/*
* Copyright © 2014 Cask Data, Inc.
*
* Licensed 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 co.cask.cdap.security.auth;
import co.cask.cdap.common.io.BinaryDecoder;
import co.cask.cdap.common.io.BinaryEncoder;
import co.cask.cdap.common.io.Codec;
import co.cask.cdap.common.io.Decoder;
import co.cask.cdap.common.io.Encoder;
import co.cask.cdap.internal.io.DatumReader;
import co.cask.cdap.internal.io.DatumReaderFactory;
import co.cask.cdap.internal.io.DatumWriter;
import co.cask.cdap.internal.io.DatumWriterFactory;
import co.cask.cdap.internal.io.Schema;
import com.google.common.reflect.TypeToken;
import com.google.inject.Inject;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
/**
* Utility to encode and decode keys that are shared between keyManagers.
*/
public class KeyIdentifierCodec implements Codec<KeyIdentifier> {
private static final TypeToken<KeyIdentifier> KEY_IDENTIFIER_TYPE = new TypeToken<KeyIdentifier>() { };
private final DatumReaderFactory readerFactory;
private final DatumWriterFactory writerFactory;
@Inject
public KeyIdentifierCodec(DatumReaderFactory readerFactory, DatumWriterFactory writerFactory) {
this.readerFactory = readerFactory;
this.writerFactory = writerFactory;
}
@Override
public byte[] encode(KeyIdentifier keyIdentifier) throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
Encoder encoder = new BinaryEncoder(bos);
encoder.writeInt(KeyIdentifier.Schemas.getVersion());
DatumWriter<KeyIdentifier> writer = writerFactory.create(KEY_IDENTIFIER_TYPE,
KeyIdentifier.Schemas.getCurrentSchema());
writer.encode(keyIdentifier, encoder);
return bos.toByteArray();
}
@Override
public KeyIdentifier decode(byte[] data) throws IOException {
ByteArrayInputStream bis = new ByteArrayInputStream(data);
Decoder decoder = new BinaryDecoder(bis);
DatumReader<KeyIdentifier> reader = readerFactory.create(KEY_IDENTIFIER_TYPE,
KeyIdentifier.Schemas.getCurrentSchema());
int readVersion = decoder.readInt();
Schema readSchema = KeyIdentifier.Schemas.getSchemaVersion(readVersion);
if (readSchema == null) {
throw new IOException("Unknown schema version for KeyIdentifier: " + readVersion);
}
return reader.read(decoder, readSchema);
}
}