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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.shiro.guice.web;
20  
21  import java.util.Arrays;
22  import java.util.Iterator;
23  import java.util.Map;
24  
25  import javax.servlet.Filter;
26  import javax.servlet.FilterChain;
27  import javax.servlet.ServletRequest;
28  import javax.servlet.ServletResponse;
29  
30  import com.google.inject.Injector;
31  import com.google.inject.Key;
32  
33  import org.apache.shiro.util.PatternMatcher;
34  import org.apache.shiro.web.filter.mgt.FilterChainResolver;
35  import org.apache.shiro.web.util.WebUtils;
36  
37  class SimpleFilterChainResolver implements FilterChainResolver {
38      private final Map<String, Key<? extends Filter>[]> chains;
39      private final Injector injector;
40      private final PatternMatcher patternMatcher;
41  
42      SimpleFilterChainResolver(Map<String, Key<? extends Filter>[]> chains, Injector injector, PatternMatcher patternMatcher) {
43          this.chains = chains;
44          this.injector = injector;
45          this.patternMatcher = patternMatcher;
46      }
47  
48      public FilterChain getChain(ServletRequest request, ServletResponse response, final FilterChain originalChain) {
49          String path = WebUtils.getPathWithinApplication(WebUtils.toHttp(request));
50          for (final String pathPattern : chains.keySet()) {
51              if (patternMatcher.matches(pathPattern, path)) {
52                  final Iterator<Key<? extends Filter>> chain = Arrays.asList(chains.get(pathPattern)).iterator();
53                  return new SimpleFilterChain(originalChain, new Iterator<Filter>() {
54                      public boolean hasNext() {
55                          return chain.hasNext();
56                      }
57  
58                      public Filter next() {
59                          return injector.getInstance(chain.next());
60                      }
61  
62                      public void remove() {
63                          throw new UnsupportedOperationException();
64                      }
65                  });
66              }
67          }
68          return null;
69      }
70  
71  }