/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * 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 org.keycloak.saml.processing.core.parsers.saml;

import org.keycloak.dom.saml.v2.assertion.NameIDType;
import org.keycloak.dom.saml.v2.protocol.StatusResponseType;
import org.keycloak.saml.common.constants.JBossSAMLConstants;
import org.keycloak.saml.common.constants.JBossSAMLURIConstants;
import org.keycloak.saml.common.exceptions.ParsingException;
import org.keycloak.saml.common.parsers.ParserNamespaceSupport;
import org.keycloak.saml.common.util.StaxParserUtil;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.events.StartElement;

import static org.keycloak.saml.common.constants.JBossSAMLConstants.LOGOUT_RESPONSE;

/**
 * Parse the SLO Response
 *
 * @author Anil.Saldhana@redhat.com
 * @since Nov 3, 2010
 */
public class SAMLSloResponseParser extends SAMLStatusResponseTypeParser implements ParserNamespaceSupport {

    public Object parse(XMLEventReader xmlEventReader) throws ParsingException {
        // Get the startelement
        StartElement startElement = StaxParserUtil.getNextStartElement(xmlEventReader);
        StaxParserUtil.validate(startElement, LOGOUT_RESPONSE.get());

        StatusResponseType response = parseBaseAttributes(startElement);

        while (xmlEventReader.hasNext()) {
            // Let us peek at the next start element
            startElement = StaxParserUtil.peekNextStartElement(xmlEventReader);
            if (startElement == null)
                break;
            String elementName = StaxParserUtil.getStartElementName(startElement);

            if (JBossSAMLConstants.ISSUER.get().equals(elementName)) {
                startElement = StaxParserUtil.getNextStartElement(xmlEventReader);
                NameIDType issuer = new NameIDType();
                issuer.setValue(StaxParserUtil.getElementText(xmlEventReader));
                response.setIssuer(issuer);
            } else if (JBossSAMLConstants.SIGNATURE.get().equals(elementName)) {
                startElement = StaxParserUtil.getNextStartElement(xmlEventReader);
                StaxParserUtil.bypassElementBlock(xmlEventReader, JBossSAMLConstants.SIGNATURE.get());
            } else if (JBossSAMLConstants.EXTENSIONS.get().equals(elementName)) {
                SAMLExtensionsParser extensionsParser = new SAMLExtensionsParser();
                response.setExtensions(extensionsParser.parse(xmlEventReader));
            } else if (JBossSAMLConstants.STATUS.get().equals(elementName)) {
                response.setStatus(parseStatus(xmlEventReader));
            }
        }
        return response;
    }

    /**
     * @see {@link ParserNamespaceSupport#supports(QName)}
     */
    public boolean supports(QName qname) {
        return JBossSAMLURIConstants.PROTOCOL_NSURI.get().equals(qname.getNamespaceURI())
                && LOGOUT_RESPONSE.equals(qname.getLocalPart());
    }
}