this post was submitted on 14 Jun 2023
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This would require a browser extension or a central redirection server (similar to how single sign on is implemented between multiple URLs). The central server approach won't really fit well with the decentralized concept, although that server only needs to know your Lemmy instance and will only redirect users.
A browser extension could easily inject some kind of button in the page, and it would be easy enough for the browser extension to know your own Lemmy instance. I'm not sure if there is an easy URL to a specific post on a certain instance though, for example this post is https://feddit.nl/post/39577 for me and does not contain any information that this post is actually on !lemmyworld@lemmy.world. Those post URLs work fine if your home instance is aware about the post, but won't work if nobody has subscribed to that community.
You should be able to see a very colorful button on every post and comment, this button will link to the post/comment on the instance it was sent from.
Ah, thanks! That works, and you can easily search for that link in your own Reddit instance, and it will fetch it to your home server if it was not yet available. That's actually a very nice feature. I had no idea what that colourful image was, but it makes sense when you know it is the Fediverse logo.
Why a browser addon? My first approach would be to have the client do the job. Link to the page via the current instance, and ask the server to fetch it if it doesn't exist.
This is about a user browsing on another Lemmy instance. For example, a user from lemmy.world receives a link on a chat app to a post on beehaw.org. Now he wants to reply to that post, to do so the user has to go to the same post on their home instance. Beehaw.org has no idea that the user has an account on lemmy.world, so they can't just redirect the user. It is very difficult for Lemmy instances to share this data, as browsers have built in protections to prevent websites from sharing common identifiers (those were used to track people over multiple websites).
A menu could be added where the user can select their instance, but that would still require Beehaw.org to know about the existence of the user's home instance. This could still give issues with smaller instances, that are not well federated with other instances.
Oh, I see. I was thinking of opening links within Lemmy.