com.predic8.membrane.core.interceptor.authentication.xen.XenCredentialAccessor Maven / Gradle / Ivy

/* Copyright 2019 predic8 GmbH, www.predic8.com

   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 com.predic8.membrane.core.interceptor.authentication.xen;

import com.predic8.membrane.core.exchange.Exchange;
import com.predic8.membrane.core.interceptor.Interceptor;

import javax.xml.xpath.*;

public class XenCredentialAccessor implements CredentialAccessor  {

    public static class XenLoginData {
        String username;
        String password;
    }

    private final XPathFactory xPathFactory = XPathFactory.newInstance();

    @Override
    public XenLoginData getLogin(Exchange exchange) {
        try {
            XenMessageContext xmc = XenMessageContext.get(exchange, Interceptor.Flow.REQUEST);

            XPath xp;
            synchronized (xPathFactory) {
                xp = xPathFactory.newXPath();
            }
            XPathExpression xp1 = xp.compile("/methodCall/methodName/text()");
            String methodName = (String) xp1.evaluate(xmc.getDocument(), XPathConstants.STRING);

            XenLoginData loginData = new XenLoginData();

            XPathExpression xp2 = xp.compile("/methodCall/params/param[1]/value/string/text()");
            loginData.username = (String) xp2.evaluate(xmc.getDocument(), XPathConstants.STRING);

            XPathExpression xp3 = xp.compile("/methodCall/params/param[2]/value/string/text()");
            loginData.password = (String) xp3.evaluate(xmc.getDocument(), XPathConstants.STRING);


            if (!"session.login_with_password".equals(methodName))
                return null;

            return loginData;
        } catch (XPathExpressionException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void replaceLogin(Exchange exchange, XenLoginData newLoginData) {
        try {
            XenMessageContext xmc = XenMessageContext.get(exchange, Interceptor.Flow.REQUEST);

            XPath xp;
            synchronized (xPathFactory) {
                xp = xPathFactory.newXPath();
            }

            xmc.setX(xp, "/methodCall/params/param[1]/value/string/text()", newLoginData.username);

            xmc.setX(xp, "/methodCall/params/param[2]/value/string/text()", newLoginData.password);

            xmc.writeBack();
        } catch (XPathExpressionException e) {
            throw new RuntimeException(e);
        }
    }

}