/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed 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 com.squareup.okhttp.internal.spdy;
import com.squareup.okhttp.internal.Platform;
import com.squareup.okhttp.internal.Util;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.ProtocolException;
import java.util.List;
import java.util.zip.Deflater;
final class Spdy3 implements Variant {
static final int TYPE_DATA = 0x0;
static final int TYPE_SYN_STREAM = 0x1;
static final int TYPE_SYN_REPLY = 0x2;
static final int TYPE_RST_STREAM = 0x3;
static final int TYPE_SETTINGS = 0x4;
static final int TYPE_NOOP = 0x5;
static final int TYPE_PING = 0x6;
static final int TYPE_GOAWAY = 0x7;
static final int TYPE_HEADERS = 0x8;
static final int TYPE_WINDOW_UPDATE = 0x9;
static final int TYPE_CREDENTIAL = 0x10;
static final int FLAG_FIN = 0x1;
static final int FLAG_UNIDIRECTIONAL = 0x2;
static final int VERSION = 3;
static final byte[] DICTIONARY;
static {
try {
DICTIONARY = ("\u0000\u0000\u0000\u0007options\u0000\u0000\u0000\u0004hea"
+ "d\u0000\u0000\u0000\u0004post\u0000\u0000\u0000\u0003put\u0000\u0000\u0000\u0006dele"
+ "te\u0000\u0000\u0000\u0005trace\u0000\u0000\u0000\u0006accept\u0000\u0000\u0000"
+ "\u000Eaccept-charset\u0000\u0000\u0000\u000Faccept-encoding\u0000\u0000\u0000\u000Fa"
+ "ccept-language\u0000\u0000\u0000\raccept-ranges\u0000\u0000\u0000\u0003age\u0000"
+ "\u0000\u0000\u0005allow\u0000\u0000\u0000\rauthorization\u0000\u0000\u0000\rcache-co"
+ "ntrol\u0000\u0000\u0000\nconnection\u0000\u0000\u0000\fcontent-base\u0000\u0000"
+ "\u0000\u0010content-encoding\u0000\u0000\u0000\u0010content-language\u0000\u0000"
+ "\u0000\u000Econtent-length\u0000\u0000\u0000\u0010content-location\u0000\u0000\u0000"
+ "\u000Bcontent-md5\u0000\u0000\u0000\rcontent-range\u0000\u0000\u0000\fcontent-type"
+ "\u0000\u0000\u0000\u0004date\u0000\u0000\u0000\u0004etag\u0000\u0000\u0000\u0006expe"
+ "ct\u0000\u0000\u0000\u0007expires\u0000\u0000\u0000\u0004from\u0000\u0000\u0000"
+ "\u0004host\u0000\u0000\u0000\bif-match\u0000\u0000\u0000\u0011if-modified-since"
+ "\u0000\u0000\u0000\rif-none-match\u0000\u0000\u0000\bif-range\u0000\u0000\u0000"
+ "\u0013if-unmodified-since\u0000\u0000\u0000\rlast-modified\u0000\u0000\u0000\blocati"
+ "on\u0000\u0000\u0000\fmax-forwards\u0000\u0000\u0000\u0006pragma\u0000\u0000\u0000"
+ "\u0012proxy-authenticate\u0000\u0000\u0000\u0013proxy-authorization\u0000\u0000"
+ "\u0000\u0005range\u0000\u0000\u0000\u0007referer\u0000\u0000\u0000\u000Bretry-after"
+ "\u0000\u0000\u0000\u0006server\u0000\u0000\u0000\u0002te\u0000\u0000\u0000\u0007trai"
+ "ler\u0000\u0000\u0000\u0011transfer-encoding\u0000\u0000\u0000\u0007upgrade\u0000"
+ "\u0000\u0000\nuser-agent\u0000\u0000\u0000\u0004vary\u0000\u0000\u0000\u0003via"
+ "\u0000\u0000\u0000\u0007warning\u0000\u0000\u0000\u0010www-authenticate\u0000\u0000"
+ "\u0000\u0006method\u0000\u0000\u0000\u0003get\u0000\u0000\u0000\u0006status\u0000"
+ "\u0000\u0000\u0006200 OK\u0000\u0000\u0000\u0007version\u0000\u0000\u0000\bHTTP/1.1"
+ "\u0000\u0000\u0000\u0003url\u0000\u0000\u0000\u0006public\u0000\u0000\u0000\nset-coo"
+ "kie\u0000\u0000\u0000\nkeep-alive\u0000\u0000\u0000\u0006origin100101201202205206300"
+ "302303304305306307402405406407408409410411412413414415416417502504505203 Non-Authori"
+ "tative Information204 No Content301 Moved Permanently400 Bad Request401 Unauthorized"
+ "403 Forbidden404 Not Found500 Internal Server Error501 Not Implemented503 Service Un"
+ "availableJan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec 00:00:00 Mon, Tue, Wed, Th"
+ "u, Fri, Sat, Sun, GMTchunked,text/html,image/png,image/jpg,image/gif,application/xml"
+ ",application/xhtml+xml,text/plain,text/javascript,publicprivatemax-age=gzip,deflate,"
+ "sdchcharset=utf-8charset=iso-8859-1,utf-,*,enq=0.").getBytes(Util.UTF_8.name());
} catch (UnsupportedEncodingException e) {
throw new AssertionError();
}
}
@Override public FrameReader newReader(InputStream in, boolean client) {
return new Reader(in, client);
}
@Override public FrameWriter newWriter(OutputStream out, boolean client) {
return new Writer(out, client);
}
/** Read spdy/3 frames. */
static final class Reader implements FrameReader {
private final DataInputStream in;
private final boolean client;
private final NameValueBlockReader nameValueBlockReader;
Reader(InputStream in, boolean client) {
this.in = new DataInputStream(in);
this.nameValueBlockReader = new NameValueBlockReader(in);
this.client = client;
}
@Override public void readConnectionHeader() {
}
/**
* Send the next frame to {@code handler}. Returns true unless there are no
* more frames on the stream.
*/
@Override public boolean nextFrame(Handler handler) throws IOException {
int w1;
try {
w1 = in.readInt();
} catch (IOException e) {
return false; // This might be a normal socket close.
}
int w2 = in.readInt();
boolean control = (w1 & 0x80000000) != 0;
int flags = (w2 & 0xff000000) >>> 24;
int length = (w2 & 0xffffff);
if (control) {
int version = (w1 & 0x7fff0000) >>> 16;
int type = (w1 & 0xffff);
if (version != 3) {
throw new ProtocolException("version != 3: " + version);
}
switch (type) {
case TYPE_SYN_STREAM:
readSynStream(handler, flags, length);
return true;
case TYPE_SYN_REPLY:
readSynReply(handler, flags, length);
return true;
case TYPE_RST_STREAM:
readRstStream(handler, flags, length);
return true;
case TYPE_SETTINGS:
readSettings(handler, flags, length);
return true;
case TYPE_NOOP:
if (length != 0) throw ioException("TYPE_NOOP length: %d != 0", length);
handler.noop();
return true;
case TYPE_PING:
readPing(handler, flags, length);
return true;
case TYPE_GOAWAY:
readGoAway(handler, flags, length);
return true;
case TYPE_HEADERS:
readHeaders(handler, flags, length);
return true;
case TYPE_WINDOW_UPDATE:
readWindowUpdate(handler, flags, length);
return true;
case TYPE_CREDENTIAL:
Util.skipByReading(in, length);
throw new UnsupportedOperationException("TODO"); // TODO: implement
default:
throw new IOException("Unexpected frame");
}
} else {
int streamId = w1 & 0x7fffffff;
boolean inFinished = (flags & FLAG_FIN) != 0;
handler.data(inFinished, streamId, in, length);
return true;
}
}
private void readSynStream(Handler handler, int flags, int length) throws IOException {
int w1 = in.readInt();
int w2 = in.readInt();
int s3 = in.readShort();
int streamId = w1 & 0x7fffffff;
int associatedStreamId = w2 & 0x7fffffff;
int priority = (s3 & 0xe000) >>> 13;
int slot = s3 & 0xff;
List<String> nameValueBlock = nameValueBlockReader.readNameValueBlock(length - 10);
boolean inFinished = (flags & FLAG_FIN) != 0;
boolean outFinished = (flags & FLAG_UNIDIRECTIONAL) != 0;
handler.headers(outFinished, inFinished, streamId, associatedStreamId, priority,
nameValueBlock, HeadersMode.SPDY_SYN_STREAM);
}
private void readSynReply(Handler handler, int flags, int length) throws IOException {
int w1 = in.readInt();
int streamId = w1 & 0x7fffffff;
List<String> nameValueBlock = nameValueBlockReader.readNameValueBlock(length - 4);
boolean inFinished = (flags & FLAG_FIN) != 0;
handler.headers(false, inFinished, streamId, -1, -1, nameValueBlock, HeadersMode.SPDY_REPLY);
}
private void readRstStream(Handler handler, int flags, int length) throws IOException {
if (length != 8) throw ioException("TYPE_RST_STREAM length: %d != 8", length);
int streamId = in.readInt() & 0x7fffffff;
int errorCodeInt = in.readInt();
ErrorCode errorCode = ErrorCode.fromSpdy3Rst(errorCodeInt);
if (errorCode == null) {
throw ioException("TYPE_RST_STREAM unexpected error code: %d", errorCodeInt);
}
handler.rstStream(streamId, errorCode);
}
private void readHeaders(Handler handler, int flags, int length) throws IOException {
int w1 = in.readInt();
int streamId = w1 & 0x7fffffff;
List<String> nameValueBlock = nameValueBlockReader.readNameValueBlock(length - 4);
handler.headers(false, false, streamId, -1, -1, nameValueBlock, HeadersMode.SPDY_HEADERS);
}
private void readWindowUpdate(Handler handler, int flags, int length) throws IOException {
if (length != 8) throw ioException("TYPE_WINDOW_UPDATE length: %d != 8", length);
int w1 = in.readInt();
int w2 = in.readInt();
int streamId = w1 & 0x7fffffff;
int deltaWindowSize = w2 & 0x7fffffff;
handler.windowUpdate(streamId, deltaWindowSize, false);
}
private void readPing(Handler handler, int flags, int length) throws IOException {
if (length != 4) throw ioException("TYPE_PING length: %d != 4", length);
int id = in.readInt();
boolean reply = client == ((id % 2) == 1);
handler.ping(reply, id, 0);
}
private void readGoAway(Handler handler, int flags, int length) throws IOException {
if (length != 8) throw ioException("TYPE_GOAWAY length: %d != 8", length);
int lastGoodStreamId = in.readInt() & 0x7fffffff;
int errorCodeInt = in.readInt();
ErrorCode errorCode = ErrorCode.fromSpdyGoAway(errorCodeInt);
if (errorCode == null) {
throw ioException("TYPE_GOAWAY unexpected error code: %d", errorCodeInt);
}
handler.goAway(lastGoodStreamId, errorCode);
}
private void readSettings(Handler handler, int flags, int length) throws IOException {
int numberOfEntries = in.readInt();
if (length != 4 + 8 * numberOfEntries) {
throw ioException("TYPE_SETTINGS length: %d != 4 + 8 * %d", length, numberOfEntries);
}
Settings settings = new Settings();
for (int i = 0; i < numberOfEntries; i++) {
int w1 = in.readInt();
int value = in.readInt();
int idFlags = (w1 & 0xff000000) >>> 24;
int id = w1 & 0xffffff;
settings.set(id, idFlags, value);
}
boolean clearPrevious = (flags & Settings.FLAG_CLEAR_PREVIOUSLY_PERSISTED_SETTINGS) != 0;
handler.settings(clearPrevious, settings);
}
private static IOException ioException(String message, Object... args) throws IOException {
throw new IOException(String.format(message, args));
}
@Override public void close() throws IOException {
Util.closeAll(in, nameValueBlockReader);
}
}
/** Write spdy/3 frames. */
static final class Writer implements FrameWriter {
private final DataOutputStream out;
private final ByteArrayOutputStream nameValueBlockBuffer;
private final DataOutputStream nameValueBlockOut;
private final boolean client;
Writer(OutputStream out, boolean client) {
this.out = new DataOutputStream(out);
this.client = client;
Deflater deflater = new Deflater();
deflater.setDictionary(DICTIONARY);
nameValueBlockBuffer = new ByteArrayOutputStream();
nameValueBlockOut = new DataOutputStream(
Platform.get().newDeflaterOutputStream(nameValueBlockBuffer, deflater, true));
}
@Override public synchronized void connectionHeader() {
// Do nothing: no connection header for SPDY/3.
}
@Override public synchronized void flush() throws IOException {
out.flush();
}
@Override public synchronized void synStream(boolean outFinished, boolean inFinished,
int streamId, int associatedStreamId, int priority, int slot, List<String> nameValueBlock)
throws IOException {
writeNameValueBlockToBuffer(nameValueBlock);
int length = 10 + nameValueBlockBuffer.size();
int type = TYPE_SYN_STREAM;
int flags = (outFinished ? FLAG_FIN : 0) | (inFinished ? FLAG_UNIDIRECTIONAL : 0);
int unused = 0;
out.writeInt(0x80000000 | (VERSION & 0x7fff) << 16 | type & 0xffff);
out.writeInt((flags & 0xff) << 24 | length & 0xffffff);
out.writeInt(streamId & 0x7fffffff);
out.writeInt(associatedStreamId & 0x7fffffff);
out.writeShort((priority & 0x7) << 13 | (unused & 0x1f) << 8 | (slot & 0xff));
nameValueBlockBuffer.writeTo(out);
out.flush();
}
@Override public synchronized void synReply(
boolean outFinished, int streamId, List<String> nameValueBlock) throws IOException {
writeNameValueBlockToBuffer(nameValueBlock);
int type = TYPE_SYN_REPLY;
int flags = (outFinished ? FLAG_FIN : 0);
int length = nameValueBlockBuffer.size() + 4;
out.writeInt(0x80000000 | (VERSION & 0x7fff) << 16 | type & 0xffff);
out.writeInt((flags & 0xff) << 24 | length & 0xffffff);
out.writeInt(streamId & 0x7fffffff);
nameValueBlockBuffer.writeTo(out);
out.flush();
}
@Override public synchronized void headers(int streamId, List<String> nameValueBlock)
throws IOException {
writeNameValueBlockToBuffer(nameValueBlock);
int flags = 0;
int type = TYPE_HEADERS;
int length = nameValueBlockBuffer.size() + 4;
out.writeInt(0x80000000 | (VERSION & 0x7fff) << 16 | type & 0xffff);
out.writeInt((flags & 0xff) << 24 | length & 0xffffff);
out.writeInt(streamId & 0x7fffffff);
nameValueBlockBuffer.writeTo(out);
out.flush();
}
@Override public synchronized void rstStream(int streamId, ErrorCode errorCode)
throws IOException {
if (errorCode.spdyRstCode == -1) throw new IllegalArgumentException();
int flags = 0;
int type = TYPE_RST_STREAM;
int length = 8;
out.writeInt(0x80000000 | (VERSION & 0x7fff) << 16 | type & 0xffff);
out.writeInt((flags & 0xff) << 24 | length & 0xffffff);
out.writeInt(streamId & 0x7fffffff);
out.writeInt(errorCode.spdyRstCode);
out.flush();
}
@Override public synchronized void data(boolean outFinished, int streamId, byte[] data)
throws IOException {
data(outFinished, streamId, data, 0, data.length);
}
@Override public synchronized void data(boolean outFinished, int streamId, byte[] data,
int offset, int byteCount) throws IOException {
int flags = (outFinished ? FLAG_FIN : 0);
out.writeInt(streamId & 0x7fffffff);
out.writeInt((flags & 0xff) << 24 | byteCount & 0xffffff);
out.write(data, offset, byteCount);
}
private void writeNameValueBlockToBuffer(List<String> nameValueBlock) throws IOException {
nameValueBlockBuffer.reset();
int numberOfPairs = nameValueBlock.size() / 2;
nameValueBlockOut.writeInt(numberOfPairs);
for (String s : nameValueBlock) {
nameValueBlockOut.writeInt(s.length());
nameValueBlockOut.write(s.getBytes("UTF-8"));
}
nameValueBlockOut.flush();
}
@Override public synchronized void settings(Settings settings) throws IOException {
int type = TYPE_SETTINGS;
int flags = 0;
int size = settings.size();
int length = 4 + size * 8;
out.writeInt(0x80000000 | (VERSION & 0x7fff) << 16 | type & 0xffff);
out.writeInt((flags & 0xff) << 24 | length & 0xffffff);
out.writeInt(size);
for (int i = 0; i <= Settings.COUNT; i++) {
if (!settings.isSet(i)) continue;
int settingsFlags = settings.flags(i);
out.writeInt((settingsFlags & 0xff) << 24 | (i & 0xffffff));
out.writeInt(settings.get(i));
}
out.flush();
}
@Override public synchronized void noop() throws IOException {
int type = TYPE_NOOP;
int length = 0;
int flags = 0;
out.writeInt(0x80000000 | (VERSION & 0x7fff) << 16 | type & 0xffff);
out.writeInt((flags & 0xff) << 24 | length & 0xffffff);
out.flush();
}
@Override public synchronized void ping(boolean reply, int payload1, int payload2)
throws IOException {
boolean payloadIsReply = client != ((payload1 % 2) == 1);
if (reply != payloadIsReply) throw new IllegalArgumentException("payload != reply");
int type = TYPE_PING;
int flags = 0;
int length = 4;
out.writeInt(0x80000000 | (VERSION & 0x7fff) << 16 | type & 0xffff);
out.writeInt((flags & 0xff) << 24 | length & 0xffffff);
out.writeInt(payload1);
out.flush();
}
@Override public synchronized void goAway(int lastGoodStreamId, ErrorCode errorCode)
throws IOException {
if (errorCode.spdyGoAwayCode == -1) throw new IllegalArgumentException();
int type = TYPE_GOAWAY;
int flags = 0;
int length = 8;
out.writeInt(0x80000000 | (VERSION & 0x7fff) << 16 | type & 0xffff);
out.writeInt((flags & 0xff) << 24 | length & 0xffffff);
out.writeInt(lastGoodStreamId);
out.writeInt(errorCode.spdyGoAwayCode);
out.flush();
}
@Override public synchronized void windowUpdate(int streamId, int deltaWindowSize)
throws IOException {
int type = TYPE_WINDOW_UPDATE;
int flags = 0;
int length = 8;
out.writeInt(0x80000000 | (VERSION & 0x7fff) << 16 | type & 0xffff);
out.writeInt((flags & 0xff) << 24 | length & 0xffffff);
out.writeInt(streamId);
out.writeInt(deltaWindowSize);
out.flush();
}
@Override public void close() throws IOException {
Util.closeAll(out, nameValueBlockOut);
}
}
}