Added errors on file size

[gautampunhani]

Similar to extension_white_list and extension_black_list, have added size_range.

[carloslopes]

@jnicklas does this have any chance to be merged? If does, i can work to close this issue

[taavo]

@bensie, what do you think about this one? On the one hand, file size validators are a lot more effective on the client side, in javascript, where they can actually prevent the upload from happening. But on the other hand it could be nice to easily guarantee nobody's dumping huge files on you.

[bensie]

I definitely think there is a place for it on the server-side, particularly when file uploads are permitted via an API.

I'm 👍 on this.

[taavo]

In kilobytes? Note units.

[carloslopes]

I think that here it should be in kilobytes, but it should be converted when showing the errors messages

ps: maybe i misunderstood your question

[taavo]

I agree with the conversion for error messages also. The more I think about it the more I'm into this pull, btw.

[carloslopes]

👍

[ibrahima]

I realize this is 10 years old but this PR is linked from the changelog, and it's not clearly documented in https://github.com/carrierwaveuploader/carrierwave/blob/master/lib/carrierwave/uploader/file_size.rb so I felt like it would be helpful to comment here.

It feels to me like if it's comparing to new_file.size isn't it comparing bytes? When I set a size_range the validation messages convert to human friendly units and it does seem like it's using bytes. I set the limit to 1024 and it allowed a file smaller than 1KB and when I tried a 4KB file it rejected it, with the error message "Validation failed: File File size should be less than 1 KB". (It does seem to go for the closest human-friendly unit, so if the limit is in MB or GB it reflects that.) So I think that the value here is in fact interpreted as bytes.

Submitted a tiny PR to update the doc comment here: #2662

ah yeah this is implicitly documented in #2199, but it would be nice to make it explicit.

[davidstosik]

Hello, any chance this gets merged? Are there any blockers?

[jnicklas]

Admittedly, it's been ages since I've looked into the internals in CarrierWave, but it used to be possible to use validates_size_of for this purpose, seems like the easier solution?

[davidstosik]

Easier, but not safe, as it would happen after processing images.
This PR would fail the validation before the image gets processed, which helps a lot as processing big images is demanding, and it may be the reason why one limits the file size.

[thiagofm]

👍 just needs the modifications that @taavo suggested