}
84
85	// get cookie exceptions from options.
86	$cache_exception_cookies = !empty($GLOBALS['wpo_cache_config']['cache_exception_cookies']) ? $GLOBALS['wpo_cache_config']['cache_exception_cookies'] : array();
87	// filter cookie exceptions, since WP 4.6
88	$cache_exception_cookies = function_exists('apply_filters') ? apply_filters('wpo_cache_exception_cookies', $cache_exception_cookies) : $cache_exception_cookies;
89
90	// check if any cookie exists from exception list.
91	if (!empty($cache_exception_cookies)) {
92	foreach ($_COOKIE as $key => $value) {
93	foreach ($cache_exception_cookies as $cookie) {
94	if ('' != trim($cookie) && false !== strpos($key, $cookie)) {
95	$no_cache_because[] = 'An excepted cookie was set ('.$key.')';
96	break 2;
97	}
98	}
99	}
100	}
101	}
102
103	// check in not disabled current user agent
104	if (!empty($_SERVER['HTTP_USER_AGENT']) && false === wpo_is_accepted_user_agent($_SERVER['HTTP_USER_AGENT'])) {
105	$no_cache_because[] = "In the settings, caching is disabled for matches for this request's user agent";
106	}
107
108	// Deal with optional cache exceptions.
109	if (wpo_url_in_exceptions(wpo_current_url())) {
110	$no_cache_because[] = 'In the settings, caching is disabled for matches for the current URL';
111	}
112
113	if (!empty($_GET)) {
114	// get variables used for building filename.
115	$get_variable_names = wpo_cache_query_variables();
116
117	$get_variables = wpo_cache_maybe_ignore_query_variables(array_keys($_GET));
118
119	// if GET variables include one or more undefined variable names then we don't cache.
120	$get_variables_diff = array_diff($get_variables, $get_variable_names);
121	if (!empty($get_variables_diff)) {
122	$no_cache_because[] = "In the settings, caching is disabled for matches for one of the current request's GET parameters";
123	}
124	}
125
126	if (!empty($no_cache_because)) {
127	$no_cache_because_message = implode(', ', $no_cache_because);
128
129	// Add http header
130	if (!defined('DOING_CRON') \|\| !DOING_CRON) {
131	wpo_cache_add_nocache_http_header_with_send_headers_action($no_cache_because_message);
132	}
133
134	if ((!defined('DOING_CRON') \|\| !DOING_CRON)) {
135	$not_cached_details = "";
136
137	// Output the reason only when the user has turned on debugging
138	if (((defined('WP_DEBUG') && WP_DEBUG) \|\| isset($_GET['wpo_cache_debug']))) {
139	$not_cached_details = "because: ".htmlspecialchars($no_cache_because_message);
140	}
141	wpo_cache_add_footer_output(sprintf("Page not served from cache %s", $not_cached_details));
142	}
143	return;
144	}
145
146	wpo_serve_cache();
147
148	ob_start('wpo_cache');
149