** Changed in: mahara
    Milestone: 17.04.0 => None

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https://bugs.launchpad.net/bugs/1234582

Title:
  Can't display images in RSS feeds with protocol-relative URLs

Status in Mahara:
  Confirmed

Bug description:
  As described by Robert while investigating another bug report:
  https://bugs.launchpad.net/mahara/+bug/1219499/comments/5

  The problem where some images are not showing up is because they tend
  to be protocol relative urls to the images and the Mahara system tries
  to append a url to them but this makes the path incorrect.

  eg for slideshare (http://www.slideshare.net/rss/latest)

  There are image links in the feed like:

  
//cdn.slidesharecdn.com/ss_thumbnails/lptrnhc2008cbnnhtnghththutit360-130902225125-phpapp02-thumbnail-2.jpg

  and mahara sees this as a relative url and appends
  http://www.slideshare.net/ to the front if it which then makes

  
http://www.slideshare.net//cdn.slidesharecdn.com/ss_thumbnails/lptrnhc2008cbnnhtnghththutit360-130902225125-phpapp02-thumbnail-2.jpg

  which is an incorrect url and the image will not be found there

  Need to alter the code in htdocs/blocktype/externalfeed/lib.php from
  /src="(\/[^"]+)"/ to something that doesn't try and update protocol
  relative urls

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