001/**
002 *
003 * Copyright the original author or authors
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smack.util.stringencoder.java7;
018
019import java.nio.charset.StandardCharsets;
020import java.util.Base64;
021
022import org.jivesoftware.smack.util.stringencoder.StringEncoder;
023
024
025/**
026 * A Base 64 encoding implementation that generates filename and Url safe encodings.
027 *
028 * <p>
029 * Note: This does NOT produce standard Base 64 encodings, but a variant as defined in
030 * Section 4 of RFC3548:
031 * <a href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org/rfcs/rfc3548.html</a>.
032 * </p>
033 *
034 * @author Robin Collier
035 */
036public final class Java7Base64UrlSafeEncoder implements StringEncoder<String> {
037
038    private static final Java7Base64UrlSafeEncoder instance = new Java7Base64UrlSafeEncoder();
039
040    private final Base64.Encoder encoder;
041    private final Base64.Decoder decoder;
042
043    private Java7Base64UrlSafeEncoder() {
044        encoder = Base64.getUrlEncoder();
045        decoder = Base64.getUrlDecoder();
046    }
047
048    public static Java7Base64UrlSafeEncoder getInstance() {
049        return instance;
050    }
051
052    @Override
053    public String encode(String s) {
054        byte[] bytes = s.getBytes(StandardCharsets.UTF_8);
055        return encoder.encodeToString(bytes);
056    }
057
058    @Override
059    public String decode(String s) {
060        byte[] bytes = decoder.decode(s);
061        return new String(bytes, StandardCharsets.UTF_8);
062    }
063
064}