001// Copyright 2008 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.internal.services;
016
017import org.apache.tapestry5.services.HttpServletRequestFilter;
018import org.apache.tapestry5.services.HttpServletRequestHandler;
019
020import javax.servlet.http.HttpServletRequest;
021import javax.servlet.http.HttpServletResponse;
022import java.io.IOException;
023import java.util.Collection;
024import java.util.regex.Pattern;
025
026public class IgnoredPathsFilter implements HttpServletRequestFilter
027{
028    private final Pattern[] ignoredPatterns;
029
030    public IgnoredPathsFilter(Collection<String> configuration)
031    {
032        ignoredPatterns = new Pattern[configuration.size()];
033
034        int i = 0;
035
036        for (String regexp : configuration)
037        {
038            Pattern p = Pattern.compile(regexp, Pattern.CASE_INSENSITIVE);
039
040            ignoredPatterns[i++] = p;
041        }
042    }
043
044    public boolean service(HttpServletRequest request, HttpServletResponse response, HttpServletRequestHandler handler)
045            throws IOException
046    {
047        // The servlet path should be "/", and path info is everything after that.
048
049        String path = request.getServletPath();
050        String pathInfo = request.getPathInfo();
051
052        if (pathInfo != null) path += pathInfo;
053
054
055        for (Pattern p : ignoredPatterns)
056        {
057            if (p.matcher(path).matches()) return false;
058        }
059
060        // Not a match, so let it go.
061
062        return handler.service(request, response);
063    }
064}