github-oauth/src/main/java/com/googlesource/gerrit/plugins/github/oauth/OAuthFilter.java

// Copyright (C) 2013 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.googlesource.gerrit.plugins.github.oauth;

import java.io.IOException;
import java.util.regex.Pattern;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import org.slf4j.LoggerFactory;

import com.google.gerrit.httpd.GitOverHttpServlet;
import com.google.gerrit.server.cache.h2.DefaultCacheFactory;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Singleton;

@Singleton
public class OAuthFilter implements Filter {
  private static final org.slf4j.Logger log = LoggerFactory
      .getLogger(OAuthFilter.class);
  private static Pattern GIT_HTTP_REQUEST_PATTERN = Pattern
      .compile(GitOverHttpServlet.URL_REGEX);

  private final GitHubOAuthConfig config;
  private final OAuthGitFilter gitFilter;
  private final OAuthWebFilter webFilter;

  @Inject
  public OAuthFilter(GitHubOAuthConfig config, 
      OAuthWebFilter webFilter, Injector injector) {
    this.config = config;
    this.webFilter = webFilter;
    Injector childInjector = injector.createChildInjector(OAuthCache.module());
    this.gitFilter = childInjector.getInstance(OAuthGitFilter.class);
  }

  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
    gitFilter.init(filterConfig);
    webFilter.init(filterConfig);
  }

  @Override
  public void doFilter(ServletRequest request, ServletResponse response,
      FilterChain chain) throws IOException, ServletException {

    if (!config.enabled) {
      chain.doFilter(request, response);
      return;
    }

    String requestUrl = ((HttpServletRequest) request).getRequestURI();
    if (GIT_HTTP_REQUEST_PATTERN.matcher(requestUrl).matches()) {
      gitFilter.doFilter(request, response, chain);
    } else {
      webFilter.doFilter(request, response, chain);
    }
  }

  @Override
  public void destroy() {
    log.info("Destroy");
    gitFilter.destroy();
    webFilter.destroy();
  }
}