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Don't allow double-posting of certain content types

Jamie Tanna requested to merge feature/deduplicate into develop

To prevent me from re-submitting certain types of content - namely those that I don't feel like I want to repeat - bookmarks/likes/reposts/rsvps.

We can utilise the new endpoint on the site https://www.jvt.me/content-deduplication.json which lets us know what content is already there:

{
  "https://www.reddit.com/r/apexlegends/comments/eynsya/todays_patch_notes_leaked/": [
    {
      "kind": "bookmarks",
      "url": "https://www.jvt.me/mf2/2020/02/...../"
    },
    {
      "kind": "likes",
      "url": "https://www.jvt.me/mf2/2020/02/m3xdk/"
    }
  ]
}

This will then allow the Micropub server to look up a given URL, and if it's found on the site, it then can determine whether it has a conflict for the given post, and then return that URL, otherwise allow creating it again.

But, due to the time lag between pushing a piece of content and the site rebuilding, we can't always rely on it in the case that we re-submit in a short period of time.

In this case we add an in-memory cache of posts that allows immediate feedback, before we have them live.

Closes #24 (closed).

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