littled.net

An addendum to the problems I was having with Plone and Flash Player 10. Looks like another problem occurs with Opera if you change the content disposition header to “inline”. Basically, screeds of nonsense displaying instead of the Flash movie or the fall-back image. I’m not sure how widespread this problem is and I’m not prepared to do lots of testing but for the record this was happening with Plone 2.5.3 / SWFObject to embed the Flash file.  Various versions of Opera were tested — for instance I’m running version 9.10 on Windows.

I got round it with a bit of old-fashioned browser detection. Basically, Opera’s quite happy to have the content-disposition header left alone, so I needed a direct path to the Flash file for Opera and a path that took in my header setting script for everyone else:

if (navigator.userAgent.indexOf('Opera')>-1) {
   swfurl = '&dtml-portal_url;/path/to/flash/myflash.swf' }  else {
   swfurl = '&dtml-portal_url;/path/to/flash/showflash?flashvid=myflash.swf'
}
swfobject.embedSWF(swfurl, "my-dom-id", "435", "290", "9.0.115");

Not sure why Opera should behave differently to other browsers here.

Another pyrrhic victory maybe, but something that has made me exceptionally happy this afternoon. Basically, yesterday I upgraded my version of Flash Player to version 10 only to find that the Flash files on our Plone-powered site no longer worked.

The lovely folks at SWFObject helped to identify why this was happening — nothing to do with SWFObject at all but the fact that Flash Player 10 implements some new security “features”. I managed to isolate it to the fact that Plone serves up ATFiles with the header, “Content-Disposition: attachment”. Flash Player 10 ignores files served up with this header, so you need to override this and set it to “Content-Disposition: inline;”.

I came up with this solution which may not be overly elegant but at least it works. I created a skin-level Python script that sets response headers before returning the file:

showflash.py

request = container.REQUEST
RESPONSE =  request.RESPONSE
flashvid = request['flashvid']
cd = ‘inline; filename=%s’ %(context.id)
RESPONSE.setHeader(’Content-Disposition’, cd)
return context[flashvid]

Then, when I embed the video with SWFObject I call it thus,

<script type="text/javascript">
   swfobject.embedSWF("&dtml-portal_url;/path/to/flash/showflash?flashvid=myflash.swf", "my-dom-id", "435", "290", "9.0.115");
</script>

This may be better handled by a product like Plone4Artists Video but it certainly works as a fix for us.