identityutil.java

开源的OpenId的一个java实现

package org.wso2.solutions.identity.util;

import org.apache.axiom.om.impl.dom.factory.OMDOMFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.xml.security.utils.Base64;
import org.w3c.dom.Document;
import org.w3c.dom.Node;

import java.security.MessageDigest;

public class IdentityUtil {

    private static Log log = LogFactory.getLog(IdentityUtil.class);

    private final static char[] ppidDisplayCharMap = new char[] { 'Q', 'L',
            '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',
            'F', 'G', 'H', 'J', 'K', 'M', 'N', 'P', 'R', 'S', 'T', 'U', 'V',
            'W', 'X', 'Y', 'Z' };

    private static Document importerDoc = null;
    
    public static String getPPIDDisplayValue(String value) throws Exception {
        log.info("Generating display value of PPID : " + value);
        byte[] rawPpid = Base64.decode(value);
        MessageDigest sha1 = MessageDigest.getInstance("SHA1");
        sha1.update(rawPpid);
        byte[] hashId = sha1.digest();
        char[] returnChars = new char[10];
        for (int i = 0; i < 10; i++) {
            int rawValue = (hashId[i] + 128) % 32;
            returnChars[i] = ppidDisplayCharMap[rawValue];
        }
        StringBuffer sb = new StringBuffer();
        sb.append(returnChars, 0, 3);
        sb.append("-");
        sb.append(returnChars, 3, 4);
        sb.append("-");
        sb.append(returnChars, 6, 3);
        return sb.toString();

    }
    
    /**
     * Serialize the given node to a String.
     * @param node Node to be serialized.
     * @return The serialized node as a java.lang.String instance.
     */
    public static String nodeToString(Node node) {

        if(importerDoc == null) {
            OMDOMFactory fac = new OMDOMFactory();
            importerDoc = (Document)fac.createOMDocument();
        }
        //Import the node as an AXIOM-DOOM node and use toSting()
        Node axiomNode = importerDoc.importNode(node, true);
        return axiomNode.toString(); 
    }
}