[xwiki-devs] [proposal] Move servlet filters out of the core

Hi devs, I propose to move servlet filters out of the old core to xwiki-container-servlet. There are 3 filters, com.xpn.xwiki.web.SetCharacterEncodingFilter com.xpn.xwiki.web.SavedRequestRestorerFilter com.xpn.xwiki.web.ActionFilter They are almost self-contained (except for ActionFilter, see a note later) and are easy to move. Moreover, SavedRequestRestorerFilter offers functionality to save the request, that might also be useful in other places (like csrf-token). There is (currently) no need for portlet filters, so moving filters into a separate module doesn't seem to be worth it. Since the filters are not used directly, I'd move them into org.xwiki.container.servlet.filters.internal and public methods used elsewhere into org.xwiki.container.servlet.filters. Note that xwiki-core would become dependent on xwiki-container-servlet (it currently depends on container-api), but it shouldn't be a problem. In more detail, * SetCharacterEncodingFilter would be moved as is to filters.internal. * SavedRequestRestorerFilter would be split into the actual filter and SavedRequestManager that would contain the static methods String getOriginalUrl(HttpServletRequest) String saveRequest(HttpServletRequest) String getRequestIdentifier() SavedRequestManager could also be a component, but it would make it more complicated to use from the filter. * ActionFilter should be moved to filters.internal too, but it uses XWiki.stripSegmentFromPath(String, String) to parse the URL and replace the action part by the stored value. There are 2 other copies of the URL parsing code that uses stripSegmentFromPath(...), in XWiki.getDocumentReference(...) and XWiki.getXWiki(...), I can think of 3 alternatives: 1. Leave ActionFilter in the core 2. Move URL parsing code into xwiki-url, i.e. add/implement missing methods to create XWikiURL from string representation and extract host, action, document reference and parameters from it. 3. Move stripSegmentFromPath(...) to xwiki-container-servlet too I'm +1 for 2, since it's the cleanest option. WDYT? Thanks, Alex