private void encodeChunkedContent(
ChannelHandlerContext ctx, Object msg, int contentLength, List<Object> out) {
if (contentLength > 0) {
byte[] length = Integer.toHexString(contentLength).getBytes(CharsetUtil.US_ASCII);
ByteBuf buf = ctx.alloc().buffer(length.length + 2);
buf.writeBytes(length);
buf.writeBytes(CRLF);
out.add(buf);
out.add(encodeAndRetain(msg));
out.add(CRLF_BUF.duplicate());
}
if (msg instanceof LastHttpContent) {
HttpHeaders headers = ((LastHttpContent) msg).trailingHeaders();
if (headers.isEmpty()) {
out.add(ZERO_CRLF_CRLF_BUF.duplicate());
} else {
ByteBuf buf = ctx.alloc().buffer();
buf.writeBytes(ZERO_CRLF);
HttpHeaders.encode(headers, buf);
buf.writeBytes(CRLF);
out.add(buf);
}
state = ST_INIT;
} else {
if (contentLength == 0) {
// Need to produce some output otherwise an
// IllegalstateException will be thrown
out.add(EMPTY_BUFFER);
}
}
}
/**
* Sets the value of the {@code "Connection"} header depending on the protocol version of the
* specified message. This getMethod sets or removes the {@code "Connection"} header depending on
* what the default keep alive mode of the message's protocol version is, as specified by {@link
* HttpVersion#isKeepAliveDefault()}.
*
* <ul>
* <li>If the connection is kept alive by default:
* <ul>
* <li>set to {@code "close"} if {@code keepAlive} is {@code false}.
* <li>remove otherwise.
* </ul>
* <li>If the connection is closed by default:
* <ul>
* <li>set to {@code "keep-alive"} if {@code keepAlive} is {@code true}.
* <li>remove otherwise.
* </ul>
* </ul>
*/
public static void setKeepAlive(HttpMessage message, boolean keepAlive) {
HttpHeaders h = message.headers();
if (message.getProtocolVersion().isKeepAliveDefault()) {
if (keepAlive) {
h.remove(Names.CONNECTION);
} else {
h.set(Names.CONNECTION, Values.CLOSE);
}
} else {
if (keepAlive) {
h.set(Names.CONNECTION, Values.KEEP_ALIVE);
} else {
h.remove(Names.CONNECTION);
}
}
}
/**
* Returns the content length of the specified web socket message. If the specified message is not
* a web socket message, {@code -1} is returned.
*/
private static int getWebSocketContentLength(HttpMessage message) {
// WebSockset messages have constant content-lengths.
HttpHeaders h = message.headers();
if (message instanceof HttpRequest) {
HttpRequest req = (HttpRequest) message;
if (HttpMethod.GET.equals(req.getMethod())
&& h.contains(Names.SEC_WEBSOCKET_KEY1)
&& h.contains(Names.SEC_WEBSOCKET_KEY2)) {
return 8;
}
} else if (message instanceof HttpResponse) {
HttpResponse res = (HttpResponse) message;
if (res.getStatus().code() == 101
&& h.contains(Names.SEC_WEBSOCKET_ORIGIN)
&& h.contains(Names.SEC_WEBSOCKET_LOCATION)) {
return 16;
}
}
// Not a web socket message
return -1;
}
@Override
protected void encode(ChannelHandlerContext ctx, Object msg, List<Object> out) throws Exception {
ByteBuf buf = null;
if (msg instanceof HttpMessage) {
if (state != ST_INIT) {
throw new IllegalStateException(
"unexpected message type: " + StringUtil.simpleClassName(msg));
}
@SuppressWarnings({"unchecked", "CastConflictsWithInstanceof"})
H m = (H) msg;
buf = ctx.alloc().buffer();
// Encode the message.
encodeInitialLine(buf, m);
HttpHeaders.encode(m.headers(), buf);
buf.writeBytes(CRLF);
state = HttpHeaders.isTransferEncodingChunked(m) ? ST_CONTENT_CHUNK : ST_CONTENT_NON_CHUNK;
}
if (msg instanceof HttpContent || msg instanceof ByteBuf || msg instanceof FileRegion) {
if (state == ST_INIT) {
throw new IllegalStateException(
"unexpected message type: " + StringUtil.simpleClassName(msg));
}
int contentLength = contentLength(msg);
if (state == ST_CONTENT_NON_CHUNK) {
if (contentLength > 0) {
if (buf != null && buf.writableBytes() >= contentLength && msg instanceof HttpContent) {
// merge into other buffer for performance reasons
buf.writeBytes(((HttpContent) msg).content());
out.add(buf);
} else {
if (buf != null) {
out.add(buf);
}
out.add(encodeAndRetain(msg));
}
} else {
if (buf != null) {
out.add(buf);
} else {
// Need to produce some output otherwise an
// IllegalStateException will be thrown
out.add(EMPTY_BUFFER);
}
}
if (msg instanceof LastHttpContent) {
state = ST_INIT;
}
} else if (state == ST_CONTENT_CHUNK) {
if (buf != null) {
out.add(buf);
}
encodeChunkedContent(ctx, msg, contentLength, out);
} else {
throw new Error();
}
} else {
if (buf != null) {
out.add(buf);
}
}
}
@Deprecated
protected static void encodeAscii(String s, ByteBuf buf) {
HttpHeaders.encodeAscii0(s, buf);
}
@Override
protected void encode(ChannelHandlerContext ctx, HttpObject msg, ByteBuf out) throws Exception {
if (msg instanceof HttpMessage) {
if (state != ST_INIT) {
throw new IllegalStateException(
"unexpected message type: " + msg.getClass().getSimpleName());
}
@SuppressWarnings({"unchecked", "CastConflictsWithInstanceof"})
H m = (H) msg;
// Encode the message.
encodeInitialLine(out, m);
encodeHeaders(out, m);
out.writeByte(CR);
out.writeByte(LF);
state = HttpHeaders.isTransferEncodingChunked(m) ? ST_CONTENT_CHUNK : ST_CONTENT_NON_CHUNK;
}
if (msg instanceof HttpContent) {
if (state == ST_INIT) {
throw new IllegalStateException(
"unexpected message type: " + msg.getClass().getSimpleName());
}
HttpContent chunk = (HttpContent) msg;
ByteBuf content = chunk.content();
int contentLength = content.readableBytes();
if (state == ST_CONTENT_NON_CHUNK) {
if (contentLength > 0) {
out.writeBytes(content, content.readerIndex(), content.readableBytes());
}
if (chunk instanceof LastHttpContent) {
state = ST_INIT;
}
} else if (state == ST_CONTENT_CHUNK) {
if (contentLength > 0) {
out.writeBytes(copiedBuffer(Integer.toHexString(contentLength), CharsetUtil.US_ASCII));
out.writeByte(CR);
out.writeByte(LF);
out.writeBytes(content, content.readerIndex(), contentLength);
out.writeByte(CR);
out.writeByte(LF);
}
if (chunk instanceof LastHttpContent) {
out.writeByte((byte) '0');
out.writeByte(CR);
out.writeByte(LF);
encodeTrailingHeaders(out, (LastHttpContent) chunk);
out.writeByte(CR);
out.writeByte(LF);
state = ST_INIT;
}
} else {
throw new Error();
}
}
}