Laravel - Passing variables from Middleware to controller/route

Question

How can I pass variables from a middleware to a controller or a route that executes such middleware? I saw some post about appending it to the request like this:

$request->attributes->add(['key' => $value);

also others sugested using flash:

Session::flash('key', $value);

but I am not sure if that is best practice, or if there is a better way to do this? Here is my Middleware and route:

namespace App\Http\Middleware;

use Closure;

class TwilioWorkspaceCapability
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request $request
     * @param  \Closure $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $workspaceCapability = new \Services_Twilio_TaskRouter_Workspace_Capability("xxxxx", "xxxx", "xxxx");
        $workspaceCapability->allowFetchSubresources();
        $workspaceCapability->allowDeleteSubresources();
        $workspaceCapability->allowUpdatesSubresources();
        $token = $workspaceCapability->generateToken();
        //how do I pass variable $token back to the route that called this middleware
        return $next($request);
    }
}

Route::get('/manage', ['middleware' => 'twilio.workspace.capability', function (Request $request) {
    return view('demo.manage', [
        'manage_link_class' => 'active',
        'twilio_workspace_capability' => //how do I get the token here?...
    ]);
}]);

FYI the reason I decided to use a middleware for this is because I plan to cache the token for its lifecycle otherwise this would be a horrible implementation, since I would request a new token on every request.

mdamia · Accepted Answer · 2015-08-26 18:28:16Z

pass key value pair like this

$route = route('routename',['id' => 1]);

or to your action

$url = action('UserController@profile', ['id' => 1]);

You can pass data the view using with

 return view('demo.manage', [
    'manage_link_class' => 'active',
    'twilio_workspace_capability' => //how do I get the token here?...
]) -> with('token',$token);

in your middleware

 public function handle($request, Closure $next)
 {
    $workspaceCapability = new .....
    ...
    $request -> attributes('token' => $token);

    return $next($request);
 }

in your controller

 return Request::get('token');

note for Laravel 5 this is how to add parameters in the request: $request->attributes->add(['myAttribute' => 'myValue']); — Ben Dubuisson, Nov 8 '16 at 1:28

score 1 · Answer 2

I would leverage laravel's IOC container for this.

in your AppServiceProvider's register method

$this->app->singleton(TwilioWorkspaceCapability::class, function() { return new TwilioWorkspaceCapability; });

This will mean that wherever it you DI (dependancy inject) this class in your application, the same exact instance will be injected.

In your TwilioWorkspaceCapability class:

class TwilioWorkspaceCapability {

    /**
     * The twillio token
     * @var string
     */
    protected $token;


    /**
     * Get the current twilio token
     * @return string
     */
    public function getToken() {
        return $this->token;
    }

    ... and finally, in your handle method, replace the $token = ... line with:
    $this->token = $workspaceCapability->generateToken();
}

Then, in your route:

Route::get('/manage', ['middleware' => 'twilio.workspace.capability', function (Request $request, TwilioWorkspaceCapability $twilio) {
    return view('demo.manage', [
        'manage_link_class' => 'active',
        'token' => $twilio->getToken(),
    ]);
}]);

Macro Man · Accepted Answer · 2015-09-24 13:50:07Z

I believe the correct way to do this (in Laravel 5.x) is to add your custom fields to the attributes property.

From the source code comments, we can see attributes is used for custom parameters:

 /**
 * Custom parameters.
 *
 * @var \Symfony\Component\HttpFoundation\ParameterBag
 *
 * @api
 */
public $attributes;

So you would implement this as follows;

$request->attributes->add(['myAttribute' => 'myValue']);

I have changed this to the correct answer. Whilst Norman was right, this seems to adhere to Laravel's best practices. Thanks — Alex, Aug 26 '15 at 7:28
How do you then access the attributes within the receiving controller? — user985366, Feb 26 '16 at 9:00
Can't make it work - value is still empty. Laravel 5.3.4. Trying to use code in answer and @developernaren example :( — Gediminas, Feb 16 at 8:13

Vinicius · Answer 4 · 2015-11-07 13:50:49Z

In laravel >= 5 you can use $request->merge in the middleware:

public function handle($request, Closure $next)
{

    $request->merge(array("myVar" => "1234"));

    return $next($request);
}

And in the controller:

public function index(Request $request)
{

    $myVar = Request::instance()->query('myVar');
    ...
}

Community · Answer 5 · 2017-05-23 12:26:22Z

I am sure if it was possible to pass data from a middleware to a controller then it would be in the Laravel documentation.

Have a look at this and this, it might help.

In short, you can piggy back your data on the request object which is being passed to the middleware. The Laravel authentication facade does that too.

So, in your middleware, you can have:

$request->myAttribute = "myValue";

Thanks @norman - thats a good solution and i didn't know you could do it...! I was questioning if i should be using middleware at this point at all, but it seems i should. The documentation does not mention anything of the sort. Thanks again — Alex, May 13 '15 at 13:11
@Alex Yes, I think if its a common piece of code that executes in every controller action, it is not a bad idea to implement it as a middleware. — Noman Ur Rehman, May 13 '15 at 14:00

crishoj · Answer 6 · 2015-10-23 08:15:21Z

Instead of custom request parameters, you can follow the inversion-of-control pattern and use dependency injection.

In your middleware, register your Page instance:

app()->instance(Page::class, $page);

Then declare that your controller needs a Page instance:

class PagesController 
{
    protected $page;

    function __construct(Page $page) 
    {
        $this->page = $page;
    }
}

Laravel will automatically resolve the dependency and instantiate your controller with the Pageinstance that you bound in your middleware.

This is a really good idea, I went ahead and created a Service Provider then registered a Service Container. That way when needed some attributes, I would just inject the dependencies. Much cleaner and transparent. Thanks! — Arian Acosta, Oct 16 '16 at 19:58
@ArianAcosta Please, can you elaborate an answer with your way? I mean, how to use dependency injection and how it is associated with the middleware. — JCarlos, Apr 27 at 16:31
@JCarlos Sure! The idea would be to have a custom Service Container class that holds as internal properties the data that you need to pass around between the middleware and the controller. If you register that Service Container as a singleton with $this->app->singleton(...) then, it will always be the same instance every time you inject it. So, essentially you would first inject it in the middleware (by simply requiring it as an argument), then put the data inside of it, and finally require it in the controller where you can access the data. See laravel.com/docs/5.4/container good luck — Arian Acosta, Apr 28 at 21:37

Anand S Kumar · Answer 7 · 2015-08-18 10:04:51Z

i don't speak english, so... sorry for possible errors.

You can use the IoC binding for this. In your middleware you can do this for binding $page instance:

\App::instance('mi_page_var', $page);

After, in your controller you call that instance:

$page = \App::make('mi_page_var');

The App::instance not re-instance the class, instead return the instance previusly binding.

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You are here

laravel Pass parameters to Controller from middleware 将参数从 middleware 中间件传递给Controller 控制器

Laravel - Passing variables from Middleware to controller/route

2 Answers 正确答案

Laravel Middleware return variable to controller

5 Answers 正确答案

来自 https://stackoverflow.com/questions/30212390/laravel-middleware-return-variable-to-controller

友情链接