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.io.UnsupportedEncodingException; 020 021import org.jivesoftware.smack.util.StringUtils; 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 { 037 038 private static final Java7Base64UrlSafeEncoder instance = new Java7Base64UrlSafeEncoder(); 039 040 private static final int BASE64_ENCODER_FLAGS = Base64.URL_SAFE | Base64.DONT_BREAK_LINES; 041 042 private Java7Base64UrlSafeEncoder() { 043 // Use getInstance() 044 } 045 046 public static Java7Base64UrlSafeEncoder getInstance() { 047 return instance; 048 } 049 050 @Override 051 public String encode(String s) { 052 byte[] bytes; 053 try { 054 bytes = s.getBytes(StringUtils.UTF8); 055 } 056 catch (UnsupportedEncodingException e) { 057 throw new AssertionError(e); 058 } 059 return Base64.encodeBytes(bytes, BASE64_ENCODER_FLAGS); 060 } 061 062 @Override 063 public String decode(String s) { 064 try { 065 return new String(Base64.decode(s, BASE64_ENCODER_FLAGS), StringUtils.UTF8); 066 } 067 catch (UnsupportedEncodingException e) { 068 throw new AssertionError(e); 069 } 070 } 071 072}