this post was submitted on 25 Aug 2023
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How exactly does Lemmy Universal Link Switcher work on Lemmy Post Links? (infosec.pub)
submitted 1 year ago by _thisdot@infosec.pub to c/programming@beehaw.org
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A post with id 1 in lemmy.world has a different id in lemmy.ml (or any instance). How do I get the post id in lemmy.ml?

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[โ€“] rikudou@lemmings.world 12 points 1 year ago* (last edited 1 year ago) (1 children)

Every post has an "activity pub id" (ap_id in the api) which is a URL to the post on its home instance. Every Lemmy instance can get a link to a post by its activity pub id.

The flow is:

  • parse the URL and get the numerical ID
  • call an api endpoint with post details (on the instance the link points to), which includes its activity pub id
  • call an api endpoint on your target instance to resolve the activity pub id to a local post (which includes its local ID)
  • construct a new URL in the form of https://[targetInstance]/post/[localID]
[โ€“] _thisdot@infosec.pub 2 points 1 year ago

Thanks! This was very helpful!