| /**************************************************************** |
| * 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.james.imapserver.netty; |
| |
| import java.io.Closeable; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.james.imap.api.display.HumanReadableText; |
| import org.apache.james.imap.decode.DecodingException; |
| import org.apache.james.imap.message.Literal; |
| import org.apache.james.imap.utils.EolInputStream; |
| |
| import com.github.fge.lambdas.Throwing; |
| import com.google.common.io.ByteStreams; |
| import com.google.common.io.CountingInputStream; |
| |
| import io.netty.channel.Channel; |
| import reactor.core.publisher.Mono; |
| import reactor.core.scheduler.Schedulers; |
| |
| public class NettyStreamImapRequestLineReader extends AbstractNettyImapRequestLineReader implements Closeable { |
| private static class FileLiteral implements Literal, Closeable { |
| private final long offset; |
| private final int size; |
| private final boolean extraCRLF; |
| private final ImapRequestFrameDecoder.FileHolder file; |
| private final AbstractNettyImapRequestLineReader reader; |
| |
| private FileLiteral(long offset, int size, boolean extraCRLF, ImapRequestFrameDecoder.FileHolder file, AbstractNettyImapRequestLineReader reader) { |
| this.offset = offset; |
| this.size = size; |
| this.extraCRLF = extraCRLF; |
| this.file = file; |
| this.reader = reader; |
| } |
| |
| @Override |
| public void close() { |
| Mono.fromRunnable(Throwing.runnable(() -> { |
| file.dispose(); |
| reader.close(); |
| })) |
| .subscribeOn(Schedulers.boundedElastic()) |
| .subscribe(); |
| } |
| |
| @Override |
| public long size() { |
| return Math.min(file.getFile().length() - offset, size); |
| } |
| |
| @Override |
| public InputStream getInputStream() throws IOException { |
| FileInputStream fileInputStream = new FileInputStream(file.getFile()); |
| fileInputStream.skip(offset); |
| InputStream limitedStream = ByteStreams.limit(fileInputStream, size); |
| if (extraCRLF) { |
| return new EolInputStream(reader, limitedStream); |
| } else { |
| return limitedStream; |
| } |
| } |
| } |
| |
| private final ImapRequestFrameDecoder.FileHolder backingFile; |
| private final CountingInputStream in; |
| |
| public NettyStreamImapRequestLineReader(Channel channel, ImapRequestFrameDecoder.FileHolder file, boolean retry) { |
| super(channel, retry); |
| this.backingFile = file; |
| try { |
| this.in = new CountingInputStream(new FileInputStream(file.getFile())); |
| } catch (FileNotFoundException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| /** |
| * Reads the next character in the current line. This method will continue |
| * to return the same character until the {@link #consume()} method is |
| * called. |
| * |
| * @return The next character TODO: character encoding is variable and |
| * cannot be determine at the token level; this char is not accurate |
| * reported; should be an octet |
| * @throws DecodingException |
| * If the end-of-stream is reached. |
| */ |
| @Override |
| public char nextChar() throws DecodingException { |
| if (!nextSeen) { |
| int next; |
| try { |
| next = in.read(); |
| } catch (IOException e) { |
| throw new DecodingException(HumanReadableText.SOCKET_IO_FAILURE, "Error reading from stream.", e); |
| } |
| if (next == -1) { |
| throw new DecodingException(HumanReadableText.ILLEGAL_ARGUMENTS, "Unexpected end of stream."); |
| } |
| nextSeen = true; |
| nextChar = (char) next; |
| } |
| |
| return nextChar; |
| |
| } |
| |
| /** |
| * Reads and consumes a number of characters from the underlying reader, |
| * filling the char array provided. |
| * |
| * @param size |
| * number of characters to read and consume |
| * @param extraCRLF |
| * Add extra CRLF |
| * @throws DecodingException |
| * If a char can't be read into each array element. |
| */ |
| @Override |
| public Literal read(int size, boolean extraCRLF) throws DecodingException { |
| |
| // Unset the next char. |
| nextSeen = false; |
| nextChar = 0; |
| |
| try { |
| long offset = in.getCount(); |
| in.skip(size); |
| return new FileLiteral(offset, size, extraCRLF, backingFile, this); |
| } catch (IOException e) { |
| throw new DecodingException(HumanReadableText.SOCKET_IO_FAILURE, "Could not copy litteral", e); |
| } |
| } |
| |
| @Override |
| public void close() throws IOException { |
| in.close(); |
| } |
| |
| } |