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EDIT :: push_command.rb

# frozen_string_literal: true
require_relative "../command"
require_relative "../local_remote_options"
require_relative "../gemcutter_utilities"
require_relative "../package"

class Gem::Commands::PushCommand < Gem::Command
  include Gem::LocalRemoteOptions
  include Gem::GemcutterUtilities

def description # :nodoc:
    <<-EOF
The push command uploads a gem to the push server (the default is
https://rubygems.org) and adds it to the index.

The gem can be removed from the index and deleted from the server using the yank
command.  For further discussion see the help for the yank command.

The push command will use ~/.gem/credentials to authenticate to a server, but you can use the RubyGems environment variable GEM_HOST_API_KEY to set the api key to authenticate.
    EOF
  end

def arguments # :nodoc:
    "GEM       built gem to push up"
  end

def usage # :nodoc:
    "#{program_name} GEM"
  end

def initialize
    super "push", "Push a gem up to the gem server", :host => self.host

@user_defined_host = false

add_proxy_option
    add_key_option
    add_otp_option

add_option("--host HOST",
               "Push to another gemcutter-compatible host",
               "  (e.g. https://rubygems.org)") do |value, options|
      options[:host] = value
      @user_defined_host = true
    end

@host = nil
  end

def execute
    gem_name = get_one_gem_name
    default_gem_server, push_host = get_hosts_for(gem_name)

@host = if @user_defined_host
      options[:host]
    elsif default_gem_server
      default_gem_server
    elsif push_host
      push_host
    else
      options[:host]
    end

sign_in @host, scope: get_push_scope

send_gem(gem_name)
  end

def send_gem(name)
    args = [:post, "api/v1/gems"]

_, push_host = get_hosts_for(name)

@host ||= push_host

# Always include @host, even if it's nil
    args += [ @host, push_host ]

say "Pushing gem to #{@host || Gem.host}..."

response = send_push_request(name, args)

with_response response
  end

private

def send_push_request(name, args)
    rubygems_api_request(*args, scope: get_push_scope) do |request|
      request.body = Gem.read_binary name
      request.add_field "Content-Length", request.body.size
      request.add_field "Content-Type",   "application/octet-stream"
      request.add_field "Authorization",  api_key
    end
  end

def get_hosts_for(name)
    gem_metadata = Gem::Package.new(name).spec.metadata

[
      gem_metadata["default_gem_server"],
      gem_metadata["allowed_push_host"],
    ]
  end

def get_push_scope
    :push_rubygem
  end
end

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EDIT :: push_command.rb