class ReverseProxyMiddlewareTest

class ReverseProxyMiddlewareTest extends UnitTestCase {
    
    /**
     * @var \Symfony\Component\HttpKernel\HttpKernelInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $mockHttpKernel;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $responseMock = $this->createMock(Response::class);
        $this->mockHttpKernel = $this->createMock(HttpKernelInterface::class);
        $this->mockHttpKernel
            ->method('handle')
            ->willReturn($responseMock);
    }
    
    /**
     * Tests that subscriber does not act when reverse proxy is not set.
     */
    public function testNoProxy() : void {
        $settings = new Settings([]);
        $this->assertEquals(0, $settings->get('reverse_proxy'));
        $middleware = new ReverseProxyMiddleware($this->mockHttpKernel, $settings);
        // Mock a request object.
        $request = $this->getMockBuilder('Symfony\\Component\\HttpFoundation\\Request')
            ->onlyMethods([
            'setTrustedProxies',
        ])
            ->getMock();
        // setTrustedProxies() should never fire.
        $request->expects($this->never())
            ->method('setTrustedProxies');
        // Actually call the check method.
        $middleware->handle($request);
    }
    
    /**
     * Tests that subscriber sets trusted headers when reverse proxy is set.
     *
     * @dataProvider reverseProxyEnabledProvider
     */
    public function testReverseProxyEnabled($provided_settings, $expected_trusted_header_set) : void {
        // Enable reverse proxy and add test values.
        $settings = new Settings([
            'reverse_proxy' => 1,
        ] + $provided_settings);
        $this->trustedHeadersAreSet($settings, $expected_trusted_header_set);
    }
    
    /**
     * Data provider for testReverseProxyEnabled.
     */
    public static function reverseProxyEnabledProvider() {
        return [
            'Proxy with default trusted headers' => [
                [
                    'reverse_proxy_addresses' => [
                        '127.0.0.2',
                        '127.0.0.3',
                    ],
                ],
                Request::HEADER_FORWARDED | Request::HEADER_X_FORWARDED_FOR | Request::HEADER_X_FORWARDED_HOST | Request::HEADER_X_FORWARDED_PORT | Request::HEADER_X_FORWARDED_PROTO,
            ],
            'Proxy with AWS trusted headers' => [
                [
                    'reverse_proxy_addresses' => [
                        '127.0.0.2',
                        '127.0.0.3',
                    ],
                    'reverse_proxy_trusted_headers' => Request::HEADER_X_FORWARDED_AWS_ELB,
                ],
                Request::HEADER_X_FORWARDED_AWS_ELB,
            ],
            'Proxy with custom trusted headers' => [
                [
                    'reverse_proxy_addresses' => [
                        '127.0.0.2',
                        '127.0.0.3',
                    ],
                    'reverse_proxy_trusted_headers' => Request::HEADER_X_FORWARDED_FOR | Request::HEADER_X_FORWARDED_HOST,
                ],
                Request::HEADER_X_FORWARDED_FOR | Request::HEADER_X_FORWARDED_HOST,
            ],
        ];
    }
    
    /**
     * Tests that trusted headers are set correctly.
     *
     * \Symfony\Component\HttpFoundation\Request::setTrustedProxies() should
     * always be called when reverse proxy settings are enabled.
     *
     * @param \Drupal\Core\Site\Settings $settings
     *   The settings object that holds reverse proxy configuration.
     * @param int $expected_trusted_header_set
     *   The expected bit value returned by
     *   \Symfony\Component\HttpFoundation\Request::getTrustedHeaderSet()
     */
    protected function trustedHeadersAreSet(Settings $settings, $expected_trusted_header_set) : void {
        $middleware = new ReverseProxyMiddleware($this->mockHttpKernel, $settings);
        $request = new Request();
        $middleware->handle($request);
        $this->assertSame($settings->get('reverse_proxy_addresses'), $request->getTrustedProxies());
        $this->assertSame($expected_trusted_header_set, $request->getTrustedHeaderSet());
    }

}