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 com.fasterxml.jackson.databind.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(PermissionsServicesFactory.getInstance().createInterface());
  52     }
  53
  54     PermissionsFilter(PermissionsServices permissionsServices) {
  55         this.permissionsServices = permissionsServices;
  56     }
  57
  58     @Override
  59     public void init(FilterConfig filterConfig) {
  60         // required by servlet API
  61     }
  62
  63     @Override
  64     public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
  65             throws IOException, ServletException {
  66
  67         if ((servletRequest instanceof HttpServletRequest)
  68                     && isRelevant((HttpServletRequest) servletRequest, servletResponse)) {
  69             filterChain.doFilter(servletRequest, servletResponse);
  70         }
  71     }
  72
  73     private boolean isRelevant(HttpServletRequest servletRequest, ServletResponse servletResponse) throws IOException {
  74         String method = servletRequest.getMethod();
  75         if (method.equals(HttpMethod.POST) || method.equals(HttpMethod.PUT) || method.equals(HttpMethod.DELETE)) {
  76
  77             String userId = servletRequest.getHeader("USER_ID");
  78             String itemId = parseItemIdFromPath(servletRequest.getPathInfo());
  79
  80             if (!itemId.equals(IRRELEVANT_REQUEST) && !permissionsServices.isAllowed(itemId, userId, EDIT_ITEM)) {
  81                 ((HttpServletResponse) servletResponse).setStatus(HttpServletResponse.SC_FORBIDDEN);
  82                 servletResponse.getWriter().print(buildResponse(Response.Status.FORBIDDEN,
  83                         Messages.PERMISSIONS_ERROR.getErrorMessage(),
  84                         Messages.PERMISSIONS_ERROR.name()));
  85                 return false;
  86             }
  87         }
  88
  89         return true;
  90     }
  91
  92     private String parseItemIdFromPath(String pathInfo) {
  93         String[] tokens = pathInfo.split("/");
  94         if (tokens.length < 4) {
  95             return IRRELEVANT_REQUEST;
  96         } else {
  97             return tokens[3];
  98         }
  99     }
 100
 101     @Override
 102     public void destroy() {
 103         // required by serlvet API
 104     }
 105
 106     private String buildResponse(Response.Status status, String message, String id) {
 107         ErrorCode errorCode = new ErrorCode.ErrorCodeBuilder()
 108                                       .withId(id)
 109                                       .withMessage(message).build();
 110         return objectToJsonString(new ErrorCodeAndMessage(status, errorCode));
 111     }
 112
 113     private String objectToJsonString(Object obj) {
 114         try {
 115             return new ObjectMapper().writerWithDefaultPrettyPrinter().writeValueAsString(obj);
 116         } catch (Exception e) {
 117             LOGGER.error(e.getMessage(), e);
 118             return "An internal error has occurred. Please contact support.";
 119         }
 120     }
 121 }