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/*
* Copyright © 2016-2017 European Support Limited
*
* 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.openecomp.sdc.itempermissions.servlet;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.HttpMethod;
import javax.ws.rs.core.Response;
import org.openecomp.sdc.common.errors.ErrorCode;
import org.openecomp.sdc.common.errors.ErrorCodeAndMessage;
import org.openecomp.sdc.common.errors.Messages;
import org.openecomp.sdc.itempermissions.PermissionsServices;
import org.openecomp.sdc.itempermissions.PermissionsServicesFactory;
import org.openecomp.sdc.logging.api.Logger;
import org.openecomp.sdc.logging.api.LoggerFactory;
/**
* Created by ayalaben on 6/27/2017.
*/
public class PermissionsFilter implements Filter {
private static final Logger LOGGER = LoggerFactory.getLogger(PermissionsFilter.class);
private static final String IRRELEVANT_REQUEST = "Irrelevant_Request";
private static final String EDIT_ITEM = "Edit_Item";
private final PermissionsServices permissionsServices;
public PermissionsFilter() {
this(PermissionsServicesFactory.getInstance().createInterface());
}
PermissionsFilter(PermissionsServices permissionsServices) {
this.permissionsServices = permissionsServices;
}
@Override
public void init(FilterConfig filterConfig) {
// required by servlet API
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException {
if ((servletRequest instanceof HttpServletRequest) && isRelevant((HttpServletRequest) servletRequest, servletResponse)) {
filterChain.doFilter(servletRequest, servletResponse);
}
}
private boolean isRelevant(HttpServletRequest servletRequest, ServletResponse servletResponse) throws IOException {
String method = servletRequest.getMethod();
if (method.equals(HttpMethod.POST) || method.equals(HttpMethod.PUT) || method.equals(HttpMethod.DELETE)) {
String userId = servletRequest.getHeader("USER_ID");
String itemId = parseItemIdFromPath(servletRequest.getPathInfo());
if (!itemId.equals(IRRELEVANT_REQUEST) && !permissionsServices.isAllowed(itemId, userId, EDIT_ITEM)) {
((HttpServletResponse) servletResponse).setStatus(HttpServletResponse.SC_FORBIDDEN);
servletResponse.getWriter()
.print(buildResponse(Response.Status.FORBIDDEN, Messages.PERMISSIONS_ERROR.getErrorMessage(), Messages.PERMISSIONS_ERROR.name()));
return false;
}
}
return true;
}
private String parseItemIdFromPath(String pathInfo) {
String[] tokens = pathInfo.split("/");
if (tokens.length < 4) {
return IRRELEVANT_REQUEST;
} else {
return tokens[3];
}
}
@Override
public void destroy() {
// required by serlvet API
}
private String buildResponse(Response.Status status, String message, String id) {
ErrorCode errorCode = new ErrorCode.ErrorCodeBuilder().withId(id).withMessage(message).build();
return objectToJsonString(new ErrorCodeAndMessage(status, errorCode));
}
private String objectToJsonString(Object obj) {
try {
return new ObjectMapper().writerWithDefaultPrettyPrinter().writeValueAsString(obj);
} catch (Exception e) {
LOGGER.error(e.getMessage(), e);
return "An internal error has occurred. Please contact support.";
}
}
}
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