java – 消耗SAMLResponse令牌

>获取SAMLResponse令牌并对其进行解码并充气：

// Base64 decode
Base64 base64Decoder = new Base64();
byte[] xmlBytes = encodedXmlString.getBytes("UTF-8");
byte[] base64DecodedByteArray = base64Decoder.decode(xmlBytes);

// Inflate (uncompress) the AuthnRequest data
// First attempt to unzip the byte array according to DEFLATE (rfc 1951)

Inflater inflater = new Inflater(true);
inflater.setInput(base64DecodedByteArray);
// since we are decompressing,it's impossible to know how much space we
// might need; hopefully this number is suitably big
byte[] xmlMessageBytes = new byte[5000];
int resultLength = inflater.inflate(xmlMessageBytes);

if (!inflater.finished()) {
    throw new RuntimeException("didn't allocate enough space to hold "
            + "decompressed data");
}

inflater.end();

String decodedResponse = new String(xmlMessageBytes,resultLength,"UTF-8");

return decodedResponse;

>解析生成的XML.在这里,您可以获得所需的信息,例如,使用它创建一个POJO(这是用于解析LogoutRequest的示例代码,但是类似于响应)：

// Parse the XML. SAX approach,we just need the ID attribute
SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();

// If we want to validate the doc we need to load the DTD
// saxParserFactory.setValidating(true);

// Get a SAXParser instance
SAXParser saxParser = saxParserFactory.newSAXParser();

// Parse it
XMLhandler xmLhandler = new XMLhandler();
saxParser.parse(new ByteArrayInputStream(xmlLogoutRequest.getBytes()),xmLhandler);

// Return the SamlVO
return xmLhandler.getSamlVO();

对于我的用例我很有趣的只有几个元素,所以我使用SAX：

public class XMLhandler extends DefaultHandler {

    private SamlVO samlVO;

    public XMLhandler() {
        samlVO = new SamlVO();
    }

    @Override
    public void startElement(String uri,String localName,String qName,Attributes attributes) throws SAXException {

        // Managing a LogoutRequest means that we are going to build a LogoutResponse
        if (qName.equals("samlp:LogoutRequest")) {
            // The ID value of a request will be the LogoutResponse's InReponseTo attribute 
            samlVO.setInResponseTo(attributes.getValue("ID"));
            // From the destination we can get the Issuer element
            String destination = attributes.getValue("Destination");
            if (destination != null) {
                URL destinationUrl = null;
                try {
                    destinationUrl = new URL(destination);
                } catch (MalformedURLException e) {
                     // TODO: We could set the server hostname (take it from a property),but this URL SHOULD be well formed!
                     e.printStackTrace();
                }
                samlVO.setIssuer(destinationUrl.getHost());
            }
        }   
    }

    public SamlVO getSamlVO() {
        return samlVO;
    }

}

希望有帮助,

路易斯

PS：你也可以使用像OpenSAML这样的图书馆

DefaultBootstrap.bootstrap();

HTTPRedirectDeflateDecoder decode = new HTTPRedirectDeflateDecoder(new BasicParserPool());
BasicSAMLMessageContext<LogoutRequest,?,?> messageContext = new BasicSAMLMessageContext<LogoutRequest,SAMLObject,SAMLObject>();
messageContext.setInboundMessageTransport(new HttpServletRequestAdapter(request));
decode.decode(messageContext);
XMLObjectBuilderFactory builderFactory = org.opensaml.Configuration.getBuilderFactory();
LogoutRequestBuilder logoutRequestBuilder = (LogoutRequestBuilder) builderFactory.getBuilder(LogoutRequest.DEFAULT_ELEMENT_NAME);
LogoutRequest logoutRequest = logoutRequestBuilder.buildObject();
logoutRequest = (LogoutRequest) messageContext.getInboundMessage();

但是准备在你的CLASSPATH中包含几个库！