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File:/home/emberdemos/www/greg/dk-payroll/vendor/fideloper/proxy/src/TrustProxies.php

<?php

namespace Fideloper\Proxy;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Contracts\Config\Repository;

class TrustProxies
{
    /**
     * The config repository instance.
     *
     * @var \Illuminate\Contracts\Config\Repository
     */
    protected $config;

    /**
     * The trusted proxies for the application.
     *
     * @var null|string|array
     */
    protected $proxies;

    /**
     * The proxy header mappings.
     *
     * @var null|string|int
     */
    protected $headers;

    /**
     * Create a new trusted proxies middleware instance.
     *
     * @param \Illuminate\Contracts\Config\Repository $config
     */
    public function __construct(Repository $config)
    {
        $this->config = $config;
    }

    /**
     * Handle an incoming request.
     *
     * @param \Illuminate\Http\Request $request
     * @param \Closure                 $next
     *
     * @throws \Symfony\Component\HttpKernel\Exception\HttpException
     *
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        $request::setTrustedProxies([], $this->getTrustedHeaderNames()); // Reset trusted proxies between requests
        $this->setTrustedProxyIpAddresses($request);

        return $next($request);
    }

    /**
     * Sets the trusted proxies on the request to the value of trustedproxy.proxies
     *
     * @param \Illuminate\Http\Request $request
     */
    protected function setTrustedProxyIpAddresses(Request $request)
    {
        $trustedIps = $this->proxies ?: $this->config->get('trustedproxy.proxies');

        // Trust any IP address that calls us
        // `**` for backwards compatibility, but is deprecated
        if ($trustedIps === '*' || $trustedIps === '**') {
            return $this->setTrustedProxyIpAddressesToTheCallingIp($request);
        }

        // Support IPs addresses separated by comma
        $trustedIps = is_string($trustedIps) ? array_map('trim', explode(',', $trustedIps)) : $trustedIps;

        // Only trust specific IP addresses
        if (is_array($trustedIps)) {
            return $this->setTrustedProxyIpAddressesToSpecificIps($request, $trustedIps);
        }
    }

    /**
     * Specify the IP addresses to trust explicitly.
     *
     * @param \Illuminate\Http\Request $request
     * @param array                    $trustedIps
     */
    private function setTrustedProxyIpAddressesToSpecificIps(Request $request, $trustedIps)
    {
        $request->setTrustedProxies((array) $trustedIps, $this->getTrustedHeaderNames());
    }

    /**
     * Set the trusted proxy to be the IP address calling this servers
     *
     * @param \Illuminate\Http\Request $request
     */
    private function setTrustedProxyIpAddressesToTheCallingIp(Request $request)
    {
        $request->setTrustedProxies([$request->server->get('REMOTE_ADDR')], $this->getTrustedHeaderNames());
    }

    /**
     * Retrieve trusted header name(s), falling back to defaults if config not set.
     *
     * @return int A bit field of Request::HEADER_*, to set which headers to trust from your proxies.
     */
    protected function getTrustedHeaderNames()
    {
        $headers = $this->headers ?: $this->config->get('trustedproxy.headers');
        switch ($headers) {
            case 'HEADER_X_FORWARDED_AWS_ELB':
            case Request::HEADER_X_FORWARDED_AWS_ELB:
                return Request::HEADER_X_FORWARDED_AWS_ELB;
                break;
            case 'HEADER_FORWARDED':
            case Request::HEADER_FORWARDED:
                return Request::HEADER_FORWARDED;
                break;
            case 'HEADER_X_FORWARDED_FOR':
            case Request::HEADER_X_FORWARDED_FOR:
                return Request::HEADER_X_FORWARDED_FOR;
                break;
            case 'HEADER_X_FORWARDED_HOST':
            case Request::HEADER_X_FORWARDED_HOST:
                return Request::HEADER_X_FORWARDED_HOST;
                break;
            case 'HEADER_X_FORWARDED_PORT':
            case Request::HEADER_X_FORWARDED_PORT:
                return Request::HEADER_X_FORWARDED_PORT;
                break;
            case 'HEADER_X_FORWARDED_PROTO':
            case Request::HEADER_X_FORWARDED_PROTO:
                return Request::HEADER_X_FORWARDED_PROTO;
                break;
            default:
                return Request::HEADER_X_FORWARDED_FOR | Request::HEADER_X_FORWARDED_HOST | Request::HEADER_X_FORWARDED_PORT | Request::HEADER_X_FORWARDED_PROTO | Request::HEADER_X_FORWARDED_AWS_ELB;
        }

        return $headers;
    }
}

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