PHP - Laravel dependency injection: pass parameters to dependency constructor

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?

P.S. The code needs to be testable.

siannone · Accepted Answer · 2015-04-21 10:55:24Z

32

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());
        });
    }
}

edited Apr 21, 2015 at 10:55

answered Apr 21, 2015 at 8:57

siannone

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4 Comments

omarjebari Over a year ago

But what if your input doesn't have 'channel_name' set? This code may get called before you've had a chance to validate your input.

siannone Over a year ago

@omarjebari I guess that depends on where you're injecting Bloom\Security\ChannelAuthInterface which, in my case, is after the inputs have been validated.

Mathew Paret Over a year ago

I am looking for something similar. Is there a way to do this but for console/artisan input instead of HTTP request?

siannone Over a year ago

@MathewParet I guess the principle is the same. You just need to find out which interface you want to bind and return an instance of a class that implements that interface with your changes.

omarjebari · Accepted Answer · 2019-11-06 10:09:30Z

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 ...
}

ortegaONE · Accepted Answer · 2015-04-17 13:11:11Z

0

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.

edited Apr 17, 2015 at 13:11

answered Apr 17, 2015 at 13:01

ortegaONE

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