The Framework Code

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<?php
/**
 * Handle assets access if that is what is wanted
 *
 * @author Lindsay Marshall <lindsay.marshall@ncl.ac.uk>
 * @copyright 2016-2021 Newcastle University
 * @package Framework
 * @subpackage SystemPages
 */
    namespace Framework\Pages;

    use \Support\Context;
/**
 * Handle all the cacheing stuff and maybe return a file
 */
    class Assets extends \Framework\SiteAction
    {
/** @var string The file name */
        private string $file = '';
/** @var int    Last modified time for the file */
        private int $mtime = 0;
/** @var array<string> Mime type values */
        private static array $mtypes = [
            ''      => 'text/plain',
            'css'   => 'text/css',
            'js'    => 'text/javascript',
            'png'   => 'image/png',
            'jpg'   => 'image/jpeg',
            'jpeg'  => 'image/jpeg',
            'gif'   => 'image/gif',
            'ico'   => 'image/x-icon',
        ];
/**
 * Handle access to things in assets
 *
 * You can rely on Apache to deal with these things normally, however if
 * you really want to get cacheability to be complete you either have to go through hoops
 * in the Apache config or you code it in here!
 *
 * @param Context   $context    The context object for the site
 */
        public function handle(Context $context) : array|string
        {
            \chdir($context->local()->assetsdir());

            $rest = $context->rest();
            $this->file = implode(DIRECTORY_SEPARATOR, $rest);
            $this->mtime = filemtime($this->file);
/**
 * PHP file info does not give the correct mime type for compressed css files
 * so we need to do it ourselves which is a pain
 */
            $fname = \array_pop($rest);
            /** @psalm-suppress PossiblyFalseArgument */
            $dotp = strrchr($fname, '.');
            if ($dotp !== FALSE)
            {
                $ext = \strtolower(\substr($dotp, 1));
            }
            else
            {
                $ext = '';
            }
            $mime =  self::$mtypes[$ext] ??  \Framework\Support\Security::getInstance()->mimetype($this->file);
            $mag = $this->makemaxage($context);
            $web = $context->web();
            $web->addheader([
//              'Last-Modified' => $this->makemod($this->mtime),
                'Etag'          => '"'.$this->makeetag($context).'"',
                'Expires'       => $this->makemod(time()+$mag),
                'Cache-Control' => 'max-age='.$mag.',stale-while-revalidate=86400,stale-if-error=259200',
            ]);
            $this->ifmodcheck($context);
            $web->sendfile($this->file, $fname, $mime);
            return '';
        }
/**
 * Make an etag - overrides the function in SiteAction
 *
 * @param Context   $context   The context object for the site
 */
        public function makeetag(Context $context) : string
        {
            return \sprintf('%u', \crc32($this->file)).'-'.$this->mtime.'-'.($context->web()->acceptgzip() ? 1 : 0);
        }
/**
 * Check an etag to see if we need to send the page again or not.
 *
 * @param Context   $context    The context object for the site
 * @param string    $tag        The etag value to check
 */
        public function checketag(Context $context, string $tag) : bool
        {
            return \substr($tag, 0, -1) === \substr($this->makeetag($context), 0, -1);
        }
/**
 * Make a maximum age - overrides function in SiteAction
 *
 * An hour for the most recent volume and a year for everything else
 *
 * @param Context    $context   The context object for the site
 * @phpcsSuppress SlevomatCodingStandard.Functions.UnusedParameter
 */
        public function makemaxage(Context $context) : int
        {
            return 3600*24*365; // make it a year
        }
/**
 * Check a timestamp to see if we need to send the page again or not - overriding method in SiteAction
 *
 * @param Context   $context    The context object for the site
 * @param string    $time       The time value to check
 * @phpcsSuppress SlevomatCodingStandard.Functions.UnusedParameter
 */
        public function checkmodtime(Context $context, string $time) : bool
        {
            return $this->mtime > $time;
        }
    }
?>