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ðŸ“ auth
ðŸ“„ body_proxy.rb(1.3 KB)
ðŸ“„ builder.rb(8.56 KB)
ðŸ“„ cascade.rb(2.25 KB)
ðŸ“„ chunked.rb(3.3 KB)
ðŸ“„ common_logger.rb(3.12 KB)
ðŸ“„ conditional_get.rb(2.99 KB)
ðŸ“„ config.rb(410 B)
ðŸ“„ constants.rb(2.47 KB)
ðŸ“„ content_length.rb(806 B)
ðŸ“„ content_type.rb(695 B)
ðŸ“„ deflater.rb(5.51 KB)
ðŸ“„ directory.rb(6.02 KB)
ðŸ“„ etag.rb(1.87 KB)
ðŸ“„ events.rb(4.8 KB)
ðŸ“„ file.rb(167 B)
ðŸ“„ files.rb(5.66 KB)
ðŸ“„ head.rb(524 B)
ðŸ“„ headers.rb(2.96 KB)
ðŸ“„ lint.rb(36.09 KB)
ðŸ“„ lock.rb(573 B)
ðŸ“„ logger.rb(414 B)
ðŸ“„ media_type.rb(1.4 KB)
ðŸ“„ method_override.rb(1.45 KB)
ðŸ“„ mime.rb(32.69 KB)
ðŸ“„ mock.rb(63 B)
ðŸ“„ mock_request.rb(5.37 KB)
ðŸ“„ mock_response.rb(3.28 KB)
ðŸ“ multipart
ðŸ“„ multipart.rb(1.17 KB)
ðŸ“„ null_logger.rb(1.18 KB)
ðŸ“„ query_parser.rb(8.37 KB)
ðŸ“„ recursive.rb(1.78 KB)
ðŸ“„ reloader.rb(3.02 KB)
ðŸ“„ request.rb(24.57 KB)
ðŸ“„ response.rb(10.72 KB)
ðŸ“„ rewindable_input.rb(3.12 KB)
ðŸ“„ runtime.rb(870 B)
ðŸ“„ sendfile.rb(5.55 KB)
ðŸ“„ show_exceptions.rb(13.73 KB)
ðŸ“„ show_status.rb(3.58 KB)
ðŸ“„ static.rb(6 KB)
ðŸ“„ tempfile_reaper.rb(778 B)
ðŸ“„ urlmap.rb(2.81 KB)
ðŸ“„ utils.rb(21.1 KB)
ðŸ“„ version.rb(958 B)

Editing: conditional_get.rb

# frozen_string_literal: true

require_relative 'constants'
require_relative 'utils'
require_relative 'body_proxy'

module Rack

# Middleware that enables conditional GET using if-none-match and
  # if-modified-since. The application should set either or both of the
  # last-modified or etag response headers according to RFC 2616. When
  # either of the conditions is met, the response body is set to be zero
  # length and the response status is set to 304 Not Modified.
  #
  # Applications that defer response body generation until the body's each
  # message is received will avoid response body generation completely when
  # a conditional GET matches.
  #
  # Adapted from Michael Klishin's Merb implementation:
  # https://github.com/wycats/merb/blob/master/merb-core/lib/merb-core/rack/middleware/conditional_get.rb
  class ConditionalGet
    def initialize(app)
      @app = app
    end

# Return empty 304 response if the response has not been
    # modified since the last request.
    def call(env)
      case env[REQUEST_METHOD]
      when "GET", "HEAD"
        status, headers, body = response = @app.call(env)

if status == 200 && fresh?(env, headers)
          response[0] = 304
          headers.delete(CONTENT_TYPE)
          headers.delete(CONTENT_LENGTH)
          response[2] = Rack::BodyProxy.new([]) do
            body.close if body.respond_to?(:close)
          end
        end
        response
      else
        @app.call(env)
      end
    end

private

# Return whether the response has not been modified since the
    # last request.
    def fresh?(env, headers)
      # if-none-match has priority over if-modified-since per RFC 7232
      if none_match = env['HTTP_IF_NONE_MATCH']
        etag_matches?(none_match, headers)
      elsif (modified_since = env['HTTP_IF_MODIFIED_SINCE']) && (modified_since = to_rfc2822(modified_since))
        modified_since?(modified_since, headers)
      end
    end

# Whether the etag response header matches the if-none-match request header.
    # If so, the request has not been modified.
    def etag_matches?(none_match, headers)
      headers[ETAG] == none_match
    end

# Whether the last-modified response header matches the if-modified-since
    # request header.  If so, the request has not been modified.
    def modified_since?(modified_since, headers)
      last_modified = to_rfc2822(headers['last-modified']) and
        modified_since >= last_modified
    end

# Return a Time object for the given string (which should be in RFC2822
    # format), or nil if the string cannot be parsed.
    def to_rfc2822(since)
      # shortest possible valid date is the obsolete: 1 Nov 97 09:55 A
      # anything shorter is invalid, this avoids exceptions for common cases
      # most common being the empty string
      if since && since.length >= 16
        # NOTE: there is no trivial way to write this in a non exception way
        #   _rfc2822 returns a hash but is not that usable
        Time.rfc2822(since) rescue nil
      end
    end
  end
end

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Editing: conditional_get.rb

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