Diff for cache_enabler_disk.class.php to add wp_is_mobile() support to KeyCDN's Cache Enabler plugin

cache_enabler_disk.class.php.patch

--- cache_enabler_disk.class.php.org    2016-09-26 07:24:22.000000000 +0200
+++ cache_enabler_disk.class.php        2016-10-24 16:33:54.145108306 +0200
@@ -24,7 +24,9 @@
        */
 
        const FILE_HTML = 'index.html';
+       const FILE_HTML_MOBILE = 'index-mobile.html';
        const FILE_GZIP = 'index.html.gz';
+       const FILE_GZIP_MOBILE = 'index-mobile.html.gz';
        const FILE_WEBP_HTML = 'index-webp.html';
        const FILE_WEBP_GZIP = 'index-webp.html.gz';
 
@@ -169,7 +171,9 @@
                );
 
                @unlink($path.self::FILE_HTML);
+               @unlink($path.self::FILE_HTML_MOBILE);
                @unlink($path.self::FILE_GZIP);
+               @unlink($path.self::FILE_GZIP_MOBILE);
                @unlink($path.self::FILE_WEBP_HTML);
                @unlink($path.self::FILE_WEBP_GZIP);
        }
@@ -218,15 +222,29 @@
                }
 
                // check encoding and deliver gzip file if support
-               if ( $http_accept_encoding && ( strpos($http_accept_encoding, 'gzip') !== false ) && is_readable( self::_file_gzip() )  ) {
-                       header('Content-Encoding: gzip');
-                       readfile( self::_file_gzip() );
-                       exit;
+               if ( $http_accept_encoding && ( strpos($http_accept_encoding, 'gzip') !== false ) && is_readable( self::_file_gzip() ) ) {
+                       if ( wp_is_mobile() ) {
+                               header('Content-Encoding: gzip');
+                               readfile( self::_file_gzip_mobile() );
+                               exit;
+                       }
+                       else {
+                               header('Content-Encoding: gzip');
+                               readfile( self::_file_gzip() );
+                               exit;
+                       }
                }
 
                // deliver cached file (default)
-               readfile( self::_file_html() );
-               exit;
+               if ( wp_is_mobile() ) {
+                       readfile( self::_file_mobile_html() );
+                       exit;
+               }
+               else {
+                       readfile( self::_file_html() );
+                       exit;
+               }
+
        }
 
 
@@ -273,14 +291,25 @@
                // cache enabler options
                $options = Cache_Enabler::$options;
 
-               // create files
-               self::_create_file( self::_file_html(), $data.$cache_signature." (html) -->" );
-
-               // create pre-compressed file
-               if ($options['compress']) {
-                       self::_create_file( self::_file_gzip(), gzencode($data.$cache_signature." (html gzip) -->", 9) );
+               if ( wp_is_mobile() ) {
+                       // create files
+                       if ($options['compress']) {
+                               self::_create_file( self::_file_gzip_mobile(), gzencode($data.$cache_signature." (html mobile gzip) -->", 9) );
+                       }
+                       else {
+                               self::_create_file( self::_file_mobile_html(), $data.$cache_signature." (html mobile) -->" );
+                       }
+               }
+               else {
+                       // create files
+                       // create pre-compressed file
+                       if ($options['compress']) {
+                               self::_create_file( self::_file_gzip(), gzencode($data.$cache_signature." (html gzip) -->", 9) );
+                       }
+                       else {
+                               self::_create_file( self::_file_html(), $data.$cache_signature." (html) -->" );
+                       }
                }
-
                // create webp supported files
                if ($options['webp']) {
                        // magic regex rule
@@ -458,7 +487,6 @@
                return trailingslashit($path);
        }
 
-
        /**
        * get file path
        *
@@ -472,6 +500,19 @@
                return self::_file_path(). self::FILE_HTML;
        }
 
+       /**
+       * get mobile file path
+       *
+       * @since   1.0.0
+       * @change  1.0.7
+       *
+       * @return  string  path to the mobile html file
+       */
+
+       private static function _file_mobile_html() {
+               return self::_file_path(). self::FILE_HTML_MOBILE;
+       }
+
 
        /**
        * get gzip file path
@@ -486,6 +527,18 @@
                return self::_file_path(). self::FILE_GZIP;
        }
 
+       /**
+       * get gzip file path
+       *
+       * @since   1.0.1
+       * @change  1.0.7
+       *
+       * @return  string  path to the gzipped mobile html file
+       */
+
+       private static function _file_gzip_mobile() {
+               return self::_file_path(). self::FILE_GZIP_MOBILE;
+       }
 
        /**
        * get webp file path
@@ -638,3 +691,4 @@
        }
 
 }
+

Reference for this gist: https://wordpress.org/support/topic/mobile-device-support-2/