Comment on Image upload error?
threelonmusketeers@sh.itjust.works 1 month agoWow, that’s some amazing digital detective work!
I haven’t investigated that extra data much.
It might be part of a ‘capture the flag’ game, or not.
Huh, interesting!
If you would indulge me, I have a few additional questions and suggestions:
Q1: Do you know if it would be possible to implement tools to detect and discard invalid data automatically?
metadata is stripped so people don’t unwittingly share their geolocation
Good to know; I had wondered about how metadata was handled.
Q2: Is metadata stripping unique to this server, or a Lemmy-wide standard?
If I recall, the size limit is 5M.
Q3: Is this limit set on a per-server basis, or a Lemmy-wide standard?
Q4:Would it be possible to implement automatic compression of large images?
Most modern phone cameras routinely take larger photos than 5MB.
Just some off-the-cuff suggestions, and I’m not even sure whether they would be best implemented by the instance or the platform.
Thanks for all of your help already!
InEnduringGrowStrong@sh.itjust.works 1 month ago
A1: probably, although that’s more processing power. The tool I used to fix it would have outputted a second image file if the extra data had been an image, which is then a weird case to handle. (Upload both? Make 2 links?) Certainly, it could output a better error message though.
A2: Should be lemmy-wide, although technically a malicious server could disable that somehow, which I think would only affect their local users. ie: don’t make an account on a server you don’t trust.
A3: It is a server specific setting. It’s easy enough to change the setting. Bigger limits uses more storage which costs money
A4: Possible, I would think. No idea if that’s ever on the devs’ roadmap. I think that would be added to the pict-rs code which is then used by the lemmy server.
Both are open source projects, so an instance implementing this could then share the code so it’s eventually a feature for everyone.
I’ve ran into bugs before on some public image host I don’t remember where it wouldn’t strip metadata if you uploaded an album. It’s probably a good practice to strip metadata before uploading, although much less convenient. I double-check that it still works here from time to time, doubly so after upgrading versions.