package com.day.cq.filter;

import org.osgi.service.component.ComponentContext;

import javax.servlet.*;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.util.Dictionary;

/**

* The <code>NoExtensionRedirectFilter</code> is a request filter, which hooks

* itself into the handling of requests without extension and sends an external

* redirect the user to the same URL with ".html" appended

*

* @scr.component label="Day - No Extension Redirect Filter" description="Filter that handles requests which are missing the extension" immediate="true"

* @scr.property name="filter.scope" value="request" private="true"

* @scr.service

*/

public class NoExtensionRedirectFilter implements Filter {

/**

* @scr.property label="Filter Enabled" description="Setting this property enables this filter." type="Boolean"

*/

private static final String NOEXTENSIONREDIRECTFILTER_ISENABLED = "noextensionredirectfilter.isenabled";

private Boolean noExtensionRedirectFilterIsEnabled = false;

/**

* A component's implementation class may optionally implement an activate method.

* If a component implements this method, this method will be called when a component configuration is activated to

* provide the component instance's Component Context object.

*

* @param context Component Context object is used by a component instance to interact with its execution

* context including locating services by reference name.

* @see {@link org.osgi.service.component.ComponentContext}

*/

protected void activate(ComponentContext context) {

setup(context);

}

/**

* This method sets up and initializes the service.

*

* @param context The {@link org.osgi.service.component.ComponentContext} provided by the ContentItemServiceImpl#activate()}

* method.

*/

private void setup(ComponentContext context) {

/**

* Extract the configuration properties from the component context as provided

* by the felix framework.

*/

Dictionary properties = context.getProperties();

noExtensionRedirectFilterIsEnabled = (Boolean) properties.get(NOEXTENSIONREDIRECTFILTER_ISENABLED);

if (noExtensionRedirectFilterIsEnabled == null)

noExtensionRedirectFilterIsEnabled = false;

}

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

try {

// get HTTP requests

HttpServletRequest httpRequest = (HttpServletRequest) servletRequest;

HttpServletResponse httpResponse = (HttpServletResponse) servletResponse;

// get URI via HTTP request cast

String uri = httpRequest.getRequestURI();

// only filter if enabled and request not for some special URIs

if (noExtensionRedirectFilterIsEnabled && !"/".equals(uri) && !"/cf".equals(uri) && uri.indexOf("/bin") != 0) {

// check if request ends with slash -> redirect /xy/ to /xy.html

if (uri.endsWith("/")) {

httpResponse.sendRedirect(uri.substring(0, uri.length() - 1) + ".html");

} else {

// get last part of the URI

int behindlastSlashPosition = uri.lastIndexOf("/") + 1;

String lastUriPart = uri.substring(behindlastSlashPosition);

// check if request is missing extension -> redirect /xy to /xy.html

if (lastUriPart.indexOf(".") == -1) {

httpResponse.sendRedirect(uri + ".html");

}

// normal URI -> continue regular filtering chain

else {

filterChain.doFilter(servletRequest, servletResponse);

}

}

}

// this filter did not apply -> continue regular filtering chain

else {

filterChain.doFilter(servletRequest, servletResponse);

}

}

// exception -> continue regular filtering chain

catch (Exception e) {

filterChain.doFilter(servletRequest, servletResponse);

}

}

/**

* INIT

* Does nothing. This filter has not init requirement.

*/

public void init(FilterConfig filterConfig) throws ServletException {

}

/**

* DESTROY

* Does nothing. This filter has not destroyal requirement.

*/

public void destroy() {

}

}