Line data    Source code

       1             : // Copyright (C) 2009 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.httpd;
      16             : 
      17             : import com.google.gerrit.server.util.RequestContext;
      18             : import com.google.gerrit.server.util.ThreadLocalRequestContext;
      19             : import com.google.inject.Inject;
      20             : import com.google.inject.Module;
      21             : import com.google.inject.Provider;
      22             : import com.google.inject.Singleton;
      23             : import com.google.inject.servlet.ServletModule;
      24             : import java.io.IOException;
      25             : import javax.servlet.Filter;
      26             : import javax.servlet.FilterChain;
      27             : import javax.servlet.FilterConfig;
      28             : import javax.servlet.ServletException;
      29             : import javax.servlet.ServletRequest;
      30             : import javax.servlet.ServletResponse;
      31             : 
      32             : /** Set the request context for the downstream filters and invocation. */
      33             : @Singleton
      34             : public class RequestContextFilter implements Filter {
      35             :   public static Module module() {
      36          99 :     return new ServletModule() {
      37             :       @Override
      38             :       protected void configureServlets() {
      39          99 :         filter("/*").through(RequestContextFilter.class);
      40          99 :       }
      41             :     };
      42             :   }
      43             : 
      44             :   private final Provider<HttpRequestContext> requestContext;
      45             :   private final ThreadLocalRequestContext local;
      46             : 
      47             :   @Inject
      48          99 :   RequestContextFilter(Provider<HttpRequestContext> c, ThreadLocalRequestContext l) {
      49          99 :     requestContext = c;
      50          99 :     local = l;
      51          99 :   }
      52             : 
      53             :   @Override
      54          99 :   public void init(FilterConfig filterConfig) {}
      55             : 
      56             :   @Override
      57          99 :   public void destroy() {}
      58             : 
      59             :   @Override
      60             :   public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
      61             :       throws IOException, ServletException {
      62          38 :     RequestContext old = local.setContext(requestContext.get());
      63             :     try {
      64          38 :       chain.doFilter(request, response);
      65             :     } finally {
      66          38 :       local.setContext(old);
      67             :     }
      68          38 :   }
      69             : }