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diff --git a/jni/ruby/lib/rubygems/remote_fetcher.rb b/jni/ruby/lib/rubygems/remote_fetcher.rb
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+require 'rubygems'
+require 'rubygems/request'
+require 'rubygems/uri_formatter'
+require 'rubygems/user_interaction'
+require 'rubygems/request/connection_pools'
+require 'resolv'
+
+##
+# RemoteFetcher handles the details of fetching gems and gem information from
+# a remote source.
+
+class Gem::RemoteFetcher
+
+  include Gem::UserInteraction
+
+  ##
+  # A FetchError exception wraps up the various possible IO and HTTP failures
+  # that could happen while downloading from the internet.
+
+  class FetchError < Gem::Exception
+
+    ##
+    # The URI which was being accessed when the exception happened.
+
+    attr_accessor :uri
+
+    def initialize(message, uri)
+      super message
+      @uri = uri
+    end
+
+    def to_s # :nodoc:
+      "#{super} (#{uri})"
+    end
+
+  end
+
+  ##
+  # A FetchError that indicates that the reason for not being
+  # able to fetch data was that the host could not be contacted
+
+  class UnknownHostError < FetchError
+  end
+
+  @fetcher = nil
+
+  ##
+  # Cached RemoteFetcher instance.
+
+  def self.fetcher
+    @fetcher ||= self.new Gem.configuration[:http_proxy]
+  end
+
+  ##
+  # Initialize a remote fetcher using the source URI and possible proxy
+  # information.
+  #
+  # +proxy+
+  # * [String]: explicit specification of proxy; overrides any environment
+  #             variable setting
+  # * nil: respect environment variables (HTTP_PROXY, HTTP_PROXY_USER,
+  #        HTTP_PROXY_PASS)
+  # * <tt>:no_proxy</tt>: ignore environment variables and _don't_ use a proxy
+  #
+  # +dns+: An object to use for DNS resolution of the API endpoint.
+  #        By default, use Resolv::DNS.
+
+  def initialize(proxy=nil, dns=Resolv::DNS.new)
+    require 'net/http'
+    require 'stringio'
+    require 'time'
+    require 'uri'
+
+    Socket.do_not_reverse_lookup = true
+
+    @proxy = proxy
+    @pools = {}
+    @pool_lock = Mutex.new
+    @cert_files = Gem::Request.get_cert_files
+
+    @dns = dns
+  end
+
+  ##
+  # Given a source at +uri+, calculate what hostname to actually
+  # connect to query the data for it.
+
+  def api_endpoint(uri)
+    host = uri.host
+
+    begin
+      res = @dns.getresource "_rubygems._tcp.#{host}",
+                             Resolv::DNS::Resource::IN::SRV
+    rescue Resolv::ResolvError
+      uri
+    else
+      target = res.target.to_s.strip
+
+      if /\.#{Regexp.quote(host)}\z/ =~ target
+        return URI.parse "#{uri.scheme}://#{target}#{uri.path}"
+      end
+
+      uri
+    end
+  end
+
+  ##
+  # Given a name and requirement, downloads this gem into cache and returns the
+  # filename. Returns nil if the gem cannot be located.
+  #--
+  # Should probably be integrated with #download below, but that will be a
+  # larger, more emcompassing effort. -erikh
+
+  def download_to_cache dependency
+    found, _ = Gem::SpecFetcher.fetcher.spec_for_dependency dependency
+
+    return if found.empty?
+
+    spec, source = found.max_by { |(s,_)| s.version }
+
+    download spec, source.uri.to_s
+  end
+
+  ##
+  # Moves the gem +spec+ from +source_uri+ to the cache dir unless it is
+  # already there.  If the source_uri is local the gem cache dir copy is
+  # always replaced.
+
+  def download(spec, source_uri, install_dir = Gem.dir)
+    cache_dir =
+      if Dir.pwd == install_dir then # see fetch_command
+        install_dir
+      elsif File.writable? install_dir then
+        File.join install_dir, "cache"
+      else
+        File.join Gem.user_dir, "cache"
+      end
+
+    gem_file_name = File.basename spec.cache_file
+    local_gem_path = File.join cache_dir, gem_file_name
+
+    FileUtils.mkdir_p cache_dir rescue nil unless File.exist? cache_dir
+
+    # Always escape URI's to deal with potential spaces and such
+    # It should also be considered that source_uri may already be
+    # a valid URI with escaped characters. e.g. "{DESede}" is encoded
+    # as "%7BDESede%7D". If this is escaped again the percentage
+    # symbols will be escaped.
+    unless source_uri.is_a?(URI::Generic)
+      begin
+        source_uri = URI.parse(source_uri)
+      rescue
+        source_uri = URI.parse(URI.const_defined?(:DEFAULT_PARSER) ?
+                               URI::DEFAULT_PARSER.escape(source_uri.to_s) :
+                               URI.escape(source_uri.to_s))
+      end
+    end
+
+    scheme = source_uri.scheme
+
+    # URI.parse gets confused by MS Windows paths with forward slashes.
+    scheme = nil if scheme =~ /^[a-z]$/i
+
+    # REFACTOR: split this up and dispatch on scheme (eg download_http)
+    # REFACTOR: be sure to clean up fake fetcher when you do this... cleaner
+    case scheme
+    when 'http', 'https', 's3' then
+      unless File.exist? local_gem_path then
+        begin
+          verbose "Downloading gem #{gem_file_name}"
+
+          remote_gem_path = source_uri + "gems/#{gem_file_name}"
+
+          self.cache_update_path remote_gem_path, local_gem_path
+        rescue Gem::RemoteFetcher::FetchError
+          raise if spec.original_platform == spec.platform
+
+          alternate_name = "#{spec.original_name}.gem"
+
+          verbose "Failed, downloading gem #{alternate_name}"
+
+          remote_gem_path = source_uri + "gems/#{alternate_name}"
+
+          self.cache_update_path remote_gem_path, local_gem_path
+        end
+      end
+    when 'file' then
+      begin
+        path = source_uri.path
+        path = File.dirname(path) if File.extname(path) == '.gem'
+
+        remote_gem_path = correct_for_windows_path(File.join(path, 'gems', gem_file_name))
+
+        FileUtils.cp(remote_gem_path, local_gem_path)
+      rescue Errno::EACCES
+        local_gem_path = source_uri.to_s
+      end
+
+      verbose "Using local gem #{local_gem_path}"
+    when nil then # TODO test for local overriding cache
+      source_path = if Gem.win_platform? && source_uri.scheme &&
+                       !source_uri.path.include?(':') then
+                      "#{source_uri.scheme}:#{source_uri.path}"
+                    else
+                      source_uri.path
+                    end
+
+      source_path = Gem::UriFormatter.new(source_path).unescape
+
+      begin
+        FileUtils.cp source_path, local_gem_path unless
+          File.identical?(source_path, local_gem_path)
+      rescue Errno::EACCES
+        local_gem_path = source_uri.to_s
+      end
+
+      verbose "Using local gem #{local_gem_path}"
+    else
+      raise ArgumentError, "unsupported URI scheme #{source_uri.scheme}"
+    end
+
+    local_gem_path
+  end
+
+  ##
+  # File Fetcher. Dispatched by +fetch_path+. Use it instead.
+
+  def fetch_file uri, *_
+    Gem.read_binary correct_for_windows_path uri.path
+  end
+
+  ##
+  # HTTP Fetcher. Dispatched by +fetch_path+. Use it instead.
+
+  def fetch_http uri, last_modified = nil, head = false, depth = 0
+    fetch_type = head ? Net::HTTP::Head : Net::HTTP::Get
+    response   = request uri, fetch_type, last_modified
+
+    case response
+    when Net::HTTPOK, Net::HTTPNotModified then
+      response.uri = uri if response.respond_to? :uri
+      head ? response : response.body
+    when Net::HTTPMovedPermanently, Net::HTTPFound, Net::HTTPSeeOther,
+         Net::HTTPTemporaryRedirect then
+      raise FetchError.new('too many redirects', uri) if depth > 10
+
+      location = URI.parse response['Location']
+
+      if https?(uri) && !https?(location)
+        raise FetchError.new("redirecting to non-https resource: #{location}", uri)
+      end
+
+      fetch_http(location, last_modified, head, depth + 1)
+    else
+      raise FetchError.new("bad response #{response.message} #{response.code}", uri)
+    end
+  end
+
+  alias :fetch_https :fetch_http
+
+  ##
+  # Downloads +uri+ and returns it as a String.
+
+  def fetch_path(uri, mtime = nil, head = false)
+    uri = URI.parse uri unless URI::Generic === uri
+
+    raise ArgumentError, "bad uri: #{uri}" unless uri
+
+    unless uri.scheme
+      raise ArgumentError, "uri scheme is invalid: #{uri.scheme.inspect}"
+    end
+
+    data = send "fetch_#{uri.scheme}", uri, mtime, head
+
+    if data and !head and uri.to_s =~ /\.gz$/
+      begin
+        data = Gem.gunzip data
+      rescue Zlib::GzipFile::Error
+        raise FetchError.new("server did not return a valid file", uri.to_s)
+      end
+    end
+
+    data
+  rescue FetchError
+    raise
+  rescue Timeout::Error
+    raise UnknownHostError.new('timed out', uri.to_s)
+  rescue IOError, SocketError, SystemCallError => e
+    if e.message =~ /getaddrinfo/
+      raise UnknownHostError.new('no such name', uri.to_s)
+    else
+      raise FetchError.new("#{e.class}: #{e}", uri.to_s)
+    end
+  end
+
+  def fetch_s3(uri, mtime = nil, head = false)
+    public_uri = sign_s3_url(uri)
+    fetch_https public_uri, mtime, head
+  end
+
+  ##
+  # Downloads +uri+ to +path+ if necessary. If no path is given, it just
+  # passes the data.
+
+  def cache_update_path uri, path = nil, update = true
+    mtime = path && File.stat(path).mtime rescue nil
+
+    data = fetch_path(uri, mtime)
+
+    if data == nil # indicates the server returned 304 Not Modified
+      return Gem.read_binary(path)
+    end
+
+    if update and path
+      open(path, 'wb') do |io|
+        io.flock(File::LOCK_EX)
+        io.write data
+      end
+    end
+
+    data
+  end
+
+  ##
+  # Returns the size of +uri+ in bytes.
+
+  def fetch_size(uri) # TODO: phase this out
+    response = fetch_path(uri, nil, true)
+
+    response['content-length'].to_i
+  end
+
+  def correct_for_windows_path(path)
+    if path[0].chr == '/' && path[1].chr =~ /[a-z]/i && path[2].chr == ':'
+      path[1..-1]
+    else
+      path
+    end
+  end
+
+  ##
+  # Performs a Net::HTTP request of type +request_class+ on +uri+ returning
+  # a Net::HTTP response object.  request maintains a table of persistent
+  # connections to reduce connect overhead.
+
+  def request(uri, request_class, last_modified = nil)
+    proxy = proxy_for @proxy, uri
+    pool  = pools_for(proxy).pool_for uri
+
+    request = Gem::Request.new uri, request_class, last_modified, pool
+
+    request.fetch do |req|
+      yield req if block_given?
+    end
+  end
+
+  def https?(uri)
+    uri.scheme.downcase == 'https'
+  end
+
+  def close_all
+    @pools.each_value {|pool| pool.close_all}
+  end
+
+  protected
+
+  # we have our own signing code here to avoid a dependency on the aws-sdk gem
+  # fortunately, a simple GET request isn't too complex to sign properly
+  def sign_s3_url(uri, expiration = nil)
+    require 'base64'
+    require 'openssl'
+
+    unless uri.user && uri.password
+      raise FetchError.new("credentials needed in s3 source, like s3://key:secret@bucket-name/", uri.to_s)
+    end
+
+    expiration ||= s3_expiration
+    canonical_path = "/#{uri.host}#{uri.path}"
+    payload = "GET\n\n\n#{expiration}\n#{canonical_path}"
+    digest = OpenSSL::HMAC.digest('sha1', uri.password, payload)
+    # URI.escape is deprecated, and there isn't yet a replacement that does quite what we want
+    signature = Base64.encode64(digest).gsub("\n", '').gsub(/[\+\/=]/) { |c| BASE64_URI_TRANSLATE[c] }
+    URI.parse("https://#{uri.host}.s3.amazonaws.com#{uri.path}?AWSAccessKeyId=#{uri.user}&Expires=#{expiration}&Signature=#{signature}")
+  end
+
+  def s3_expiration
+    (Time.now + 3600).to_i # one hour from now
+  end
+
+  BASE64_URI_TRANSLATE = { '+' => '%2B', '/' => '%2F', '=' => '%3D' }.freeze
+
+  private
+
+  def proxy_for proxy, uri
+    Gem::Request.proxy_uri(proxy || Gem::Request.get_proxy_from_env(uri.scheme))
+  end
+
+  def pools_for proxy
+    @pool_lock.synchronize do
+      @pools[proxy] ||= Gem::Request::ConnectionPools.new proxy, @cert_files
+    end
+  end
+end
+