/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.ssl;

import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
import io.netty.handler.ssl.ApplicationProtocolConfig.SelectedListenerFailureBehavior;
import io.netty.handler.ssl.ApplicationProtocolConfig.SelectorFailureBehavior;
import io.netty.handler.ssl.JdkApplicationProtocolNegotiator.ProtocolSelector;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
import io.netty.handler.ssl.util.SelfSignedCertificate;
import java.security.Provider;
import java.util.ArrayList;
import java.util.Collection;

import io.netty.util.internal.EmptyArrays;
import io.netty.util.internal.PlatformDependent;
import org.junit.Ignore;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

import java.util.List;
import java.util.concurrent.TimeUnit;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLHandshakeException;

import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeNoException;

@RunWith(Parameterized.class)
public class JdkSslEngineTest extends SSLEngineTest {
    public enum ProviderType {
        NPN_JETTY {
            @Override
            boolean isAvailable() {
                return JettyNpnSslEngine.isAvailable();
            }

            @Override
            Protocol protocol() {
                return Protocol.NPN;
            }

            @Override
            Provider provider() {
                return null;
            }
        },
        ALPN_JETTY {
            @Override
            boolean isAvailable() {
                return JettyAlpnSslEngine.isAvailable();
            }

            @Override
            Protocol protocol() {
                return Protocol.ALPN;
            }

            @Override
            Provider provider() {
                // Use the default provider.
                return null;
            }
        },
        ALPN_JAVA9 {
            @Override
            boolean isAvailable() {
                return PlatformDependent.javaVersion() >= 9 && Java9SslUtils.supportsAlpn();
            }

            @Override
            Protocol protocol() {
                return Protocol.ALPN;
            }

            @Override
            Provider provider() {
                // Use the default provider.
                return null;
            }
        },
        ALPN_CONSCRYPT {
            private Provider provider;

            @Override
            boolean isAvailable() {
                return Conscrypt.isAvailable();
            }

            @Override
            Protocol protocol() {
                return Protocol.ALPN;
            }

            @Override
            Provider provider() {
                try {
                    if (provider == null) {
                        provider = (Provider) Class.forName("org.conscrypt.OpenSSLProvider")
                            .getConstructor().newInstance();
                    }
                    return provider;
                } catch (Exception e) {
                    throw new IllegalStateException(e);
                }
            }
        };

        abstract boolean isAvailable();
        abstract Protocol protocol();
        abstract Provider provider();

        final void activate(JdkSslEngineTest instance) {
            // Typical code will not have to check this, but will get a initialization error on class load.
            // Check in this test just in case we have multiple tests that just the class and we already ignored the
            // initialization error.
            if (!isAvailable()) {
                throw tlsExtensionNotFound(protocol());
            }
            instance.provider = provider();
        }
    }

    private static final String PREFERRED_APPLICATION_LEVEL_PROTOCOL = "my-protocol-http2";
    private static final String FALLBACK_APPLICATION_LEVEL_PROTOCOL = "my-protocol-http1_1";
    private static final String APPLICATION_LEVEL_PROTOCOL_NOT_COMPATIBLE = "my-protocol-FOO";

    @Parameterized.Parameters(name = "{index}: providerType = {0}, bufferType = {1}, combo = {2}, delegate = {3}")
    public static Collection<Object[]> data() {
        List<Object[]> params = new ArrayList<>();
        for (ProviderType providerType : ProviderType.values()) {
            for (BufferType bufferType : BufferType.values()) {
                params.add(new Object[]{ providerType, bufferType, ProtocolCipherCombo.tlsv12(), true });
                params.add(new Object[]{ providerType, bufferType, ProtocolCipherCombo.tlsv12(), false });

                if (PlatformDependent.javaVersion() >= 11) {
                    params.add(new Object[] { providerType, bufferType, ProtocolCipherCombo.tlsv13(), true });
                    params.add(new Object[] { providerType, bufferType, ProtocolCipherCombo.tlsv13(), false });
                }
            }
        }
        return params;
    }

    private final ProviderType providerType;

    private Provider provider;

    public JdkSslEngineTest(ProviderType providerType, BufferType bufferType,
                            ProtocolCipherCombo protocolCipherCombo, boolean delegate) {
        super(bufferType, protocolCipherCombo, delegate);
        this.providerType = providerType;
    }

    @Test
    public void testTlsExtension() throws Exception {
        try {
            providerType.activate(this);
            ApplicationProtocolConfig apn = failingNegotiator(providerType.protocol(),
                PREFERRED_APPLICATION_LEVEL_PROTOCOL);
            setupHandlers(apn);
            runTest();
        } catch (SkipTestException e) {
            // ALPN availability is dependent on the java version. If ALPN is not available because of
            // java version incompatibility don't fail the test, but instead just skip the test
            assumeNoException(e);
        }
    }

    @Test
    public void testTlsExtensionNoCompatibleProtocolsNoHandshakeFailure() throws Exception {
        try {
            providerType.activate(this);
            ApplicationProtocolConfig clientApn = acceptingNegotiator(providerType.protocol(),
                PREFERRED_APPLICATION_LEVEL_PROTOCOL);
            ApplicationProtocolConfig serverApn = acceptingNegotiator(providerType.protocol(),
                APPLICATION_LEVEL_PROTOCOL_NOT_COMPATIBLE);
            setupHandlers(serverApn, clientApn);
            runTest(null);
        } catch (SkipTestException e) {
            // ALPN availability is dependent on the java version. If ALPN is not available because of
            // java version incompatibility don't fail the test, but instead just skip the test
            assumeNoException(e);
        }
    }

    @Test
    public void testTlsExtensionNoCompatibleProtocolsClientHandshakeFailure() throws Exception {
        try {
            providerType.activate(this);
            if (providerType == ProviderType.NPN_JETTY) {
                ApplicationProtocolConfig clientApn = failingNegotiator(providerType.protocol(),
                    PREFERRED_APPLICATION_LEVEL_PROTOCOL);
                ApplicationProtocolConfig serverApn = acceptingNegotiator(providerType.protocol(),
                    APPLICATION_LEVEL_PROTOCOL_NOT_COMPATIBLE);
                setupHandlers(serverApn, clientApn);
                assertTrue(clientLatch.await(2, TimeUnit.SECONDS));
                assertTrue(clientException instanceof SSLHandshakeException);
            } else {
                // ALPN
                SelfSignedCertificate ssc = new SelfSignedCertificate();
                JdkApplicationProtocolNegotiator clientApn = new JdkAlpnApplicationProtocolNegotiator(true, true,
                    PREFERRED_APPLICATION_LEVEL_PROTOCOL);
                JdkApplicationProtocolNegotiator serverApn = new JdkAlpnApplicationProtocolNegotiator(
                        (engine, supportedProtocols) -> new ProtocolSelector() {
                            @Override
                            public void unsupported() {
                            }

                            @Override
                            public String select(List<String> protocols) {
                                return APPLICATION_LEVEL_PROTOCOL_NOT_COMPATIBLE;
                            }
                        }, JdkBaseApplicationProtocolNegotiator.FAIL_SELECTION_LISTENER_FACTORY,
                    APPLICATION_LEVEL_PROTOCOL_NOT_COMPATIBLE);

                SslContext serverSslCtx = new JdkSslServerContext(providerType.provider(),
                    ssc.certificate(), ssc.privateKey(), null, null,
                    IdentityCipherSuiteFilter.INSTANCE, serverApn, 0, 0);
                SslContext clientSslCtx = new JdkSslClientContext(providerType.provider(), null,
                    InsecureTrustManagerFactory.INSTANCE, null,
                    IdentityCipherSuiteFilter.INSTANCE, clientApn, 0, 0);

                setupHandlers(new TestDelegatingSslContext(serverSslCtx), new TestDelegatingSslContext(clientSslCtx));
                assertTrue(clientLatch.await(2, TimeUnit.SECONDS));
                // When using TLSv1.3 the handshake is NOT sent in an extra round trip which means there will be
                // no exception reported in this case but just the channel will be closed.
                assertTrue(clientException instanceof SSLHandshakeException || clientException == null);
            }
        } catch (SkipTestException e) {
            // ALPN availability is dependent on the java version. If ALPN is not available because of
            // java version incompatibility don't fail the test, but instead just skip the test
            assumeNoException(e);
        }
    }

    @Test
    public void testTlsExtensionNoCompatibleProtocolsServerHandshakeFailure() throws Exception {
        try {
            providerType.activate(this);
            ApplicationProtocolConfig clientApn = acceptingNegotiator(providerType.protocol(),
                PREFERRED_APPLICATION_LEVEL_PROTOCOL);
            ApplicationProtocolConfig serverApn = failingNegotiator(providerType.protocol(),
                APPLICATION_LEVEL_PROTOCOL_NOT_COMPATIBLE);
            setupHandlers(serverApn, clientApn);
            assertTrue(serverLatch.await(2, TimeUnit.SECONDS));
            assertTrue(serverException instanceof SSLHandshakeException);
        } catch (SkipTestException e) {
            // ALPN availability is dependent on the java version. If ALPN is not available because of
            // java version incompatibility don't fail the test, but instead just skip the test
            assumeNoException(e);
        }
    }

    @Test
    public void testAlpnCompatibleProtocolsDifferentClientOrder() throws Exception {
        try {
            providerType.activate(this);
            if (providerType == ProviderType.NPN_JETTY) {
                // This test only applies to ALPN.
                throw tlsExtensionNotFound(providerType.protocol());
            }
            // Even the preferred application protocol appears second in the client's list, it will be picked
            // because it's the first one on server's list.
            ApplicationProtocolConfig clientApn = acceptingNegotiator(Protocol.ALPN,
                FALLBACK_APPLICATION_LEVEL_PROTOCOL, PREFERRED_APPLICATION_LEVEL_PROTOCOL);
            ApplicationProtocolConfig serverApn = failingNegotiator(Protocol.ALPN,
                PREFERRED_APPLICATION_LEVEL_PROTOCOL, FALLBACK_APPLICATION_LEVEL_PROTOCOL);
            setupHandlers(serverApn, clientApn);
            assertNull(serverException);
            runTest(PREFERRED_APPLICATION_LEVEL_PROTOCOL);
        } catch (SkipTestException e) {
            // ALPN availability is dependent on the java version. If ALPN is not available because of
            // java version incompatibility don't fail the test, but instead just skip the test
            assumeNoException(e);
        }
    }

    @Test
    public void testEnablingAnAlreadyDisabledSslProtocol() throws Exception {
        testEnablingAnAlreadyDisabledSslProtocol(new String[]{}, new String[]{ SslUtils.PROTOCOL_TLS_V1_2 });
    }

    @Ignore /* Does the JDK support a "max certificate chain length"? */
    @Override
    public void testMutualAuthValidClientCertChainTooLongFailOptionalClientAuth() throws Exception {
    }

    @Ignore /* Does the JDK support a "max certificate chain length"? */
    @Override
    public void testMutualAuthValidClientCertChainTooLongFailRequireClientAuth() throws Exception {
    }

    @Override
    protected boolean mySetupMutualAuthServerIsValidException(Throwable cause) {
        // TODO(scott): work around for a JDK issue. The exception should be SSLHandshakeException.
        return super.mySetupMutualAuthServerIsValidException(cause) || causedBySSLException(cause);
    }

    private void runTest() throws Exception {
        runTest(PREFERRED_APPLICATION_LEVEL_PROTOCOL);
    }

    @Override
    protected SslProvider sslClientProvider() {
        return SslProvider.JDK;
    }

    @Override
    protected SslProvider sslServerProvider() {
        return SslProvider.JDK;
    }

    @Override
    protected Provider clientSslContextProvider() {
        return provider;
    }

    @Override
    protected Provider serverSslContextProvider() {
        return provider;
    }

    private static ApplicationProtocolConfig failingNegotiator(Protocol protocol, String... supportedProtocols) {
        return new ApplicationProtocolConfig(protocol,
                SelectorFailureBehavior.FATAL_ALERT,
                SelectedListenerFailureBehavior.FATAL_ALERT,
                supportedProtocols);
    }

    private static ApplicationProtocolConfig acceptingNegotiator(Protocol protocol, String... supportedProtocols) {
        return new ApplicationProtocolConfig(protocol,
                SelectorFailureBehavior.NO_ADVERTISE,
                SelectedListenerFailureBehavior.ACCEPT,
                supportedProtocols);
    }

    private static SkipTestException tlsExtensionNotFound(Protocol protocol) {
        throw new SkipTestException(protocol + " not on classpath");
    }

    private static final class SkipTestException extends RuntimeException {
        private static final long serialVersionUID = 9214869217774035223L;

        SkipTestException(String message) {
            super(message);
        }
    }

    private final class TestDelegatingSslContext extends DelegatingSslContext {
        TestDelegatingSslContext(SslContext ctx) {
            super(ctx);
        }

        @Override
        protected void initEngine(SSLEngine engine) {
            engine.setEnabledProtocols(protocols());
            engine.setEnabledCipherSuites(ciphers().toArray(EmptyArrays.EMPTY_STRINGS));
        }
    }
}
