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/*
* ============LICENSE_START=======================================================
* ONAP : ccsdk features
* ================================================================================
* Copyright (C) 2020 highstreet technologies GmbH Intellectual Property.
* All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*
*/
package org.onap.ccsdk.features.sdnr.wt.dataprovider.http;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.JSONObject;
import org.onap.ccsdk.features.sdnr.wt.common.database.HtDatabaseClient;
import org.onap.ccsdk.features.sdnr.wt.dataprovider.impl.DataTreeProviderImpl;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.Entity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @author Michael Dürre
*
*/
public class DataTreeHttpServlet extends HttpServlet {
public enum FilterMode {
Strict, //show only filtered items and their parents
Lazy //show root items (and all their children) which have matches inside
}
/**
*
*/
private static final long serialVersionUID = 1L;
private final DataTreeProviderImpl dataTreeProvider;
private static final Logger LOG = LoggerFactory.getLogger(DataTreeHttpServlet.class);
public DataTreeHttpServlet() {
super();
this.dataTreeProvider = new DataTreeProviderImpl();
}
/**
* @param client
*/
public void setDatabaseClient(HtDatabaseClient client) {
this.dataTreeProvider.setDatabaseClient(client);
}
public static String readPayload(HttpServletRequest request) throws IOException {
String body = null;
StringBuilder stringBuilder = new StringBuilder();
BufferedReader bufferedReader = null;
try {
InputStream inputStream = request.getInputStream();
if (inputStream != null) {
bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
char[] charBuffer = new char[128];
int bytesRead = -1;
while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
stringBuilder.append(charBuffer, 0, bytesRead);
}
} else {
stringBuilder.append("");
}
} catch (IOException ex) {
throw ex;
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException ex) {
throw ex;
}
}
}
body = stringBuilder.toString();
return body;
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
final String uri = req.getRequestURI();
LOG.debug("GET request for {}", uri);
final EntityWithTree e = getEntity(uri);
if (e != null) {
LOG.info("GET request for {} to e={} with tree={}", uri, e.entity, e.tree);
switch (e.entity) {
case Inventoryequipment:
DataTreeObject o = this.dataTreeProvider.readInventoryTree(e.tree, null, FilterMode.Lazy);
this.doJsonResponse(resp, o);
break;
default:
this.notAvailble(resp);
break;
}
} else {
LOG.debug("unable to find entity for uri {}", uri);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
final String uri = req.getRequestURI();
String filter = null;
FilterMode mode = FilterMode.Lazy;
try {
final String body = readPayload(req);
JSONObject data = new JSONObject(body);
if (data.has("query")) {
filter = data.getString("query");
}
if (data.has("mode")) {
mode = data.getString("mode").equals("lazy") ? FilterMode.Lazy : FilterMode.Strict;
}
} catch (Exception e) {
LOG.warn("problem reading payload: {}", e);
}
LOG.debug("POST request for {}", uri);
final EntityWithTree e = getEntity(uri);
if (e != null) {
switch (e.entity) {
case Inventoryequipment:
DataTreeObject o = this.dataTreeProvider.readInventoryTree(e.tree, filter, mode);
this.doJsonResponse(resp, o);
break;
default:
this.notAvailble(resp);
break;
}
}
}
/**
* @param resp
*/
private void notAvailble(HttpServletResponse resp) {
try {
resp.sendError(HttpServletResponse.SC_NOT_FOUND);
} catch (IOException e) {
}
}
public static EntityWithTree getEntity(String uri) {
final String regex = "^\\/tree\\/read-(.*)-tree\\/?(.*)$";
final Pattern pattern = Pattern.compile(regex);
final Matcher matcher = pattern.matcher(uri);
Entity e = null;
if (matcher.find() && matcher.groupCount() > 0) {
try {
e = Entity.forName(matcher.group(1)).get();
return new EntityWithTree(e, matcher.groupCount() > 1 ? matcher.group(2) : null);
} catch (Exception e2) {
LOG.warn("unable to parse {} into entity: {}", matcher.group(2), e2);
}
}
return null;
}
private void doJsonResponse(HttpServletResponse resp, DataTreeObject data) {
resp.setHeader("Content-Type", "application/json");
try {
resp.getWriter().write(data.toJSON());
} catch (IOException e) {
LOG.warn("problem sending response: {}", e);
}
}
public static class EntityWithTree {
public final Entity entity;
public final List<String> tree;
@Override
public String toString() {
return "EntityWithTree [entity=" + entity + ", tree=" + tree + "]";
}
public EntityWithTree(Entity e, String tree) {
this.entity = e;
if (tree != null) {
if (tree.startsWith("/")) {
tree = tree.substring(1);
}
if (tree.endsWith("/")) {
tree = tree.substring(0, tree.length() - 1);
}
String[] tmp = tree.split("\\/");
this.tree = new ArrayList<>();
for (int i = 0; i < tmp.length; i++) {
try {
String s = URLDecoder.decode(tmp[i], "utf-8");
if (s != null && s.length() > 0) {
this.tree.add(s);
}
} catch (UnsupportedEncodingException e1) {
LOG.warn("problem urldecode {}: {}", tmp[i], e);
}
}
} else {
this.tree = null;
}
}
}
}
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