On 16 Jan 2014 at 15:02:10, Sergiu Dumitriu 
([email protected](mailto://[email protected])) wrote:

> On 01/16/2014 07:58 AM, [email protected] wrote:
> > Hi devs,
> >
> > I’ve just committed support for http://jira.xwiki.org/browse/XRENDERING-278 
> > (which allows copy pasting images in the WYSIWYG editor btw). However I’ve 
> > just realized (had forgotten) that my code will break image attachments to 
> > a subwiki named “data”:
> >
> > image:data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABHNCSVQICAgIfAhkiAAAAO9JREFUOE+lUrsNwjAUdCyWIBXjIEokVoCejgkyQ2gYAIkSsQUrUIUxwrund5bjX4OlyPG9u3v22Z2rjM1uWEtpkq//PC/fCs35UoHi/WGL8mTrErVsAJGJHU2KagGzHUi3I8iP+0s1nInXjBSPSfI/n2/vGTNFJZOVCRkYltdGl1FMRqmHYL0FFM6MjnFXaxCwNJMOZAbW6JyVkI1cbwcD3T5MGBjZLQxi8Lw9kp5iFFikUYwZr2dNQzQT7EavsDFOwl2ErNuIh5kgaX1E0bEyMTiZAcA0WAa26GSL7CUaHjJJz1wyqWLpe6gS/yn8AD9tcjFN7/ajAAAAAElFTkSuQmCC
> >
> > Of course the solution for a user is to prefix with “attach:”, to show that 
> > it’s an image coming from an attachment:
> >
> > image:attach:data:….
> >
> > We discussed this previously:
> > * Original thread: http://markmail.org/thread/vw3derowozijqalr
> > * This lead to this first VOTE which was not conclusive: 
> > http://markmail.org/thread/vw3derowozijqalr
> > * Which lead to another VOTE which was also not conclusive: 
> > http://markmail.org/thread/t2wb2xq7534qsshg (note that this thread contains 
> > 2 proposals, the last one beeing a choice between A) and B)).
> >
> > However we kind of agreed at the end that it would be acceptable to break 
> > backward compatibility (solution A in the last thread).
> >
> > So the question here:
> >
> > * Should I revert my change that I did for 5.4?
> > * Is it ok to break backward compatibility and thus add this in XWiki 
> > Syntax 2.1 as I did and document it on the release notes?
> >
> > Note that I could also relatively easily implement a new rendering 
> > configuration option (e.g. rendering.ignoreResourceTypes=user,data) which 
> > would be optional and that would allow to ignore some resource types (IMO 
> > this is slightly overkill).
> >
> > WDYT?
> >
> > Thanks
> > -Vincent
>  
> +1 for breaking backwards compatibility.
>  
> Would it be possible to also check if what's after "data:" starts with
> "image/"? The chances of having a "data" wiki, and a space with / in it
> are pretty slim, considering that / isn't quite working in both Tomcat
> and Apache HTTPD.

Yes good idea. I’ve committed it

With this in place the likelihood of a backward compatibility issue is close to 
0% so I think we’re safe to include this change in 5.4.

Thanks
-Vincent


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