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    <h3>Editing: RequestGuard.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

namespace Illuminate\Auth;

use Illuminate\Contracts\Auth\Guard;
use Illuminate\Contracts\Auth\UserProvider;
use Illuminate\Http\Request;
use Illuminate\Support\Traits\Macroable;

class RequestGuard implements Guard
{
    use GuardHelpers, Macroable;

    /**
     * The guard callback.
     *
     * @var callable
     */
    protected $callback;

    /**
     * The request instance.
     *
     * @var \Illuminate\Http\Request
     */
    protected $request;

    /**
     * Create a new authentication guard.
     *
     * @param  callable  $callback
     * @param  \Illuminate\Http\Request  $request
     * @param  \Illuminate\Contracts\Auth\UserProvider|null  $provider
     * @return void
     */
    public function __construct(callable $callback, Request $request, UserProvider $provider = null)
    {
        $this-&gt;request = $request;
        $this-&gt;callback = $callback;
        $this-&gt;provider = $provider;
    }

    /**
     * Get the currently authenticated user.
     *
     * @return \Illuminate\Contracts\Auth\Authenticatable|null
     */
    public function user()
    {
        // If we've already retrieved the user for the current request we can just
        // return it back immediately. We do not want to fetch the user data on
        // every call to this method because that would be tremendously slow.
        if (! is_null($this-&gt;user)) {
            return $this-&gt;user;
        }

        return $this-&gt;user = call_user_func(
            $this-&gt;callback, $this-&gt;request, $this-&gt;getProvider()
        );
    }

    /**
     * Validate a user's credentials.
     *
     * @param  array  $credentials
     * @return bool
     */
    public function validate(array $credentials = [])
    {
        return ! is_null((new static(
            $this-&gt;callback, $credentials['request'], $this-&gt;getProvider()
        ))-&gt;user());
    }

    /**
     * Set the current request instance.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return $this
     */
    public function setRequest(Request $request)
    {
        $this-&gt;request = $request;

        return $this;
    }
}
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