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/*
* ============LICENSE_START========================================================================
* ONAP : ccsdk feature sdnr wt
* =================================================================================================
* Copyright (C) 2019 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.helpserver;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URISyntaxException;
import java.net.URLDecoder;
import java.nio.file.Path;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.onap.ccsdk.features.sdnr.wt.helpserver.data.HelpInfrastructureObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class HelpServlet extends HttpServlet implements AutoCloseable {
private static Logger LOG = LoggerFactory.getLogger(HelpServlet.class);
private static final long serialVersionUID = -4285072760648493461L;
private static final String BASEURI = "/help";
private final Path basePath;
public HelpServlet() {
LOG.info("Starting HelpServlet instance {}", this.hashCode());
HelpInfrastructureObject.createFilesFromResources();
this.basePath = HelpInfrastructureObject.getHelpDirectoryBase();
}
@Override
public void doOptions(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.addHeader("Access-Control-Allow-Origin", "*");
resp.addHeader("Access-Control-Allow-Methods", "OPTIONS, HEAD, GET, POST, PUT, DELETE");
resp.addHeader("Access-Control-Allow-Headers", "X-Requested-With, Content-Type, Content-Length");
}
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String query = req.getQueryString();
resp.addHeader("Access-Control-Allow-Origin", "*");
resp.addHeader("Access-Control-Allow-Methods", "OPTIONS, HEAD, GET, POST, PUT, DELETE");
resp.addHeader("Access-Control-Allow-Headers", "X-Requested-With, Content-Type, Content-Length");
if (query != null && query.contains("meta")) {
File f = new File(HelpInfrastructureObject.KARAFHELPDIRECTORY, "meta.json");
if (f.exists()) {
LOG.debug("found local meta file");
try (BufferedReader rd = new BufferedReader(new FileReader(f));) {
String line = rd.readLine();
while (line != null) {
resp.getOutputStream().println(line);
line = rd.readLine();
}
rd.close();
} catch (IOException e) {
LOG.debug("Can not read meta file", e);
}
} else {
LOG.debug("start walking from path=" + basePath.toAbsolutePath().toString());
HelpInfrastructureObject o = null;
try {
o = new HelpInfrastructureObject(this.basePath);
} catch (URISyntaxException e) {
LOG.debug("Can not relsolve URI. ", e);
}
resp.getOutputStream().println(o != null ? o.toString() : "");
}
resp.setHeader("Content-Type", "application/json");
} else {
LOG.debug("received get with uri=" + req.getRequestURI());
String uri = URLDecoder.decode(req.getRequestURI().substring(BASEURI.length()), "UTF-8");
if (uri.startsWith("/")) {
uri = uri.substring(1);
}
Path p = basePath.resolve(uri);
File f = p.toFile();
if (f.isFile() && f.exists()) {
LOG.debug("found file for request");
if (this.isTextFile(f)) {
resp.setHeader("Content-Type", "application/text");
resp.setHeader("charset", "utf-8");
} else if (this.isImageFile(f)) {
resp.setHeader("Content-Type", "image/*");
} else if (this.ispdf(f)) {
resp.setHeader("Content-Type", "application/pdf");
} else {
LOG.debug("file is not allowed to deliver");
resp.setStatus(404);
return;
}
LOG.debug("delivering file");
try (OutputStream out = resp.getOutputStream()) {
try (FileInputStream in = new FileInputStream(f)) {
byte[] buffer = new byte[1024];
int len;
while ((len = in.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
in.close();
out.flush();
out.close();
}
} catch (IOException e) {
LOG.warn("Can not write meta file", e);
resp.setStatus(500);
}
} else {
LOG.debug("found not file for request");
resp.setStatus(404);
}
}
}
private boolean ispdf(File f) {
return f != null && this.ispdf(f.getName());
}
private boolean ispdf(String name) {
return name != null && name.toLowerCase().endsWith("pdf");
}
private boolean isImageFile(File f) {
return f != null && this.isImageFile(f.getName());
}
private boolean isImageFile(String name) {
return name != null
? name.toLowerCase().endsWith("png") || name.toLowerCase().endsWith("jpg")
|| name.toLowerCase().endsWith("jpeg") || name.toLowerCase().endsWith("svg")
|| name.toLowerCase().endsWith("eps")
: false;
}
private boolean isTextFile(File f) {
return f != null && this.isTextFile(f.getName());
}
private boolean isTextFile(String name) {
return name != null
? name.toLowerCase().endsWith("md") || name.toLowerCase().endsWith("txt")
|| name.toLowerCase().endsWith("html") || name.toLowerCase().endsWith("htm")
|| name.toLowerCase().endsWith("js") || name.toLowerCase().endsWith("css")
: false;
}
@Override
public void close() throws Exception {}
}
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