How can i add TrimString Middleware in laravel 5.3?

Just came to know that Laravel 5.4 has an awesome feature TrimString, which removes the white spaces from any input. I want this middleware in my 5.3 project, any idea how to do that?

I just copied the middleware from GitHub repo of Laravel but it is not working.

Thanks

Solution

If you want to use this feature in Laravel 5.3.

Add these two classes into your App\Http\Middleware

https://github.com/laravel/framework/blob/5.4/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php

https://github.com/laravel/laravel/blob/master/app/Http/Middleware/TrimStrings.php

Updating it's namespace to App\Http\middleware. Like:

TransformsRequest.php

namespace App\Http\Middleware;

use Closure;
use Symfony\Component\HttpFoundation\ParameterBag;

class TransformsRequest
{
    /**
     * The additional attributes passed to the middleware.
     *
     * @var array
     */
    protected $attributes = [];

    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next, ...$attributes)
    {
        $this->attributes = $attributes;

        $this->clean($request);

        return $next($request);
    }

    /**
     * Clean the request's data.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return void
     */
    protected function clean($request)
    {
        $this->cleanParameterBag($request->query);

        $this->cleanParameterBag($request->request);

        if ($request->isJson()) {
            $this->cleanParameterBag($request->json());
        }
    }

    /**
     * Clean the data in the parameter bag.
     *
     * @param  \Symfony\Component\HttpFoundation\ParameterBag  $bag
     * @return void
     */
    protected function cleanParameterBag(ParameterBag $bag)
    {
        $bag->replace($this->cleanArray($bag->all()));
    }

    /**
     * Clean the data in the given array.
     *
     * @param  array  $data
     * @return array
     */
    protected function cleanArray(array $data)
    {
        return collect($data)->map(function ($value, $key) {
            return $this->cleanValue($key, $value);
        })->all();
    }

    /**
     * Clean the given value.
     *
     * @param  string  $key
     * @param  mixed  $value
     * @return mixed
     */
    protected function cleanValue($key, $value)
    {
        if (is_array($value)) {
            return $this->cleanArray($value);
        }

        return $this->transform($key, $value);
    }

    /**
     * Transform the given value.
     *
     * @param  string  $key
     * @param  mixed  $value
     * @return mixed
     */
    protected function transform($key, $value)
    {
        return $value;
    }
}

TrimStrings.php

namespace App\Http\Middleware;

class TrimStrings extends TransformsRequest
{
    /**
     * The attributes that should not be trimmed.
     *
     * @var array
     */
    protected $except = [
        //
    ];

    /**
     * Transform the given value.
     *
     * @param  string  $key
     * @param  mixed  $value
     * @return mixed
     */
    protected function transform($key, $value)
    {
        if (in_array($key, $this->except)) {
            return $value;
        }

        return is_string($value) ? trim($value) : $value;
    }
}

And add into your App\Http\Kernel.php

protected $middleware = [
    \Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode::class,
    \App\Http\Middleware\TransformsRequest::class,
    \App\Http\Middleware\TrimStrings::class,
];

To use it just use:

dd(request('email'));