org.deephacks.vertxrs.VertxHttpResponse.java Source code

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Here is the source code for org.deephacks.vertxrs.VertxHttpResponse.java

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/**
 * Licensed 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 org.deephacks.vertxrs;

import io.netty.buffer.ByteBufOutputStream;
import io.netty.buffer.Unpooled;
import io.netty.handler.codec.http.HttpHeaders.Values;
import io.netty.handler.codec.http.HttpResponseStatus;
import org.jboss.resteasy.specimpl.MultivaluedMapImpl;
import org.jboss.resteasy.spi.*;
import org.vertx.java.core.buffer.Buffer;
import org.vertx.java.core.http.HttpServerRequest;
import org.vertx.java.core.http.HttpServerResponse;

import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.NewCookie;
import javax.ws.rs.ext.RuntimeDelegate;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import java.util.Map;

import static io.netty.handler.codec.http.HttpHeaders.*;

class VertxHttpResponse implements HttpResponse {
    private Buffer buffer;
    private OutputStream outputStream;
    private ByteBufOutputStream underlyingOutputStream;
    private HttpServerRequest request;
    private boolean committed;
    private MultivaluedMap<String, Object> outputHeaders;
    private boolean keepAlive;
    private HttpServerResponse response;
    private ResteasyProviderFactory providerFactory;

    public VertxHttpResponse(HttpServerRequest request, ResteasyProviderFactory providerFactory) {
        this.response = request.response();
        this.providerFactory = providerFactory;
        this.underlyingOutputStream = new ByteBufOutputStream(Unpooled.buffer());
        this.outputStream = underlyingOutputStream;
        this.buffer = new Buffer(underlyingOutputStream.buffer());
        this.request = request;
        this.outputHeaders = new MultivaluedMapImpl<>();
        this.keepAlive = isKeepAlive(request);
    }

    HttpServerResponse getResponse() {
        return response;
    }

    private boolean isKeepAlive(HttpServerRequest request) {
        String connection = request.headers().get("Connection");
        if ("close".equalsIgnoreCase(connection)) {
            return false;
        } else if ("keep-alive".equalsIgnoreCase(connection)) {
            return true;
        }
        return false;
    }

    public boolean isKeepAlive() {
        return keepAlive;
    }

    public Buffer getBuffer() {
        return buffer;
    }

    @Override
    public int getStatus() {
        return response.getStatusCode();
    }

    @Override
    public void setStatus(int status) {
        response.setStatusCode(status);
    }

    @Override
    public MultivaluedMap<String, Object> getOutputHeaders() {
        return outputHeaders;
    }

    @Override
    public OutputStream getOutputStream() throws IOException {
        return outputStream;
    }

    @Override
    public void setOutputStream(OutputStream os) {
        this.outputStream = os;
    }

    @Override
    public void addNewCookie(NewCookie cookie) {
        outputHeaders.add(HttpHeaders.SET_COOKIE, cookie);
    }

    @Override
    public void sendError(int status) throws IOException {
        sendError(status, null);
    }

    @Override
    public void sendError(int status, String message) throws IOException {
        if (committed) {
            throw new IllegalStateException();
        }
        HttpResponseStatus responseStatus;
        if (message != null) {
            responseStatus = new HttpResponseStatus(status, message);
        } else {
            responseStatus = HttpResponseStatus.valueOf(status);
        }
        response.setStatusCode(responseStatus.code());
        if (keepAlive) {
            // Add keep alive and content length if needed
            response.putHeader(Names.CONNECTION, Values.KEEP_ALIVE);
            response.putHeader(Names.CONTENT_LENGTH, String.valueOf(0));
        }
        response.end();
        committed = true;
    }

    @Override
    public boolean isCommitted() {
        return committed;
    }

    @Override
    public void reset() {
        if (committed) {
            throw new IllegalStateException("Already committed");
        }
        outputHeaders.clear();
        underlyingOutputStream.buffer().clear();
        outputHeaders.clear();
    }

    public void finish() throws IOException {
        transformHeaders();
        request.response().end(buffer);
    }

    void transformHeaders() {
        HttpServerResponse response = this.getResponse();
        if (this.isKeepAlive()) {
            response.headers().set(Names.CONNECTION, Values.KEEP_ALIVE);
        } else {
            response.headers().set(Names.CONNECTION, Values.CLOSE);
        }

        for (Map.Entry<String, List<Object>> entry : this.getOutputHeaders().entrySet()) {
            String key = entry.getKey();
            for (Object value : entry.getValue()) {
                RuntimeDelegate.HeaderDelegate delegate = providerFactory.getHeaderDelegate(value.getClass());
                if (delegate != null) {
                    response.headers().add(key, delegate.toString(value));
                } else {
                    response.headers().set(key, value.toString());
                }
            }
        }
    }
}