Extension:SVGEdit

MediaWiki extensions manual

SVGEdit Release status: experimental
Implementation	User interface, Ajax
Description	In-browser vector graphics editing with SVG-edit
Author(s)	Brion Vibber (Brion VIBBERtalk)
MediaWiki	1.17+
License	GPL (extension), Apache (SVG-edit)
Download	Download snapshot (Git master) Git [?]: repo summary browse file tree commit history
Parameters $wgSVGEditEditor $wgSVGEditInline
Hooks used BeforePageDisplay MakeGlobalVariablesScript
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The SVGEdit extension provides in-browser creation and editing of uploaded SVG files using the very nice open-source SVG-edit widget. Try the demo here.

Batteries not included: Neither SVG-edit 2.5.1 nor 2.6 is included at present.

Current versions of most major browsers should work. Internet Explorer 8 and earlier will require Chrome Frame plugin even with SVG-edit 2.6. IE 9 and later only need Chrome Frame with SVG 2.5.1 or earlier

• "Edit drawing" tab and button added on File: pages for SVG images
• "SVG drawing" button added to WikiEditor advanced toolbar "insert" section to create new files conveniently while working on a page
  • file invocation is added to the text editor upon saving the file
  • currently the filename will be autogenerated from the name of the page being worked on

Installation[edit | edit source]

• Download and extract the file(s) in a directory called SVGEdit in your extensions/ folder. If you're a developer and this extension is in a Git repository, then instead you should clone the repository.
• Add the following code at the bottom of your LocalSettings.php:

require_once "$IP/extensions/SVGEdit/SVGEdit.php";

• Download SVGedit (see Configuration), and place it in .../extensions/SVGEdit/svg-edit
• Enable SVG support
• Done! Navigate to "Special:Version" on your wiki to verify that the extension is successfully installed.

Configuration[edit | edit source]

There is only one configuration option, which allows using an externally hosted instance of the SVG-edit editor br:

$wgSVGEditEditor = 'toolserver.org/~brion/svg-edit/svg-editor.html';

This can be used to run the editor off a faster static-file server, to provide a separate JavaScript security context by running the editor on another domain, or just to try a new version of the libraries.

Development[edit | edit source]

While the master code for this extension lives in Wikimedia's git repository, I also have a git repo where I may have some experimental branches:

 gitorious.org/mediawiki-svgedit/mediawiki-svgedit

Known bugs[edit | edit source]

• Actual editor issues belong upstream: code.google.com/p/svg-edit/
• Editing in Internet Explorer 9 requires using a development build of svg-edit 2.6; see #Configuration for switching from the built-in 2.5.1 release copy.

Todo[edit | edit source]

• add an editor trigger on SVG images visible in regular page views (partially implemented, not yet ready)
• allow saving without closing the editor
• autosave & recover drafts
• build a Gadget/user-script shim, allowing end-users to add editing to SVG-supporting wikis themselves (needs a JSONP proxy to load files for Wikimedia usage, since ApiSVGProxy is not in favor and there's been no motion to change cross-origin headers)
• extend 'import SVG file' and 'image' tools to allow pulling other images from the wiki

Notes[edit | edit source]

While SVG-edit is pretty capable, it's still a bit experimental and may damage existing files. Always check to make sure things still look right after a save; remember you can always revert to the previous version.

The editor widget is loaded in an <br> within the current page context; after saving, the parent page is reloaded which should show the new version of the file.

Those using a separate domain to store files may need to enable ApiSVGProxy to load up existing SVG files. Cross-origin headers on the file server should also be able to resolve this, but this needs testing.

Saving is implemented by POSTing an upload request to the API from an XMLHTTPRequest; this does not require any extra tweaks other than making sure SVG files are allowed for upload.

Security[edit | edit source]

Communication with the actual SVG-edit tool is done via the br's postMessage interface, which allows limited communication across domains. Specifying a separate location for the SVG-edit instance allows running the editor on another domain, and thus separate JavaScript context, to reduce the attack surface from potentially evil SVG code.

Be aware that using an instance of SVG-edit hosted by a third-party can expose your actual SVG image data to client or server code on that domain. If using an external editor instance on a private MediaWiki, you should ensure that you trust the domain that you use.

Related[edit | edit source]

• https://bugzilla.wikimedia.org/show_bug.cgi?id=38271