package com.epam.wilma.webapp.config.servlet.stub.resource;
/*==========================================================================
Copyright 2013-2017 EPAM Systems
This file is part of Wilma.
Wilma is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Wilma is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Wilma. If not, see <http://www.gnu.org/licenses/>.
===========================================================================*/
import java.io.IOException;
import java.io.PrintWriter;
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.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.epam.wilma.domain.stubconfig.StubResourcePathProvider;
import com.epam.wilma.webapp.config.servlet.helper.FileListJsonBuilder;
import com.epam.wilma.webapp.config.servlet.stub.helper.ResourceFileNameHandler;
/**
* This servlet reads all the names of the stub resources and returns them in json.
* @author Tunde_Kovacs
*
*/
@Component
public class StubResourceHandlerServlet extends HttpServlet {
private static final String TEMPLATE = "template";
private static final String INTERCEPTOR = "interceptor";
private static final String CONDITION_CHECKER = "condition-checker";
private static final String TEMPLATE_FORMATTER = "template-formatter";
private static final String SEQUENCE_HANDLER = "sequence-handler";
private static final String NO_TYPE_ERR_MSG = "Please provide a type parameter in the url!";
private static final String APPLICATION_JSON = "application/json";
private static final String JAR = "jar";
private static final String HTML = "text/html";
private static final String ERROR_MESSAGE_TEMPLATE = "Invalid type %s ! Valid types are: %s, %s, %s, %s, %s and %s!";
@Autowired
private FileListJsonBuilder fileJsonBuilder;
@Autowired
private StubResourcePathProvider stubResourcePathProvider;
@Autowired
private ResourceFileNameHandler resourceFileNameHandler;
@Override
protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
String type = req.getParameter("type");
if (type != null) {
Path path = getResourcePath(type);
if (path != null) {
writeResponse(req, resp, path);
} else {
writeError(resp, String.format(ERROR_MESSAGE_TEMPLATE, type, INTERCEPTOR, CONDITION_CHECKER, TEMPLATE_FORMATTER, TEMPLATE, JAR,
SEQUENCE_HANDLER));
}
} else {
writeError(resp, NO_TYPE_ERR_MSG);
}
}
private void writeResponse(final HttpServletRequest req, final HttpServletResponse resp, final Path path) throws IOException {
if (pathIsEmpty(req)) {
writeFileNamesToResponse(resp, path);
} else {
resourceFileNameHandler.writeResourceFile(resp, req.getPathInfo(), path);
}
}
@Override
protected void doPost(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
private Path getResourcePath(final String type) {
Path path = null;
if (CONDITION_CHECKER.equals(type)) {
path = stubResourcePathProvider.getConditionCheckerPath();
} else if (TEMPLATE_FORMATTER.equals(type)) {
path = stubResourcePathProvider.getTemplateFormatterPath();
} else if (TEMPLATE.equals(type)) {
path = stubResourcePathProvider.getTemplatesPath();
} else if (INTERCEPTOR.equals(type)) {
path = stubResourcePathProvider.getInterceptorPath();
} else if (JAR.equals(type)) {
path = stubResourcePathProvider.getJarPath();
} else if (SEQUENCE_HANDLER.equals(type)) {
path = stubResourcePathProvider.getSequenceHandlerPath();
}
return path;
}
private boolean pathIsEmpty(final HttpServletRequest req) {
return req.getPathInfo() == null;
}
private void writeFileNamesToResponse(final HttpServletResponse resp, final Path path) throws IOException {
PrintWriter out = resp.getWriter();
resp.setContentType(APPLICATION_JSON);
out.write(fileJsonBuilder.buildFileListJson(path.toFile()));
out.flush();
out.close();
}
private void writeError(final HttpServletResponse resp, final String message) throws IOException {
resp.setContentType(HTML);
PrintWriter out = resp.getWriter();
out.write(message);
out.flush();
out.close();
}
}