evazion 26ad844bbe downloads: refactor Downloads::File into Danbooru::Http. ...

Remove the Downloads::File class. Move download methods to
Danbooru::Http instead. This means that:

* HTTParty has been replaced with http.rb for downloading files.

* Downloading is no longer tightly coupled to source strategies. Before
  Downloads::File tried to automatically look up the source and download
  the full size image instead if we gave it a sample url. Now we can
  do plain downloads without source strategies altering the url.

* The Cloudflare Polish check has been changed from checking for a
  Cloudflare IP to checking for the CF-Polished header. Looking up the
  list of Cloudflare IPs was slow and flaky during testing.

* The SSRF protection code has been factored out so it can be used for
  normal http requests, not just for downloads.

* The Webmock gem can be removed, since it was only used for stubbing
  out certain HTTParty requests in the download tests. The Webmock gem
  is buggy and caused certain tests to fail during CI.

* The retriable gem can be removed, since we no longer autoretry failed
  downloads. We assume that if a download fails once then retrying
  probably won't help.

2020-06-20 00:20:39 -05:00

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