net.paygate.saml.util.RequestUtil.java Source code

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Here is the source code for net.paygate.saml.util.RequestUtil.java

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/*
 * Copyright (C) 2006 Google Inc.
 * 
 * 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 net.paygate.saml.util;

import org.apache.commons.codec.binary.Base64;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.zip.DeflaterOutputStream;

/**
 * This utility class is used across the various servlets that make up the
 * SAML-based Single Sign-On Reference Tool. It includes various helper methods
 * that are used for the SAML transactions.
 * 
 */
public class RequestUtil {
    /**
     * Generates an encoded and compressed String from the specified XML-formatted
     * String. The String is encoded in the following order:
     * <p>
     * 1. URL encode <br>
     * 2. Base64 encode <br>
     * 3. Deflate <br>
     * 
     * @param xmlString XML-formatted String that is to be encoded
     * @return String containing the encoded contents of the specified XML String
     */
    public static String encodeMessage(String xmlString) throws IOException, UnsupportedEncodingException {
        // first DEFLATE compress the document (saml-bindings-2.0,
        // section 3.4.4.1)
        byte[] xmlBytes = xmlString.getBytes("UTF-8");
        ByteArrayOutputStream byteOutputStream = new ByteArrayOutputStream();
        DeflaterOutputStream deflaterOutputStream = new DeflaterOutputStream(byteOutputStream);
        deflaterOutputStream.write(xmlBytes, 0, xmlBytes.length);
        deflaterOutputStream.close();

        // next, base64 encode it
        Base64 base64Encoder = new Base64();
        byte[] base64EncodedByteArray = base64Encoder.encode(byteOutputStream.toByteArray());
        String base64EncodedMessage = new String(base64EncodedByteArray);

        // finally, URL encode it
        String urlEncodedMessage = URLEncoder.encode(base64EncodedMessage);

        return urlEncodedMessage;
    }

    /**
     * Returns HTML encoded version of the specified String s.
     * 
     * @param s String to be HTML encoded
     * @return HTML encoded String
     */
    public static String htmlEncode(String s) {
        StringBuffer encodedString = new StringBuffer("");
        char[] chars = s.toCharArray();
        for (int i = 0; i < chars.length; i++) {
            char c = chars[i];
            if (c == '<') {
                encodedString.append("&lt;");
            } else if (c == '>') {
                encodedString.append("&gt;");
            } else {
                encodedString.append(c);
            }
        }
        return encodedString.toString();
    }

}