gerrit.onap Code Review - sdc.git/blob

   1 /*
   2  * Copyright © 2016-2017 European Support Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.openecomp.sdc.itempermissions.servlet;
  18
  19 import java.io.IOException;
  20 import javax.servlet.Filter;
  21 import javax.servlet.FilterChain;
  22 import javax.servlet.FilterConfig;
  23 import javax.servlet.ServletException;
  24 import javax.servlet.ServletRequest;
  25 import javax.servlet.ServletResponse;
  26 import javax.servlet.http.HttpServletRequest;
  27 import javax.servlet.http.HttpServletResponse;
  28 import javax.ws.rs.HttpMethod;
  29 import javax.ws.rs.core.Response;
  30
  31 import org.codehaus.jackson.map.ObjectMapper;
  32 import org.openecomp.sdc.common.errors.ErrorCode;
  33 import org.openecomp.sdc.common.errors.ErrorCodeAndMessage;
  34 import org.openecomp.sdc.common.errors.Messages;
  35 import org.openecomp.sdc.itempermissions.PermissionsServices;
  36 import org.openecomp.sdc.itempermissions.PermissionsServicesFactory;
  37 import org.openecomp.sdc.logging.api.Logger;
  38 import org.openecomp.sdc.logging.api.LoggerFactory;
  39
  40 /**
  41  * Created by ayalaben on 6/27/2017.
  42  */
  43 public class PermissionsFilter implements Filter {
  44
  45     private static final Logger LOGGER = LoggerFactory.getLogger(PermissionsFilter.class);
  46     private final PermissionsServices permissionsServices;
  47     private static final String IRRELEVANT_REQUEST = "Irrelevant_Request";
  48     private static final String EDIT_ITEM = "Edit_Item";
  49
  50     public PermissionsFilter() {
  51         this.permissionsServices = PermissionsServicesFactory.getInstance().createInterface();
  52     }
  53
  54     @Override
  55     public void init(FilterConfig filterConfig) {
  56         // required by servlet API
  57     }
  58
  59     @Override
  60     public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
  61             throws IOException, ServletException {
  62
  63         if ((servletRequest instanceof HttpServletRequest)
  64                     && isRelevant((HttpServletRequest) servletRequest, servletResponse)) {
  65             filterChain.doFilter(servletRequest, servletResponse);
  66         }
  67     }
  68
  69     private boolean isRelevant(HttpServletRequest servletRequest, ServletResponse servletResponse) throws IOException {
  70         String method = servletRequest.getMethod();
  71         if (method.equals(HttpMethod.POST) || method.equals(HttpMethod.PUT) || method.equals(HttpMethod.DELETE)) {
  72
  73             String userId = servletRequest.getHeader("USER_ID");
  74             String itemId = parseItemIdFromPath(servletRequest.getPathInfo());
  75
  76             if (!itemId.equals(IRRELEVANT_REQUEST) && !permissionsServices.isAllowed(itemId, userId, EDIT_ITEM)) {
  77                 ((HttpServletResponse) servletResponse).setStatus(HttpServletResponse.SC_FORBIDDEN);
  78                 servletResponse.getWriter().print(buildResponse(Response.Status.FORBIDDEN,
  79                         Messages.PERMISSIONS_ERROR.getErrorMessage(),
  80                         Messages.PERMISSIONS_ERROR.name()));
  81                 return false;
  82             }
  83         }
  84
  85         return true;
  86     }
  87
  88     private String parseItemIdFromPath(String pathInfo) {
  89         String[] tokens = pathInfo.split("/");
  90         if (tokens.length < 4) {
  91             return IRRELEVANT_REQUEST;
  92         } else {
  93             return tokens[3];
  94         }
  95     }
  96
  97     @Override
  98     public void destroy() {
  99         // required by serlvet API
 100     }
 101
 102     private String buildResponse(Response.Status status, String message, String id) {
 103         ErrorCode errorCode = new ErrorCode.ErrorCodeBuilder()
 104                                       .withId(id)
 105                                       .withMessage(message).build();
 106         return objectToJsonString(new ErrorCodeAndMessage(status, errorCode));
 107     }
 108
 109     private String objectToJsonString(Object obj) {
 110         try {
 111             return new ObjectMapper().writerWithDefaultPrettyPrinter().writeValueAsString(obj);
 112         } catch (Exception e) {
 113             LOGGER.error(e.getMessage(), e);
 114             return "An internal error has occurred. Please contact support.";
 115         }
 116     }
 117 }