如何在Laravel 5.4中将我的LDAP连接到现有的ldap系统

'providers' => [
    'users' => [
        'driver' => 'ldap',
        'model' => App\User::class,
        'connection' => 'ldap',
    ],
],

'connections' => [
    'ldap' => [
        'driver' => 'adldap',
        'model' => App\User::class,
        'rules' => [
            Adldap\Laravel\Validation\Rules\DenyTrashed::class,
        ],
        'identifiers' => [
            'ldap' => Adldap\Laravel\Auth\NoDatabaseUserProvider::class,
        ],
        'database' => [
            'model' => App\User::class,
            'sync_passwords' => false,
            'sync_attributes' => [],
        ],
    ],
],

'connections' => [
    'default' => [
        'auto_connect' => env('LDAP_AUTO_CONNECT', true),
        'connection' => Adldap\Connections\Ldap::class,
        'schema' => Adldap\Schemas\ActiveDirectory::class,
        'connection_settings' => [
            'account_prefix' => env('LDAP_ACCOUNT_PREFIX', ''),
            'account_suffix' => env('LDAP_ACCOUNT_SUFFIX', ''),
            'domain_controllers' => explode(' ', env('LDAP_DOMAIN_CONTROLLERS', 'ldap.example.com')),
            'port' => env('LDAP_PORT', 389),
            'timeout' => env('LDAP_TIMEOUT', 5),
            'base_dn' => env('LDAP_BASE_DN', 'dc=example,dc=com'),
            'username' => env('LDAP_USERNAME', 'admin'),
            'password' => env('LDAP_PASSWORD', 'password'),
        ],
    ],
],

LDAP_AUTO_CONNECT=true
LDAP_ACCOUNT_PREFIX=
LDAP_ACCOUNT_SUFFIX=
LDAP_DOMAIN_CONTROLLERS=ldap.example.com
LDAP_PORT=389
LDAP_TIMEOUT=5
LDAP_BASE_DN=dc=example,dc=com
LDAP_USERNAME=admin
LDAP_PASSWORD=password

namespace App;

use Adldap\Laravel\Traits\HasLdapUser;
use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    use HasLdapUser;

    // ...
}

public function login(Request $request)
{
    $credentials = $request->only('email', 'password');

    if (Auth::attempt($credentials)) {
        // 认证成功
        return redirect()->intended('dashboard');
    } else {
        // 认证失败
        return redirect()->back()->withErrors(['email' => '认证失败']);
    }
}