codes.thischwa.c5c.FilemanagerConfigFilter.java Source code

Introduction

Here is the source code for codes.thischwa.c5c.FilemanagerConfigFilter.java

Source

/*
 * C5Connector.Java - The Java backend for the filemanager of corefive.
 * It's a bridge between the filemanager and a storage backend and 
 * works like a transparent VFS or proxy.
 * Copyright (C) Thilo Schwarz
 * 
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
package codes.thischwa.c5c;

import java.io.IOException;

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 javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import codes.thischwa.c5c.filemanager.FilemanagerConfig;
import codes.thischwa.c5c.requestcycle.FilemanagerConfigBuilder;

import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * Filter for the configuration files of the filemanager.<br/>
 * This enables the request-based (user-based) configuration. The implementation of
 * {@link FilemanagerConfigBuilder} will be used to build the configuration.<br/>
 * <br/>
 * <strong>Important:</strong> It must be ensured, that this filter will be initialized
 * *after* the {@link ConnectorServlet} (see the 'load-on-startup' tag). <br/>
 * <br/>
 * To register it in the web.xml the following entries should be used:
 * 
 * <pre>
 * {@code
 * <filter>
 *    <filter-name>ConfigFilter</filter-name>
 *    <filter-class>codes.thischwa.c5c.FilemanagerConfigFilter</filter-class>
 *    <load-on-startup>2</load-on-startup>
 * </filter>
 * <filter-mapping>
 *    <filter-name>ConfigFilter</filter-name>
 *    <url-pattern>/filemanager/scripts/*</url-pattern>
 * </filter-mapping>
 * }
 * </pre>
 */
public class FilemanagerConfigFilter implements Filter {
    private static Logger logger = LoggerFactory.getLogger(FilemanagerConfigFilter.class);

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        logger.info(String.format("*** %s sucessful initialized.", this.getClass().getName()));
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse resp = (HttpServletResponse) response;
        String path = req.getServletPath();
        if (path.contains("filemanager.config.js")) {
            // set some default headers 
            ConnectorServlet.initResponseHeader(resp);
            logger.debug("Filemanager config request: {}", path);
            FilemanagerConfig config = (path.endsWith(".default")) ? UserObjectProxy.getFilemanagerDefaultConfig()
                    : UserObjectProxy.getFilemanagerUserConfig(req);

            ObjectMapper mapper = new ObjectMapper();
            try {
                mapper.writeValue(resp.getOutputStream(), config);
            } catch (Exception e) {
                logger.error(String.format("Handling of '%s' failed.", path), e);
                throw new RuntimeException(e);
            } finally {
                IOUtils.closeQuietly(resp.getOutputStream());
            }
        } else {
            chain.doFilter(req, resp);
        }
    }

    @Override
    public void destroy() {
    }

}