opendaylight/commons/filter-valve/src/main/java/org/opendaylight/controller/filtervalve/cors/model/FilterProcessor.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.controller.filtervalve.cors.model;
  10
  11 import com.google.common.base.Optional;
  12 import java.io.IOException;
  13 import java.util.List;
  14 import java.util.ListIterator;
  15 import javax.servlet.FilterChain;
  16 import javax.servlet.ServletException;
  17 import javax.servlet.ServletRequest;
  18 import javax.servlet.ServletResponse;
  19 import org.apache.catalina.connector.Request;
  20 import org.apache.catalina.connector.Response;
  21 import org.opendaylight.controller.filtervalve.cors.jaxb.Context;
  22 import org.opendaylight.controller.filtervalve.cors.jaxb.Filter;
  23 import org.opendaylight.controller.filtervalve.cors.jaxb.Host;
  24 import org.slf4j.Logger;
  25 import org.slf4j.LoggerFactory;
  26
  27 public class FilterProcessor {
  28     private static final Logger logger = LoggerFactory.getLogger(FilterProcessor.class);
  29
  30     private final Host host;
  31
  32     public FilterProcessor(Host host) {
  33         this.host = host;
  34     }
  35
  36     public void process(Request request, Response response, FilterChain nextValveFilterChain)
  37             throws IOException, ServletException {
  38
  39         String contextPath = request.getContext().getPath();
  40         String path = request.getDecodedRequestURI();
  41
  42         Optional<Context> maybeContext = host.findContext(contextPath);
  43         logger.trace("Processing context {} path {}, found {}", contextPath, path, maybeContext);
  44         if (maybeContext.isPresent()) {
  45             // process filters
  46             Context context = maybeContext.get();
  47             List<Filter> matchingFilters = context.findMatchingFilters(path);
  48             FilterChain fromLast = nextValveFilterChain;
  49             ListIterator<Filter> it = matchingFilters.listIterator(matchingFilters.size());
  50             final boolean trace = logger.isTraceEnabled();
  51             while (it.hasPrevious()) {
  52                 final Filter currentFilter = it.previous();
  53                 final FilterChain copy = fromLast;
  54                 fromLast = new FilterChain() {
  55                     @Override
  56                     public void doFilter(ServletRequest request, ServletResponse response) throws IOException, ServletException {
  57                         if (trace) {
  58                             logger.trace("Applying {}", currentFilter);
  59                         }
  60                         javax.servlet.Filter actualFilter = currentFilter.getActualFilter();
  61                         actualFilter.doFilter(request, response, copy);
  62                     }
  63                 };
  64             }
  65             // call first filter
  66             fromLast.doFilter(request, response);
  67         } else {
  68             // move to next valve
  69             nextValveFilterChain.doFilter(request, response);
  70         }
  71     }
  72 }