Redmine

Hi @Go MAEDA,
in my opinion, the fix in #10832 is wrong. It breaks the concept of streaming file uploads https://github.com/redmine/redmine/blob/master/app/models/attachment.rb#L126

however, the proposed patch breaks FCGI. I've attached a test case.

unlike other request handlers, CGI uses a rewindable input, that doesn't support the #size method. In theory, the only way how to determine the file size is to read the content first. The content should be streamed into a tempfile not into a memory.
https://github.com/rack/rack/blob/master/lib/rack/rewindable_input.rb

the second option is to rely on the CONTENT-LENGTH header, but it might not be accurate or it could be faked.

after some investigation, I found that Rails actually relies on the header
https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/http/request.rb#L327

this means that FCGI is currently broken if an invalid CONTENT-LENGTH is provided. Note that most web-browsers and curl do send this header by default.

I'm wondering why anyone wants to use FCGI these days, they're definitely better options. We should try to fix it if possible, but the original patch #10832 broke other webservers that behave correctly.

I think that the problem with the size can be solved as suggested by Pavel by getting the size after data are stored into the filesystem. See the patch.

there're validations for size before the file is actually uploaded.

let's choose a simpler approach. These patches should be commited:
big_files_upload.diff
10-patches.rb.patch
attachments_test.rb.patch

it passes all tests.

Pavel Rosický wrote:

let's choose a simpler approach. These patches should be commited:
big_files_upload.diff
10-patches.rb.patch
attachments_test.rb.patch

Thank you. I have merged the three patches and fixed RuboCop offenses: 33752.patch

Committed the patch. Thank you.