001/**
002 *
003 * Copyright © 2014 Florian Schmaus
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.android;
018
019import java.io.UnsupportedEncodingException;
020
021import org.jivesoftware.smack.util.StringUtils;
022import org.jivesoftware.smack.util.stringencoder.StringEncoder;
023
024import android.util.Base64;
025
026public final class AndroidBase64UrlSafeEncoder implements StringEncoder {
027
028    private static AndroidBase64UrlSafeEncoder instance = new AndroidBase64UrlSafeEncoder();
029
030    private static final int BASE64_ENCODER_FLAGS = Base64.URL_SAFE | Base64.NO_WRAP;
031
032    private AndroidBase64UrlSafeEncoder() {
033        // Use getInstance()
034    }
035
036    public static AndroidBase64UrlSafeEncoder getInstance() {
037        return instance;
038    }
039
040    @Override
041    public String encode(String string) {
042        try {
043            return Base64.encodeToString(string.getBytes(StringUtils.UTF8), BASE64_ENCODER_FLAGS);
044        } catch (UnsupportedEncodingException e) {
045            throw new IllegalStateException("UTF-8 not supported", e);
046        }
047    }
048
049    @Override
050    public String decode(String string) {
051        byte[] bytes = Base64.decode(string, BASE64_ENCODER_FLAGS);
052        try {
053            return new String(bytes, StringUtils.UTF8);
054        } catch (UnsupportedEncodingException e) {
055            throw new IllegalStateException("UTF-8 not supported", e);
056        }
057    }
058
059}