io.wcm.caravan.io.http.impl.RequestUtil.java Source code

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Here is the source code for io.wcm.caravan.io.http.impl.RequestUtil.java

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/*
 * #%L
 * wcm.io
 * %%
 * Copyright (C) 2014 wcm.io
 * %%
 * 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.
 * #L%
 */
package io.wcm.caravan.io.http.impl;

import io.wcm.caravan.commons.stream.Streams;
import io.wcm.caravan.io.http.request.Request;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.commons.lang3.StringUtils;
import org.apache.http.Header;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.entity.StringEntity;

import com.google.common.collect.ImmutableMap;
import com.netflix.loadbalancer.Server;

/**
 * Utility methods for preparing a request for execution.
 */
final class RequestUtil {

    private RequestUtil() {
        // static methods only
    }

    /**
     * @param server Server
     * @return URL prefix with scheme, hostname and port
     */
    public static String buildUrlPrefix(Server server) {
        StringBuilder urlPrefix = new StringBuilder();
        if (server.getPort() == 443 || server.getPort() == 8443) {
            urlPrefix.append("https");
        } else {
            urlPrefix.append("http");
        }
        urlPrefix.append("://").append(server.getHost());
        if (server.getPort() != 80 && server.getPort() != 443) {
            urlPrefix.append(":").append(server.getPort());
        }
        return urlPrefix.toString();
    }

    /**
     * @param urlPrefix URL prefix
     * @param request Requset
     * @return HTTP client request object
     */
    public static HttpUriRequest buildHttpRequest(String urlPrefix, Request request) {
        String url = urlPrefix + request.url();

        // http method
        HttpUriRequest httpRequest;
        String method = StringUtils.upperCase(request.method());
        switch (method) {
        case HttpGet.METHOD_NAME:
            httpRequest = new HttpGet(url);
            break;
        case HttpPost.METHOD_NAME:
            httpRequest = new HttpPost(url);
            break;
        case HttpPut.METHOD_NAME:
            httpRequest = new HttpPut(url);
            break;
        case HttpDelete.METHOD_NAME:
            httpRequest = new HttpDelete(url);
            break;
        default:
            throw new IllegalArgumentException("Unsupported HTTP method type: " + request.method());
        }

        // headers
        for (Entry<String, Collection<String>> entry : request.headers().entrySet()) {
            Streams.of(entry.getValue()).forEach(value -> httpRequest.addHeader(entry.getKey(), value));
        }

        // body
        if ((httpRequest instanceof HttpEntityEnclosingRequest) && request.body() != null) {
            HttpEntityEnclosingRequest entityHttpRequest = (HttpEntityEnclosingRequest) httpRequest;
            if (request.charset() != null) {
                entityHttpRequest.setEntity(
                        new StringEntity(new String(request.body(), request.charset()), request.charset()));
            } else {
                entityHttpRequest.setEntity(new ByteArrayEntity(request.body()));
            }
        }

        return httpRequest;
    }

    /**
     * @param headerArray Http-client header array
     * @return Map with header values
     */
    public static Map<String, Collection<String>> toHeadersMap(Header[] headerArray) {
        Map<String, List<String>> headerMap = new HashMap<>();
        for (Header header : headerArray) {
            List<String> values = headerMap.get(header.getName());
            if (values == null) {
                values = new ArrayList<>();
                headerMap.put(header.getName(), values);
            }
            values.add(header.getValue());
        }
        return ImmutableMap.copyOf(headerMap);
    }

}