Hack23/cia

/*
 * Copyright 2010-2021 James Pether Sörling
 *
 * 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.
 *
 *    $Id$
 *  $HeadURL$
*/
package com.hack23.cia.service.external.common.impl;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.util.Locale;

import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;

import org.apache.http.client.fluent.Request;
import org.jdom2.JDOMException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.oxm.Unmarshaller;
import org.springframework.stereotype.Service;

import com.hack23.cia.service.external.common.api.XmlAgent;
import com.hack23.cia.service.external.common.api.XmlAgentException;

/**
 * The Class XmlAgentImpl.
 */
@Service
final class XmlAgentImpl implements XmlAgent {

    /** The Constant LOGGER. */
    private static final Logger LOGGER = LoggerFactory.getLogger(XmlAgentImpl.class);

    /**
     * Instantiates a new xml agent impl.
     */
    public XmlAgentImpl() {
        super();
    }

    /**
     * Read with string buffer.
     *
     * @param fr
     *            the fr
     * @return the string
     * @throws IOException
     *             Signals that an I/O exception has occurred.
     */
    private static String readWithStringBuffer(final Reader fr) throws IOException {

        final BufferedReader br = new BufferedReader(fr);
        String line;
        final StringBuilder result = new StringBuilder();
        while ((line = br.readLine()) != null) {
            result.append(line);
        }

        return result.toString();
    }

    @Override
    public String retriveContent(final String accessUrl) throws XmlAgentException {
        try {
            final URL url = URI.create(accessUrl.replace(" ", "")).toURL(); 
                    
            return readWithStringBuffer(new BufferedReader(new InputStreamReader(url.openStream(), StandardCharsets.UTF_8)));
        } catch (final IOException e) {
            throw new XmlAgentException(e);
        }
    }


    @Override
    public Object unmarshallXml(final Unmarshaller unmarshaller, final String accessUrl) throws XmlAgentException {
        return unmarshallXml(unmarshaller, accessUrl, null, null, null);
    }

    @Override
    public Object unmarshallXml(final Unmarshaller unmarshaller, final String accessUrl, final String nameSpace,
            final String replace, final String with) throws XmlAgentException {

        try {
            LOGGER.info("Calls {}", accessUrl);

            final boolean isWeb = accessUrl.toLowerCase(Locale.ENGLISH).startsWith("http://")
                    || accessUrl.toLowerCase(Locale.ENGLISH).startsWith("https://");

            String xmlContent;
            if (isWeb) {
                xmlContent = Request.Get(accessUrl.replace(" ", "")).execute().returnContent()
                        .asString(StandardCharsets.UTF_8);
            } else {
                xmlContent = readInputStream(accessUrl.replace(" ", ""));
            }

            if (replace != null) {
                xmlContent = xmlContent.replace(replace, with);
            }

            final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(
                    xmlContent.getBytes(StandardCharsets.UTF_8));

            Source source;
            if (nameSpace != null) {
                source = NameSpaceUtil.setNameSpaceOnXmlStream(byteArrayInputStream, nameSpace);
            } else {
                source = new StreamSource(byteArrayInputStream);
            }

            return unmarshaller.unmarshal(source);
        } catch (IOException | JDOMException e) {
            throw new XmlAgentException(e);
        }
    }

    /**
     * Read input stream.
     *
     * @param accessUrl
     *            the access url
     * @return the string
     * @throws IOException
     *             Signals that an I/O exception has occurred.
     */
    private static String readInputStream(final String accessUrl) throws IOException {
        final URL url = URI.create(accessUrl.replace(" ", "")).toURL();
        return readWithStringBuffer(new BufferedReader(new InputStreamReader(url.openConnection().getInputStream(), StandardCharsets.UTF_8)));
    }
}