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9a65887789
Ghostryde.java has a lot of duplicate code with RydeEncoder and the future RydeDecoder - the encryption/decryption, compression/decompression, file encoding/decoding. The "de-XXX" part of each of these pairs needs to read a PGP object from a stream using PGPObjectFactory. Since we want to move the duplicate code into their own files, we will need to move the "read PGP objects from stream" functions to a common utility class. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=205092800
65 lines
2.4 KiB
Java
65 lines
2.4 KiB
Java
// Copyright 2018 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.rde;
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import static com.google.common.base.Preconditions.checkNotNull;
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import static com.google.common.base.Preconditions.checkState;
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import com.google.common.collect.Streams;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.stream.Stream;
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import javax.annotation.Nullable;
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import org.bouncycastle.openpgp.PGPEncryptedDataList;
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import org.bouncycastle.openpgp.PGPObjectFactory;
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import org.bouncycastle.openpgp.jcajce.JcaPGPObjectFactory;
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/** Utilities that help us deal with Pgp objects. */
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final class PgpUtils {
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private PgpUtils() {}
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/** Safely extracts an object from an OpenPGP message. */
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static <T> T pgpCast(@Nullable Object object, Class<T> expect) {
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checkNotNull(object, "PGP error: expected %s but out of objects", expect.getSimpleName());
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checkState(
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expect.isAssignableFrom(object.getClass()),
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"PGP error: expected %s but got %s",
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expect.getSimpleName(),
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object.getClass().getSimpleName());
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return expect.cast(object);
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}
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static <T> T readSinglePgpObject(InputStream input, Class<T> expect) {
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try {
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PGPObjectFactory fact = new JcaPGPObjectFactory(input);
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return PgpUtils.pgpCast(fact.nextObject(), expect);
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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/**
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* Stream the "list" that is PGPEncryptedDataList.
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*
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* <p>PGPEncryptedDataList is apparently very "legacy". It's not actually a list, and although it
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* implements "Iterable", there's no explicit type given. This requires multiple casts, which is
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* ugly. Moving the casts to a dedicated function makes it all clearer.
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*/
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static <T> Stream<T> stream(PGPEncryptedDataList ciphertexts, Class<T> expect) {
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return Streams.stream((Iterable<?>) ciphertexts)
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.map(ciphertext -> PgpUtils.pgpCast(ciphertext, expect));
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}
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}
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