/*
 *  Copyright (c) 2019, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 *  WSO2 Inc. licenses this file to you 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 org.wso2.carbon.apimgt.impl.filter;


import javax.servlet.Filter;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.FilterChain;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.io.FileInputStream;


public class URLMappingFilter implements Filter {

    private FilterConfig filterConfig;
    private String appPath = "./repository/deployment/server/jaggeryapps";
    private String replaceValue= "public";
    private String customeValue = "override";

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest request1 = (HttpServletRequest) request;
        File file = new File( appPath +
                request1.getRequestURI().replace(replaceValue, customeValue));
        boolean exists = file.exists();

        if (exists) {
            //init array with file length
            byte[] bytesArray = new byte[(int) file.length()];

            try (FileInputStream fis = new FileInputStream(file)) {
                fis.read(bytesArray); //read file into bytes[]
            }
            response.getOutputStream().write(bytesArray);
        } else {
            chain.doFilter(request, response);
        }
    }

    @Override
    public void destroy() {
        filterConfig = null;
    }
}
