kopia lustrzana https://github.com/gaul/s3proxy
108 wiersze
3.2 KiB
Java
108 wiersze
3.2 KiB
Java
/*
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* Copyright 2014-2020 Andrew Gaul <andrew@gaul.org>
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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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* https://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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*/
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package org.gaul.s3proxy;
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import java.io.FilterInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import com.google.common.io.ByteStreams;
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/**
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* Parse an AWS v4 signature chunked stream. Reference:
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* https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-streaming.html
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*/
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final class ChunkedInputStream extends FilterInputStream {
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private byte[] chunk;
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private int currentIndex;
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private int currentLength;
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@edu.umd.cs.findbugs.annotations.SuppressFBWarnings(
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value = "URF_UNREAD_FIELD",
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justification = "https://github.com/gaul/s3proxy/issues/205")
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private String currentSignature;
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ChunkedInputStream(InputStream is) {
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super(is);
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}
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@Override
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public int read() throws IOException {
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while (currentIndex == currentLength) {
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String line = readLine(in);
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if (line.equals("")) {
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return -1;
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}
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String[] parts = line.split(";", 2);
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currentLength = Integer.parseInt(parts[0], 16);
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currentSignature = parts[1];
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chunk = new byte[currentLength];
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currentIndex = 0;
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ByteStreams.readFully(in, chunk);
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// TODO: check currentSignature
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if (currentLength == 0) {
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return -1;
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}
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readLine(in);
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}
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return chunk[currentIndex++] & 0xFF;
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}
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@Override
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public int read(byte[] b, int off, int len) throws IOException {
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int i;
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for (i = 0; i < len; ++i) {
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int ch = read();
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if (ch == -1) {
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break;
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}
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b[off + i] = (byte) ch;
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}
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if (i == 0) {
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return -1;
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}
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return i;
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}
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/**
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* Read a \r\n terminated line from an InputStream.
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*
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* @return line without the newline or empty String if InputStream is empty
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*/
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private static String readLine(InputStream is) throws IOException {
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StringBuilder builder = new StringBuilder();
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while (true) {
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int ch = is.read();
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if (ch == '\r') {
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ch = is.read();
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if (ch == '\n') {
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break;
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} else {
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throw new IOException("unexpected char after \\r: " + ch);
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}
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} else if (ch == -1) {
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if (builder.length() > 0) {
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throw new IOException("unexpected end of stream");
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}
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break;
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}
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builder.append((char) ch);
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}
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return builder.toString();
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}
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}
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