Link quality checker for comment/node bodies

Someone asked me how they can prevent a malicious user from adding a comment or node with a link to malware. They are concerned that while the editorial staff is asleep someone will add a link with text like "install this software."

One solution I had was to use public black lists to identify links that point to malware.

• Have an interface to select which content types should be checked and whether comments should be checked
• in hook_node_insert/hook_comment_insert parse the content for links
• Use Google Safe Browsing API and other similar blacklists to identify spam links.
• Either reject, or mark as "not published" any content that fails the checks

I don't plan to work on this right now, but it seems like a fun idea.