private State readHeaders(ChannelBuffer buffer) throws TooLongFrameException {
headerSize = 0;
String line = readHeader(buffer);
int match = 0;
String name = null;
String value = null;
boolean nameToInsert = false;
boolean hasContentLength = false;
if (line.length() != 0) {
do {
char firstChar = line.charAt(0);
if (name != null && (firstChar == ' ' || firstChar == '\t')) {
value = value + ' ' + line.trim();
} else {
if (name != null && nameToInsert) {
match++;
message.addHeader(name, value);
}
if (match < 3 && firstChar == 'C') {
if (line.startsWith("Connection: ")) {
name = "Connection";
value = line.substring(12);
nameToInsert = true;
} else if (line.startsWith("Cookie: ")) {
name = "Cookie";
value = line.substring(8);
nameToInsert = true;
} else if (line.startsWith("Content-Length: ")) {
name = "Content-Length";
value = line.substring(16);
nameToInsert = true;
hasContentLength = true;
} else {
nameToInsert = false;
}
}
}
line = readHeader(buffer);
} while (line.length() != 0);
// Add the last header.
if (name != null && nameToInsert) {
match++;
message.addHeader(name, value);
}
}
if (hasContentLength) {
return State.READ_FIXED_LENGTH_CONTENT;
} else {
return State.READ_VARIABLE_LENGTH_CONTENT;
}
}
private Object reset() {
HttpMessage message = this.message;
ChannelBuffer content = this.content;
if (content != null) {
message.setContent(content);
this.content = null;
}
this.message = null;
checkpoint(State.SKIP_CONTROL_CHARS);
return message;
}
private long getContentLength(HttpMessage message, int defaultValue) {
String value = message.getHeader("Content-Length");
if (FastIntegerParser.isNumber(value)) {
return FastIntegerParser.parseLong(value);
}
return defaultValue;
}
static boolean isTransferEncodingChunked(HttpMessage m) {
List<String> chunked = m.getHeaders(HttpHeaders.Names.TRANSFER_ENCODING);
if (chunked.isEmpty()) {
return false;
}
for (String v : chunked) {
if (v.equalsIgnoreCase(HttpHeaders.Values.CHUNKED)) {
return true;
}
}
return false;
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer, State state)
throws Exception {
switch (state) {
case SKIP_CONTROL_CHARS:
{
try {
skipControlCharacters(buffer);
checkpoint(State.READ_INITIAL);
} finally {
checkpoint();
}
}
case READ_INITIAL:
{
final String[] initialLine = splitInitialLine(readLine(buffer, maxInitialLineLength));
if (initialLine.length < 3) {
// Invalid initial line - ignore.
checkpoint(State.SKIP_CONTROL_CHARS);
return null;
}
message = createMessage(initialLine);
checkpoint(State.READ_HEADER);
}
case READ_HEADER:
{
State nextState = readHeaders(buffer);
checkpoint(nextState);
if (nextState == State.SKIP_CONTROL_CHARS) {
return message;
} else {
long contentLength = getContentLength(message, -1);
if (contentLength == 0 || contentLength == -1 && isDecodingRequest()) {
content = ChannelBuffers.EMPTY_BUFFER;
return reset();
}
switch (nextState) {
case READ_FIXED_LENGTH_CONTENT:
if (contentLength > maxChunkSize || HttpHeaders.is100ContinueExpected(message)) {
// Generate HttpMessage first. HttpChunks will follow.
checkpoint(State.READ_FIXED_LENGTH_CONTENT_AS_CHUNKS);
message.setChunked(true);
// chunkSize will be decreased as the READ_FIXED_LENGTH_CONTENT_AS_CHUNKS
// state reads data chunk by chunk.
chunkSize = getContentLength(message, -1);
return message;
}
break;
case READ_VARIABLE_LENGTH_CONTENT:
if (buffer.readableBytes() > maxChunkSize
|| HttpHeaders.is100ContinueExpected(message)) {
// Generate HttpMessage first. HttpChunks will follow.
checkpoint(State.READ_VARIABLE_LENGTH_CONTENT_AS_CHUNKS);
message.setChunked(true);
return message;
}
break;
default:
throw new IllegalStateException("Unexpected state: " + nextState);
}
}
// We return null here, this forces decode to be called again where we will decode the
// content
return null;
}
case READ_VARIABLE_LENGTH_CONTENT:
{
if (content == null) {
content = ChannelBuffers.dynamicBuffer(channel.getConfig().getBufferFactory());
}
// this will cause a replay error until the channel is closed where this will read what's
// left in the buffer
content.writeBytes(buffer.readBytes(buffer.readableBytes()));
return reset();
}
case READ_VARIABLE_LENGTH_CONTENT_AS_CHUNKS:
{
// Keep reading data as a chunk until the end of connection is reached.
int chunkSize = Math.min(maxChunkSize, buffer.readableBytes());
HttpChunk chunk = new DefaultHttpChunk(buffer.readBytes(chunkSize));
if (!buffer.readable()) {
// Reached to the end of the connection.
reset();
if (!chunk.isLast()) {
// Append the last chunk.
return new Object[] {chunk, HttpChunk.LAST_CHUNK};
}
}
return chunk;
}
case READ_FIXED_LENGTH_CONTENT:
{
// we have a content-length so we just read the correct number of bytes
readFixedLengthContent(buffer);
return reset();
}
case READ_FIXED_LENGTH_CONTENT_AS_CHUNKS:
{
long chunkSize = this.chunkSize;
HttpChunk chunk;
if (chunkSize > maxChunkSize) {
chunk = new DefaultHttpChunk(buffer.readBytes(maxChunkSize));
chunkSize -= maxChunkSize;
} else {
assert chunkSize <= Integer.MAX_VALUE;
chunk = new DefaultHttpChunk(buffer.readBytes((int) chunkSize));
chunkSize = 0;
}
this.chunkSize = chunkSize;
if (chunkSize == 0) {
// Read all content.
reset();
if (!chunk.isLast()) {
// Append the last chunk.
return new Object[] {chunk, HttpChunk.LAST_CHUNK};
}
}
return chunk;
}
/**
* everything else after this point takes care of reading chunked content. basically, read
* chunk size, read chunk, read and ignore the CRLF and repeat until 0
*/
case READ_CHUNK_SIZE:
{
String line = readLine(buffer, maxInitialLineLength);
int chunkSize = getChunkSize(line);
this.chunkSize = chunkSize;
if (chunkSize == 0) {
checkpoint(State.READ_CHUNK_FOOTER);
return null;
} else if (chunkSize > maxChunkSize) {
// A chunk is too large. Split them into multiple chunks again.
checkpoint(State.READ_CHUNKED_CONTENT_AS_CHUNKS);
} else {
checkpoint(State.READ_CHUNKED_CONTENT);
}
}
case READ_CHUNKED_CONTENT:
{
assert chunkSize <= Integer.MAX_VALUE;
HttpChunk chunk = new DefaultHttpChunk(buffer.readBytes((int) chunkSize));
checkpoint(State.READ_CHUNK_DELIMITER);
return chunk;
}
case READ_CHUNKED_CONTENT_AS_CHUNKS:
{
long chunkSize = this.chunkSize;
HttpChunk chunk;
if (chunkSize > maxChunkSize) {
chunk = new DefaultHttpChunk(buffer.readBytes(maxChunkSize));
chunkSize -= maxChunkSize;
} else {
assert chunkSize <= Integer.MAX_VALUE;
chunk = new DefaultHttpChunk(buffer.readBytes((int) chunkSize));
chunkSize = 0;
}
this.chunkSize = chunkSize;
if (chunkSize == 0) {
// Read all content.
checkpoint(State.READ_CHUNK_DELIMITER);
}
if (!chunk.isLast()) {
return chunk;
}
}
case READ_CHUNK_DELIMITER:
{
for (; ; ) {
byte next = buffer.readByte();
if (next == HttpCodecUtil.CR) {
if (buffer.readByte() == HttpCodecUtil.LF) {
checkpoint(State.READ_CHUNK_SIZE);
return null;
}
} else if (next == HttpCodecUtil.LF) {
checkpoint(State.READ_CHUNK_SIZE);
return null;
}
}
}
case READ_CHUNK_FOOTER:
{
HttpChunkTrailer trailer = readTrailingHeaders(buffer);
if (maxChunkSize == 0) {
// Chunked encoding disabled.
return reset();
} else {
reset();
// The last chunk, which is empty
return trailer;
}
}
default:
{
throw new Error("Shouldn't reach here.");
}
}
}
private long getContentLength(HttpMessage message) {
return FastIntegerParser.parseInt(message.getHeader("Content-Length"));
}
public static void setContentLength(HttpMessage message, long contentLength) {
message.setHeader(HttpHeaders.Names.CONTENT_LENGTH, String.valueOf(contentLength));
}
public static boolean isKeepAlive(HttpMessage message) {
return HttpHeaders.isKeepAlive(message)
&& message.getProtocolVersion().equals(HttpVersion.HTTP_1_1);
}