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92 lines
3.5 KiB
Java
92 lines
3.5 KiB
Java
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// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.util;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.util.Date;
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import javax.annotation.Nonnull;
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import org.bouncycastle.openpgp.PGPCanonicalizedDataGenerator;
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import org.bouncycastle.openpgp.PGPLiteralDataGenerator;
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import org.pgpainless.algorithm.StreamEncoding;
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/**
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* Literal Data can be encoded in different ways.
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* BINARY encoding leaves the data as is and is generated through the {@link PGPLiteralDataGenerator}.
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* However, if the data is encoded in TEXT or UTF8 encoding, we need to use the {@link PGPCanonicalizedDataGenerator}
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* instead.
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*
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* This wrapper class acts as a handle for both options and provides a unified interface for them.
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*/
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public final class StreamGeneratorWrapper {
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private final StreamEncoding encoding;
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private final PGPLiteralDataGenerator literalDataGenerator;
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private final PGPCanonicalizedDataGenerator canonicalizedDataGenerator;
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/**
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* Create a new instance for the given encoding.
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*
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* @param encoding stream encoding
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* @return wrapper
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*/
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public static StreamGeneratorWrapper forStreamEncoding(@Nonnull StreamEncoding encoding) {
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if (encoding == StreamEncoding.BINARY) {
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return new StreamGeneratorWrapper(encoding, new PGPLiteralDataGenerator());
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} else {
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return new StreamGeneratorWrapper(encoding, new PGPCanonicalizedDataGenerator());
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}
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}
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private StreamGeneratorWrapper(@Nonnull StreamEncoding encoding, @Nonnull PGPLiteralDataGenerator literalDataGenerator) {
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if (encoding != StreamEncoding.BINARY) {
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throw new IllegalArgumentException("PGPLiteralDataGenerator can only be used with BINARY encoding.");
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}
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this.encoding = encoding;
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this.literalDataGenerator = literalDataGenerator;
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this.canonicalizedDataGenerator = null;
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}
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private StreamGeneratorWrapper(@Nonnull StreamEncoding encoding, @Nonnull PGPCanonicalizedDataGenerator canonicalizedDataGenerator) {
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if (encoding != StreamEncoding.TEXT && encoding != StreamEncoding.UTF8) {
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throw new IllegalArgumentException("PGPCanonicalizedDataGenerator can only be used with TEXT or UTF8 encoding.");
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}
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this.encoding = encoding;
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this.canonicalizedDataGenerator = canonicalizedDataGenerator;
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this.literalDataGenerator = null;
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}
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/**
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* Open a new encoding stream.
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*
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* @param outputStream wrapped output stream
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* @param filename file name
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* @param modificationDate modification date
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* @param buffer buffer
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* @return encoding stream
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*/
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public OutputStream open(OutputStream outputStream, String filename, Date modificationDate, byte[] buffer) throws IOException {
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if (literalDataGenerator != null) {
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return literalDataGenerator.open(outputStream, encoding.getCode(), filename, modificationDate, buffer);
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} else {
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return canonicalizedDataGenerator.open(outputStream, encoding.getCode(), filename, modificationDate, buffer);
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}
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}
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/**
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* Close all encoding streams opened by this generator wrapper.
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*/
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public void close() throws IOException {
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if (literalDataGenerator != null) {
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literalDataGenerator.close();
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}
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if (canonicalizedDataGenerator != null) {
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canonicalizedDataGenerator.close();
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}
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}
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}
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