futtta /
autoptimize
Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like autoptimizeCache often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use autoptimizeCache, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 10 | class autoptimizeCache |
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| 11 | { |
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| 12 | /** |
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| 13 | * Cache filename. |
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| 14 | * |
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| 15 | * @var string |
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| 16 | */ |
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| 17 | private $filename; |
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| 18 | |||
| 19 | /** |
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| 20 | * Cache directory path (with a trailing slash). |
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| 21 | * |
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| 22 | * @var string |
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| 23 | */ |
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| 24 | private $cachedir; |
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| 25 | |||
| 26 | /** |
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| 27 | * Whether gzipping is done by the web server or us. |
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| 28 | * True => we don't gzip, the web server does it. |
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| 29 | * False => we do it ourselves. |
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| 30 | * |
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| 31 | * @var bool |
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| 32 | */ |
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| 33 | private $nogzip; |
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| 34 | |||
| 35 | /** |
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| 36 | * Ctor. |
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| 37 | * |
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| 38 | * @param string $md5 Hash. |
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| 39 | * @param string $ext Extension. |
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| 40 | */ |
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| 41 | public function __construct( $md5, $ext = 'php' ) |
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| 60 | |||
| 61 | /** |
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| 62 | * Returns true if the cached file exists on disk. |
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| 63 | * |
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| 64 | * @return bool |
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| 65 | */ |
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| 66 | public function check() |
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| 70 | |||
| 71 | /** |
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| 72 | * Returns cache contents if they exist, false otherwise. |
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| 73 | * |
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| 74 | * @return string|false |
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| 75 | */ |
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| 76 | public function retrieve() |
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| 87 | |||
| 88 | /** |
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| 89 | * Stores given $data in cache. |
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| 90 | * |
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| 91 | * @param string $data Data to cache. |
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| 92 | * @param string $mime Mimetype. |
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| 93 | * |
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| 94 | * @return void |
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| 95 | */ |
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| 96 | public function cache( $data, $mime ) |
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| 97 | { |
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| 98 | // readonly FS explicitly OK'ed by developer, so just pretend all is OK. |
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| 99 | if ( defined( 'AUTOPTIMIZE_CACHE_READONLY' ) ) { |
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| 100 | return true; |
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| 101 | } |
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| 102 | |||
| 103 | // off by default; check if cachedirs exist every time before caching |
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| 104 | // |
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| 105 | // to be activated for users that experience these ugly errors; |
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| 106 | // PHP Warning: file_put_contents failed to open stream: No such file or directory. |
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| 107 | if ( apply_filters( 'autoptimize_filter_cache_checkdirs_on_write', false ) ) { |
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| 108 | $this->check_and_create_dirs(); |
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| 109 | } |
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| 110 | |||
| 111 | if ( false === $this->nogzip ) { |
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| 112 | // We handle gzipping ourselves. |
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| 113 | $file = 'default.php'; |
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| 114 | $phpcode = file_get_contents( AUTOPTIMIZE_PLUGIN_DIR . 'config/' . $file ); |
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| 115 | $phpcode = str_replace( array( '%%CONTENT%%', 'exit;' ), array( $mime, '' ), $phpcode ); |
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| 116 | |||
| 117 | file_put_contents( $this->cachedir . $this->filename, $phpcode ); |
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| 118 | file_put_contents( $this->cachedir . $this->filename . '.none', $data ); |
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| 119 | } else { |
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| 120 | // Write code to cache without doing anything else. |
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| 121 | file_put_contents( $this->cachedir . $this->filename, $data ); |
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| 122 | |||
| 123 | // save fallback .js or .css file if filter true (to be false by default) but not if snippet or single. |
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| 124 | if ( self::do_fallback() && strpos( $this->filename, '_snippet_' ) === false && strpos( $this->filename, '_single_' ) === false ) { |
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| 125 | $_extension = pathinfo( $this->filename, PATHINFO_EXTENSION ); |
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| 126 | $_fallback_file = AUTOPTIMIZE_CACHEFILE_PREFIX . 'fallback.' . $_extension; |
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| 127 | if ( ( 'css' === $_extension || 'js' === $_extension ) && ! file_exists( $this->cachedir . $_extension . '/' . $_fallback_file ) ) { |
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| 128 | file_put_contents( $this->cachedir . $_extension . '/' . $_fallback_file, $data ); |
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| 129 | } |
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| 130 | } |
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| 131 | |||
| 132 | if ( apply_filters( 'autoptimize_filter_cache_create_static_gzip', false ) ) { |
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| 133 | // Create an additional cached gzip file. |
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| 134 | file_put_contents( $this->cachedir . $this->filename . '.gz', gzencode( $data, 9, FORCE_GZIP ) ); |
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| 135 | // If PHP Brotli extension is installed, create an additional cached Brotli file. |
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| 136 | if ( function_exists( 'brotli_compress' ) ) { |
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| 137 | file_put_contents( $this->cachedir . $this->filename . '.br', brotli_compress( $data, 11, BROTLI_GENERIC ) ); |
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| 138 | } |
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| 139 | } |
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| 140 | } |
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| 141 | |||
| 142 | // Provide 3rd party action hook for every cache file that is created. |
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| 143 | // This hook can for example be used to inject a copy of the created cache file to a other domain. |
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| 144 | do_action( 'autoptimize_action_cache_file_created', $this->cachedir . $this->filename ); |
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| 145 | } |
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| 146 | |||
| 147 | /** |
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| 148 | * Get cache filename. |
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| 149 | * |
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| 150 | * @return string |
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| 151 | */ |
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| 152 | public function getname() |
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| 153 | { |
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| 154 | // NOTE: This could've maybe been a do_action() instead, however, |
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| 155 | // that ship has sailed. |
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| 156 | // The original idea here was to provide 3rd party code a hook so that |
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| 157 | // it can "listen" to all the complete autoptimized-urls that the page |
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| 158 | // will emit... Or something to that effect I think? |
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| 159 | apply_filters( 'autoptimize_filter_cache_getname', AUTOPTIMIZE_CACHE_URL . $this->filename ); |
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| 160 | |||
| 161 | return $this->filename; |
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| 162 | } |
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| 163 | |||
| 164 | /** |
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| 165 | * Returns true if given `$file` is considered a valid Autoptimize cache file, |
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| 166 | * false otherwise. |
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| 167 | * |
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| 168 | * @param string $dir Directory name (with a trailing slash). |
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| 169 | * @param string $file Filename. |
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| 170 | * @return bool |
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| 171 | */ |
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| 172 | protected static function is_valid_cache_file( $dir, $file ) |
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| 173 | { |
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| 174 | if ( '.' !== $file && '..' !== $file && |
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| 175 | false !== strpos( $file, AUTOPTIMIZE_CACHEFILE_PREFIX ) && |
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| 176 | is_file( $dir . $file ) ) { |
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| 177 | |||
| 178 | // It's a valid file! |
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| 179 | return true; |
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| 180 | } |
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| 181 | |||
| 182 | // Everything else is considered invalid! |
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| 183 | return false; |
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| 184 | } |
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| 185 | |||
| 186 | /** |
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| 187 | * Clears contents of AUTOPTIMIZE_CACHE_DIR. |
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| 188 | * |
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| 189 | * @return void |
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| 190 | */ |
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| 191 | protected static function clear_cache_classic() |
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| 192 | { |
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| 193 | $contents = self::get_cache_contents(); |
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| 194 | foreach ( $contents as $name => $files ) { |
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| 195 | $dir = rtrim( AUTOPTIMIZE_CACHE_DIR . $name, '/' ) . '/'; |
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| 196 | foreach ( $files as $file ) { |
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| 197 | if ( self::is_valid_cache_file( $dir, $file ) ) { |
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| 198 | @unlink( $dir . $file ); // @codingStandardsIgnoreLine |
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| 199 | } |
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| 200 | } |
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| 201 | } |
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| 202 | |||
| 203 | @unlink( AUTOPTIMIZE_CACHE_DIR . '/.htaccess' ); // @codingStandardsIgnoreLine |
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| 204 | } |
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| 205 | |||
| 206 | /** |
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| 207 | * Recursively deletes the specified pathname (file/directory) if possible. |
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| 208 | * Returns true on success, false otherwise. |
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| 209 | * |
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| 210 | * @param string $pathname Pathname to remove. |
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| 211 | * |
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| 212 | * @return bool |
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| 213 | */ |
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| 214 | protected static function rmdir( $pathname ) |
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| 215 | { |
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| 216 | $files = self::get_dir_contents( $pathname ); |
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| 217 | foreach ( $files as $file ) { |
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| 218 | $path = $pathname . '/' . $file; |
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| 219 | if ( is_dir( $path ) ) { |
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| 220 | self::rmdir( $path ); |
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| 221 | } else { |
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| 222 | unlink( $path ); |
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| 223 | } |
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| 224 | } |
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| 225 | |||
| 226 | return rmdir( $pathname ); |
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| 227 | } |
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| 228 | |||
| 229 | /** |
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| 230 | * Clears contents of AUTOPTIMIZE_CACHE_DIR by renaming the current |
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| 231 | * cache directory into a new one with a unique name and then |
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| 232 | * re-creating the default (empty) cache directory. |
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| 233 | * |
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| 234 | * Important/ Fixme: this does not take multisite into account, so |
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| 235 | * if advanced_cache_clear_enabled is true (it is not by default) |
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| 236 | * then the content for all subsites is zapped! |
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| 237 | * |
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| 238 | * @return bool Returns true when everything is done successfully, false otherwise. |
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| 239 | */ |
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| 240 | protected static function clear_cache_via_rename() |
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| 241 | { |
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| 242 | $ok = false; |
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| 243 | $dir = self::get_pathname_base(); |
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| 244 | $new_name = self::get_unique_name(); |
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| 245 | |||
| 246 | // Makes sure the new pathname is on the same level... |
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| 247 | $new_pathname = dirname( $dir ) . '/' . $new_name; |
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| 248 | $renamed = @rename( $dir, $new_pathname ); // @codingStandardsIgnoreLine |
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| 249 | |||
| 250 | // When renamed, re-create the default cache directory back so it's |
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| 251 | // available again... |
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| 252 | if ( $renamed ) { |
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| 253 | $ok = self::cacheavail(); |
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| 254 | } |
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| 255 | |||
| 256 | return $ok; |
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| 257 | } |
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| 258 | |||
| 259 | /** |
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| 260 | * Returns true when advanced cache clearing is enabled. |
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| 261 | * |
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| 262 | * @return bool |
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| 263 | */ |
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| 264 | public static function advanced_cache_clear_enabled() |
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| 265 | { |
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| 266 | return apply_filters( 'autoptimize_filter_cache_clear_advanced', false ); |
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| 267 | } |
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| 268 | |||
| 269 | /** |
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| 270 | * Returns a (hopefully) unique new cache folder name for renaming purposes. |
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| 271 | * |
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| 272 | * @return string |
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| 273 | */ |
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| 274 | protected static function get_unique_name() |
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| 275 | { |
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| 276 | $prefix = self::get_advanced_cache_clear_prefix(); |
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| 277 | $new_name = uniqid( $prefix, true ); |
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| 278 | |||
| 279 | return $new_name; |
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| 280 | } |
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| 281 | |||
| 282 | /** |
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| 283 | * Get cache prefix name used in advanced cache clearing mode. |
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| 284 | * |
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| 285 | * @return string |
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| 286 | */ |
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| 287 | protected static function get_advanced_cache_clear_prefix() |
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| 288 | { |
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| 289 | $pathname = self::get_pathname_base(); |
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| 290 | $basename = basename( $pathname ); |
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| 291 | $prefix = $basename . '-artifact-'; |
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| 292 | |||
| 293 | return $prefix; |
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| 294 | } |
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| 295 | |||
| 296 | /** |
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| 297 | * Returns an array of file and directory names found within |
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| 298 | * the given $pathname without '.' and '..' elements. |
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| 299 | * |
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| 300 | * @param string $pathname Pathname. |
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| 301 | * |
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| 302 | * @return array |
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| 303 | */ |
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| 304 | protected static function get_dir_contents( $pathname ) |
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| 305 | { |
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| 306 | return array_slice( scandir( $pathname ), 2 ); |
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| 307 | } |
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| 308 | |||
| 309 | /** |
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| 310 | * Wipes directories which were created as part of the fast cache clearing |
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| 311 | * routine (which renames the current cache directory into a new one with |
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| 312 | * a custom-prefixed unique name). |
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| 313 | * |
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| 314 | * @return bool |
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| 315 | */ |
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| 316 | public static function delete_advanced_cache_clear_artifacts() |
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| 317 | { |
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| 318 | // Don't go through these motions (called from the cachechecker) if advanced cache clear isn't even active. |
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| 319 | if ( ! self::advanced_cache_clear_enabled() ) { |
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| 320 | return false; |
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| 321 | } |
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| 322 | |||
| 323 | $dir = self::get_pathname_base(); |
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| 324 | $prefix = self::get_advanced_cache_clear_prefix(); |
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| 325 | $parent = dirname( $dir ); |
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| 326 | $ok = false; |
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| 327 | |||
| 328 | // Returns the list of files without '.' and '..' elements. |
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| 329 | $files = self::get_dir_contents( $parent ); |
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| 330 | if ( is_array( $files ) && ! empty( $files ) ) { |
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| 331 | foreach ( $files as $file ) { |
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| 332 | $path = $parent . '/' . $file; |
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| 333 | $prefixed = ( false !== strpos( $path, $prefix ) ); |
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| 334 | // Removing only our own (prefixed) directories... |
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| 335 | if ( is_dir( $path ) && $prefixed ) { |
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| 336 | $ok = self::rmdir( $path ); |
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| 337 | } |
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| 338 | } |
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| 339 | } |
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| 340 | |||
| 341 | return $ok; |
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| 342 | } |
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| 343 | |||
| 344 | /** |
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| 345 | * Returns the cache directory pathname used. |
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| 346 | * Done as a function so we canSlightly different |
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| 347 | * if multisite is used and `autoptimize_separate_blog_caches` filter |
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| 348 | * is used. |
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| 349 | * |
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| 350 | * @return string |
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| 351 | */ |
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| 352 | public static function get_pathname() |
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| 353 | { |
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| 354 | $pathname = self::get_pathname_base(); |
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| 355 | |||
| 356 | View Code Duplication | if ( is_multisite() && apply_filters( 'autoptimize_separate_blog_caches', true ) ) { |
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| 357 | $blog_id = get_current_blog_id(); |
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| 358 | $pathname .= $blog_id . '/'; |
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| 359 | } |
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| 360 | |||
| 361 | return $pathname; |
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| 362 | } |
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| 363 | |||
| 364 | /** |
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| 365 | * Returns the base path of our cache directory. |
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| 366 | * |
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| 367 | * @return string |
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| 368 | */ |
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| 369 | protected static function get_pathname_base() |
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| 370 | { |
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| 371 | $pathname = WP_CONTENT_DIR . AUTOPTIMIZE_CACHE_CHILD_DIR; |
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| 372 | |||
| 373 | return $pathname; |
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| 374 | } |
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| 375 | |||
| 376 | /** |
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| 377 | * Deletes everything from the cache directories. |
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| 378 | * |
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| 379 | * @param bool $propagate Whether to trigger additional actions when cache is purged. |
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| 380 | * |
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| 381 | * @return bool |
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| 382 | */ |
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| 383 | public static function clearall( $propagate = true ) |
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| 384 | { |
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| 385 | if ( ! self::cacheavail() ) { |
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| 386 | return false; |
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| 387 | } |
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| 388 | |||
| 389 | // TODO/FIXME: If cache is big, switch to advanced/new cache clearing automatically? |
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| 390 | if ( self::advanced_cache_clear_enabled() ) { |
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| 391 | self::clear_cache_via_rename(); |
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| 392 | } else { |
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| 393 | self::clear_cache_classic(); |
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| 394 | } |
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| 395 | |||
| 396 | // Remove 404 handler if required. |
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| 397 | if ( self::do_fallback() ) { |
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| 398 | $_fallback_php = trailingslashit( WP_CONTENT_DIR ) . 'autoptimize_404_handler.php'; |
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| 399 | @unlink( $_fallback_php ); // @codingStandardsIgnoreLine |
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| 400 | } |
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| 401 | |||
| 402 | // Remove the transient so it gets regenerated... |
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| 403 | delete_transient( 'autoptimize_stats' ); |
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| 404 | |||
| 405 | // Cache was just purged, clear page cache and allow others to hook into our purging... |
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| 406 | if ( true === $propagate ) { |
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| 407 | if ( ! function_exists( 'autoptimize_do_cachepurged_action' ) ) { |
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| 408 | function autoptimize_do_cachepurged_action() { |
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| 411 | } |
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| 412 | add_action( 'shutdown', 'autoptimize_do_cachepurged_action', 11 ); |
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| 413 | add_action( 'autoptimize_action_cachepurged', array( 'autoptimizeCache', 'flushPageCache' ), 10, 0 ); |
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| 414 | } |
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| 415 | |||
| 416 | // Warm cache (part of speedupper)! |
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| 417 | if ( apply_filters( 'autoptimize_filter_speedupper', true ) && false == get_transient( 'autoptimize_cache_warmer_protector' ) ) { |
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| 418 | set_transient( 'autoptimize_cache_warmer_protector', 'I shall not warm cache for another 10 minutes.', 60 * 10 ); |
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| 419 | $url = site_url() . '/?ao_speedup_cachebuster=' . rand( 1, 100000 ); |
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| 420 | $url = apply_filters( 'autoptimize_filter_cache_warmer_url', $url ); |
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| 421 | $cache = @wp_remote_get( $url ); // @codingStandardsIgnoreLine |
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| 422 | unset( $cache ); |
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| 423 | } |
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| 424 | |||
| 427 | |||
| 428 | /** |
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| 429 | * Wrapper for clearall but with false param |
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| 430 | * to ensure the event is not propagated to others |
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| 431 | * through our own hooks (to avoid infinite loops). |
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| 432 | * |
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| 433 | * @return bool |
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| 434 | */ |
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| 435 | public static function clearall_actionless() |
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| 439 | |||
| 440 | /** |
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| 441 | * Returns the contents of our cache dirs. |
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| 442 | * |
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| 443 | * @return array |
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| 444 | */ |
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| 445 | protected static function get_cache_contents() |
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| 455 | |||
| 456 | /** |
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| 457 | * Returns stats about cached contents. |
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| 458 | * |
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| 459 | * @return array |
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| 460 | */ |
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| 461 | public static function stats() |
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| 484 | |||
| 485 | /** |
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| 486 | * Performs a scan of cache directory contents and returns an array |
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| 487 | * with 3 values: count, size, timestamp. |
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| 488 | * count = total number of found files |
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| 489 | * size = total filesize (in bytes) of found files |
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| 490 | * timestamp = unix timestamp when the scan was last performed/finished. |
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| 491 | * |
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| 492 | * @return array |
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| 493 | */ |
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| 494 | protected static function stats_scan() |
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| 527 | |||
| 528 | /** |
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| 529 | * Ensures the cache directory exists, is writeable and contains the |
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| 530 | * required .htaccess files. |
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| 531 | * Returns false in case it fails to ensure any of those things. |
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| 532 | * |
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| 533 | * @return bool |
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| 534 | */ |
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| 535 | public static function cacheavail() |
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| 624 | |||
| 625 | /** |
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| 626 | * Checks if fallback-php file exists and create it if not. |
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| 627 | * |
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| 628 | * Return bool |
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| 629 | */ |
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| 630 | public static function check_fallback_php() { |
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| 631 | $_fallback_filename = 'autoptimize_404_handler.php'; |
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| 632 | $_fallback_php = trailingslashit( WP_CONTENT_DIR ) . $_fallback_filename; |
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| 633 | $_fallback_status = true; |
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| 634 | |||
| 635 | if ( ! file_exists( $_fallback_php ) && is_writable( WP_CONTENT_DIR ) ) { |
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| 636 | $_fallback_php_contents = file_get_contents( AUTOPTIMIZE_PLUGIN_DIR . 'config/' . $_fallback_filename ); |
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| 637 | $_fallback_php_contents = str_replace( '<?php exit;', '<?php', $_fallback_php_contents ); |
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| 638 | $_fallback_php_contents = str_replace( '<!--ao-cache-dir-->', AUTOPTIMIZE_CACHE_DIR, $_fallback_php_contents ); |
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| 639 | if ( apply_filters( 'autoptimize_filter_cache_fallback_log_errors', false ) ) { |
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| 640 | $_fallback_php_contents = str_replace( '// error_log', 'error_log', $_fallback_php_contents ); |
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| 641 | } |
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| 642 | $_fallback_status = file_put_contents( $_fallback_php, $_fallback_php_contents ); |
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| 643 | } |
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| 644 | |||
| 645 | return $_fallback_status; |
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| 646 | } |
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| 647 | |||
| 648 | /** |
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| 649 | * Tells if AO should try to avoid 404's by creating fallback filesize |
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| 650 | * and create a php 404 handler and tell .htaccess to redirect to said handler |
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| 651 | * and hook into WordPress to redirect 404 to said handler as well. NGINX users |
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| 652 | * are smart enough to get this working, no? ;-) |
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| 653 | * |
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| 654 | * Return bool |
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| 655 | */ |
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| 656 | public static function do_fallback() { |
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| 665 | |||
| 666 | /** |
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| 667 | * Hooks into template_redirect, will act on 404-ing requests for |
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| 668 | * Autoptimized files and redirects to the fallback CSS/ JS if available |
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| 669 | * and 410'ing ("Gone") if fallback not available. |
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| 670 | */ |
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| 671 | public static function wordpress_notfound_fallback() { |
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| 700 | |||
| 701 | /** |
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| 702 | * Checks if cache dirs exist and create if not. |
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| 703 | * Returns false if not succesful. |
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| 704 | * |
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| 705 | * @return bool |
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| 706 | */ |
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| 707 | public static function check_and_create_dirs() { |
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| 720 | |||
| 721 | /** |
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| 722 | * Ensures the specified `$dir` exists and is writeable. |
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| 723 | * Returns false if that's not the case. |
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| 724 | * |
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| 725 | * @param string $dir Directory to check/create. |
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| 726 | * |
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| 727 | * @return bool |
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| 728 | */ |
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| 729 | protected static function check_cache_dir( $dir ) |
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| 752 | |||
| 753 | /** |
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| 754 | * Flushes as many page cache plugin's caches as possible. |
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| 755 | * |
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| 756 | * @return void |
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| 757 | */ |
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| 758 | // @codingStandardsIgnoreStart |
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| 759 | public static function flushPageCache() |
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| 835 | // @codingStandardsIgnoreEnd |
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| 836 | } |
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| 837 |
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When comparing two booleans, it is generally considered safer to use the strict comparison operator.