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HttpObjectDecoder ignores HTTP trailer header when empty line is rece… (#8799)

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* HttpObjectDecoder ignores HTTP trailer header when empty line is received in seperate ByteBuf

Motivation:

When the empty line that termines the trailers was sent in a seperate ByteBuf we did ignore the previous parsed trailers and just returned none.

Modifications:

- Correct respect previous parsed trailers.
- Add unit test.

Result:

Fixes https://github.com/netty/netty/issues/8736
This commit is contained in:
Norman Maurer 2019-01-31 20:27:47 +01:00
parent ab0c33adff
commit 9725cae033
2 changed files with 71 additions and 41 deletions
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83
codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java
View File

@ -633,49 +633,50 @@ public abstract class HttpObjectDecoder extends ByteToMessageDecoder {
if (line == null) {
return null;
}
CharSequence lastHeader = null;
if (line.length() > 0) {
LastHttpContent trailer = this.trailer;
if (trailer == null) {
trailer = this.trailer = new DefaultLastHttpContent(Unpooled.EMPTY_BUFFER, validateHeaders);
}
do {
char firstChar = line.charAt(0);
if (lastHeader != null && (firstChar == ' ' || firstChar == '\t')) {
List<String> current = trailer.trailingHeaders().getAll(lastHeader);
if (!current.isEmpty()) {
int lastPos = current.size() - 1;
//please do not make one line from below code
//as it breaks +XX:OptimizeStringConcat optimization
String lineTrimmed = line.toString().trim();
String currentLastPos = current.get(lastPos);
current.set(lastPos, currentLastPos + lineTrimmed);
}
} else {
splitHeader(line);
CharSequence headerName = name;
if (!HttpHeaderNames.CONTENT_LENGTH.contentEqualsIgnoreCase(headerName) &&
!HttpHeaderNames.TRANSFER_ENCODING.contentEqualsIgnoreCase(headerName) &&
!HttpHeaderNames.TRAILER.contentEqualsIgnoreCase(headerName)) {
trailer.trailingHeaders().add(headerName, value);
}
lastHeader = name;
// reset name and value fields
name = null;
value = null;
}
line = headerParser.parse(buffer);
if (line == null) {
return null;
}
} while (line.length() > 0);
this.trailer = null;
return trailer;
LastHttpContent trailer = this.trailer;
if (line.length() == 0 && trailer == null) {
// We have received the empty line which signals the trailer is complete and did not parse any trailers
// before. Just return an empty last content to reduce allocations.
return LastHttpContent.EMPTY_LAST_CONTENT;
}
return LastHttpContent.EMPTY_LAST_CONTENT;
CharSequence lastHeader = null;
if (trailer == null) {
trailer = this.trailer = new DefaultLastHttpContent(Unpooled.EMPTY_BUFFER, validateHeaders);
}
while (line.length() > 0) {
char firstChar = line.charAt(0);
if (lastHeader != null && (firstChar == ' ' || firstChar == '\t')) {
List<String> current = trailer.trailingHeaders().getAll(lastHeader);
if (!current.isEmpty()) {
int lastPos = current.size() - 1;
//please do not make one line from below code
//as it breaks +XX:OptimizeStringConcat optimization
String lineTrimmed = line.toString().trim();
String currentLastPos = current.get(lastPos);
current.set(lastPos, currentLastPos + lineTrimmed);
}
} else {
splitHeader(line);
CharSequence headerName = name;
if (!HttpHeaderNames.CONTENT_LENGTH.contentEqualsIgnoreCase(headerName) &&
!HttpHeaderNames.TRANSFER_ENCODING.contentEqualsIgnoreCase(headerName) &&
!HttpHeaderNames.TRAILER.contentEqualsIgnoreCase(headerName)) {
trailer.trailingHeaders().add(headerName, value);
}
lastHeader = name;
// reset name and value fields
name = null;
value = null;
}
line = headerParser.parse(buffer);
if (line == null) {
return null;
}
}
this.trailer = null;
return trailer;
}
protected abstract boolean isDecodingRequest();

29
codec-http/src/test/java/io/netty/handler/codec/http/HttpResponseDecoderTest.java
View File

@ -634,4 +634,33 @@ public class HttpResponseDecoderTest {
assertThat(message.decoderResult().cause(), instanceOf(PrematureChannelClosureException.class));
assertNull(channel.readInbound());
}
@Test
public void testTrailerWithEmptyLineInSeparateBuffer() {
HttpResponseDecoder decoder = new HttpResponseDecoder();
EmbeddedChannel channel = new EmbeddedChannel(decoder);
String headers = "HTTP/1.1 200 OK\r\n"
+ "Transfer-Encoding: chunked\r\n"
+ "Trailer: My-Trailer\r\n";
assertFalse(channel.writeInbound(Unpooled.copiedBuffer(headers.getBytes(CharsetUtil.US_ASCII))));
assertTrue(channel.writeInbound(Unpooled.copiedBuffer("\r\n".getBytes(CharsetUtil.US_ASCII))));
assertTrue(channel.writeInbound(Unpooled.copiedBuffer("0\r\n", CharsetUtil.US_ASCII)));
assertTrue(channel.writeInbound(Unpooled.copiedBuffer("My-Trailer: 42\r\n", CharsetUtil.US_ASCII)));
assertTrue(channel.writeInbound(Unpooled.copiedBuffer("\r\n", CharsetUtil.US_ASCII)));
HttpResponse response = channel.readInbound();
assertEquals(2, response.headers().size());
assertEquals("chunked", response.headers().get(HttpHeaderNames.TRANSFER_ENCODING));
assertEquals("My-Trailer", response.headers().get(HttpHeaderNames.TRAILER));
LastHttpContent lastContent = channel.readInbound();
assertEquals(1, lastContent.trailingHeaders().size());
assertEquals("42", lastContent.trailingHeaders().get("My-Trailer"));
assertEquals(0, lastContent.content().readableBytes());
lastContent.release();
assertFalse(channel.finish());
}
}