/**
* appends memento timegate link to all resources, that are accessed via GET on resource
* webservice
*
* @param servletRequest
* @param servletResponse
* @param filterChain
* @throws IOException
* @throws ServletException
*/
@Override
public void doFilter(
ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException {
if (servletRequest instanceof HttpServletRequest) {
HttpServletRequest request = (HttpServletRequest) servletRequest;
// memento is only for reading
if (request.getMethod().equals("GET") || request.getMethod().equals("HEAD")) {
HttpServletResponse response = (HttpServletResponse) servletResponse;
URL resource = getResourceURL(request);
// build timegate link
if (resource != null) {
response.addHeader(
"Link",
"<"
+ MementoUtils.timegateURI(resource.toString(), configurationService.getBaseUri())
+ ">; rel=\"timegate\","
+ "<"
+ MementoUtils.timemapURI(resource.toString(), configurationService.getBaseUri())
+ ">; rel=\"timemap\"");
}
filterChain.doFilter(servletRequest, response);
return;
}
}
filterChain.doFilter(servletRequest, servletResponse);
}
