PHP - Laravel 依赖注入：将参数传递给依赖构造函数

Question

I'm building a Laravel project and in one of the controllers I'm injecting two dependencies in a method:

public function pusherAuth(Request $request, ChannelAuth $channelAuth) { ... }

My question is really simple: How do I pass parameters to the $channelAuth dependency?

At the moment I'm using some setters to pass the needed dependencies:

public function pusherAuth(Request $request, ChannelAuth $channelAuth)
{
    $channelAuth
        ->setChannel($request->input('channel'))
        ->setUser(Auth::user());

What are the alternatives to this approach?

PS The code needs to be testable.

Answer 1

Thanks to the help I received on this Laracast discussion I was able to answer this question. Using a service provider it's possible to initialize the dependency by passing the right parameters to the constructor. This is the service provider I created:

<?php namespace App\Providers;

use Security\ChannelAuth;
use Illuminate\Contracts\Auth\Guard;
use Illuminate\Http\Request;
use Illuminate\Support\ServiceProvider;

class ChannelAuthServiceProvider extends ServiceProvider {

    /**
     * Bootstrap the application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }

    /**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
        $this->app->bind('Bloom\Security\ChannelAuthInterface', function()
        {
            $request = $this->app->make(Request::class);
            $guard   = $this->app->make(Guard::class);

            return new ChannelAuth($request->input('channel_name'), $guard->user());
        });
    }
}

Answer 2

You can pass parameters (as a string indexed array) when resolving a dependence like this:

<?php namespace App\Providers;

use Security\ChannelAuth;
use Illuminate\Contracts\Auth\Guard;
use Illuminate\Support\ServiceProvider;

class ChannelAuthServiceProvider extends ServiceProvider {

    /**
     * Bootstrap the application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }

    /**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
        $this->app->bind('Bloom\Security\ChannelAuthInterface', function($params)
        {
            $channelName = $params['channelName'];
            $guard   = $this->app->make(Guard::class);

            return new ChannelAuth($channelName, $guard->user());
        });
    }
}

Then when resolving eg in a controller:

public function pusherAuth()
{
    $channelAuth = app()->makeWith('Bloom\Security\ChannelAuthInterface', [
        'channelName' => $request->input('channel_name')
    ]);
    // ... use $channelAuth ...
}

Answer 3

If you want to inject the dependency through type hint you should use Factory pattern

public function pusherAuth(Request $request, ChannelAuthFactory $channelAuthFactory)
{
    $channelAuth = $channelAuthFactory->from($request->input('channel'), $request->user());

Answer 4

You can create and register your own service provider and create object with constructor's requests parameters.

I don't know how to do this in Laravel, but in Symfony2 you can inject in your own service something like RequestStack. It's the best way, because you have small service providers that are fully testable.