Laravel：使用Guzzle使用自定义Passport登录的解决方案

无需使用Guzzle或file_get_contents，从控制器功能内创建一个新的HTTP请求，并将其路由通过框架：

public function signin (Request $request) {

    // get an appropriate client for the auth flow
    $client = Client::where([
        'password_client' => true,
        'revoked'         => false
    ])->first();

    // make an internal request to the passport server
    $tokenRequest = Request::create('/oauth/token', 'post', [
            'grant_type'    => 'password',
            'client_id'     => $client->id,
            'client_secret' => $client->secret,
            'username'      => $request->input('email'),
            'password'      => $request->input('password')
    ]);

    // let the framework handle the request
    $response = app()->handle($tokenRequest);

    // get the token from the response if authenticated, other wise redirect to login
}