Something I haven't seen is an image proxy or cache extension.
Many sites in recent times make use of HTTPS for secure connections, however with the UGC nature of forums, it can be difficult to prevent mixed content. The official phpBB forums use Camo, however it is overkill for many situations, but also impossible for others.
Ideas on how such an extension may work:
- A simple proxy - Remote images in [img] tags are rewritten to proxy through the host.
- Attachments - Remote images are retrieved at submission and are added to that users attachments.
- Caching - Somewhat of a hybrid of the above, remote images are rewritten to proxy through host, but also served from the host for a short while. This is similar to how it's done on Xenforo.
Thanks for any consideration.