cryptosphere/cryptosphere

module Cryptosphere
  module Git
    module Resources
      class Refs < Lattice::Resource
        # Pack data header for the HTTP-based git-receive-pack service
        # TODO: roll this up with some other related code somewhere
        SERVICE_HEADER = "001f# service=git-receive-pack"

        provide_content_type 'application/x-git-receive-pack-advertisement' => :to_advertisement

        provide_encoding 'gzip'     => :encode_gzip
        provide_encoding 'identity' => :encode_identity

        def resource_exists?
          # TODO: check actual git repo name
          # For now only example.git will work
          return false unless request.path_info[:repo_id] == 'example.git'

          # Ensure the client is speaking the git protocol
          return false unless request.query['service'] == 'git-receive-pack'

          true
        end

        def to_advertisement
          response = []
          response << SERVICE_HEADER

          # TODO: this hardcodes an empty repository. Eventually we should
          # support more than just empty repositories.
          response << [
            "000000880000000000000000000000000000000000000000",
            "capabilities^{}\0",

            # TODO: We don't really have any of these capabilities yet ;(
            "report-status",
            "delete-refs",
            "side-band-64k",
            "quiet",
            "ofs-delta",
            "agent=git/1.8.1.6"
          ].join(' ')

          response << "0000"
          response.join("\n")
        end
      end
    end
  end
end