<?php
/**
 * 后台认证中间件.
 *
 * @author nj
 * @date   2019-11-03 14:07:35
 */

namespace Modules\AgentApi\Middlewares;

use App\Constants\ErrorCodeConstant;
use Closure;
use App\Repositories\Utils\AccessControllerListsRepository;
use App\Repositories\Utils\JwtRepository;
use Modules\AgentApi\Services\AgentAuthService;
use Cache;

class AgentAuthMiddleware
{
    protected $except = [];   //URI里排除的操作

    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        if ($this->shouldPassThrough($request)) {
            return $next($request);
        }
        /**
         * @var AgentAuthService $authService
         */
        $authService = app(AgentAuthService::class);
        $token = $authService->getHeaderToken();
        if (empty($token)) {
            return json_fail(trans('common.err_failed_authorization'), 403);
        }
        /**
         * @var JwtRepository $jwtRepo
         */
        $jwtRepo = make(JwtRepository::class);
        $aud = 'agent-users';
        $validateResult = $jwtRepo->validateToken($token, $aud);
        if (!$validateResult['is_valid']) {
            return json_fail(trans('common.err_failed_authorization'), 403);
        } else {
            if ($validateResult['is_expired']) {
                return json_fail('认证过期', 401);
            }
            // 验证单点.
            $claim = $validateResult['token_obj']->claims();
            $tokenAgentUid = $claim->get('agent_uid');
            $tokenIp = $claim->get('ip');
            $clientIp = $jwtRepo->getClientIp();
            $cacheKey = $authService->getAgentCacheKey($tokenAgentUid);
            /**
             * @var Cache $cache
             */
            $cache = make('cache');
            $cacheToken = $cache->has($cacheKey) ? $cache->get($cacheKey) : '';
            if (empty($cacheToken) || $cacheToken !== $token) {
                return json_fail(trans('common.err_failed_authorization'), 403);
            }
            if (empty($tokenIp) || empty($clientIp) || $tokenIp !== $clientIp) {
                return json_fail(trans('common.err_failed_authorization'), 403);
            }
        }

        return $next($request);
    }

    private function getExcepts()
    {
        $uriPrefix = env('AGENT_API_URI_PREFIX', 'agent_api');
        $this->except = [
            $uriPrefix . '/ping',
            $uriPrefix .'/auth/login',
            $uriPrefix . '/auth/refresh/token',
            $uriPrefix . '/auth/logout',
            $uriPrefix . '/chunqiu/captcha',
        ];

        return $this->except;
    }

    /**
     * Determine if the request has a URI that should pass through CSRF verification.
     *
     * @param  \Illuminate\Http\Request $request
     * @return bool
     */
    protected function shouldPassThrough($request)
    {
        foreach ($this->getExcepts() as $except) {
            if ($except !== '/') {
                $except = trim($except, '/');
            }

            if ($request->is($except)) {
                return true;
            }
        }

        return false;
    }
}