com.microsoft.samples.federation.FederationMetadataDocument.java Source code

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Here is the source code for com.microsoft.samples.federation.FederationMetadataDocument.java

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//-----------------------------------------------------------------------
// <copyright file="Constants.java" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
//
// 
//    Copyright 2012 Microsoft Corporation
//    All rights reserved.
//
//    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
//
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 
// EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR 
// CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR NON-INFRINGEMENT.
//
// See the Apache Version 2.0 License for specific language governing 
// permissions and limitations under the License.
// </copyright>
//
// <summary>
//     
//
// </summary>
//----------------------------------------------------------------------------------------------
package com.microsoft.samples.federation;

import java.io.IOException;
import java.io.StringReader;
import java.security.cert.X509Certificate;
import java.util.Timer;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.methods.*;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.opensaml.saml2.metadata.provider.HTTPMetadataProvider;
import org.opensaml.saml2.metadata.provider.MetadataProviderException;
import org.opensaml.xml.XMLObject;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

public class FederationMetadataDocument {
    private static final String STS_ADDRESS_NODE_NAME = "/EntityDescriptor/RoleDescriptor/PassiveRequestorEndpoint/EndpointReference/Address/text()";
    private static final String X509_CERT_NODE_NAME = "/EntityDescriptor/Signature/KeyInfo/X509Data/X509Certificate/text()";
    //file system or HTTP URL
    private String _fmdUrl;
    private Document _fmdDoc = null;
    private boolean _loaded = false;
    private String _stsep = null;
    private String _x509CertStr = null;
    //singleton instance 
    private static FederationMetadataDocument _instance = null;

    private FederationMetadataDocument(String fmdUrl) {
        _fmdUrl = fmdUrl;
    }

    //returns entityID of the EntityDescriptor node
    public String getEntityID() {
        Node entityDescriptor = _fmdDoc.getFirstChild();
        return entityDescriptor.getAttributes().getNamedItem("entityID").getTextContent();
    }

    public String getSTSEndPoint() {
        if (_stsep == null)
            _stsep = getSingleNodeText(STS_ADDRESS_NODE_NAME);
        return _stsep;
    }

    public String getX509CertString() {
        if (_x509CertStr == null)
            _x509CertStr = getSingleNodeText(X509_CERT_NODE_NAME);
        return _x509CertStr;
    }

    private String getSingleNodeText(String xpathStr) {
        XPathFactory xpf = XPathFactory.newInstance();
        XPath xpath = xpf.newXPath();

        try {
            XPathExpression xpe = xpath.compile(xpathStr);
            NodeList nodeList = (NodeList) xpe.evaluate(_fmdDoc, XPathConstants.NODESET);
            if (nodeList.getLength() > 0) {
                return nodeList.item(0).getNodeValue();
            }

        } catch (XPathExpressionException e) {
            //do something here
        }
        return null;
    }

    private boolean load() {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder documentBuilder = factory.newDocumentBuilder();
            _fmdDoc = documentBuilder.parse(_fmdUrl);
            _loaded = true;
        } catch (Exception e) {
            //todo:revisit for strongly typed exception handling
            _loaded = false;
        }
        return _loaded;
    }

    //resets the transient state; once reset is called
    protected void reset() {
        _fmdDoc = null;
        _loaded = false;
    }

    public static FederationMetadataDocument getInstance(String fmdUrl) {
        if (_instance == null) {
            synchronized (FederationMetadataDocument.class) {
                _instance = new FederationMetadataDocument(fmdUrl);
                _instance.load();
            }
        }
        return _instance;
    }
}