fr.dutra.confluence2wordpress.util.CodecUtils.java Source code

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Here is the source code for fr.dutra.confluence2wordpress.util.CodecUtils.java

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/**
 * Copyright 2011-2012 Alexandre Dutra
 *
 *    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 fr.dutra.confluence2wordpress.util;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

import org.apache.commons.codec.binary.Base64InputStream;
import org.apache.commons.codec.binary.Base64OutputStream;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.output.ByteArrayOutputStream;

public class CodecUtils {

    private static final String UTF_8 = "UTF-8";

    public static String compressAndEncode(String text) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        GZIPOutputStream gzos = new GZIPOutputStream(new Base64OutputStream(baos));
        try {
            gzos.write(text.getBytes(UTF_8));
        } finally {
            baos.close();
            gzos.close();
        }
        return new String(baos.toByteArray(), UTF_8);
    }

    public static String decodeAndExpand(String encoded) throws IOException {
        GZIPInputStream gzis = new GZIPInputStream(
                new Base64InputStream(new ByteArrayInputStream(encoded.getBytes(UTF_8))));
        try {
            return IOUtils.toString(gzis, UTF_8);
        } finally {
            gzis.close();
        }
    }

    /**
     * Returns the MD5 hash of the given email, as required by Gravatar.
     * @see "http://fr.gravatar.com/site/implement/hash/"
     * @param email
     * @return
     */
    public static String gravatarHash(String email) {
        return DigestUtils.md5Hex(email.trim().toLowerCase());
    }
}