framework/src/Extend/Frontend.php

<?php

/*
 * This file is part of Flarum.
 *
 * (c) Toby Zerner <toby.zerner@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Flarum\Extend;

use Flarum\Extension\Extension;
use Flarum\Frontend\Asset\ExtensionAssets;
use Flarum\Frontend\CompilerFactory;
use Flarum\Http\RouteCollection;
use Flarum\Http\RouteHandlerFactory;
use Illuminate\Contracts\Container\Container;

class Frontend implements ExtenderInterface
{
    protected $frontend;

    protected $css = [];
    protected $js;
    protected $routes = [];

    public function __construct($frontend)
    {
        $this->frontend = $frontend;
    }

    public function css($path)
    {
        $this->css[] = $path;

        return $this;
    }

    public function js($path)
    {
        $this->js = $path;

        return $this;
    }

    public function route($path, $name, $content = null)
	{
		$this->routes[] = compact('path', 'name', 'content');

		return $this;
	}

	public function __invoke(Container $container, Extension $extension = null)
	{
		$this->registerAssets($container, $extension);
		$this->registerRoutes($container);
	}

    private function registerAssets(Container $container, Extension $extension)
	{
		if (empty($this->css) && empty($this->js)) {
			return;
		}

		$container->resolving(
			"flarum.$this->frontend.assets",
			function (CompilerFactory $assets) use ($extension) {
				$assets->add(function () use ($extension) {
					return new ExtensionAssets(
						$extension, $this->css, $this->js
					);
				});
			}
		);
	}

	private function registerRoutes(Container $container)
	{
        if (empty($this->routes)) {
        	return;
		}

		$routes = $container->make("flarum.$this->frontend.routes");
		$factory = $container->make(RouteHandlerFactory::class);

		foreach ($this->routes as $route) {
			$routes->get(
				$route['path'], $route['name'],
				$factory->toForum($route['content'])
			);
		}
    }
}