Added support for acting like a Chocolatey server

[jgagnaire]

Cherry-picked Mizipzor's contributions from unmerged PR, and added support for 'choco install' command

Original description:

Added support for acting like a Chocolatey server.

This includes rudimentary support for api v2 and OData.
Lifted a lot of the core logic from https://github.com/ai-traders/BaGet.
Created Legacy namespace and tried to keep everything contained, would
prefer if Choco added nuget api v3 support.

Closes Issue(s)

#43

At least partially, OData queries can be very expressive, I dont know to what extent old nuget clients use it.

Motivation

Need it, and want to reuse the same server software between nuget and choco.

[rbicker]

Hi @jgagnaire
Thanks for your work! I wanted to test your branch but could not get it to work. Sorry if I am being stupid here but I cannot figure out which url to use as source for the choco command (-s param)?
I tried /v3/index.json, /v2/, all the new paths listed in the index.json... but it does not seem to work for me.
Thanks

[jgagnaire]

Hi @rbicker ! I was using this patch with the following command:
choco install chocolatey --source "https://your.repo.url/v2" -y --force
Hope it helps :)

EDIT:
It has been a while now, but if I remember correctly, it will not work if the URL has a trailing slash "/v2/" - it should instead end with "/v2" only

[jadestorm]

Hi @jgagnaire this is great! I'm aiming to shut down my current chocolatey server in lieu of something I can run on Linux and BaGet was really simple to set up and well looks nice =) However I then ran into it not working with chocolatey. I am not using your patch in production and it's working very well. So long story short, @loic-sharma this appears to be a great start!

What all other support would this theoretically need? list/search? perhaps some form of update unless that is basically handled by list/search. I wouldn't necessary bother with push as it's trivial to use the v3 api tools to handle a push with a separate tool. chocolatey integrates really well with Puppet for us though so I need it for that functionality.

Anyway, I really just wanted to say thumbs up, this is working well. =D

[samhocevar]

If anyone’s using this patch, master has diverged a lot and this PR no longer merges cleanly, so I merged @jgagnaire’s branch here: https://github.com/loic-sharma/BaGet/compare/master...samhocevar:feature/apiv2?expand=1

[gep13]

We, the Chocolatey Team, are currently working on a new release of Chocolatey, which will include support for the NuGet V3 specification. This is currently available in a beta format, and it should allow you to use Baget and Chocolatey together. If anyone is interested in this, it would be great if you could take the beta for a spin, and let us know any feedback. Feedback can be provided here:

chocolatey/choco#2995

Thanks!