7 Jan
2008
7 Jan
'08
11:51 p.m.
For a current project, I would like to limit users in the way they use
images. I want to
1) allow all users to edit pages
2) disable file upload for all users except my 'ImageEditors' group
(i.e. no attachments)
3) make sure users only use images uploaded by an 'ImageEditors'
Unfortunately I found it very difficult to implement aforementioned
requirements in XWiki. XWiki does not implement a designated
'attachment' access level, turning off images is not trivial and file
upload can not be configured.
After creating a user group 'ImageEditors', I created two different
spaces, 'Main' and 'Images' and set the space rights for 'Images'
to
'view' for all users and to 'edit' for 'ImageEditors'. While all
users
can still edit 'Main'-space-pages, only 'ImageEditors' can edit
'Images'-space-pages (and thus upload attachments to these pages).
To restrict image use, I replaced the
com.xpn.xwiki.render.macro.ImageMacro with my own code (external jar)
that only renders image tags using attachments from the 'Images' space.
For every macro call, it checks if a page with the same name exists in
the 'Images' space and renders this (parallel) page's attachment (if
found). Since 'Main'-space-page attachments are ignored, only
attachments uploaded by 'ImageEditors' are published.
Finally, I customized the skin in a way that, in edit mode, images can
be conveniently picked from the respective (parallel)
'Images'-space-page and also removed all file upload skin code for
non-'ImageEditors'.
This works and meets my requirements with the minor flaw that all users
can still upload arbitrary files to 'Main'-space-pages when posting to
the upload URL directly.
----------
Is there an easier/better/simpler way of accomplishing the above?
I'd appreciate any comments.
Thank you,
Josef
8 Jan
8 Jan
12:19 a.m.
Josef Pfleger wrote:
For a current project, I would like to limit users in
the way they use
images. I want to
1) allow all users to edit pages
2) disable file upload for all users except my 'ImageEditors' group
(i.e. no attachments)
3) make sure users only use images uploaded by an 'ImageEditors'
Unfortunately I found it very difficult to implement aforementioned
requirements in XWiki. XWiki does not implement a designated
'attachment' access level, turning off images is not trivial and file
upload can not be configured.
After creating a user group 'ImageEditors', I created two different
spaces, 'Main' and 'Images' and set the space rights for 'Images'
to
'view' for all users and to 'edit' for 'ImageEditors'. While all
users
can still edit 'Main'-space-pages, only 'ImageEditors' can edit
'Images'-space-pages (and thus upload attachments to these pages).
To restrict image use, I replaced the
com.xpn.xwiki.render.macro.ImageMacro with my own code (external jar)
that only renders image tags using attachments from the 'Images' space.
For every macro call, it checks if a page with the same name exists in
the 'Images' space and renders this (parallel) page's attachment (if
found). Since 'Main'-space-page attachments are ignored, only
attachments uploaded by 'ImageEditors' are published.
Finally, I customized the skin in a way that, in edit mode, images can
be conveniently picked from the respective (parallel)
'Images'-space-page and also removed all file upload skin code for
non-'ImageEditors'.
This works and meets my requirements with the minor flaw that all users
can still upload arbitrary files to 'Main'-space-pages when posting to
the upload URL directly.
----------
Is there an easier/better/simpler way of accomplishing the above?
I'd appreciate any comments.
You can extend/override the
com.xpn.xwiki.user.impl.xwiki.XWikiRightServiceImpl class and register
it in xwiki.cfg, so that you can add the upload right. Now, if you
extend XWikiRightsServiceImpl, you won't need to separate the
attachments from the targeted documents.
You've probably done that already, but just to mention it, you can
disable the default attachment sections from the interface, like the
Attachments entry in the action menu, or the attachments area at the
bottom of the default view. You can also delete the attachments*.vm
templates from the skin to disable attachment displaying for users who
know the "right" URL.
Sergiu
9 Jan
9 Jan
10:47 p.m.
You can extend/override the
com.xpn.xwiki.user.impl.xwiki.XWikiRightServiceImpl class and register
it in xwiki.cfg, so that you can add the upload right. Now, if you
extend XWikiRightsServiceImpl, you won't need to separate the
attachments from the targeted documents.
I have extended the com.xpn.xwiki.user.impl.xwiki.XWikiRightServiceImpl
class to support an 'attachment' level and used the
xwiki.authentication.rightsclass parameter in xwiki.cfg. That works,
thank you!
The only /ugly/ part remaining is my patched
com.xpn.xwiki.render.macro.ImageMacro. Is there another way to prevent
users from using external image urls?
10 Jan
10 Jan
12:11 a.m.
Josef Pfleger wrote:
Well, if you set the proper rights, users will be able to upload images
only in the space you allow them to. But you cannot prevent smart users
from using images from other sources than attachments, as they can enter
HTML <img> tags.
So, as far as the image macro is concerned, you don't have to patch it
if attachments can only be posted in one space. You can also update the
tinymce files/velocity templates so that the wysiwyg editor displays
only images from a certain place, and the users don't see things they
cannot use, anyway.
Sergiu
You can
extend/override the
com.xpn.xwiki.user.impl.xwiki.XWikiRightServiceImpl class and register
it in xwiki.cfg, so that you can add the upload right. Now, if you
extend XWikiRightsServiceImpl, you won't need to separate the
attachments from the targeted documents.
I have extended the com.xpn.xwiki.user.impl.xwiki.XWikiRightServiceImpl
class to support an 'attachment' level and used the
xwiki.authentication.rightsclass parameter in xwiki.cfg. That works,
thank you!
The only /ugly/ part remaining is my patched
com.xpn.xwiki.render.macro.ImageMacro. Is there another way to prevent
users from using external image urls?
12:42 a.m.
New subject: [xwiki-users] Re stricting Images
Sergiu Dumitriu-2 wrote:
But you cannot prevent smart users from using images from other sources
than attachments, as they can enter HTML tags.
Yes I can and I want to. To
achieve this, my skin only renders
$doc.EscapedContent.
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Sent from the XWiki- Users mailing list archive at Nabble.com.
12:07 p.m.
New subject: [xwiki-users] Re stricting Images
j05ef wrote:
Sergiu Dumitriu-2 wrote:
Ah, nice trick.
About the ImageMacro, I guess we could use a platform feature that
restricts using images only from some spaces. I imagine this in the
following way:
- there's a setting in xwiki.cfg, like
xwiki.render.image.allowedSpaces=Main,Uploads
- The Images macro reads this property and checks if the document is in
the right space
- There could be another configuration that lists not the allowed
spaces, but the disabled ones, which would be better in some cases, like
xwiki.render.image.disabledSpaces=XWiki,Private
I think you have the proper skills to implement this, and it would be
nice to share it with the community, so could you make a Jira issue for
this (jira.xwiki.org) and give a patch?
Thanks,
Sergiu
But you cannot prevent smart users from using
images from other sources
than attachments, as they can enter HTML tags.
Yes I can and I want to. To
achieve this, my skin only renders
$doc.EscapedContent. 
12:14 p.m.
New subject: [xwiki-users] Re stricting Images
On Jan 10, 2008, at 12:07 PM, Sergiu Dumitriu wrote:
j05ef wrote:
I don't understand the need for this in the platform since it looks to
me a bit too specific a need (unless I don't understand something).
I'd rather we have something more generic that encompasses this use
case. I may be mistaken though.
-Vincent
Sergiu Dumitriu-2 wrote:
Ah, nice trick.
About the ImageMacro, I guess we could use a platform feature that
restricts using images only from some spaces. But you cannot prevent smart users from using
images from other
sources
than attachments, as they can enter HTML tags.
Yes I can and I want to. To
achieve this, my skin only renders
$doc.EscapedContent. I imagine this in the
following way:
- there's a setting in xwiki.cfg, like
xwiki.render.image.allowedSpaces=Main,Uploads
- The Images macro reads this property and checks if the document is
in
the right space
- There could be another configuration that lists not the allowed
spaces, but the disabled ones, which would be better in some cases,
like
xwiki.render.image.disabledSpaces=XWiki,Private
I think you have the proper skills to implement this, and it would be
nice to share it with the community, so could you make a Jira issue
for
this (jira.xwiki.org) and give a patch?
Thanks,
Sergiu
6191
days inactive
6194
days old
6 comments
4 participants
participants (4)
-
j05ef -
Josef Pfleger
-
Sergiu Dumitriu -
Vincent Massol