← All changes | classes/autoptimizeCache.php +736 -151 2.3.3 → trunk View file →

		@@ -1,193 +1,574 @@
1	1	<?php
2		-if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly
	2	+/**
	3	+ * Handles disk-cache-related operations.
	4	+ */
3	5
4		-class autoptimizeCache {
	6	+if ( ! defined( 'ABSPATH' ) ) {
	7	+ exit;
	8	+}
	9	+
	10	+class autoptimizeCache
	11	+{
	12	+ /**
	13	+ * Cache filename.
	14	+ *
	15	+ * @var string
	16	+ */
5	17	private $filename;
6		- private $mime;
	18	+
	19	+ /**
	20	+ * Cache directory path (with a trailing slash).
	21	+ *
	22	+ * @var string
	23	+ */
7	24	private $cachedir;
8		- private $delayed;
9		-
10		- public function __construct($md5,$ext='php') {
	25	+
	26	+ /**
	27	+ * Whether gzipping is done by the web server or us.
	28	+ * True => we don't gzip, the web server does it.
	29	+ * False => we do it ourselves.
	30	+ *
	31	+ * @var bool
	32	+ */
	33	+ private $nogzip;
	34	+
	35	+ /**
	36	+ * Ctor.
	37	+ *
	38	+ * @param string $md5 Hash.
	39	+ * @param string $ext Extension.
	40	+ */
	41	+ public function __construct( $md5, $ext = 'php' )
	42	+ {
	43	+ $_min_ext = '';
	44	+ if ( apply_filters( 'autoptimize_filter_cache_url_add_min_ext', false ) ) {
	45	+ $_min_ext = '.min';
	46	+ }
	47	+
11	48	$this->cachedir = AUTOPTIMIZE_CACHE_DIR;
12		- $this->delayed = AUTOPTIMIZE_CACHE_DELAY;
13		- $this->nogzip = AUTOPTIMIZE_CACHE_NOGZIP;
14		- if($this->nogzip == false) {
15		- $this->filename = AUTOPTIMIZE_CACHEFILE_PREFIX.$md5.'.php';
	49	+ $this->nogzip = AUTOPTIMIZE_CACHE_NOGZIP;
	50	+ if ( ! $this->nogzip ) {
	51	+ $this->filename = AUTOPTIMIZE_CACHEFILE_PREFIX . $md5 . $_min_ext . '.php';
16	52	} else {
17		- if (in_array($ext, array("js","css"))) {
18		- $this->filename = $ext.'/'.AUTOPTIMIZE_CACHEFILE_PREFIX.$md5.'.'.$ext;
	53	+ if ( in_array( $ext, array( 'js', 'css' ) ) ) {
	54	+ $this->filename = $ext . '/' . AUTOPTIMIZE_CACHEFILE_PREFIX . $md5 . $_min_ext . '.' . $ext;
19	55	} else {
20		- $this->filename = AUTOPTIMIZE_CACHEFILE_PREFIX.$md5.'.'.$ext;
	56	+ $this->filename = AUTOPTIMIZE_CACHEFILE_PREFIX . $md5 . $_min_ext . '.' . $ext;
21	57	}
22	58	}
23	59	}
24		-
25		- public function check() {
26		- if(!file_exists($this->cachedir.$this->filename)) {
27		- // No cached file, sorry
28		- return false;
29		- }
30		- // Cache exists!
31		- return true;
	60	+
	61	+ /**
	62	+ * Returns true if the cached file exists on disk.
	63	+ *
	64	+ * @return bool
	65	+ */
	66	+ public function check()
	67	+ {
	68	+ return file_exists( $this->cachedir . $this->filename );
32	69	}
33		-
34		- public function retrieve() {
35		- if($this->check()) {
36		- if($this->nogzip == false) {
37		- return file_get_contents($this->cachedir.$this->filename.'.none');
	70	+
	71	+ /**
	72	+ * Returns cache contents if they exist, false otherwise.
	73	+ *
	74	+ * @return string|false
	75	+ */
	76	+ public function retrieve()
	77	+ {
	78	+ if ( $this->check() ) {
	79	+ if ( false == $this->nogzip ) {
	80	+ return file_get_contents( $this->cachedir . $this->filename . '.none' );
38	81	} else {
39		- return file_get_contents($this->cachedir.$this->filename);
	82	+ return file_get_contents( $this->cachedir . $this->filename );
40	83	}
41	84	}
42	85	return false;
43	86	}
44		-
45		- public function cache($code,$mime) {
46		- if($this->nogzip == false) {
47		- $file = ($this->delayed ? 'delayed.php' : 'default.php');
48		- $phpcode = file_get_contents(AUTOPTIMIZE_PLUGIN_DIR.'/config/'.$file);
49		- $phpcode = str_replace(array('%%CONTENT%%','exit;'),array($mime,''),$phpcode);
50		- file_put_contents($this->cachedir.$this->filename,$phpcode, LOCK_EX);
51		- file_put_contents($this->cachedir.$this->filename.'.none',$code, LOCK_EX);
52		- if(!$this->delayed) {
53		- // Compress now!
54		- file_put_contents($this->cachedir.$this->filename.'.deflate',gzencode($code,9,FORCE_DEFLATE), LOCK_EX);
55		- file_put_contents($this->cachedir.$this->filename.'.gzip',gzencode($code,9,FORCE_GZIP), LOCK_EX);
	87	+
	88	+ /**
	89	+ * Stores given $data in cache.
	90	+ *
	91	+ * @param string $data Data to cache.
	92	+ * @param string $mime Mimetype.
	93	+ *
	94	+ * @return void|bool
	95	+ */
	96	+ public function cache( $data, $mime )
	97	+ {
	98	+ // readonly FS explicitly OK'ed by developer, so just pretend all is OK.
	99	+ if ( defined( 'AUTOPTIMIZE_CACHE_READONLY' ) ) {
	100	+ return true;
	101	+ }
	102	+
	103	+ // off by default; check if cachedirs exist every time before caching
	104	+ //
	105	+ // to be activated for users that experience these ugly errors;
	106	+ // PHP Warning: file_put_contents failed to open stream: No such file or directory.
	107	+ if ( apply_filters( 'autoptimize_filter_cache_checkdirs_on_write', false ) ) {
	108	+ $this->check_and_create_dirs();
	109	+ }
	110	+
	111	+ if ( false === $this->nogzip ) {
	112	+ // We handle gzipping ourselves.
	113	+ $file = 'default.php';
	114	+ $phpcode = file_get_contents( AUTOPTIMIZE_PLUGIN_DIR . 'config/' . $file );
	115	+ $phpcode = str_replace( array( '%%CONTENT%%', 'exit;' ), array( $mime, '' ), $phpcode );
	116	+
	117	+ file_put_contents( $this->cachedir . $this->filename, $phpcode );
	118	+ file_put_contents( $this->cachedir . $this->filename . '.none', $data );
	119	+ } else {
	120	+ // Write code to cache without doing anything else.
	121	+ file_put_contents( $this->cachedir . $this->filename, $data );
	122	+
	123	+ // save fallback .js or .css file if filter true (to be false by default) but not if snippet or single.
	124	+ if ( self::do_fallback() && strpos( $this->filename, '_snippet_' ) === false && strpos( $this->filename, '_single_' ) === false ) {
	125	+ $_extension = pathinfo( $this->filename, PATHINFO_EXTENSION );
	126	+ $_fallback_file = AUTOPTIMIZE_CACHEFILE_PREFIX . 'fallback.' . $_extension;
	127	+ if ( ( 'css' === $_extension || 'js' === $_extension ) && ! file_exists( $this->cachedir . $_extension . '/' . $_fallback_file ) ) {
	128	+ file_put_contents( $this->cachedir . $_extension . '/' . $_fallback_file, $data );
	129	+ }
56	130	}
57		- } else {
58		- // Write code to cache without doing anything else
59		- file_put_contents($this->cachedir.$this->filename,$code, LOCK_EX);
60		- if (apply_filters('autoptimize_filter_cache_create_static_gzip', false)) {
61		- // Create an additional cached gzip file
62		- file_put_contents($this->cachedir.$this->filename.'.gz', gzencode($code,9,FORCE_GZIP), LOCK_EX);
	131	+
	132	+ if ( apply_filters( 'autoptimize_filter_cache_create_static_gzip', false ) ) {
	133	+ // Create an additional cached gzip file.
	134	+ file_put_contents( $this->cachedir . $this->filename . '.gz', gzencode( $data, 9, FORCE_GZIP ) );
	135	+ // If PHP Brotli extension is installed, create an additional cached Brotli file.
	136	+ if ( function_exists( 'brotli_compress' ) ) {
	137	+ file_put_contents( $this->cachedir . $this->filename . '.br', brotli_compress( $data, 11, BROTLI_GENERIC ) );
	138	+ }
63	139	}
64	140	}
	141	+
	142	+ // Provide 3rd party action hook for every cache file that is created.
	143	+ // This hook can for example be used to inject a copy of the created cache file to a other domain.
	144	+ do_action( 'autoptimize_action_cache_file_created', $this->cachedir . $this->filename );
65	145	}
66		-
67		- public function getname() {
68		- apply_filters('autoptimize_filter_cache_getname',AUTOPTIMIZE_CACHE_URL.$this->filename);
	146	+
	147	+ /**
	148	+ * Get cache filename.
	149	+ *
	150	+ * @return string
	151	+ */
	152	+ public function getname()
	153	+ {
	154	+ // NOTE: This could've maybe been a do_action() instead, however,
	155	+ // that ship has sailed.
	156	+ // The original idea here was to provide 3rd party code a hook so that
	157	+ // it can "listen" to all the complete autoptimized-urls that the page
	158	+ // will emit... Or something to that effect I think?
	159	+ apply_filters( 'autoptimize_filter_cache_getname', AUTOPTIMIZE_CACHE_URL . $this->filename );
	160	+
69	161	return $this->filename;
70	162	}
71		-
72		- static function clearall() {
73		- if(!autoptimizeCache::cacheavail()) {
	163	+
	164	+ /**
	165	+ * Returns true if given `$file` is considered a valid Autoptimize cache file,
	166	+ * false otherwise.
	167	+ *
	168	+ * @param string $dir Directory name (with a trailing slash).
	169	+ * @param string $file Filename.
	170	+ * @return bool
	171	+ */
	172	+ protected static function is_valid_cache_file( $dir, $file )
	173	+ {
	174	+ if ( '.' !== $file && '..' !== $file &&
	175	+ false !== strpos( $file, AUTOPTIMIZE_CACHEFILE_PREFIX ) &&
	176	+ is_file( $dir . $file ) ) {
	177	+
	178	+ // It's a valid file!
	179	+ return true;
	180	+ }
	181	+
	182	+ // Everything else is considered invalid!
	183	+ return false;
	184	+ }
	185	+
	186	+ /**
	187	+ * Clears contents of AUTOPTIMIZE_CACHE_DIR.
	188	+ *
	189	+ * @return void
	190	+ */
	191	+ protected static function clear_cache_classic()
	192	+ {
	193	+ $contents = self::get_cache_contents();
	194	+ foreach ( $contents as $name => $files ) {
	195	+ $dir = rtrim( AUTOPTIMIZE_CACHE_DIR . $name, '/' ) . '/';
	196	+ foreach ( $files as $file ) {
	197	+ if ( self::is_valid_cache_file( $dir, $file ) ) {
	198	+ @unlink( $dir . $file ); // @codingStandardsIgnoreLine
	199	+ }
	200	+ }
	201	+ }
	202	+
	203	+ @unlink( AUTOPTIMIZE_CACHE_DIR . '/.htaccess' ); // @codingStandardsIgnoreLine
	204	+ }
	205	+
	206	+ /**
	207	+ * Recursively deletes the specified pathname (file/directory) if possible.
	208	+ * Returns true on success, false otherwise.
	209	+ *
	210	+ * @param string $pathname Pathname to remove.
	211	+ *
	212	+ * @return bool
	213	+ */
	214	+ protected static function rmdir( $pathname )
	215	+ {
	216	+ $files = self::get_dir_contents( $pathname );
	217	+ foreach ( $files as $file ) {
	218	+ $path = $pathname . '/' . $file;
	219	+ if ( is_dir( $path ) ) {
	220	+ self::rmdir( $path );
	221	+ } else {
	222	+ unlink( $path );
	223	+ }
	224	+ }
	225	+
	226	+ return rmdir( $pathname );
	227	+ }
	228	+
	229	+ /**
	230	+ * Clears contents of AUTOPTIMIZE_CACHE_DIR by renaming the current
	231	+ * cache directory into a new one with a unique name and then
	232	+ * re-creating the default (empty) cache directory.
	233	+ *
	234	+ * Important/ Fixme: this does not take multisite into account, so
	235	+ * if advanced_cache_clear_enabled is true (it is not by default)
	236	+ * then the content for all subsites is zapped!
	237	+ *
	238	+ * @return bool Returns true when everything is done successfully, false otherwise.
	239	+ */
	240	+ protected static function clear_cache_via_rename()
	241	+ {
	242	+ $ok = false;
	243	+ $dir = self::get_pathname_base();
	244	+ $new_name = self::get_unique_name();
	245	+
	246	+ // Makes sure the new pathname is on the same level...
	247	+ $new_pathname = dirname( $dir ) . '/' . $new_name;
	248	+ $renamed = @rename( $dir, $new_pathname ); // @codingStandardsIgnoreLine
	249	+
	250	+ // When renamed, re-create the default cache directory back so it's
	251	+ // available again...
	252	+ if ( $renamed ) {
	253	+ $ok = self::cacheavail();
	254	+ }
	255	+
	256	+ return $ok;
	257	+ }
	258	+
	259	+ /**
	260	+ * Returns true when advanced cache clearing is enabled.
	261	+ *
	262	+ * @return bool
	263	+ */
	264	+ public static function advanced_cache_clear_enabled()
	265	+ {
	266	+ return apply_filters( 'autoptimize_filter_cache_clear_advanced', false );
	267	+ }
	268	+
	269	+ /**
	270	+ * Returns a (hopefully) unique new cache folder name for renaming purposes.
	271	+ *
	272	+ * @return string
	273	+ */
	274	+ protected static function get_unique_name()
	275	+ {
	276	+ $prefix = self::get_advanced_cache_clear_prefix();
	277	+ $new_name = uniqid( $prefix, true );
	278	+
	279	+ return $new_name;
	280	+ }
	281	+
	282	+ /**
	283	+ * Get cache prefix name used in advanced cache clearing mode.
	284	+ *
	285	+ * @return string
	286	+ */
	287	+ protected static function get_advanced_cache_clear_prefix()
	288	+ {
	289	+ $pathname = self::get_pathname_base();
	290	+ $basename = basename( $pathname );
	291	+ $prefix = $basename . '-artifact-';
	292	+
	293	+ return $prefix;
	294	+ }
	295	+
	296	+ /**
	297	+ * Returns an array of file and directory names found within
	298	+ * the given $pathname without '.' and '..' elements.
	299	+ *
	300	+ * @param string $pathname Pathname.
	301	+ *
	302	+ * @return array
	303	+ */
	304	+ protected static function get_dir_contents( $pathname )
	305	+ {
	306	+ return array_slice( scandir( $pathname ), 2 );
	307	+ }
	308	+
	309	+ /**
	310	+ * Wipes directories which were created as part of the fast cache clearing
	311	+ * routine (which renames the current cache directory into a new one with
	312	+ * a custom-prefixed unique name).
	313	+ *
	314	+ * @return bool
	315	+ */
	316	+ public static function delete_advanced_cache_clear_artifacts()
	317	+ {
	318	+ // Don't go through these motions (called from the cachechecker) if advanced cache clear isn't even active.
	319	+ if ( ! self::advanced_cache_clear_enabled() ) {
74	320	return false;
75	321	}
76		-
77		- // scan the cachedirs
78		- foreach (array("","js","css") as $scandirName) {
79		- $scan[$scandirName] = scandir(AUTOPTIMIZE_CACHE_DIR.$scandirName);
	322	+
	323	+ $dir = self::get_pathname_base();
	324	+ $prefix = self::get_advanced_cache_clear_prefix();
	325	+ $parent = dirname( $dir );
	326	+ $ok = false;
	327	+
	328	+ // Returns the list of files without '.' and '..' elements.
	329	+ $files = self::get_dir_contents( $parent );
	330	+ if ( is_array( $files ) && ! empty( $files ) ) {
	331	+ foreach ( $files as $file ) {
	332	+ $path = $parent . '/' . $file;
	333	+ $prefixed = ( false !== strpos( $path, $prefix ) );
	334	+ // Removing only our own (prefixed) directories...
	335	+ if ( is_dir( $path ) && $prefixed ) {
	336	+ $ok = self::rmdir( $path );
	337	+ }
	338	+ }
80	339	}
81		-
82		- // clear the cachedirs
83		- foreach ($scan as $scandirName=>$scanneddir) {
84		- $thisAoCacheDir=rtrim(AUTOPTIMIZE_CACHE_DIR.$scandirName,"/")."/";
85		- foreach($scanneddir as $file) {
86		- if(!in_array($file,array('.','..')) && strpos($file,AUTOPTIMIZE_CACHEFILE_PREFIX) !== false && is_file($thisAoCacheDir.$file)) {
87		- @unlink($thisAoCacheDir.$file);
	340	+
	341	+ return $ok;
	342	+ }
	343	+
	344	+ /**
	345	+ * Returns the cache directory pathname used.
	346	+ * Done as a function so we canSlightly different
	347	+ * if multisite is used and `autoptimize_separate_blog_caches` filter
	348	+ * is used.
	349	+ *
	350	+ * @return string
	351	+ */
	352	+ public static function get_pathname()
	353	+ {
	354	+ $pathname = self::get_pathname_base();
	355	+
	356	+ if ( is_multisite() && apply_filters( 'autoptimize_separate_blog_caches', true ) ) {
	357	+ $blog_id = get_current_blog_id();
	358	+ $pathname .= $blog_id . '/';
	359	+ }
	360	+
	361	+ return $pathname;
	362	+ }
	363	+
	364	+ /**
	365	+ * Returns the base path of our cache directory.
	366	+ *
	367	+ * @return string
	368	+ */
	369	+ protected static function get_pathname_base()
	370	+ {
	371	+ $pathname = WP_CONTENT_DIR . AUTOPTIMIZE_CACHE_CHILD_DIR;
	372	+
	373	+ return $pathname;
	374	+ }
	375	+
	376	+ /**
	377	+ * Deletes everything from the cache directories.
	378	+ *
	379	+ * @param bool $propagate Whether to trigger additional actions when cache is purged.
	380	+ *
	381	+ * @return bool
	382	+ */
	383	+ public static function clearall( $propagate = true )
	384	+ {
	385	+ if ( defined( 'ET_CORE_VERSION' ) && 'Divi' === get_template() ) {
	386	+ // see https://blog.futtta.be/2018/11/17/warning-divi-purging-autoptimizes-cache/ .
	387	+ $dbt = debug_backtrace( DEBUG_BACKTRACE_IGNORE_ARGS, 2 );
	388	+ $caller = isset( $dbt[1]['function'] ) ? $dbt[1]['function'] : null;
	389	+ if ( 'et_core_clear_wp_cache' === $caller ) {
	390	+ if ( apply_filters( 'autoptimize_filter_cache_divi_wrong_complain', true ) ) {
	391	+ _doing_it_wrong( 'autoptimizeCache::clearall', 'Divi devs: please don\'t clear Autoptimize\'s cache, it is unneeded and can break sites. You can contact me at [email protected] to discuss.', 'Autoptimize 2.9.6' );
88	392	}
	393	+ return false;
89	394	}
90	395	}
91	396
92		- @unlink(AUTOPTIMIZE_CACHE_DIR."/.htaccess");
93		- delete_transient("autoptimize_stats");
	397	+ if ( ! self::cacheavail() || true === apply_filters( 'autoptimize_filter_cache_clearall_disabled', false ) ) {
	398	+ return false;
	399	+ }
94	400
95		- // add cachepurged action
96		- if (!function_exists('autoptimize_do_cachepurged_action')) {
97		- function autoptimize_do_cachepurged_action() {
98		- do_action("autoptimize_action_cachepurged");
	401	+ // TODO/FIXME: If cache is big, switch to advanced/new cache clearing automatically?
	402	+ if ( self::advanced_cache_clear_enabled() ) {
	403	+ self::clear_cache_via_rename();
	404	+ } else {
	405	+ self::clear_cache_classic();
	406	+ }
	407	+
	408	+ // Remove 404 handler if required.
	409	+ if ( self::do_fallback() ) {
	410	+ $_fallback_php = trailingslashit( WP_CONTENT_DIR ) . 'autoptimize_404_handler.php';
	411	+ @unlink( $_fallback_php ); // @codingStandardsIgnoreLine
	412	+ }
	413	+
	414	+ // Remove the transient so it gets regenerated...
	415	+ delete_transient( 'autoptimize_stats' );
	416	+
	417	+ // Cache was just purged, clear page cache and allow others to hook into our purging...
	418	+ if ( true === $propagate ) {
	419	+ if ( ! function_exists( 'autoptimize_do_cachepurged_action' ) ) {
	420	+ function autoptimize_do_cachepurged_action() {
	421	+ do_action( 'autoptimize_action_cachepurged' );
	422	+ }
99	423	}
	424	+ add_action( 'shutdown', 'autoptimize_do_cachepurged_action', 11 );
	425	+ add_action( 'autoptimize_action_cachepurged', array( 'autoptimizeCache', 'flushPageCache' ), 10, 0 );
100	426	}
101		- add_action("shutdown","autoptimize_do_cachepurged_action",11);
102		-
103		- // try to purge caching plugins cache-files?
104		- include_once(AUTOPTIMIZE_PLUGIN_DIR.'classlesses/autoptimizePageCacheFlush.php');
105		- add_action("autoptimize_action_cachepurged","autoptimize_flush_pagecache",10,0);
106	427
107		- // warm cache (part of speedupper)?
108		- if ( apply_filters('autoptimize_filter_speedupper', true) ) {
109		- $warmCacheUrl = site_url()."/?ao_speedup_cachebuster=".rand(1,100000);
110		- $warmCache = @wp_remote_get($warmCacheUrl);
111		- unset($warmCache);
	428	+ // Warm cache (part of speedupper)!
	429	+ if ( apply_filters( 'autoptimize_filter_speedupper', true ) && false == get_transient( 'autoptimize_cache_warmer_protector' ) ) {
	430	+ set_transient( 'autoptimize_cache_warmer_protector', 'I shall not warm cache for another 10 minutes.', 60 * 10 );
	431	+ $url = site_url() . '/?ao_speedup_cachebuster=' . rand( 1, 100000 );
	432	+ $url = apply_filters( 'autoptimize_filter_cache_warmer_url', $url );
	433	+ $cache = @wp_remote_get( $url ); // @codingStandardsIgnoreLine
	434	+ unset( $cache );
112	435	}
113	436
114	437	return true;
115	438	}
116	439
117		- static function stats() {
118		- $AOstats=get_transient("autoptimize_stats");
	440	+ /**
	441	+ * Wrapper for clearall but with false param
	442	+ * to ensure the event is not propagated to others
	443	+ * through our own hooks (to avoid infinite loops).
	444	+ *
	445	+ * @return bool
	446	+ */
	447	+ public static function clearall_actionless()
	448	+ {
	449	+ return self::clearall( false );
	450	+ }
119	451
120		- if (empty($AOstats)) {
121		- // Cache not available :(
122		- if(!autoptimizeCache::cacheavail()) {
	452	+ /**
	453	+ * Returns the contents of our cache dirs.
	454	+ *
	455	+ * @return array
	456	+ */
	457	+ protected static function get_cache_contents()
	458	+ {
	459	+ $contents = array();
	460	+
	461	+ foreach ( array( '', 'js', 'css' ) as $dir ) {
	462	+ $contents[ $dir ] = scandir( AUTOPTIMIZE_CACHE_DIR . $dir );
	463	+ }
	464	+
	465	+ return $contents;
	466	+ }
	467	+
	468	+ /**
	469	+ * Returns stats about cached contents.
	470	+ *
	471	+ * @return array
	472	+ */
	473	+ public static function stats()
	474	+ {
	475	+ $stats = get_transient( 'autoptimize_stats' );
	476	+
	477	+ // If no transient, do the actual scan!
	478	+ if ( ! is_array( $stats ) ) {
	479	+ if ( ! self::cacheavail() ) {
123	480	return 0;
124	481	}
125		-
126		- // Count cached info
127		- $count = 0;
128		- $size = 0;
129		-
130		- // scan the cachedirs
131		- foreach (array("","js","css") as $scandirName) {
132		- $scan[$scandirName] = scandir(AUTOPTIMIZE_CACHE_DIR.$scandirName);
	482	+ $stats = self::stats_scan();
	483	+ $count = $stats[0];
	484	+ if ( $count > 100 ) {
	485	+ // Store results in transient.
	486	+ set_transient(
	487	+ 'autoptimize_stats',
	488	+ $stats,
	489	+ apply_filters( 'autoptimize_filter_cache_statsexpiry', HOUR_IN_SECONDS )
	490	+ );
133	491	}
134		-
135		- foreach ($scan as $scandirName=>$scanneddir) {
136		- $thisAoCacheDir=rtrim(AUTOPTIMIZE_CACHE_DIR.$scandirName,"/")."/";
137		- foreach($scanneddir as $file) {
138		- if(!in_array($file,array('.','..')) && strpos($file,AUTOPTIMIZE_CACHEFILE_PREFIX) !== false) {
139		- if(is_file($thisAoCacheDir.$file)) {
140		- if(AUTOPTIMIZE_CACHE_NOGZIP && (strpos($file,'.js') !== false || strpos($file,'.css') !== false || strpos($file,'.img') !== false || strpos($file,'.txt') !== false )) {
141		- $count++;
142		- } elseif(!AUTOPTIMIZE_CACHE_NOGZIP && strpos($file,'.none') !== false) {
143		- $count++;
144		- }
145		- $size+=filesize($thisAoCacheDir.$file);
146		- }
	492	+ }
	493	+
	494	+ return $stats;
	495	+ }
	496	+
	497	+ /**
	498	+ * Performs a scan of cache directory contents and returns an array
	499	+ * with 3 values: count, size, timestamp.
	500	+ * count = total number of found files
	501	+ * size = total filesize (in bytes) of found files
	502	+ * timestamp = unix timestamp when the scan was last performed/finished.
	503	+ *
	504	+ * @return array
	505	+ */
	506	+ protected static function stats_scan()
	507	+ {
	508	+ $count = 0;
	509	+ $size = 0;
	510	+
	511	+ // Scan everything in our cache directories.
	512	+ foreach ( self::get_cache_contents() as $name => $files ) {
	513	+ $dir = rtrim( AUTOPTIMIZE_CACHE_DIR . $name, '/' ) . '/';
	514	+ foreach ( $files as $file ) {
	515	+ if ( self::is_valid_cache_file( $dir, $file ) ) {
	516	+ if ( AUTOPTIMIZE_CACHE_NOGZIP &&
	517	+ (
	518	+ false !== strpos( $file, '.js' ) ||
	519	+ false !== strpos( $file, '.css' ) ||
	520	+ false !== strpos( $file, '.img' ) ||
	521	+ false !== strpos( $file, '.txt' )
	522	+ )
	523	+ ) {
	524	+ // Web server is gzipping, we count .js|.css|.img|.txt files.
	525	+ $count++;
	526	+ } elseif ( ! AUTOPTIMIZE_CACHE_NOGZIP && false !== strpos( $file, '.none' ) ) {
	527	+ // We are gzipping ourselves via php, counting only .none files.
	528	+ $count++;
147	529	}
	530	+ $size += filesize( $dir . $file );
148	531	}
149	532	}
150		- $AOstats=array($count,$size,time());
151		- if ($count>100) {
152		- set_transient( "autoptimize_stats", $AOstats, apply_filters( 'autoptimize_filter_cache_statsexpiry', HOUR_IN_SECONDS ) );
153		- }
154	533	}
155		- // print the number of instances
156		- return $AOstats;
157		- }
158	534
159		- static function cacheavail() {
160		- if(!defined('AUTOPTIMIZE_CACHE_DIR')) {
161		- // We didn't set a cache
	535	+ $stats = array( $count, $size, time() );
	536	+
	537	+ return $stats;
	538	+ }
	539	+
	540	+ /**
	541	+ * Ensures the cache directory exists, is writeable and contains the
	542	+ * required .htaccess files.
	543	+ * Returns false in case it fails to ensure any of those things.
	544	+ *
	545	+ * @return bool
	546	+ */
	547	+ public static function cacheavail()
	548	+ {
	549	+ // readonly FS explicitly OK'ed by dev, let's assume the cache dirs are there!
	550	+ if ( defined( 'AUTOPTIMIZE_CACHE_READONLY' ) ) {
	551	+ return true;
	552	+ }
	553	+
	554	+ if ( false === autoptimizeCache::check_and_create_dirs() ) {
162	555	return false;
163	556	}
164		-
165		- foreach (array("","js","css") as $checkDir) {
166		- if(!autoptimizeCache::checkCacheDir(AUTOPTIMIZE_CACHE_DIR.$checkDir)) {
167		- return false;
168		- }
169		- }
170		-
171		- /** write index.html here to avoid prying eyes */
172		- $indexFile=AUTOPTIMIZE_CACHE_DIR.'/index.html';
173		- if(!is_file($indexFile)) {
174		- @file_put_contents($indexFile,'<html><head><meta name="robots" content="noindex, nofollow"></head><body>Generated by <a href="http://wordpress.org/extend/plugins/autoptimize/" rel="nofollow">Autoptimize</a></body></html>');
175		- }
176	557
177		- /** write .htaccess here to overrule wp_super_cache */
178		- $htAccess=AUTOPTIMIZE_CACHE_DIR.'/.htaccess';
179		- if(!is_file($htAccess)) {
180		- /**
181		- * create wp-content/AO_htaccess_tmpl with
	558	+ // Using .htaccess inside our cache folder to overrule wp-super-cache.
	559	+ $htaccess = AUTOPTIMIZE_CACHE_DIR . '/.htaccess';
	560	+ if ( ! is_file( $htaccess ) ) {
	561	+ /**
	562	+ * Create `wp-content/AO_htaccess_tmpl` file with
182	563	* whatever htaccess rules you might need
183	564	* if you want to override default AO htaccess
184	565	*/
185		- $htaccess_tmpl=WP_CONTENT_DIR."/AO_htaccess_tmpl";
186		- if (is_file($htaccess_tmpl)) {
187		- $htAccessContent=file_get_contents($htaccess_tmpl);
188		- } else if (is_multisite() || AUTOPTIMIZE_CACHE_NOGZIP == false) {
189		- $htAccessContent='<IfModule mod_expires.c>
	566	+ $htaccess_tmpl = WP_CONTENT_DIR . '/AO_htaccess_tmpl';
	567	+ if ( is_file( $htaccess_tmpl ) ) {
	568	+ $content = file_get_contents( $htaccess_tmpl );
	569	+ } elseif ( is_multisite() || ! AUTOPTIMIZE_CACHE_NOGZIP ) {
	570	+ $content = '<IfModule mod_expires.c>
190	571	ExpiresActive On
191	572	ExpiresByType text/css A30672000
192	573	ExpiresByType text/javascript A30672000
193	574	ExpiresByType application/javascript A30672000
		@@ -211,9 +592,9 @@
211	592	Allow from all
212	593	</Files>
213	594	</IfModule>';
214	595	} else {
215		- $htAccessContent='<IfModule mod_expires.c>
	596	+ $content = '<IfModule mod_expires.c>
216	597	ExpiresActive On
217	598	ExpiresByType text/css A30672000
218	599	ExpiresByType text/javascript A30672000
219	600	ExpiresByType application/javascript A30672000
		@@ -237,34 +618,238 @@
237	618	Deny from all
238	619	</Files>
239	620	</IfModule>';
240	621	}
241		- @file_put_contents($htAccess,$htAccessContent);
	622	+
	623	+ if ( self::do_fallback() === true ) {
	624	+ $content .= "\nErrorDocument 404 " . trailingslashit( parse_url( content_url(), PHP_URL_PATH ) ) . 'autoptimize_404_handler.php';
	625	+ }
	626	+ @file_put_contents( $htaccess, $content ); // @codingStandardsIgnoreLine
242	627	}
243	628
244		- // All OK
	629	+ if ( self::do_fallback() ) {
	630	+ self::check_fallback_php();
	631	+ }
	632	+
	633	+ // All OK!
245	634	return true;
246	635	}
247	636
248		- static function checkCacheDir($dir) {
249		- // Check and create if not exists
250		- if(!file_exists($dir)) {
251		- @mkdir($dir,0775,true);
252		- if(!file_exists($dir)) {
	637	+ /**
	638	+ * Checks if fallback-php file exists and create it if not.
	639	+ *
	640	+ * Return bool
	641	+ */
	642	+ public static function check_fallback_php() {
	643	+ $_fallback_filename = 'autoptimize_404_handler.php';
	644	+ $_fallback_php = trailingslashit( WP_CONTENT_DIR ) . $_fallback_filename;
	645	+ $_fallback_status = true;
	646	+
	647	+ if ( ! file_exists( $_fallback_php ) && is_writable( WP_CONTENT_DIR ) ) {
	648	+ $_fallback_php_contents = file_get_contents( AUTOPTIMIZE_PLUGIN_DIR . 'config/' . $_fallback_filename );
	649	+ $_fallback_php_contents = str_replace( '<?php exit;', '<?php', $_fallback_php_contents );
	650	+ $_fallback_php_contents = str_replace( '<!--ao-cache-dir-->', AUTOPTIMIZE_CACHE_DIR, $_fallback_php_contents );
	651	+ $_fallback_php_contents = str_replace( '<!--ao-cachefile-prefix-->', AUTOPTIMIZE_CACHEFILE_PREFIX, $_fallback_php_contents );
	652	+ if ( is_multisite() ) {
	653	+ $_fallback_php_contents = str_replace( '$multisite = false;', '$multisite = true;', $_fallback_php_contents );
	654	+ }
	655	+ if ( apply_filters( 'autoptimize_filter_cache_fallback_log_errors', false ) ) {
	656	+ $_fallback_php_contents = str_replace( '// error_log', 'error_log', $_fallback_php_contents );
	657	+ }
	658	+ $_fallback_status = file_put_contents( $_fallback_php, $_fallback_php_contents );
	659	+ }
	660	+
	661	+ return $_fallback_status;
	662	+ }
	663	+
	664	+ /**
	665	+ * Tells if AO should try to avoid 404's by creating fallback filesize
	666	+ * and create a php 404 handler and tell .htaccess to redirect to said handler
	667	+ * and hook into WordPress to redirect 404 to said handler as well. NGINX users
	668	+ * are smart enough to get this working, no? ;-)
	669	+ *
	670	+ * Return bool
	671	+ */
	672	+ public static function do_fallback() {
	673	+ static $_do_fallback = null;
	674	+
	675	+ if ( null === $_do_fallback ) {
	676	+ $_do_fallback = (bool) apply_filters( 'autoptimize_filter_cache_do_fallback', autoptimizeOptionWrapper::get_option( 'autoptimize_cache_fallback', '1' ) );
	677	+ }
	678	+
	679	+ return $_do_fallback;
	680	+ }
	681	+
	682	+ /**
	683	+ * Hooks into template_redirect, will act on 404-ing requests for
	684	+ * Autoptimized files and redirects to the fallback CSS/ JS if available
	685	+ * and 410'ing ("Gone") if fallback not available.
	686	+ */
	687	+ public static function wordpress_notfound_fallback() {
	688	+ $original_request = strtok( $_SERVER['REQUEST_URI'], '?' );
	689	+ if ( strpos( $original_request, wp_basename( WP_CONTENT_DIR ) . AUTOPTIMIZE_CACHE_CHILD_DIR ) !== false && is_404() ) {
	690	+ // make sure this is not considered a 404.
	691	+ global $wp_query;
	692	+ $wp_query->is_404 = false;
	693	+
	694	+ // set fallback path.
	695	+ $js_or_css = pathinfo( $original_request, PATHINFO_EXTENSION );
	696	+ $fallback_path = AUTOPTIMIZE_CACHE_DIR . $js_or_css . '/autoptimize_fallback.' . $js_or_css;
	697	+
	698	+ // prepare for Shakeeb's Unused CSS files to be 404-handled as well.
	699	+ if ( strpos( $original_request, 'uucss/uucss-' ) !== false ) {
	700	+ $original_request = preg_replace( '/uucss\/uucss-[a-z0-9]{32}-/', 'css/', $original_request );
	701	+ }
	702	+
	703	+ // set fallback URL.
	704	+ $fallback_target = preg_replace( '/(.*)_(?:[a-z0-9]{32})\.(js|css)$/', '${1}_fallback.${2}', $original_request );
	705	+
	706	+ // redirect to fallback if possible.
	707	+ if ( $original_request !== $fallback_target && file_exists( $fallback_path ) ) {
	708	+ // redirect to fallback.
	709	+ wp_redirect( $fallback_target, 302 );
	710	+ } else {
	711	+ // return HTTP 410 (gone) reponse.
	712	+ status_header( 410 );
	713	+ }
	714	+ }
	715	+ }
	716	+
	717	+ /**
	718	+ * Checks if cache dirs exist and create if not.
	719	+ * Returns false if not succesful.
	720	+ *
	721	+ * @return bool
	722	+ */
	723	+ public static function check_and_create_dirs() {
	724	+ if ( ! defined( 'AUTOPTIMIZE_CACHE_DIR' ) ) {
	725	+ // We didn't set a cache.
	726	+ return false;
	727	+ }
	728	+
	729	+ foreach ( array( '', 'js', 'css' ) as $dir ) {
	730	+ if ( ! self::check_cache_dir( AUTOPTIMIZE_CACHE_DIR . $dir ) ) {
253	731	return false;
254	732	}
255	733	}
	734	+ return true;
	735	+ }
256	736
257		- // check if we can now write
258		- if(!is_writable($dir)) {
	737	+ /**
	738	+ * Ensures the specified `$dir` exists and is writeable.
	739	+ * Returns false if that's not the case.
	740	+ *
	741	+ * @param string $dir Directory to check/create.
	742	+ *
	743	+ * @return bool
	744	+ */
	745	+ protected static function check_cache_dir( $dir )
	746	+ {
	747	+ // Try creating the dir if it doesn't exist.
	748	+ if ( ! file_exists( $dir ) ) {
	749	+ @mkdir( $dir, 0775, true ); // @codingStandardsIgnoreLine
	750	+ if ( ! file_exists( $dir ) ) {
	751	+ return false;
	752	+ }
	753	+ }
	754	+
	755	+ // If we still cannot write, bail.
	756	+ if ( ! is_writable( $dir ) ) {
259	757	return false;
260	758	}
261	759
262		- // and write index.html here to avoid prying eyes
263		- $indexFile=$dir.'/index.html';
264		- if(!is_file($indexFile)) {
265		- @file_put_contents($indexFile,'<html><head><meta name="robots" content="noindex, nofollow"></head><body>Generated by <a href="http://wordpress.org/extend/plugins/autoptimize/" rel="nofollow">Autoptimize</a></body></html>');
	760	+ // Create an index.html in there to avoid prying eyes!
	761	+ $idx_file = rtrim( $dir, '/\\' ) . '/index.html';
	762	+ if ( ! is_file( $idx_file ) ) {
	763	+ @file_put_contents( $idx_file, '<html><head><meta name="robots" content="noindex, nofollow"></head><body>Generated by <a href="http://wordpress.org/extend/plugins/autoptimize/" rel="nofollow">Autoptimize</a></body></html>' ); // @codingStandardsIgnoreLine
266	764	}
267		-
	765	+
268	766	return true;
269	767	}
	768	+
	769	+ /**
	770	+ * Flushes as many page cache plugin's caches as possible.
	771	+ *
	772	+ * @return void
	773	+ */
	774	+ // @codingStandardsIgnoreStart
	775	+ public static function flushPageCache()
	776	+ {
	777	+ if ( function_exists( 'wp_cache_clear_cache' ) ) {
	778	+ if ( is_multisite() ) {
	779	+ $blog_id = get_current_blog_id();
	780	+ wp_cache_clear_cache( $blog_id );
	781	+ } else {
	782	+ wp_cache_clear_cache();
	783	+ }
	784	+ } elseif ( has_action( 'cachify_flush_cache' ) ) {
	785	+ do_action( 'cachify_flush_cache' );
	786	+ } elseif ( function_exists( 'w3tc_pgcache_flush' ) ) {
	787	+ w3tc_pgcache_flush();
	788	+ } elseif ( function_exists( 'wp_fast_cache_bulk_delete_all' ) ) {
	789	+ wp_fast_cache_bulk_delete_all();
	790	+ } elseif ( function_exists( 'rapidcache_clear_cache' ) ) {
	791	+ rapidcache_clear_cache();
	792	+ } elseif ( class_exists( 'Swift_Performance_Cache' ) ) {
	793	+ Swift_Performance_Cache::clear_all_cache();
	794	+ } elseif ( class_exists( 'WpFastestCache' ) ) {
	795	+ $wpfc = new WpFastestCache();
	796	+ $wpfc->deleteCache();
	797	+ } elseif ( class_exists( 'c_ws_plugin__qcache_purging_routines' ) ) {
	798	+ c_ws_plugin__qcache_purging_routines::purge_cache_dir(); // quick cache
	799	+ } elseif ( class_exists( 'zencache' ) ) {
	800	+ zencache::clear();
	801	+ } elseif ( class_exists( 'comet_cache' ) ) {
	802	+ comet_cache::clear();
	803	+ } elseif ( class_exists( 'WpeCommon' ) ) {
	804	+ // WPEngine cache purge/flush methods to call by default
	805	+ $wpe_methods = array(
	806	+ 'purge_varnish_cache',
	807	+ );
	808	+
	809	+ // More agressive clear/flush/purge behind a filter
	810	+ if ( apply_filters( 'autoptimize_flush_wpengine_aggressive', false ) ) {
	811	+ $wpe_methods = array_merge( $wpe_methods, array( 'purge_memcached', 'clear_maxcdn_cache' ) );
	812	+ }
	813	+
	814	+ // Filtering the entire list of WpeCommon methods to be called (for advanced usage + easier testing)
	815	+ $wpe_methods = apply_filters( 'autoptimize_flush_wpengine_methods', $wpe_methods );
	816	+
	817	+ foreach ( $wpe_methods as $wpe_method ) {
	818	+ if ( method_exists( 'WpeCommon', $wpe_method ) ) {
	819	+ WpeCommon::$wpe_method();
	820	+ }
	821	+ }
	822	+ } elseif ( function_exists( 'sg_cachepress_purge_cache' ) ) {
	823	+ sg_cachepress_purge_cache();
	824	+ } elseif ( array_key_exists( 'KINSTA_CACHE_ZONE', $_SERVER ) ) {
	825	+ $_kinsta_clear_cache_url = 'https://localhost/kinsta-clear-cache-all';
	826	+ $_kinsta_response = wp_remote_get(
	827	+ $_kinsta_clear_cache_url,
	828	+ array(
	829	+ 'sslverify' => false,
	830	+ 'timeout' => 5,
	831	+ )
	832	+ );
	833	+ } elseif ( class_exists( 'RaidboxesNginxCacheFunctions' ) ) {
	834	+ $rb_cache_helper = new RaidboxesNginxCacheFunctions();
	835	+ $rb_cache_helper->purge_cache();
	836	+ } elseif ( defined('NGINX_HELPER_BASENAME') ) {
	837	+ do_action( 'rt_nginx_helper_purge_all' );
	838	+ } elseif ( file_exists( WP_CONTENT_DIR . '/wp-cache-config.php' ) && function_exists( 'prune_super_cache' ) ) {
	839	+ // fallback for WP-Super-Cache
	840	+ global $cache_path;
	841	+ if ( is_multisite() ) {
	842	+ $blog_id = get_current_blog_id();
	843	+ prune_super_cache( get_supercache_dir( $blog_id ), true );
	844	+ prune_super_cache( $cache_path . 'blogs/', true );
	845	+ } else {
	846	+ prune_super_cache( $cache_path . 'supercache/', true );
	847	+ prune_super_cache( $cache_path, true );
	848	+ }
	849	+ } elseif ( class_exists( 'NginxCache' ) ) {
	850	+ $nginx_cache = new NginxCache();
	851	+ $nginx_cache->purge_zone_once();
	852	+ }
	853	+ }
	854	+ // @codingStandardsIgnoreEnd
270	855	}