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 org.apache.catalina.connector.Request;
  18 import org.apache.catalina.connector.Response;
  19 import org.opendaylight.controller.filtervalve.cors.jaxb.Context;
  20 import org.opendaylight.controller.filtervalve.cors.jaxb.Filter;
  21 import org.opendaylight.controller.filtervalve.cors.jaxb.Host;
  22 import org.slf4j.Logger;
  23 import org.slf4j.LoggerFactory;
  24
  25 public class FilterProcessor {
  26     private static final Logger logger = LoggerFactory.getLogger(FilterProcessor.class);
  27
  28     private final Host host;
  29
  30     public FilterProcessor(Host host) {
  31         this.host = host;
  32     }
  33
  34     public void process(Request request, Response response, FilterChain nextValveFilterChain)
  35             throws IOException, ServletException {
  36
  37         String contextPath = request.getContext().getPath();
  38         String path = request.getDecodedRequestURI();
  39
  40         Optional<Context> maybeContext = host.findContext(contextPath);
  41         logger.trace("Processing context {} path {}, found {}", contextPath, path, maybeContext);
  42         if (maybeContext.isPresent()) {
  43             // process filters
  44             Context context = maybeContext.get();
  45             List<Filter> matchingFilters = context.findMatchingFilters(path);
  46             FilterChain fromLast = nextValveFilterChain;
  47             ListIterator<Filter> it = matchingFilters.listIterator(matchingFilters.size());
  48             final boolean trace = logger.isTraceEnabled();
  49             while (it.hasPrevious()) {
  50                 final Filter currentFilter = it.previous();
  51                 final FilterChain copy = fromLast;
  52                 fromLast = (request1, response1) -> {
  53                     if (trace) {
  54                         logger.trace("Applying {}", currentFilter);
  55                     }
  56                     javax.servlet.Filter actualFilter = currentFilter.getActualFilter();
  57                     actualFilter.doFilter(request1, response1, copy);
  58                 };
  59             }
  60             // call first filter
  61             fromLast.doFilter(request, response);
  62         } else {
  63             // move to next valve
  64             nextValveFilterChain.doFilter(request, response);
  65         }
  66     }
  67 }