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/*
* Copyright 2015 Open Networking Laboratory
*
* 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 org.onosproject.ovsdb.rfc.utils;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufInputStream;
import java.io.IOException;
import java.util.List;
import java.util.Stack;
import org.onosproject.ovsdb.rfc.exception.UnsupportedException;
import org.onosproject.ovsdb.rfc.jsonrpc.JsonReadContext;
import com.fasterxml.jackson.core.JsonEncoding;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.io.IOContext;
import com.fasterxml.jackson.core.json.ByteSourceJsonBootstrapper;
import com.fasterxml.jackson.core.util.BufferRecycler;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.MappingJsonFactory;
/**
* Decoder utility class.
*/
public final class JsonRpcReaderUtil {
/**
* Constructs a JsonRpcReaderUtil object. Utility classes should not have a
* public or default constructor, otherwise IDE will compile unsuccessfully.
* This class should not be instantiated.
*/
private JsonRpcReaderUtil() {
}
/**
* Decode the bytes to Json object.
* @param in input of bytes
* @param out ouput of Json object list
* @param jrContext context for the last decoding process
* @throws IOException IOException
* @throws JsonParseException JsonParseException
*/
public static void readToJsonNode(ByteBuf in, List<Object> out, JsonReadContext jrContext)
throws JsonParseException, IOException {
int lastReadBytes = jrContext.getLastReadBytes();
if (lastReadBytes == 0) {
if (in.readableBytes() < 4) {
return;
}
checkEncoding(in);
}
int i = lastReadBytes + in.readerIndex();
Stack<Byte> bufStack = jrContext.getBufStack();
for (; i < in.writerIndex(); i++) {
byte b = in.getByte(i);
switch (b) {
case '{':
if (!isDoubleQuote(bufStack)) {
bufStack.push(b);
jrContext.setStartMatch(true);
}
break;
case '}':
if (!isDoubleQuote(bufStack)) {
bufStack.pop();
}
break;
case '"':
if (in.getByte(i - 1) != '\\') {
if (!bufStack.isEmpty() && bufStack.peek() != '"') {
bufStack.push(b);
} else {
bufStack.pop();
}
}
break;
default:
break;
}
if (jrContext.isStartMatch() && bufStack.isEmpty()) {
ByteBuf buf = in.readSlice(i - in.readerIndex() + 1);
JsonParser jf = new MappingJsonFactory().createParser(new ByteBufInputStream(buf));
JsonNode jsonNode = jf.readValueAsTree();
out.add(jsonNode);
lastReadBytes = 0;
jrContext.setLastReadBytes(lastReadBytes);
break;
}
}
if (i >= in.writerIndex()) {
lastReadBytes = in.readableBytes();
jrContext.setLastReadBytes(lastReadBytes);
}
}
/**
* Filter the invalid characters before decoding.
* @param in input of bytes
* @param lastReadBytes the bytes for last decoding incomplete record
*/
private static void fliterCharaters(ByteBuf in) {
while (in.isReadable()) {
int ch = in.getByte(in.readerIndex());
if ((ch != ' ') && (ch != '\n') && (ch != '\t') && (ch != '\r')) {
break;
} else {
in.readByte();
}
}
}
/**
* Check whether the peek of the stack element is double quote.
* @param jrContext context for the last decoding process
* @return boolean
*/
private static boolean isDoubleQuote(Stack<Byte> bufStack) {
if (!bufStack.isEmpty() && bufStack.peek() == '"') {
return true;
}
return false;
}
/**
* Check whether the encoding is valid.
* @param in input of bytes
* @throws IOException this is an IO exception
* @throws UnsupportedException this is an unsupported exception
*/
private static void checkEncoding(ByteBuf in) throws IOException {
int inputStart = 0;
int inputLength = 4;
fliterCharaters(in);
byte[] buff = new byte[4];
in.getBytes(in.readerIndex(), buff);
ByteSourceJsonBootstrapper strapper = new ByteSourceJsonBootstrapper(new IOContext(new BufferRecycler(),
null,
false),
buff, inputStart,
inputLength);
JsonEncoding jsonEncoding = strapper.detectEncoding();
if (!JsonEncoding.UTF8.equals(jsonEncoding)) {
throw new UnsupportedException("Only UTF-8 encoding is supported.");
}
}
}
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