Page history and author audit function

Hi jahia list!

I have a question regarding versioning information for pages:

Is it possible to get the username of the publisher and the author of
a specific published state of a jahia page? We want to realize
something like:

1. Show every published version of a page since it's creation (as a
table for example)

2. Show the author & the publisher + the date for a specific version
of this page.

3. Don't show the actual changes (like a diff) but the commit message
which is used in the publish menu and the notification mail.

The contextual background of this is to give the users of a intranet
portal the possibility to see in what kind the page did change and who
did change it.

I'm hoping that there's some functionality that I can use from the
versioning functionality jahia allready uses to show this data. But I
did not see any link between author/publisher and a specific page
state. Also the commit message doesn't seem to be available for later
lookup. Is this true? Could you provide me with a starting point? Any
Helper classes or viewhelpers that I could use? Thanks in advance! =)

Cheers
Daniel Zimmermann