[dokuwiki] Re: Syntax Plugin: How to manipulate wiki content


On 10 Dec 2008, at 04:47, James Lin wrote:


Hi Guys,
I am trying to write a custom ACL plugin to restrict access to individual wiki pages, it works like this:
putting the tag {{restrict group=developers /restrict}} at the beginning of the wiki page. 

my problem is:
if the access is denied, I need to change the wiki page content to display some friendly message. However I don't know how to modify the content outside my syntax scope. if I use $renderer->doc .= "access denied", it only replace my syntax but not global content.
I know the builtin ACL does similar thing but I just don't know which internal function to use. Please help. 

Cheers

James Lin




My guess would be:
Handle your tag in metadata rather than html. Take a look at the Dublin Core, http://dublincore.org, for possible standard terms (dokuwiki metadata keys) that would be appropriate. "rights" and "accessRights" are possibilities. By having the information in the dokuwiki's page metadata it is easy for other code to check the metadata value (see p_get_metadata() function in inc/parserutils.php).
Your ACL backend or an action plugin would then check the page's metadata for the metadata keys and respond accordingly. If its an ACL backend you'll get DokuWiki's standard restricted access message. If its an action plugin, you'll need to review the event list (http://www.dokuwiki.org/devel:events_list ) to work out which event is most appropriate - possibly TPL_ACT_RENDER. Handling this properly as a plugin would also mean intervening in other dokuwiki actions where page links are hidden when the user does not have read access (e.g. search) probably via the SEARCH_QUERY_PAGELOOKUP event. 

Cheers,

Chris
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