IWEncodingFilter.java

package com.idega.servlet.filter;

import java.io.IOException;
import java.util.logging.Logger;

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

import com.idega.idegaweb.IWMainApplication;
import com.idega.presentation.IWContext;
import com.idega.util.CoreConstants;
import com.idega.util.CoreUtil;
import com.idega.util.RequestUtil;
import com.idega.util.StringUtil;
import com.idega.util.expression.ELUtil;

/**
 *
 * This filter should always be the first filter in the filter chain. It sets
 * the correct encoding to the request and response that has to be done before
 * anything is written to the headers or gotten from the request.
 *
 * @author <a href="mailto:eiki@idega.is">Eirikur S. Hrafnsson</a>
 */
public class IWEncodingFilter implements Filter {

	@Override
	public void doFilter(ServletRequest myRequest, ServletResponse myResponse, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) myRequest;
		HttpServletResponse response = (HttpServletResponse) myResponse;

		IWContext.setCharactersetEncoding(request);

		setRequestResponseProvider(request, response);

		String viewStateParam = "javax.faces.ViewState";
		String viewStateParamValue = request.getParameter(viewStateParam);
		if (!StringUtil.isEmpty(viewStateParamValue)) {
			IWContext iwc = CoreUtil.getIWContext();
			if (iwc == null) {
				iwc = new IWContext(request, response, servletConfig == null ? request.getSession().getServletContext() : servletConfig.getServletContext());
			}

			if (!iwc.isLoggedOn()) {
				Logger.getLogger(getClass().getName()).info("User is not logged in, not allowing to use param '" + viewStateParam + "'");
				String redirectUri = IWMainApplication.getDefaultIWMainApplication().getSettings()
						.getProperty("view_state_param_redirect_page", CoreConstants.PAGES_URI_PREFIX);
				if (!StringUtil.isEmpty(redirectUri)) {
					Logger.getLogger(getClass().getName()).info("Redirecting to '" + redirectUri + "' because of parameter '" +
							viewStateParam + "' and it's value: " + viewStateParamValue);
					response.sendRedirect(redirectUri);
					return;
				}
			}
		}

		doDetectMobileBrowser(request);

		chain.doFilter(request, response);
	}

	private void doDetectMobileBrowser(HttpServletRequest request) {
		HttpSession session = request.getSession(false);

		String pageViewType = request.getParameter(CoreConstants.PARAMETER_PAGE_VIEW_TYPE);
		if (!StringUtil.isEmpty(pageViewType))
			session.setAttribute(CoreConstants.PARAMETER_PAGE_VIEW_TYPE, pageViewType);

		if (CoreConstants.PAGE_VIEW_TYPE_MOBILE.equals(pageViewType))
			return;
		if (CoreConstants.PAGE_VIEW_TYPE_REGULAR.equals(pageViewType))
			return;

		String userAgent = RequestUtil.getUserAgent(request);
		if (StringUtil.isEmpty(userAgent))
			return;

		userAgent = userAgent.toLowerCase();
		boolean mobileBrowser = userAgent.contains("ios") || userAgent.contains("iphone") || userAgent.contains("ipad") || userAgent.contains("ipod") ||
			userAgent.contains("android");
		if (mobileBrowser)
			session.setAttribute(CoreConstants.PARAMETER_PAGE_VIEW_TYPE, CoreConstants.PAGE_VIEW_TYPE_MOBILE);
	}

	private void setRequestResponseProvider(HttpServletRequest request, HttpServletResponse response) {
		RequestResponseProvider requestProvider = null;
		try {
			requestProvider = ELUtil.getInstance().getBean(RequestResponseProvider.class);
			requestProvider.setRequest(request);
			requestProvider.setResponse(response);
		} catch(Exception e) {}
	}

	private ServletConfig servletConfig;

	/*
	 * (non-Javadoc)
	 *
	 * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
	 */
	@Override
	public void init(FilterConfig config) throws ServletException {
		if (config instanceof ServletConfig) {
			servletConfig = (ServletConfig) config;
		}
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see javax.servlet.Filter#destroy()
	 */
	@Override
	public void destroy() {
	}

}