I downloaded an addon that does this, I downloaded the addon from here. I just modified it to work better with my server configuration. I just have to find it again.
However, when someone posts a non SSL URL to an image, the system automatically caches the images and stores it on your server, and replaces the HTTP Image URL with the Cached SSL/HTTPS Image URL. So your site doesn't warn users of mixed unsecured content.
I will try to find it on here and post the link when I find it.
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