/*
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* Copyright 2014 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit.servlet;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import com.google.inject.Inject;
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import com.google.inject.Singleton;
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import javax.servlet.Filter;
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import javax.servlet.FilterChain;
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import javax.servlet.FilterConfig;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import ro.fortsoft.pf4j.PluginWrapper;
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import com.gitblit.extensions.HttpRequestFilter;
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import com.gitblit.manager.IPluginManager;
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import com.gitblit.manager.IRuntimeManager;
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/**
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* A request filter than allows registered extension request filters to access
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* request data. The intended purpose is for server monitoring plugins.
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*
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* @author David Ostrovsky
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* @since 1.6.0
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*/
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@Singleton
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public class ProxyFilter implements Filter {
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private final IRuntimeManager runtimeManager;
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private final IPluginManager pluginManager;
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private final List<HttpRequestFilter> filters;
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@Inject
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public ProxyFilter(
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IRuntimeManager runtimeManager,
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IPluginManager pluginManager) {
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this.runtimeManager = runtimeManager;
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this.pluginManager = pluginManager;
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this.filters = new ArrayList<>();
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}
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@Override
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public void init(FilterConfig filterConfig) throws ServletException {
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filters.addAll(pluginManager.getExtensions(HttpRequestFilter.class));
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for (HttpRequestFilter f : filters) {
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// wrap the filter config for Gitblit settings retrieval
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PluginWrapper pluginWrapper = pluginManager.whichPlugin(f.getClass());
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FilterConfig runtimeConfig = new FilterRuntimeConfig(runtimeManager,
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pluginWrapper.getPluginId(), filterConfig);
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f.init(runtimeConfig);
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}
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}
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@Override
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public void doFilter(ServletRequest req, ServletResponse res, final FilterChain last)
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throws IOException, ServletException {
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final Iterator<HttpRequestFilter> itr = filters.iterator();
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new FilterChain() {
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@Override
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public void doFilter(ServletRequest req, ServletResponse res) throws IOException,
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ServletException {
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if (itr.hasNext()) {
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itr.next().doFilter(req, res, this);
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} else {
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last.doFilter(req, res);
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}
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}
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}.doFilter(req, res);
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}
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@Override
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public void destroy() {
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for (HttpRequestFilter f : filters) {
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f.destroy();
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}
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}
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}
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