/*
* Copyright 2013-2016 the original author or authors.
*
* 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.springframework.cloud.netflix.zuul.filters;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.springframework.boot.actuate.trace.TraceRepository;
import org.springframework.util.MultiValueMap;
import com.netflix.zuul.context.RequestContext;
import lombok.extern.apachecommons.CommonsLog;
/**
* @author Spencer Gibb
*/
@CommonsLog
public class TraceProxyRequestHelper extends ProxyRequestHelper {
private TraceRepository traces;
public void setTraces(TraceRepository traces) {
this.traces = traces;
}
@Override
public Map<String, Object> debug(String verb, String uri,
MultiValueMap<String, String> headers, MultiValueMap<String, String> params,
InputStream requestEntity) throws IOException {
Map<String, Object> info = new LinkedHashMap<>();
if (this.traces != null) {
RequestContext context = RequestContext.getCurrentContext();
info.put("method", verb);
info.put("path", uri);
info.put("query", getQueryString(params));
info.put("remote", true);
info.put("proxy", context.get("proxy"));
Map<String, Object> trace = new LinkedHashMap<>();
Map<String, Object> input = new LinkedHashMap<>();
trace.put("request", input);
info.put("headers", trace);
debugHeaders(headers, input);
RequestContext ctx = RequestContext.getCurrentContext();
if (shouldDebugBody(ctx)) {
// Prevent input stream from being read if it needs to go downstream
if (requestEntity != null) {
debugRequestEntity(info, ctx.getRequest().getInputStream());
}
}
this.traces.add(info);
return info;
}
return info;
}
void debugHeaders(MultiValueMap<String, String> headers, Map<String, Object> map) {
for (Entry<String, List<String>> entry : headers.entrySet()) {
Collection<String> collection = entry.getValue();
Object value = collection;
if (collection.size() < 2) {
value = collection.isEmpty() ? "" : collection.iterator().next();
}
map.put(entry.getKey(), value);
}
}
public void appendDebug(Map<String, Object> info, int status,
MultiValueMap<String, String> headers) {
if (this.traces != null) {
@SuppressWarnings("unchecked")
Map<String, Object> trace = (Map<String, Object>) info.get("headers");
Map<String, Object> output = new LinkedHashMap<String, Object>();
trace.put("response", output);
debugHeaders(headers, output);
output.put("status", "" + status);
}
}
private void debugRequestEntity(Map<String, Object> info, InputStream inputStream)
throws IOException {
if (RequestContext.getCurrentContext().isChunkedRequestBody()) {
info.put("body", "<chunked>");
return;
}
char[] buffer = new char[4096];
int count = new InputStreamReader(inputStream, Charset.forName("UTF-8"))
.read(buffer, 0, buffer.length);
if (count > 0) {
String entity = new String(buffer).substring(0, count);
info.put("body", entity.length() < 4096 ? entity : entity + "<truncated>");
}
}
}