The file router was starting to get out of hand, so I've done my best to
simplify it and get ahead of more spaghetti. As part of this, tidied up
some other code and added some much-needed comments and constants to
make things more readable. ObjectInfo() is much more useful as well,
determing if a file exists, if it's a directory and the location.
Feeling other bits of the project can be simplified, but mostly been
focused on the file providers and associated router.
Implemented a few new functions to handle the differences between local
and remote files - local files will be served (best it can be) with
ServeContent(), while remote files will be passed through from the
response body directly to the response writer. This isn't a very elegant
solution right now, but hoping to refactor this approach and simplify
the decision logic. However, serving files from local disks is much
better, including improvements to video files and generally better
handling of metadata.
Also some small tweaks to the frontned to align things a little nicer.
Added DELETE handler to files endpoint for deleting files and
directories, along with new handling for creating directories, as
specified with the `X-NAS-Type` header - if this is set to "directory",
a new directory is created with the path of the request. Otherwise, an
attempt to parse the file from form data is done as before.
Also added buttons to interact with the new functionality in the default
frontend.
Making some improvements to the future maintainability of the project,
namely in the form of tests. Also implemented a new "dist" command to
the Makefile that packs up the binaries, and will eventually be expanded
to do more legwork when prepping for a release.
Updated file providers to use io.Reader over an explicit multipart file,
and removed the handler in favour of a plain filename, since that was
it's primary purpose.
