package org.hsweb.web.core.message;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.PropertyPreFilter;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.serializer.SimplePropertyPreFilter;
import org.hsweb.web.core.utils.ThreadLocalUtils;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.AbstractHttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.hsweb.commons.StringUtils;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class FastJsonHttpMessageConverter extends AbstractHttpMessageConverter<Object> {
public final static Charset UTF8 = Charset.forName("UTF-8");
private Charset charset = UTF8;
private SerializerFeature[] features = new SerializerFeature[0];
public FastJsonHttpMessageConverter() {
super(new MediaType("application", "json", UTF8),
new MediaType("application", "*+json", UTF8));
}
@Override
protected boolean supports(Class<?> clazz) {
return true;
}
public Charset getCharset() {
return this.charset;
}
public void setCharset(Charset charset) {
this.charset = charset;
}
public SerializerFeature[] getFeatures() {
return features;
}
public void setFeatures(SerializerFeature... features) {
this.features = features;
}
@Override
protected Object readInternal(Class<?> clazz, HttpInputMessage inputMessage) throws IOException,
HttpMessageNotReadableException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
InputStream in = inputMessage.getBody();
byte[] buf = new byte[1024];
for (; ; ) {
int len = in.read(buf);
if (len == -1) {
break;
}
if (len > 0) {
baos.write(buf, 0, len);
}
}
byte[] bytes = baos.toByteArray();
if (clazz == String.class) return new String(bytes, charset);
return JSON.parseObject(bytes, 0, bytes.length, charset.newDecoder(), clazz);
}
public String converter(Object obj) {
if (obj instanceof String) return (String) obj;
String text;
String callback = ThreadLocalUtils.get("jsonp-callback");
ThreadLocalUtils.remove("jsonp-callback");
if (obj instanceof ResponseMessage) {
ResponseMessage message = (ResponseMessage) obj;
if (message.isSuccess() && message.isOnlyData())
obj = message.getData();
if (obj instanceof String)
text = ((String) obj);
else
text = JSON.toJSONString(obj, parseFilter(message), features);
if (callback == null) callback = message.getCallback();
} else {
text = JSON.toJSONString(obj, features);
}
if (!StringUtils.isNullOrEmpty(callback)) {
text = new StringBuilder()
.append(callback)
.append("(").append(text).append(")")
.toString();
}
return text;
}
@Override
protected void writeInternal(Object obj, HttpOutputMessage outputMessage) throws IOException,
HttpMessageNotWritableException {
OutputStream out = outputMessage.getBody();
byte[] bytes = converter(obj).getBytes(charset);
out.write(bytes);
out.flush();
}
protected PropertyPreFilter[] parseFilter(ResponseMessage responseMessage) {
List<PropertyPreFilter> filters = new ArrayList<>();
if (responseMessage.getIncludes() != null)
for (Map.Entry<Class<?>, Set<String>> classSetEntry : responseMessage.getIncludes().entrySet()) {
SimplePropertyPreFilter filter = new SimplePropertyPreFilter(classSetEntry.getKey());
filter.getIncludes().addAll(classSetEntry.getValue());
filters.add(filter);
}
if (responseMessage.getExcludes() != null)
for (Map.Entry<Class<?>, Set<String>> classSetEntry : responseMessage.getExcludes().entrySet()) {
SimplePropertyPreFilter filter = new SimplePropertyPreFilter(classSetEntry.getKey());
filter.getExcludes().addAll(classSetEntry.getValue());
filters.add(filter);
}
return filters.toArray(new PropertyPreFilter[filters.size()]);
}
}