this post was submitted on 04 Jul 2023
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Not to sound harsh or anything, but those of you saying that it's okay that all this data is public are insane. This completely goes against the entire philosophy of the Fediverse and FOSS in general. The reason we all are fleeing from Big Tech is because they collect so much data on us. At least, they keep it hidden from public view. This is a major issue in my opinion, and needs to be addressed ASAP before we claim to have superior platforms on the Fediverse. Why can't this data at least be encrypted?
I don't think it's possible to encrypt the data.
Say we have a rogue user that sends to the server multiple upvote requests for the same comment, how can the server reject the subsequent requests? After all, we can't let a user upvote a post or comment multiple times.
If that data is encrypted, the server cannot tell whether the user has upvoted a comment before.
There might be possible technical solutions to this using hashing. Hashing is like encryption in that the original cannot be extracted, but the hashed result is unique.
For example, a solution would be to have a VOTES table with an indexed column that is a hash of a combination of the user ID, post ID, (and perhaps another "salt", not sure). When a vote is made, the VOTES table is checked that the record (vote) does not already exist, gets an insert, and then a COUNTER is triggered for the actual vote count. (COUNTER is a db command that simply updates a counter). The hash would prevent multiple votes from the same user (as the salted hash is unique), and it would also prevent identifying who the user is from the table.
Yeah, I admit that sounds reasonable.
Although that still leaves the question of "is it scalable/performant?" on the table... Lemmy already suffers a lot from server overloading, adding cryptographic hashing (anything less than that is not going to ensure uniqueness/true anonymity) to each act of voting surely isn't going to help.
Hashing is a normal part of the web, it's easily scalable.
I really don't even think the votes table would need to itself be federated; it could just be on the user's instance. Upvote/downvote would be a call, but it should really only require the post or comment ID and voter instance. If an instance spams votes, those upvotes/downvotes could be deleted and the instance defederated
Still you can easily and quickly check if a user has voted on a particular post. While your method makes the tracking process quite a bit slower, it doesn't make it unrealistic. There just aren't that many users and posts as is the case with passwords. Still 100% better than the current approach, I hope this gets implemented.