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/*
* 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 libthrift091.protocol;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.Stack;
import libthrift091.TByteArrayOutputStream;
import libthrift091.TException;
import libthrift091.transport.TTransport;
/**
* JSON protocol implementation for thrift.
*
* This is a full-featured protocol supporting write and read.
*
* Please see the C++ class header for a detailed description of the
* protocol's wire format.
*
*/
public class TJSONProtocol extends TProtocol {
/**
* Factory for JSON protocol objects
*/
public static class Factory implements TProtocolFactory {
public TProtocol getProtocol(TTransport trans) {
return new TJSONProtocol(trans);
}
}
private static final byte[] COMMA = new byte[] {','};
private static final byte[] COLON = new byte[] {':'};
private static final byte[] LBRACE = new byte[] {'{'};
private static final byte[] RBRACE = new byte[] {'}'};
private static final byte[] LBRACKET = new byte[] {'['};
private static final byte[] RBRACKET = new byte[] {']'};
private static final byte[] QUOTE = new byte[] {'"'};
private static final byte[] BACKSLASH = new byte[] {'\\'};
private static final byte[] ZERO = new byte[] {'0'};
private static final byte[] ESCSEQ = new byte[] {'\\','u','0','0'};
private static final long VERSION = 1;
private static final byte[] JSON_CHAR_TABLE = {
/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
0, 0, 0, 0, 0, 0, 0, 0,'b','t','n', 0,'f','r', 0, 0, // 0
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 1
1, 1,'"', 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 2
};
private static final String ESCAPE_CHARS = "\"\\bfnrt";
private static final byte[] ESCAPE_CHAR_VALS = {
'"', '\\', '\b', '\f', '\n', '\r', '\t',
};
private static final int DEF_STRING_SIZE = 16;
private static final byte[] NAME_BOOL = new byte[] {'t', 'f'};
private static final byte[] NAME_BYTE = new byte[] {'i','8'};
private static final byte[] NAME_I16 = new byte[] {'i','1','6'};
private static final byte[] NAME_I32 = new byte[] {'i','3','2'};
private static final byte[] NAME_I64 = new byte[] {'i','6','4'};
private static final byte[] NAME_DOUBLE = new byte[] {'d','b','l'};
private static final byte[] NAME_STRUCT = new byte[] {'r','e','c'};
private static final byte[] NAME_STRING = new byte[] {'s','t','r'};
private static final byte[] NAME_MAP = new byte[] {'m','a','p'};
private static final byte[] NAME_LIST = new byte[] {'l','s','t'};
private static final byte[] NAME_SET = new byte[] {'s','e','t'};
private static final TStruct ANONYMOUS_STRUCT = new TStruct();
private static final byte[] getTypeNameForTypeID(byte typeID)
throws TException {
switch (typeID) {
case TType.BOOL:
return NAME_BOOL;
case TType.BYTE:
return NAME_BYTE;
case TType.I16:
return NAME_I16;
case TType.I32:
return NAME_I32;
case TType.I64:
return NAME_I64;
case TType.DOUBLE:
return NAME_DOUBLE;
case TType.STRING:
return NAME_STRING;
case TType.STRUCT:
return NAME_STRUCT;
case TType.MAP:
return NAME_MAP;
case TType.SET:
return NAME_SET;
case TType.LIST:
return NAME_LIST;
default:
throw new TProtocolException(TProtocolException.NOT_IMPLEMENTED,
"Unrecognized type");
}
}
private static final byte getTypeIDForTypeName(byte[] name)
throws TException {
byte result = TType.STOP;
if (name.length > 1) {
switch (name[0]) {
case 'd':
result = TType.DOUBLE;
break;
case 'i':
switch (name[1]) {
case '8':
result = TType.BYTE;
break;
case '1':
result = TType.I16;
break;
case '3':
result = TType.I32;
break;
case '6':
result = TType.I64;
break;
}
break;
case 'l':
result = TType.LIST;
break;
case 'm':
result = TType.MAP;
break;
case 'r':
result = TType.STRUCT;
break;
case 's':
if (name[1] == 't') {
result = TType.STRING;
}
else if (name[1] == 'e') {
result = TType.SET;
}
break;
case 't':
result = TType.BOOL;
break;
}
}
if (result == TType.STOP) {
throw new TProtocolException(TProtocolException.NOT_IMPLEMENTED,
"Unrecognized type");
}
return result;
}
// Base class for tracking JSON contexts that may require inserting/reading
// additional JSON syntax characters
// This base context does nothing.
protected class JSONBaseContext {
protected void write() throws TException {}
protected void read() throws TException {}
protected boolean escapeNum() { return false; }
}
// Context for JSON lists. Will insert/read commas before each item except
// for the first one
protected class JSONListContext extends JSONBaseContext {
private boolean first_ = true;
@Override
protected void write() throws TException {
if (first_) {
first_ = false;
} else {
trans_.write(COMMA);
}
}
@Override
protected void read() throws TException {
if (first_) {
first_ = false;
} else {
readJSONSyntaxChar(COMMA);
}
}
}
// Context for JSON records. Will insert/read colons before the value portion
// of each record pair, and commas before each key except the first. In
// addition, will indicate that numbers in the key position need to be
// escaped in quotes (since JSON keys must be strings).
protected class JSONPairContext extends JSONBaseContext {
private boolean first_ = true;
private boolean colon_ = true;
@Override
protected void write() throws TException {
if (first_) {
first_ = false;
colon_ = true;
} else {
trans_.write(colon_ ? COLON : COMMA);
colon_ = !colon_;
}
}
@Override
protected void read() throws TException {
if (first_) {
first_ = false;
colon_ = true;
} else {
readJSONSyntaxChar(colon_ ? COLON : COMMA);
colon_ = !colon_;
}
}
@Override
protected boolean escapeNum() {
return colon_;
}
}
// Holds up to one byte from the transport
protected class LookaheadReader {
private boolean hasData_;
private byte[] data_ = new byte[1];
// Return and consume the next byte to be read, either taking it from the
// data buffer if present or getting it from the transport otherwise.
protected byte read() throws TException {
if (hasData_) {
hasData_ = false;
}
else {
trans_.readAll(data_, 0, 1);
}
return data_[0];
}
// Return the next byte to be read without consuming, filling the data
// buffer if it has not been filled already.
protected byte peek() throws TException {
if (!hasData_) {
trans_.readAll(data_, 0, 1);
}
hasData_ = true;
return data_[0];
}
}
// Stack of nested contexts that we may be in
private Stack contextStack_ = new Stack();
// Current context that we are in
private JSONBaseContext context_ = new JSONBaseContext();
// Reader that manages a 1-byte buffer
private LookaheadReader reader_ = new LookaheadReader();
// Push a new JSON context onto the stack.
private void pushContext(JSONBaseContext c) {
contextStack_.push(context_);
context_ = c;
}
// Pop the last JSON context off the stack
private void popContext() {
context_ = contextStack_.pop();
}
/**
* Constructor
*/
public TJSONProtocol(TTransport trans) {
super(trans);
}
@Override
public void reset() {
contextStack_.clear();
context_ = new JSONBaseContext();
reader_ = new LookaheadReader();
}
// Temporary buffer used by several methods
private byte[] tmpbuf_ = new byte[4];
// Read a byte that must match b[0]; otherwise an exception is thrown.
// Marked protected to avoid synthetic accessor in JSONListContext.read
// and JSONPairContext.read
protected void readJSONSyntaxChar(byte[] b) throws TException {
byte ch = reader_.read();
if (ch != b[0]) {
throw new TProtocolException(TProtocolException.INVALID_DATA,
"Unexpected character:" + (char)ch);
}
}
// Convert a byte containing a hex char ('0'-'9' or 'a'-'f') into its
// corresponding hex value
private static final byte hexVal(byte ch) throws TException {
if ((ch >= '0') && (ch <= '9')) {
return (byte)((char)ch - '0');
}
else if ((ch >= 'a') && (ch <= 'f')) {
return (byte)((char)ch - 'a' + 10);
}
else {
throw new TProtocolException(TProtocolException.INVALID_DATA,
"Expected hex character");
}
}
// Convert a byte containing a hex value to its corresponding hex character
private static final byte hexChar(byte val) {
val &= 0x0F;
if (val < 10) {
return (byte)((char)val + '0');
}
else {
return (byte)((char)(val - 10) + 'a');
}
}
// Write the bytes in array buf as a JSON characters, escaping as needed
private void writeJSONString(byte[] b) throws TException {
context_.write();
trans_.write(QUOTE);
int len = b.length;
for (int i = 0; i < len; i++) {
if ((b[i] & 0x00FF) >= 0x30) {
if (b[i] == BACKSLASH[0]) {
trans_.write(BACKSLASH);
trans_.write(BACKSLASH);
}
else {
trans_.write(b, i, 1);
}
}
else {
tmpbuf_[0] = JSON_CHAR_TABLE[b[i]];
if (tmpbuf_[0] == 1) {
trans_.write(b, i, 1);
}
else if (tmpbuf_[0] > 1) {
trans_.write(BACKSLASH);
trans_.write(tmpbuf_, 0, 1);
}
else {
trans_.write(ESCSEQ);
tmpbuf_[0] = hexChar((byte)(b[i] >> 4));
tmpbuf_[1] = hexChar(b[i]);
trans_.write(tmpbuf_, 0, 2);
}
}
}
trans_.write(QUOTE);
}
// Write out number as a JSON value. If the context dictates so, it will be
// wrapped in quotes to output as a JSON string.
private void writeJSONInteger(long num) throws TException {
context_.write();
String str = Long.toString(num);
boolean escapeNum = context_.escapeNum();
if (escapeNum) {
trans_.write(QUOTE);
}
try {
byte[] buf = str.getBytes("UTF-8");
trans_.write(buf);
} catch (UnsupportedEncodingException uex) {
throw new TException("JVM DOES NOT SUPPORT UTF-8");
}
if (escapeNum) {
trans_.write(QUOTE);
}
}
// Write out a double as a JSON value. If it is NaN or infinity or if the
// context dictates escaping, write out as JSON string.
private void writeJSONDouble(double num) throws TException {
context_.write();
String str = Double.toString(num);
boolean special = false;
switch (str.charAt(0)) {
case 'N': // NaN
case 'I': // Infinity
special = true;
break;
case '-':
if (str.charAt(1) == 'I') { // -Infinity
special = true;
}
break;
}
boolean escapeNum = special || context_.escapeNum();
if (escapeNum) {
trans_.write(QUOTE);
}
try {
byte[] b = str.getBytes("UTF-8");
trans_.write(b, 0, b.length);
} catch (UnsupportedEncodingException uex) {
throw new TException("JVM DOES NOT SUPPORT UTF-8");
}
if (escapeNum) {
trans_.write(QUOTE);
}
}
// Write out contents of byte array b as a JSON string with base-64 encoded
// data
private void writeJSONBase64(byte[] b, int offset, int length) throws TException {
context_.write();
trans_.write(QUOTE);
int len = length;
int off = offset;
while (len >= 3) {
// Encode 3 bytes at a time
TBase64Utils.encode(b, off, 3, tmpbuf_, 0);
trans_.write(tmpbuf_, 0, 4);
off += 3;
len -= 3;
}
if (len > 0) {
// Encode remainder
TBase64Utils.encode(b, off, len, tmpbuf_, 0);
trans_.write(tmpbuf_, 0, len + 1);
}
trans_.write(QUOTE);
}
private void writeJSONObjectStart() throws TException {
context_.write();
trans_.write(LBRACE);
pushContext(new JSONPairContext());
}
private void writeJSONObjectEnd() throws TException {
popContext();
trans_.write(RBRACE);
}
private void writeJSONArrayStart() throws TException {
context_.write();
trans_.write(LBRACKET);
pushContext(new JSONListContext());
}
private void writeJSONArrayEnd() throws TException {
popContext();
trans_.write(RBRACKET);
}
@Override
public void writeMessageBegin(TMessage message) throws TException {
writeJSONArrayStart();
writeJSONInteger(VERSION);
try {
byte[] b = message.name.getBytes("UTF-8");
writeJSONString(b);
} catch (UnsupportedEncodingException uex) {
throw new TException("JVM DOES NOT SUPPORT UTF-8");
}
writeJSONInteger(message.type);
writeJSONInteger(message.seqid);
}
@Override
public void writeMessageEnd() throws TException {
writeJSONArrayEnd();
}
@Override
public void writeStructBegin(TStruct struct) throws TException {
writeJSONObjectStart();
}
@Override
public void writeStructEnd() throws TException {
writeJSONObjectEnd();
}
@Override
public void writeFieldBegin(TField field) throws TException {
writeJSONInteger(field.id);
writeJSONObjectStart();
writeJSONString(getTypeNameForTypeID(field.type));
}
@Override
public void writeFieldEnd() throws TException {
writeJSONObjectEnd();
}
@Override
public void writeFieldStop() {}
@Override
public void writeMapBegin(TMap map) throws TException {
writeJSONArrayStart();
writeJSONString(getTypeNameForTypeID(map.keyType));
writeJSONString(getTypeNameForTypeID(map.valueType));
writeJSONInteger(map.size);
writeJSONObjectStart();
}
@Override
public void writeMapEnd() throws TException {
writeJSONObjectEnd();
writeJSONArrayEnd();
}
@Override
public void writeListBegin(TList list) throws TException {
writeJSONArrayStart();
writeJSONString(getTypeNameForTypeID(list.elemType));
writeJSONInteger(list.size);
}
@Override
public void writeListEnd() throws TException {
writeJSONArrayEnd();
}
@Override
public void writeSetBegin(TSet set) throws TException {
writeJSONArrayStart();
writeJSONString(getTypeNameForTypeID(set.elemType));
writeJSONInteger(set.size);
}
@Override
public void writeSetEnd() throws TException {
writeJSONArrayEnd();
}
@Override
public void writeBool(boolean b) throws TException {
writeJSONInteger(b ? (long)1 : (long)0);
}
@Override
public void writeByte(byte b) throws TException {
writeJSONInteger((long)b);
}
@Override
public void writeI16(short i16) throws TException {
writeJSONInteger((long)i16);
}
@Override
public void writeI32(int i32) throws TException {
writeJSONInteger((long)i32);
}
@Override
public void writeI64(long i64) throws TException {
writeJSONInteger(i64);
}
@Override
public void writeDouble(double dub) throws TException {
writeJSONDouble(dub);
}
@Override
public void writeString(String str) throws TException {
try {
byte[] b = str.getBytes("UTF-8");
writeJSONString(b);
} catch (UnsupportedEncodingException uex) {
throw new TException("JVM DOES NOT SUPPORT UTF-8");
}
}
@Override
public void writeBinary(ByteBuffer bin) throws TException {
writeJSONBase64(bin.array(), bin.position() + bin.arrayOffset(), bin.limit() - bin.position() - bin.arrayOffset());
}
/**
* Reading methods.
*/
// Read in a JSON string, unescaping as appropriate.. Skip reading from the
// context if skipContext is true.
private TByteArrayOutputStream readJSONString(boolean skipContext)
throws TException {
TByteArrayOutputStream arr = new TByteArrayOutputStream(DEF_STRING_SIZE);
if (!skipContext) {
context_.read();
}
readJSONSyntaxChar(QUOTE);
while (true) {
byte ch = reader_.read();
if (ch == QUOTE[0]) {
break;
}
if (ch == ESCSEQ[0]) {
ch = reader_.read();
if (ch == ESCSEQ[1]) {
readJSONSyntaxChar(ZERO);
readJSONSyntaxChar(ZERO);
trans_.readAll(tmpbuf_, 0, 2);
ch = (byte)((hexVal((byte)tmpbuf_[0]) << 4) + hexVal(tmpbuf_[1]));
}
else {
int off = ESCAPE_CHARS.indexOf(ch);
if (off == -1) {
throw new TProtocolException(TProtocolException.INVALID_DATA,
"Expected control char");
}
ch = ESCAPE_CHAR_VALS[off];
}
}
arr.write(ch);
}
return arr;
}
// Return true if the given byte could be a valid part of a JSON number.
private boolean isJSONNumeric(byte b) {
switch (b) {
case '+':
case '-':
case '.':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case 'E':
case 'e':
return true;
}
return false;
}
// Read in a sequence of characters that are all valid in JSON numbers. Does
// not do a complete regex check to validate that this is actually a number.
private String readJSONNumericChars() throws TException {
StringBuilder strbld = new StringBuilder();
while (true) {
byte ch = reader_.peek();
if (!isJSONNumeric(ch)) {
break;
}
strbld.append((char)reader_.read());
}
return strbld.toString();
}
// Read in a JSON number. If the context dictates, read in enclosing quotes.
private long readJSONInteger() throws TException {
context_.read();
if (context_.escapeNum()) {
readJSONSyntaxChar(QUOTE);
}
String str = readJSONNumericChars();
if (context_.escapeNum()) {
readJSONSyntaxChar(QUOTE);
}
try {
return Long.valueOf(str);
}
catch (NumberFormatException ex) {
throw new TProtocolException(TProtocolException.INVALID_DATA,
"Bad data encounted in numeric data");
}
}
// Read in a JSON double value. Throw if the value is not wrapped in quotes
// when expected or if wrapped in quotes when not expected.
private double readJSONDouble() throws TException {
context_.read();
if (reader_.peek() == QUOTE[0]) {
TByteArrayOutputStream arr = readJSONString(true);
try {
double dub = Double.valueOf(arr.toString("UTF-8"));
if (!context_.escapeNum() && !Double.isNaN(dub) &&
!Double.isInfinite(dub)) {
// Throw exception -- we should not be in a string in this case
throw new TProtocolException(TProtocolException.INVALID_DATA,
"Numeric data unexpectedly quoted");
}
return dub;
}
catch (UnsupportedEncodingException ex) {
throw new TException("JVM DOES NOT SUPPORT UTF-8");
}
}
else {
if (context_.escapeNum()) {
// This will throw - we should have had a quote if escapeNum == true
readJSONSyntaxChar(QUOTE);
}
try {
return Double.valueOf(readJSONNumericChars());
}
catch (NumberFormatException ex) {
throw new TProtocolException(TProtocolException.INVALID_DATA,
"Bad data encounted in numeric data");
}
}
}
// Read in a JSON string containing base-64 encoded data and decode it.
private byte[] readJSONBase64() throws TException {
TByteArrayOutputStream arr = readJSONString(false);
byte[] b = arr.get();
int len = arr.len();
int off = 0;
int size = 0;
while (len >= 4) {
// Decode 4 bytes at a time
TBase64Utils.decode(b, off, 4, b, size); // NB: decoded in place
off += 4;
len -= 4;
size += 3;
}
// Don't decode if we hit the end or got a single leftover byte (invalid
// base64 but legal for skip of regular string type)
if (len > 1) {
// Decode remainder
TBase64Utils.decode(b, off, len, b, size); // NB: decoded in place
size += len - 1;
}
// Sadly we must copy the byte[] (any way around this?)
byte [] result = new byte[size];
System.arraycopy(b, 0, result, 0, size);
return result;
}
private void readJSONObjectStart() throws TException {
context_.read();
readJSONSyntaxChar(LBRACE);
pushContext(new JSONPairContext());
}
private void readJSONObjectEnd() throws TException {
readJSONSyntaxChar(RBRACE);
popContext();
}
private void readJSONArrayStart() throws TException {
context_.read();
readJSONSyntaxChar(LBRACKET);
pushContext(new JSONListContext());
}
private void readJSONArrayEnd() throws TException {
readJSONSyntaxChar(RBRACKET);
popContext();
}
@Override
public TMessage readMessageBegin() throws TException {
readJSONArrayStart();
if (readJSONInteger() != VERSION) {
throw new TProtocolException(TProtocolException.BAD_VERSION,
"Message contained bad version.");
}
String name;
try {
name = readJSONString(false).toString("UTF-8");
}
catch (UnsupportedEncodingException ex) {
throw new TException("JVM DOES NOT SUPPORT UTF-8");
}
byte type = (byte) readJSONInteger();
int seqid = (int) readJSONInteger();
return new TMessage(name, type, seqid);
}
@Override
public void readMessageEnd() throws TException {
readJSONArrayEnd();
}
@Override
public TStruct readStructBegin() throws TException {
readJSONObjectStart();
return ANONYMOUS_STRUCT;
}
@Override
public void readStructEnd() throws TException {
readJSONObjectEnd();
}
@Override
public TField readFieldBegin() throws TException {
byte ch = reader_.peek();
byte type;
short id = 0;
if (ch == RBRACE[0]) {
type = TType.STOP;
}
else {
id = (short) readJSONInteger();
readJSONObjectStart();
type = getTypeIDForTypeName(readJSONString(false).get());
}
return new TField("", type, id);
}
@Override
public void readFieldEnd() throws TException {
readJSONObjectEnd();
}
@Override
public TMap readMapBegin() throws TException {
readJSONArrayStart();
byte keyType = getTypeIDForTypeName(readJSONString(false).get());
byte valueType = getTypeIDForTypeName(readJSONString(false).get());
int size = (int)readJSONInteger();
readJSONObjectStart();
return new TMap(keyType, valueType, size);
}
@Override
public void readMapEnd() throws TException {
readJSONObjectEnd();
readJSONArrayEnd();
}
@Override
public TList readListBegin() throws TException {
readJSONArrayStart();
byte elemType = getTypeIDForTypeName(readJSONString(false).get());
int size = (int)readJSONInteger();
return new TList(elemType, size);
}
@Override
public void readListEnd() throws TException {
readJSONArrayEnd();
}
@Override
public TSet readSetBegin() throws TException {
readJSONArrayStart();
byte elemType = getTypeIDForTypeName(readJSONString(false).get());
int size = (int)readJSONInteger();
return new TSet(elemType, size);
}
@Override
public void readSetEnd() throws TException {
readJSONArrayEnd();
}
@Override
public boolean readBool() throws TException {
return (readJSONInteger() == 0 ? false : true);
}
@Override
public byte readByte() throws TException {
return (byte) readJSONInteger();
}
@Override
public short readI16() throws TException {
return (short) readJSONInteger();
}
@Override
public int readI32() throws TException {
return (int) readJSONInteger();
}
@Override
public long readI64() throws TException {
return (long) readJSONInteger();
}
@Override
public double readDouble() throws TException {
return readJSONDouble();
}
@Override
public String readString() throws TException {
try {
return readJSONString(false).toString("UTF-8");
}
catch (UnsupportedEncodingException ex) {
throw new TException("JVM DOES NOT SUPPORT UTF-8");
}
}
@Override
public ByteBuffer readBinary() throws TException {
return ByteBuffer.wrap(readJSONBase64());
}
}
