Re: [xmlblaster] Msg Filter Plugin on Disptch?

[Michele <michele at laghi.eu>]

Hi,
I think there is also the following dispatch plugin as an option:
http://www.xmlblaster.org/xmlBlaster/doc/requirements/dispatch.control.plugin.html


It is a bit more complicated than the most plugins but offers you more
possibilities.

Regards
Michele

Marcel Ruff wrote:
> David R Robison wrote:
>> What I want is to write a plugin that will filter messages dispatched
>> by client ID. For example, when a message is published and delivered
>> to tow subscribing clients (Dan and Dave) the plugin would deliver the
>> message unchanged to Dan but modify the message (removing sensitive
>> information) when delivering it to Dave. Is this possible with
>> xmlBlaster 1.4? 
> The mime plugins can't change the message content as they reference the
> original message 'meat'
> and a change in the plugin affects all others as well:
> http://www.xmlblaster.org/xmlBlaster/doc/requirements/mime.plugin.accessfilter.html
> 
> Note that the mime plugin is executed by the publisher thread during
> pushing
> the message into the client specific callback queue.
> 
> You plugin must be behind the callback queue, only the security plugin is a
> clone of the original (reference counted) message - so this is the place
> to go:
> See
> http://www.xmlblaster.org/xmlBlaster/doc/requirements/security.development.serverPlugin.howto.html
> 
> which is a bit outdated.
> 
> The best place to look is into the htpasswd or the ldap plugin:
> See
> org.xmlBlaster.authentication.plugins.htpasswd.Session.java:exportMessage()
> Here you can intercept the message, check it and manipulate it.
> 
> regards
> Marcel
> 
> 
>> Another approach would be to modify the message as it forwarded
>> between nodes in a cluster. If the domain master is node A and there
>> are two slaves, B and C, then the plugin would pass the messaged
>> unchanged to node B but modify them when forwarding them to node C.
>> Privileged users would then connect to node B and unprivileged users
>> to node C. Are either approaches feasible? Any other suggestions?
> You can achieve this by the above described authentication plugins or
> by specific publish plugins
> (http://www.xmlblaster.org/xmlBlaster/doc/requirements/mime.plugin.publishfilter.html)
> 
> 
> regards
> Marcel
>>
>> David
>>
>