Add authentication verifier implementation

Signed-off-by: Peter Nied <petern@amazon.com>

src/main/java/org/opensearch/security/dlic/rest/api/AbstractApiAction.java

@@ -543,7 +543,6 @@ protected final RestChannelConsumer prepareRequest(RestRequest request, NodeClie
         return channel -> {
             final SecurityRequestChannel securityRequest = SecurityRequestFactory.from(request, channel);
 
-
             // check if .opendistro_security index has been initialized
             if (!ensureIndexExists()) {
                 internalSeverError(channel, RequestContentValidator.ValidationError.SECURITY_NOT_INITIALIZED.message());

src/main/java/org/opensearch/security/filter/NettyRequest.java

@@ -0,0 +1,71 @@
+package org.opensearch.security.filter;
+
+import java.net.InetSocketAddress;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+import javax.net.ssl.SSLEngine;
+
+import org.opensearch.rest.RestRequest.Method;
+
+import io.netty.handler.codec.http.HttpRequest;
+
+/**
+ * Wraps the functionality of HttpRequest for use in the security plugin
+ */
+public class NettyRequest implements SecurityRequest {
+    protected final HttpRequest underlyingRequest;
+
+    NettyRequest(final HttpRequest request) {
+        this.underlyingRequest = request;
+    }
+
+    @Override
+    public Map<String, List<String>> getHeaders() {
+        final Map<String, List<String>> headers = new HashMap<>();
+        underlyingRequest.headers().forEach(h -> headers.put(h.getKey(), List.of(h.getValue())));
+        return headers;
+    }
+
+    @Override
+    public SSLEngine getSSLEngine() {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'getSSLEngine'");
+    }
+
+    @Override
+    public String path() {
+        try {
+            return new URL(underlyingRequest.uri()).getPath();
+        } catch (final MalformedURLException e) {
+            return "";
+        }
+    }
+
+    @Override
+    public Method method() {
+        return Method.valueOf(underlyingRequest.method().name());
+    }
+
+    @Override
+    public Optional<InetSocketAddress> getRemoteAddress() {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'getRemoteAddress'");
+    }
+
+    @Override
+    public String uri() {
+        return underlyingRequest.uri();
+    }
+
+    @Override
+    public Map<String, String> params() {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'params'");
+    }
+
+}

src/main/java/org/opensearch/security/filter/NettyRequestChannel.java

@@ -0,0 +1,36 @@
+package org.opensearch.security.filter;
+
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicReference;
+
+import org.apache.commons.lang3.tuple.Triple;
+import io.netty.handler.codec.http.HttpRequest;
+
+public class NettyRequestChannel extends NettyRequest implements SecurityRequestChannel {
+
+    private final AtomicReference<Triple<Integer, Map<String, String>, String>> completedResult = new AtomicReference<>(); 
+    NettyRequestChannel(final HttpRequest request) {
+        super(request);
+    }
+
+    @Override
+    public boolean hasCompleted() {
+        return completedResult.get() != null;
+    }
+
+    @Override
+    public boolean completeWithResponse(int statusCode, Map<String, String> headers, String body) {
+        if (hasCompleted()) {
+            throw new UnsupportedOperationException("This channel has already completed");
+        }
+
+        completedResult.set(Triple.of(statusCode, headers, body));
+
+        return true;
+    }
+
+    /** Accessor to get the completed response */
+    public Triple<Integer, Map<String, String>, String> getCompletedRequest() {
+        return completedResult.get();
+    }
+}

src/main/java/org/opensearch/security/filter/SecurityRequestFactory.java

@@ -3,6 +3,8 @@
 import org.opensearch.rest.RestChannel;
 import org.opensearch.rest.RestRequest;
 
+import io.netty.handler.codec.http.HttpRequest;
+
 /**
  * Generates wrapped versions of requests for use in the security plugin
  */
@@ -17,4 +19,9 @@ public static SecurityRequest from(final RestRequest request) {
     public static SecurityRequestChannel from(final RestRequest request, final RestChannel channel) {
         return new OpenSearchRequestChannel(request, channel);
     }
+
+    /** Creates a security request from a netty HttpRequest object */
+    public static SecurityRequestChannel from(HttpRequest request) {
+        return new NettyRequestChannel(request);
+    }
 }

src/main/java/org/opensearch/security/http/AuthenicationVerifier.java

@@ -0,0 +1,69 @@
+package org.opensearch.security.http;
+
+import java.util.Optional;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.opensearch.security.filter.NettyRequestChannel;
+import org.opensearch.security.filter.SecurityRequestChannel;
+import org.opensearch.security.filter.SecurityRequestFactory;
+import org.opensearch.security.filter.SecurityRestFilter;
+
+import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.handler.codec.http.HttpRequest;
+import io.netty.handler.codec.http.DefaultFullHttpResponse;
+import io.netty.handler.codec.http.FullHttpRequest;
+import io.netty.handler.codec.http.FullHttpResponse;
+import io.netty.handler.codec.http.HttpResponseStatus;
+import io.netty.handler.codec.http.HttpVersion;
+import io.netty.util.ReferenceCountUtil;
+
+public class AuthenticationVerifer extends ChannelInboundHandlerAdapter {
+
+    final static Logger log = LogManager.getLogger(AuthenticationVerifer.class);
+
+    private SecurityRestFilter restFilter;
+
+    public AuthenticationVerifer(SecurityRestFilter restFilter) {
+        this.restFilter = restFilter;
+    }
+
+    @Override
+    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+        if (!(msg instanceof HttpRequest)) {
+            ctx.fireChannelRead(msg);
+        }
+
+        final HttpRequest request = (HttpRequest) msg;
+        final Optional<FullHttpResponse> shouldResponse = getAuthenticationResponse(request);
+        if (shouldResponse.isPresent()) {
+            ctx.writeAndFlush(shouldResponse.get()).addListener(ChannelFutureListener.CLOSE);
+        } else {
+            // Let the request pass to the next channel handler
+            ctx.fireChannelRead(msg);
+        }
+    }
+
+    private Optional<FullHttpResponse> getAuthenticationResponse(HttpRequest request) {
+
+        log.info("Checking if request is authenticated:\n" + request);
+
+        final NettyRequestChannel requestChannel = (NettyRequestChannel) SecurityRequestFactory.from(request);
+        restFilter.checkAndAuthenticateRequest(requestChannel);
+
+        if (requestChannel.hasCompleted()) {
+            final FullHttpResponse response = new DefaultFullHttpResponse(
+                    request.protocolVersion(),
+                    HttpResponseStatus.valueOf(requestChannel.getCompletedRequest().getLeft()),
+                    Unpooled.copiedBuffer(requestChannel.getCompletedRequest().getRight().getBytes()));
+            requestChannel.getCompletedRequest().getMiddle().forEach((key, value) -> response.headers().set(key, value));
+            return Optional.of(response);
+        }
+
+        return Optional.empty();
+    }
+
+}

src/main/java/org/opensearch/security/http/AuthenticationVerifer.java

@@ -0,0 +1,74 @@
+package org.opensearch.security.http;
+
+import java.util.Optional;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.opensearch.security.filter.NettyRequestChannel;
+import org.opensearch.security.filter.SecurityRequestChannel;
+import org.opensearch.security.filter.SecurityRequestFactory;
+import org.opensearch.security.filter.SecurityRestFilter;
+
+import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.handler.codec.http.HttpRequest;
+import io.netty.handler.codec.http.DefaultFullHttpResponse;
+import io.netty.handler.codec.http.FullHttpRequest;
+import io.netty.handler.codec.http.FullHttpResponse;
+import io.netty.handler.codec.http.HttpResponseStatus;
+import io.netty.handler.codec.http.HttpVersion;
+import io.netty.util.ReferenceCountUtil;
+
+public class AuthenticationVerifer extends ChannelInboundHandlerAdapter {
+
+    final static Logger log = LogManager.getLogger(AuthenticationVerifer.class);
+
+    private SecurityRestFilter restFilter;
+
+    public AuthenticationVerifer(SecurityRestFilter restFilter) {
+        this.restFilter = restFilter;
+    }
+
+    @Override
+    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+        if (!(msg instanceof HttpRequest)) {
+            ctx.fireChannelRead(msg);
+        }
+
+        final HttpRequest request = (HttpRequest) msg;
+        final Optional<FullHttpResponse> shouldResponse = getAuthenticationResponse(request);
+        if (shouldResponse.isPresent()) {
+            ctx.writeAndFlush(shouldResponse.get()).addListener(ChannelFutureListener.CLOSE);
+        } else {
+            // Let the request pass to the next channel handler
+            ctx.fireChannelRead(msg);
+        }
+    }
+
+    private Optional<FullHttpResponse> getAuthenticationResponse(HttpRequest request) {
+
+        log.info("Checking if request is authenticated:\n" + request);
+
+        final NettyRequestChannel requestChannel = (NettyRequestChannel) SecurityRequestFactory.from(request);
+
+        try {
+            restFilter.checkAndAuthenticateRequest(requestChannel);
+        } catch (Exception e) {
+            log.error(e);
+        }
+
+        if (requestChannel.hasCompleted()) {
+            final FullHttpResponse response = new DefaultFullHttpResponse(
+                    request.protocolVersion(),
+                    HttpResponseStatus.valueOf(requestChannel.getCompletedRequest().getLeft()),
+                    Unpooled.copiedBuffer(requestChannel.getCompletedRequest().getRight().getBytes()));
+            requestChannel.getCompletedRequest().getMiddle().forEach((key, value) -> response.headers().set(key, value));
+            return Optional.of(response);
+        }
+
+        return Optional.empty();
+    }
+
+}