Redmine

That's a good start but here are a few things that need to be changed:

• I'll prefer to keep only one resource for project files, which would be /projects/:project_id/files, so we should remove the alternate POST /projects/foo/versions/123/files to create a file associated to a version (POST /projects/foo/files with a version_id attribute will be used instead).

• POST /projects/:project_id/files should create a single file with the file attributes given in a "file" hash (instead of attachments / file_1 ), eg.

{ "file": {
  "filename": "foo",
  ...
}

• GET /projects/:project_id/files should include the names of author and version (if any), just like it's done for the issues, eg.:

  api.author(:id => file.author_id, :name => file.author.name)

• Maybe should simply use the AttachmentsHelper#render_api_attachment to format most of the file attributes

• We don't keep track of authors in the source code

• I hold the copyright for the Redmine source code, I can't include a source file that is copyrighted to a third-party in the core.

Here is the updated patch.
The expected JSON format is

{ "file": {
    "filename",
    ...
  }
}

I used the AttachmentsHelper#render_api_attachment, which I've modified to accept additional options (in order to diplay the version_id).
I can remove this modification if necessary.

Updated Patch from Hg attached. We are currently using on 3.3 with no issues.

Committed in r16109 with a few changes to the index response. Thanks.