WordPressMultisiteSubdirectoryValetDriver.php

<?php
namespace Valet\Drivers\Custom;

use Valet\Drivers\BasicValetDriver;

class WordPressMultisiteSubdirectoryValetDriver extends BasicValetDriver
{
    public $wp_root = false; // "wp"

    /**
     * Determine if the driver serves the request.
     *
     * @param  string  $sitePath
     * @param  string  $siteName
     * @param  string  $uri
     * @return bool
     */
    public function serves(string $sitePath, string $siteName, string $uri): bool
    {
        // Look for MULTISITE in wp-config.php. It should be there for multisite installs.
        return file_exists($sitePath . '/wp-config.php') && strpos( file_get_contents($sitePath . '/wp-config.php'), 'MULTISITE') !== false;
    }

    /**
     * Get the fully resolved path to the application's front controller.
     *
     * @param  string  $sitePath
     * @param  string  $siteName
     * @param  string  $uri
     * @return string
     */
    public function frontControllerPath(string $sitePath, string $siteName, string $uri): ? string
    {
        $_SERVER['PHP_SELF']    = $uri;
        $_SERVER['SERVER_ADDR'] = '127.0.0.1';
        $_SERVER['SERVER_NAME'] = $_SERVER['HTTP_HOST'];

        // If URI contains one of the main WordPress directories, and it's not a request for the Network Admin,
        // drop the subdirectory segment before routing the request
        if ( ( stripos($uri, 'wp-admin') !== false || stripos($uri, 'wp-content') !== false || stripos($uri, 'wp-includes') !== false ) ) {

            if ( stripos($uri, 'wp-admin/network') === false ) {
                $uri = substr($uri, stripos($uri, '/wp-') );
            }

            if ( $this->wp_root !== false && file_exists($sitePath . "/{$this->wp_root}/wp-admin") ) {
                $uri = "/{$this->wp_root}" . $uri;
            }
        }

        // Handle wp-cron.php properly
        if ( stripos($uri, 'wp-cron.php') !== false ) {
            $new_uri = substr($uri, stripos($uri, '/wp-') );

            if ( file_exists( $sitePath . $new_uri ) ) {
                return $sitePath . $new_uri;
            }
        }

        return parent::frontControllerPath(
            $sitePath, $siteName, $this->forceTrailingSlash($uri)
        );
    }

    public function isStaticFile(string $sitePath, string $siteName, string $uri)
    {
        // If the URI contains one of the main WordPress directories and it doesn't end with a slash,
        // drop the subdirectory from the URI and check if the file exists. If it does, return the new uri.
        if ( stripos($uri, 'wp-admin') !== false || stripos($uri, 'wp-content') !== false || stripos($uri, 'wp-includes') !== false ) {
                if ( substr($uri, -1, 1) == "/" ) return false;

                $new_uri = substr($uri, stripos($uri, '/wp-') );

            if ( $this->wp_root !== false && file_exists($sitePath . "/{$this->wp_root}/wp-admin") ) {
                $new_uri = "/{$this->wp_root}" . $new_uri;
            }

                if ( file_exists( $sitePath . $new_uri ) ) {
                        return $sitePath . $new_uri;
                }
        }

        return parent::isStaticFile( $sitePath, $siteName, $uri );
    }

    /**
     * Redirect to uri with trailing slash.
     *
     * @param  string $uri
     * @return string
     */
    private function forceTrailingSlash($uri): ? string
    {
        if (substr($uri, -1 * strlen('/wp-admin')) == '/wp-admin') {
            header('Location: '.$uri.'/'); die;
        }
        return $uri;
    }
}