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/*
* This program is a part of the IoTa project.
*
* Copyright © 2013 Université de Caen Basse-Normandie, GREYC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* <http://www.gnu.org/licenses/>
*
* See AUTHORS for a list of contributors.
*/
package fr.unicaen.iota.eta.capture;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.StringWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.KeyStore;
import java.security.SecureRandom;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManagerFactory;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.fosstrak.epcis.captureclient.CaptureClient;
import org.fosstrak.epcis.captureclient.CaptureClientException;
import org.fosstrak.epcis.model.Document;
import org.fosstrak.epcis.model.EPCISDocumentType;
import org.fosstrak.epcis.model.EPCISMasterDataDocumentType;
import org.fosstrak.epcis.model.ObjectFactory;

public class ETaCaptureClient extends CaptureClient {

private final String pksFilename;
private final String pksPassword;
private final String trustPksFilename;
private final String trustPksPassword;
private static final Log log = LogFactory.getLog(ETaCaptureClient.class);

public ETaCaptureClient(String url, Object[] authOptions,
String pksFilename, String pksPassword, String trustPksFilename, String trustPksPassword) {
super(url, authOptions);
this.pksFilename = pksFilename;
this.pksPassword = pksPassword;
this.trustPksFilename = trustPksFilename;
this.trustPksPassword = trustPksPassword;
}

public ETaCaptureClient(String url, String pksFilename, String pksPassword,
String trustPksFilename, String trustPksPassword) {
super(url);
this.pksFilename = pksFilename;
this.pksPassword = pksPassword;
this.trustPksFilename = trustPksFilename;
this.trustPksPassword = trustPksPassword;
}

/**
* {@inheritDoc
*/
@Override
public int dbReset() throws CaptureClientException {
String formParam = "dbReset=true";
try {
return doPost(formParam, "application/x-www-form-urlencoded");
} catch (Exception e) {
throw new CaptureClientException("error communicating with ETa cpature interface: " + e.getMessage(), e);
}
}

/**
* {@inheritDoc}
*/
@Override
public int capture(final InputStream xmlStream) throws CaptureClientException {
try {
return doPost(xmlStream, "text/xml");
} catch (Exception e) {
throw new CaptureClientException("error communicating with ETa cpature interface: " + e.getMessage(), e);
}
}

/**
* {@inheritDoc}
*/
@Override
public int capture(final String eventXml) throws CaptureClientException {
try {
return doPost(eventXml, "text/xml");
} catch (Exception e) {
throw new CaptureClientException("error communicating with ETa cpature interface: " + e.getMessage(), e);
}
}

/**
* {@inheritDoc}
*/
@Override
public int capture(final Document epcisDoc) throws CaptureClientException {
StringWriter writer = new StringWriter();
ObjectFactory objectFactory = new ObjectFactory();
try {
JAXBContext context = JAXBContext.newInstance("org.fosstrak.epcis.model");
JAXBElement<? extends Document> item;
if (epcisDoc instanceof EPCISDocumentType) {
item = objectFactory.createEPCISDocument((EPCISDocumentType) epcisDoc);
} else {
item = objectFactory.createEPCISMasterDataDocument((EPCISMasterDataDocumentType) epcisDoc);
}
Marshaller marshaller = context.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
marshaller.marshal(item, writer);
} catch (JAXBException e) {
throw new CaptureClientException("error serializing EPCIS Document: " + e.getMessage(), e);
}
return capture(writer.toString());
}

/**
* Send data to the repository's capture operation using HTTP POST. The data
* will be sent using the given content-type.
* @param data The data to send.
* @return The HTTP response message from the repository.
* @throws IOException If an error on the HTTP layer occurred.
* @throws CaptureClientException
* @throws Exception
*/
private int doPost(final InputStream data, final String contentType) throws IOException, CaptureClientException, Exception {
HttpURLConnection connection = getConnection(contentType);
// read from input and write to output
OutputStream os = connection.getOutputStream();
int b;
while ((b = data.read()) != -1) {
os.write(b);
}
os.flush();
os.close();
return connection.getResponseCode();
}

/**
* Send data to the repository's capture operation using HTTP POST. The data
* will be sent using the given content-type.
* @param data The data to send.
* @return The HTTP response message
* @throws IOException If an error on the HTTP layer occurred.
* @throws Exception
*/
private int doPost(final String data, final String contentType) throws CaptureClientException, IOException, Exception {
HttpURLConnection connection = getConnection(contentType);
// write the data
OutputStreamWriter wr = new OutputStreamWriter(connection.getOutputStream());
wr.write(data);
wr.flush();
wr.close();
return connection.getResponseCode();
}

/**
* Opens a connection to the ETa capture interface.
* @param contentType The HTTP content-type, e.g., <code>text/xml</code>
* @return The HTTP connection object.
* @throws IOException If an error occurred connecting to the interface.
* @throws Exception
*/
private HttpURLConnection getConnection(final String contentType) throws IOException, Exception {
if (pksFilename != null && pksPassword != null && trustPksFilename != null && trustPksPassword != null) {
System.setProperty("javax.net.ssl.keyStore", pksFilename);
System.setProperty("javax.net.ssl.keyStorePassword", pksPassword);
System.setProperty("javax.net.ssl.trustStore", trustPksFilename);
System.setProperty("javax.net.ssl.trustStorePassword", trustPksPassword);
}
URL serviceUrl = new URL(getCaptureUrl());
HttpURLConnection connection = (HttpURLConnection) serviceUrl.openConnection();

if (pksFilename != null) {
KeyStore keyStore = KeyStore.getInstance(pksFilename.endsWith(".p12") ? "PKCS12" : "JKS");
keyStore.load(new FileInputStream(new File(pksFilename)), pksPassword.toCharArray());
KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance("SunX509");
keyManagerFactory.init(keyStore, pksPassword.toCharArray());
KeyStore trustStore = KeyStore.getInstance(trustPksFilename.endsWith(".p12") ? "PKCS12" : "JKS");
trustStore.load(new FileInputStream(new File(trustPksFilename)), trustPksPassword.toCharArray());
TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance("SunX509");
trustManagerFactory.init(trustStore);
SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(keyManagerFactory.getKeyManagers(), trustManagerFactory.getTrustManagers(), new SecureRandom());
((HttpsURLConnection) connection).setSSLSocketFactory(sslContext.getSocketFactory());
}

connection.setRequestProperty("content-type", contentType);
connection.setRequestMethod("POST");
connection.setDoInput(true);
connection.setDoOutput(true);
return connection;
}

}
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