/
Base64.java
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/
Base64.java
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/****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one *
* or more contributor license agreements. See the NOTICE file *
* distributed with this work for additional information *
* regarding copyright ownership. The ASF licenses this file *
* to you 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 org.apache.james.smtpserver;
import java.io.*;
import javax.mail.MessagingException;
import javax.mail.internet.MimeUtility;
/**
* Performs simple Base64 encoding and decode suitable for authentication. Note
* that this is not a general purpose codec.
*/
public class Base64 {
/**
* Decode base64 encoded String
*
* @param b64string
* base64 String
* @return reader the BufferedReader which holds the decoded base64 text
* @throws MessagingException
* get thrown when an error was detected while trying to decode
* the String
*/
public static BufferedReader decode(String b64string) throws MessagingException {
return new BufferedReader(new InputStreamReader(MimeUtility.decode(
new ByteArrayInputStream(b64string.getBytes()), "base64")));
}
/**
* Decode base64 encoded String
*
* @param b64string
* base64 Sting
* @return returnString the String which holds the docoded base64 text
* @throws MessagingException
* get thrown when an error was detected while trying to decode
* the String
* @throws IOException
* get thrown when I/O error was detected
*/
public static String decodeAsString(String b64string) throws IOException, MessagingException {
if (b64string == null) {
return b64string;
}
String returnString = decode(b64string).readLine();
if (returnString == null) {
return returnString;
}
return returnString.trim();
}
/**
* Encode String to base64
*
* @param plaintext
* the plaintext to encode
* @return out the ByteArrayOutputStream holding the encoded given text
* @throws IOException
* get thrown when I/O error was detected
* @throws MessagingException
* get thrown when an error was detected while trying to encode
* the String
*/
public static ByteArrayOutputStream encode(String plaintext) throws IOException, MessagingException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] in = plaintext.getBytes();
ByteArrayOutputStream inStream = new ByteArrayOutputStream();
inStream.write(in, 0, in.length);
// pad
if ((in.length % 3) == 1) {
inStream.write(0);
inStream.write(0);
} else if ((in.length % 3) == 2) {
inStream.write(0);
}
inStream.writeTo(MimeUtility.encode(out, "base64"));
return out;
}
/**
* Encode String to base64
*
* @param plaintext
* the plaintext to decode
* @return base64String the encoded String
* @throws IOException
* get thrown when I/O error was detected
* @throws MessagingException
* get thrown when an error was detected while trying to encode
* the String
*/
public static String encodeAsString(String plaintext) throws IOException, MessagingException {
return encode(plaintext).toString();
}
}