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

namespace Illuminate\Auth;

use Closure;
use Illuminate\Contracts\Auth\Factory as FactoryContract;
use InvalidArgumentException;

class AuthManager implements FactoryContract
{
    use CreatesUserProviders;

    /**
     * The application instance.
     *
     * @var \Illuminate\Contracts\Foundation\Application
     */
    protected $app;

    /**
     * The registered custom driver creators.
     *
     * @var array
     */
    protected $customCreators = [];

    /**
     * The array of created &quot;drivers&quot;.
     *
     * @var array
     */
    protected $guards = [];

    /**
     * The user resolver shared by various services.
     *
     * Determines the default user for Gate, Request, and the Authenticatable contract.
     *
     * @var \Closure
     */
    protected $userResolver;

    /**
     * Create a new Auth manager instance.
     *
     * @param  \Illuminate\Contracts\Foundation\Application  $app
     * @return void
     */
    public function __construct($app)
    {
        $this-&gt;app = $app;

        $this-&gt;userResolver = function ($guard = null) {
            return $this-&gt;guard($guard)-&gt;user();
        };
    }

    /**
     * Attempt to get the guard from the local cache.
     *
     * @param  string|null  $name
     * @return \Illuminate\Contracts\Auth\Guard|\Illuminate\Contracts\Auth\StatefulGuard
     */
    public function guard($name = null)
    {
        $name = $name ?: $this-&gt;getDefaultDriver();

        return $this-&gt;guards[$name] ?? $this-&gt;guards[$name] = $this-&gt;resolve($name);
    }

    /**
     * Resolve the given guard.
     *
     * @param  string  $name
     * @return \Illuminate\Contracts\Auth\Guard|\Illuminate\Contracts\Auth\StatefulGuard
     *
     * @throws \InvalidArgumentException
     */
    protected function resolve($name)
    {
        $config = $this-&gt;getConfig($name);

        if (is_null($config)) {
            throw new InvalidArgumentException(&quot;Auth guard [{$name}] is not defined.&quot;);
        }

        if (isset($this-&gt;customCreators[$config['driver']])) {
            return $this-&gt;callCustomCreator($name, $config);
        }

        $driverMethod = 'create'.ucfirst($config['driver']).'Driver';

        if (method_exists($this, $driverMethod)) {
            return $this-&gt;{$driverMethod}($name, $config);
        }

        throw new InvalidArgumentException(
            &quot;Auth driver [{$config['driver']}] for guard [{$name}] is not defined.&quot;
        );
    }

    /**
     * Call a custom driver creator.
     *
     * @param  string  $name
     * @param  array  $config
     * @return mixed
     */
    protected function callCustomCreator($name, array $config)
    {
        return $this-&gt;customCreators[$config['driver']]($this-&gt;app, $name, $config);
    }

    /**
     * Create a session based authentication guard.
     *
     * @param  string  $name
     * @param  array  $config
     * @return \Illuminate\Auth\SessionGuard
     */
    public function createSessionDriver($name, $config)
    {
        $provider = $this-&gt;createUserProvider($config['provider'] ?? null);

        $guard = new SessionGuard(
            $name,
            $provider,
            $this-&gt;app['session.store'],
        );

        // When using the remember me functionality of the authentication services we
        // will need to be set the encryption instance of the guard, which allows
        // secure, encrypted cookie values to get generated for those cookies.
        if (method_exists($guard, 'setCookieJar')) {
            $guard-&gt;setCookieJar($this-&gt;app['cookie']);
        }

        if (method_exists($guard, 'setDispatcher')) {
            $guard-&gt;setDispatcher($this-&gt;app['events']);
        }

        if (method_exists($guard, 'setRequest')) {
            $guard-&gt;setRequest($this-&gt;app-&gt;refresh('request', $guard, 'setRequest'));
        }

        if (isset($config['remember'])) {
            $guard-&gt;setRememberDuration($config['remember']);
        }

        return $guard;
    }

    /**
     * Create a token based authentication guard.
     *
     * @param  string  $name
     * @param  array  $config
     * @return \Illuminate\Auth\TokenGuard
     */
    public function createTokenDriver($name, $config)
    {
        // The token guard implements a basic API token based guard implementation
        // that takes an API token field from the request and matches it to the
        // user in the database or another persistence layer where users are.
        $guard = new TokenGuard(
            $this-&gt;createUserProvider($config['provider'] ?? null),
            $this-&gt;app['request'],
            $config['input_key'] ?? 'api_token',
            $config['storage_key'] ?? 'api_token',
            $config['hash'] ?? false
        );

        $this-&gt;app-&gt;refresh('request', $guard, 'setRequest');

        return $guard;
    }

    /**
     * Get the guard configuration.
     *
     * @param  string  $name
     * @return array
     */
    protected function getConfig($name)
    {
        return $this-&gt;app['config'][&quot;auth.guards.{$name}&quot;];
    }

    /**
     * Get the default authentication driver name.
     *
     * @return string
     */
    public function getDefaultDriver()
    {
        return $this-&gt;app['config']['auth.defaults.guard'];
    }

    /**
     * Set the default guard driver the factory should serve.
     *
     * @param  string  $name
     * @return void
     */
    public function shouldUse($name)
    {
        $name = $name ?: $this-&gt;getDefaultDriver();

        $this-&gt;setDefaultDriver($name);

        $this-&gt;userResolver = function ($name = null) {
            return $this-&gt;guard($name)-&gt;user();
        };
    }

    /**
     * Set the default authentication driver name.
     *
     * @param  string  $name
     * @return void
     */
    public function setDefaultDriver($name)
    {
        $this-&gt;app['config']['auth.defaults.guard'] = $name;
    }

    /**
     * Register a new callback based request guard.
     *
     * @param  string  $driver
     * @param  callable  $callback
     * @return $this
     */
    public function viaRequest($driver, callable $callback)
    {
        return $this-&gt;extend($driver, function () use ($callback) {
            $guard = new RequestGuard($callback, $this-&gt;app['request'], $this-&gt;createUserProvider());

            $this-&gt;app-&gt;refresh('request', $guard, 'setRequest');

            return $guard;
        });
    }

    /**
     * Get the user resolver callback.
     *
     * @return \Closure
     */
    public function userResolver()
    {
        return $this-&gt;userResolver;
    }

    /**
     * Set the callback to be used to resolve users.
     *
     * @param  \Closure  $userResolver
     * @return $this
     */
    public function resolveUsersUsing(Closure $userResolver)
    {
        $this-&gt;userResolver = $userResolver;

        return $this;
    }

    /**
     * Register a custom driver creator Closure.
     *
     * @param  string  $driver
     * @param  \Closure  $callback
     * @return $this
     */
    public function extend($driver, Closure $callback)
    {
        $this-&gt;customCreators[$driver] = $callback;

        return $this;
    }

    /**
     * Register a custom provider creator Closure.
     *
     * @param  string  $name
     * @param  \Closure  $callback
     * @return $this
     */
    public function provider($name, Closure $callback)
    {
        $this-&gt;customProviderCreators[$name] = $callback;

        return $this;
    }

    /**
     * Determines if any guards have already been resolved.
     *
     * @return bool
     */
    public function hasResolvedGuards()
    {
        return count($this-&gt;guards) &gt; 0;
    }

    /**
     * Forget all of the resolved guard instances.
     *
     * @return $this
     */
    public function forgetGuards()
    {
        $this-&gt;guards = [];

        return $this;
    }

    /**
     * Set the application instance used by the manager.
     *
     * @param  \Illuminate\Contracts\Foundation\Application  $app
     * @return $this
     */
    public function setApplication($app)
    {
        $this-&gt;app = $app;

        return $this;
    }

    /**
     * Dynamically call the default driver instance.
     *
     * @param  string  $method
     * @param  array  $parameters
     * @return mixed
     */
    public function __call($method, $parameters)
    {
        return $this-&gt;guard()-&gt;{$method}(...$parameters);
    }
}
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