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 cache file.
	 * @return void
	 */
	private function write_cache_file( $cache_filepath, $content ) {
		$gzip_filepath      = $cache_filepath . '_gzip';
		$temp_filepath      = $cache_filepath . '_temp';
		$temp_gzip_filepath = $gzip_filepath . '_temp';

		if ( rocket_direct_filesystem()->exists( $temp_filepath ) ) {
			return;
		}

		// Save the cache file.
		rocket_put_content( $temp_filepath, $content );
		rocket_direct_filesystem()->move( $temp_filepath, $cache_filepath, true );

		if ( function_exists( 'gzencode' ) ) {
			/**
			 * Filters the Gzip compression level to use for the cache file
			 *
			 * @param int $compression_level Compression level between 0 and 9.
			 */
			$compression_level = apply_filters( 'rocket_gzencode_level_compression', 6 );

			rocket_put_content( $temp_gzip_filepath, gzencode( $content, $compression_level ) );
			rocket_direct_filesystem()->move( $temp_gzip_filepath, $gzip_filepath, true );
		}
	}

	/**
	 * Get the path to the cache file.
	 *
	 * @since  3.3
	 *
	 * @param  array $args {
	 *     A list of arguments.
	 *
	 *     @type bool $webp Set to false to prevent adding the part related to webp.
	 * }
	 * @return string
	 */
	public function get_cache_path( $args = [] ) {
		$args             = array_merge(
			[
				'webp' => true,
			],
			$args
		);
		$cookies          = $this->tests->get_cookies();
		$request_uri_path = $this->get_request_cache_path( $cookies );
		$filename         = 'index';

		$filename = $this->maybe_mobile_filename( $filename );

		// Rename the caching filename for SSL URLs.
		if ( is_ssl() && $this->config->get_config( 'cache_ssl' ) ) {
			$filename .= '-https';
		}

		if ( $args['webp'] ) {
			$filename = $this->maybe_webp_filename( $filename );
		}

		$filename = $this->maybe_dynamic_cookies_filename( $filename, $cookies );

		// Ensure proper formatting of the path.
		$request_uri_path = preg_replace_callback( '/%[0-9A-F]{2}/', [ $this, 'reset_lowercase' ], $request_uri_path );
		// Directories in Windows can't contain question marks.
		$request_uri_path = str_replace( '?', '#', $request_uri_path );
		// Limit filename max length to 255 characters.
		$request_uri_path .= '/' . substr( $filename, 0, 250 ) . '.html';

		return $request_uri_path;
	}

	/** ----------------------------------------------------------------------------------------- */
	/** VARIOUS TOOLS =========================================================================== */
	/** ----------------------------------------------------------------------------------------- */
	/**
	 * Declares and sets value of constant preventing Optimizations.
	 *
	 * @since  3.3
	 */
	private function define_donotoptimize_true() {
		if ( ! defined( 'DONOTROCKETOPTIMIZE' ) ) {
			define( 'DONOTROCKETOPTIMIZE', true ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals
		}
	}

	/**
	 * Gets If-modified-since header value
	 *
	 * @since 3.3
	 * @return string
	 */
	private function get_if_modified_since() {
		if ( function_exists( 'apache_request_headers' ) ) {
			$headers = apache_request_headers();

			return isset( $headers['If-Modified-Since'] ) ? $headers['If-Modified-Since'] : '';
		}

		return $this->config->get_server_input( 'HTTP_IF_MODIFIED_SINCE', '' );
	}

	/**
	 * Get WP Rocket footprint
	 *
	 * @since 3.0.5 White label footprint if WP_ROCKET_WHITE_LABEL_FOOTPRINT is defined.
	 * @since 2.0
	 *
	 * @param int $time UNIX timestamp when the cache file was saved.
	 * @return string The footprint that will be printed
	 */
	private function get_rocket_footprint( $time = '' ) {
		$footprint = defined( 'WP_ROCKET_WHITE_LABEL_FOOTPRINT' ) ?
						"\n" . '<!-- Cached for great performance' :
						"\n" . '<!-- This website is like a Rocket, isn\'t it? Performance optimized by ' . WP_ROCKET_PLUGIN_NAME . '. Learn more: https://wp-rocket.me';
		if ( ! empty( $time ) ) {
			$footprint .= ' - Debug: cached@' . $time;
		}
		$footprint .= ' -->';
		return $footprint;
	}

	/**
	 * Create a hidden empty file for mobile detection on NGINX with the Rocket NGINX configuration.
	 *
	 * @param string $cache_dir_path Path to the current cache directory.
	 * @return void
	 */
	private function maybe_create_nginx_mobile_file( $cache_dir_path ) {
		global $is_nginx;

		if ( ! $this->config->get_config( 'do_caching_mobile_files' ) ) {
			return;
		}

		if ( ! $is_nginx ) {
			return;
		}

		$nginx_mobile_detect = $cache_dir_path . '/.mobile-active';

		if ( rocket_direct_filesystem()->exists( $nginx_mobile_detect ) ) {
			return;
		}

		rocket_direct_filesystem()->touch( $nginx_mobile_detect );
	}

	/**
	 * Create a hidden empty file when webp is enabled but the buffer doesn’t contain webp files.
	 *
	 * @since  3.4
	 *
	 * @param string $cache_dir_path Path to the current cache directory (without trailing slah).
	 */
	private function maybe_create_nowebp_file( $cache_dir_path ) {
		$nowebp_filepath = $cache_dir_path . DIRECTORY_SEPARATOR . '.no-webp';

		if ( rocket_direct_filesystem()->exists( $nowebp_filepath ) ) {
			return;
		}

		rocket_direct_filesystem()->touch( $nowebp_filepath );
	}

	/**
	 * Tell if generating cache files is allowed.
	 *
	 * @since  3.3
	 *
	 * @return bool
	 */
	public static function can_generate_caching_files() {
		/**
		 * Allow to the generate the caching file.
		 *
		 * @since 2.5
		 *
		 * @param bool True will force the cache file generation.
		 */
		return (bool) apply_filters( 'do_rocket_generate_caching_files', true ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals
	}

	/**
	 * Gets the base cache path for the current request
	 *
	 * @since 3.3
	 *
	 * @param array $cookies Cookies for the current request.
	 * @return string
	 */
	private function get_request_cache_path( $cookies ) {
		$host = $this->config->get_host();

		if ( $this->config->get_config( 'url_no_dots' ) ) {
			$host = str_replace( '.', '_', $host );
		}

		$request_uri              = $this->tests->get_clean_request_uri();
		$cookie_hash              = $this->config->get_config( 'cookie_hash' );
		$logged_in_cookie         = $this->config->get_config( 'logged_in_cookie' );
		$logged_in_cookie_no_hash = str_replace( $cookie_hash, '', $logged_in_cookie );

		// Get cache folder of host name.
		if ( $logged_in_cookie && isset( $cookies[ $logged_in_cookie ] ) && ! $this->tests->has_rejected_cookie( $logged_in_cookie_no_hash ) ) {
			if ( $this->config->get_config( 'common_cache_logged_users' ) ) {
				return $this->cache_dir_path . $host . '-loggedin-' . $this->config->get_config( 'secret_cache_key' ) . rtrim( $request_uri, '/' );
			}

			$user_key = explode( '|', $cookies[ $logged_in_cookie ] );
			$user_key = reset( $user_key );
			$user_key = $user_key . '-' . $this->config->get_config( 'secret_cache_key' );

			// Get cache folder of host name.
			return $this->cache_dir_path . $host . '-' . $user_key . rtrim( $request_uri, '/' );
		}

		return $this->cache_dir_path . $host . rtrim( $request_uri, '/' );
	}

	/**
	 * Modifies the filename if the request is from a mobile device.
	 *
	 * @since 3.3
	 *
	 * @param string $filename Cache filename.
	 * @return string
	 */
	private function maybe_mobile_filename( $filename ) {
		$cache_mobile_files_tablet = $this->config->get_config( 'cache_mobile_files_tablet' );

		if ( ! ( $this->config->get_config( 'cache_mobile' ) && $this->config->get_config( 'do_caching_mobile_files' ) ) ) {
			return $filename;
		}

		if ( ! $cache_mobile_files_tablet ) {
			return $filename;
		}

		if ( ! class_exists( 'WP_Rocket_Mobile_Detect' ) ) {
			return $filename;
		}

		$detect = new \WP_Rocket_Mobile_Detect();

		if ( $detect->isMobile() && ! $detect->isTablet() && 'desktop' === $cache_mobile_files_tablet || ( $detect->isMobile() || $detect->isTablet() ) && 'mobile' === $cache_mobile_files_tablet ) {
				return $filename .= '-mobile';
		}

		return $filename;
	}

	/**
	 * Modifies the filename if the request is WebP compatible
	 *
	 * @since 3.4
	 *
	 * @param string $filename Cache filename.
	 * @return string
	 */
	private function maybe_webp_filename( $filename ) {
		if ( ! $this->config->get_config( 'cache_webp' ) ) {
			return $filename;
		}

		/**
		 * Force WP Rocket to disable its webp cache.
		 *
		 * @since  3.4
		 *
		 * @param bool $disable_webp_cache Set to true to disable the webp cache.
		 */
		$disable_webp_cache = apply_filters( 'rocket_disable_webp_cache', false );

		if ( $disable_webp_cache ) {
			return $filename;
		}

		$http_accept = $this->config->get_server_input( 'HTTP_ACCEPT', '' );

		if ( ! $http_accept && function_exists( 'apache_request_headers' ) ) {
			$headers     = apache_request_headers();
			$http_accept = isset( $headers['Accept'] ) ? $headers['Accept'] : '';
		}

		if ( ! $http_accept || false === strpos( $http_accept, 'webp' ) ) {
			if ( preg_match( '#Firefox/(?<version>[0-9]{2})#i', $this->config->get_server_input( 'HTTP_USER_AGENT' ), $matches ) ) {
				if ( 66 <= (int) $matches['version'] ) {
					return $filename . '-webp';
				}
			}

			return $filename;
		}

		return $filename . '-webp';
	}

	/**
	 * Modifies the filename if dynamic cookies are set
	 *
	 * @param string $filename Cache filename.
	 * @param array  $cookies  Cookies for the request.
	 * @return string
	 */
	private function maybe_dynamic_cookies_filename( $filename, $cookies ) {
		$cache_dynamic_cookies = $this->config->get_config( 'cache_dynamic_cookies' );

		if ( ! $cache_dynamic_cookies ) {
			return $filename;
		}

		foreach ( $cache_dynamic_cookies as $key => $cookie_name ) {
			if ( is_array( $cookie_name ) ) {
				if ( isset( $_COOKIE[ $key ] ) ) {
					foreach ( $cookie_name as $cookie_key ) {
						if ( '' !== $cookies[ $key ][ $cookie_key ] ) {
							$cache_key = $cookies[ $key ][ $cookie_key ];
							$cache_key = preg_replace( '/[^a-z0-9_\-]/i', '-', $cache_key );
							$filename .= '-' . $cache_key;
						}
					}
				}
				continue;
			}

			if ( isset( $cookies[ $cookie_name ] ) && '' !== $cookies[ $cookie_name ] ) {
				$cache_key = $cookies[ $cookie_name ];
				$cache_key = preg_replace( '/[^a-z0-9_\-]/i', '-', $cache_key );
				$filename .= '-' . $cache_key;
			}
		}

		return $filename;
	}

	/**
	 * Force lowercase on encoded url strings from different alphabets to prevent issues on some hostings.
	 *
	 * @since  3.3
	 *
	 * @param  array $matches Cache path.
	 * @return string         Cache path in lowercase.
	 */
	protected function reset_lowercase( $matches ) {
		return strtolower( $matches[0] );
	}
}