| /* |
| * 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.nifi.processors.standard.util; |
| |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Arrays; |
| import org.apache.commons.codec.binary.Base32; |
| |
| /** |
| * An InputStream that throws an IOException if any byte is read that is not a valid Base32 character. Whitespace is considered valid. |
| */ |
| public class ValidatingBase32InputStream extends FilterInputStream { |
| |
| private final Base32 b32 = new Base32(); |
| |
| public ValidatingBase32InputStream(InputStream in) { |
| super(in); |
| } |
| |
| @Override |
| public int read(byte[] b, int offset, int len) throws IOException { |
| int numRead = super.read(b, offset, len); |
| if (numRead > 0) { |
| byte[] copy = b; |
| if (numRead < b.length) { |
| // isBase32 checks the whole length of byte[], we need to limit it to numRead |
| copy = Arrays.copyOf(b, numRead); |
| } |
| if (!b32.isInAlphabet(copy, true)) { |
| throw new IOException("Data is not base32 encoded."); |
| } |
| } |
| return numRead; |
| } |
| |
| @Override |
| public int read(byte[] b) throws IOException { |
| int numRead = super.read(b); |
| if (numRead > 0) { |
| byte[] copy = b; |
| if (numRead < b.length) { |
| // isBase32 checks the whole length of byte[], we need to limit it to numRead |
| copy = Arrays.copyOf(b, numRead); |
| } |
| if (!b32.isInAlphabet(copy, true)) { |
| throw new IOException("Data is not base32 encoded."); |
| } |
| } |
| return numRead; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| int data = super.read(); |
| if (!b32.isInAlphabet((byte) data)) { |
| throw new IOException("Data is not base32 encoded."); |
| } |
| return super.read(); |
| } |
| } |