# HttpRequestInformationProcessor.java

    /*
     * Copyright (c) 2019, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
     *
     * WSO2 Inc. 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 org.apache.synapse.commons.emulator.http.producer;

    import io.netty.handler.codec.http.DefaultFullHttpRequest;
    import io.netty.handler.codec.http.HttpHeaders;
    import io.netty.handler.codec.http.HttpRequest;
    import io.netty.handler.codec.http.HttpVersion;
    import io.netty.handler.codec.http.cookie.ClientCookieEncoder;
    import io.netty.handler.codec.http.cookie.DefaultCookie;
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.synapse.commons.emulator.http.dsl.HttpProducerContext;
    import org.apache.synapse.commons.emulator.http.dsl.dto.Cookie;
    import org.apache.synapse.commons.emulator.http.dsl.dto.Header;
    import org.apache.synapse.commons.emulator.http.dsl.dto.producer.IncomingMessage;

    import java.net.URI;

    public class HttpRequestInformationProcessor {
        private static final Log log = LogFactory.getLog(HttpRequestInformationProcessor.class);

        public HttpRequest populateHttpRequest(HttpProducerContext producerContext, IncomingMessage incomingMessage)
                throws Exception {

            String uri = getURI(producerContext.getHost(), producerContext.getPort(), incomingMessage);
            URI requestUri = new URI(uri);
            producerContext.host(requestUri.getHost());
            String scheme = requestUri.getScheme();

            if (!"http".equalsIgnoreCase(scheme) && !"https".equalsIgnoreCase(scheme)) {
                log.error("Only HTTP(S) is supported.");
                //Need to log
            }
            HttpRequest request = new DefaultFullHttpRequest(
                    HttpVersion.HTTP_1_1, incomingMessage.getMethod(), requestUri.getRawPath());
            populateHeader(request, requestUri.getHost(), incomingMessage);
            populateCookies(request, incomingMessage);
            return request;
        }

        private void populateHeader(HttpRequest request, String host, IncomingMessage incomingMessage) {
            request.headers().set(HttpHeaders.Names.HOST, host);
            request.headers().set(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.CLOSE);
            request.headers().set(HttpHeaders.Names.ACCEPT_ENCODING, HttpHeaders.Values.GZIP);
            if (incomingMessage.getBody() != null) {
                request.headers().set(HttpHeaders.Names.CONTENT_LENGTH, incomingMessage.getBody().getBytes()
                        .length);
            }
            if (incomingMessage.getHeaders() != null) {
                for (Header header : incomingMessage.getHeaders()) {
                    request.headers().set(header.getName(), header.getValue());
                }
            }
        }

        private void populateCookies(HttpRequest request, IncomingMessage incomingMessage) {
            if (incomingMessage.getCookies() != null) {
                DefaultCookie[] cookies = new DefaultCookie[incomingMessage.getCookies().size()];
                int i = 0;
                for (Cookie cookie : incomingMessage.getCookies()) {
                    cookies[i++] = new DefaultCookie(cookie.getName(), cookie.getValue());
                }
                request.headers().set(
                        HttpHeaders.Names.COOKIE,
                        ClientCookieEncoder.STRICT.encode(cookies));
            }
        }

        private String getURI(String host, int port, IncomingMessage incomingMessage) {
            String path = incomingMessage.getPath();
            String uri = host + ":" + port;
            if (path.startsWith("/")) {
                uri = uri + path;
            } else {
                uri = uri + "/" + path;
            }
            return uri;
        }
    }