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ðŸ“ ..
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: deflater.rb

# frozen_string_literal: true

require "zlib"
require "time"  # for Time.httpdate

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

module Rack
  # This middleware enables content encoding of http responses,
  # usually for purposes of compression.
  #
  # Currently supported encodings:
  #
  # * gzip
  # * identity (no transformation)
  #
  # This middleware automatically detects when encoding is supported
  # and allowed. For example no encoding is made when a cache
  # directive of 'no-transform' is present, when the response status
  # code is one that doesn't allow an entity body, or when the body
  # is empty.
  #
  # Note that despite the name, Deflater does not support the +deflate+
  # encoding.
  class Deflater
    # Creates Rack::Deflater middleware. Options:
    #
    # :if :: a lambda enabling / disabling deflation based on returned boolean value
    #        (e.g <tt>use Rack::Deflater, :if => lambda { |*, body| sum=0; body.each { |i| sum += i.length }; sum > 512 }</tt>).
    #        However, be aware that calling `body.each` inside the block will break cases where `body.each` is not idempotent,
    #        such as when it is an +IO+ instance.
    # :include :: a list of content types that should be compressed. By default, all content types are compressed.
    # :sync :: determines if the stream is going to be flushed after every chunk.  Flushing after every chunk reduces
    #          latency for time-sensitive streaming applications, but hurts compression and throughput.
    #          Defaults to +true+.
    def initialize(app, options = {})
      @app = app
      @condition = options[:if]
      @compressible_types = options[:include]
      @sync = options.fetch(:sync, true)
    end

def call(env)
      status, headers, body = response = @app.call(env)

unless should_deflate?(env, status, headers, body)
        return response
      end

request = Request.new(env)

encoding = Utils.select_best_encoding(%w(gzip identity),
                                            request.accept_encoding)

# Set the Vary HTTP header.
      vary = headers["vary"].to_s.split(",").map(&:strip)
      unless vary.include?("*") || vary.any?{|v| v.downcase == 'accept-encoding'}
        headers["vary"] = vary.push("Accept-Encoding").join(",")
      end

case encoding
      when "gzip"
        headers['content-encoding'] = "gzip"
        headers.delete(CONTENT_LENGTH)
        mtime = headers["last-modified"]
        mtime = Time.httpdate(mtime).to_i if mtime
        response[2] = GzipStream.new(body, mtime, @sync)
        response
      when "identity"
        response
      else # when nil
        # Only possible encoding values here are 'gzip', 'identity', and nil
        message = "An acceptable encoding for the requested resource #{request.fullpath} could not be found."
        bp = Rack::BodyProxy.new([message]) { body.close if body.respond_to?(:close) }
        [406, { CONTENT_TYPE => "text/plain", CONTENT_LENGTH => message.length.to_s }, bp]
      end
    end

# Body class used for gzip encoded responses.
    class GzipStream

BUFFER_LENGTH = 128 * 1_024

# Initialize the gzip stream.  Arguments:
      # body :: Response body to compress with gzip
      # mtime :: The modification time of the body, used to set the
      #          modification time in the gzip header.
      # sync :: Whether to flush each gzip chunk as soon as it is ready.
      def initialize(body, mtime, sync)
        @body = body
        @mtime = mtime
        @sync = sync
      end

# Yield gzip compressed strings to the given block.
      def each(&block)
        @writer = block
        gzip = ::Zlib::GzipWriter.new(self)
        gzip.mtime = @mtime if @mtime
        # @body.each is equivalent to @body.gets (slow)
        if @body.is_a? ::File # XXX: Should probably be ::IO
          while part = @body.read(BUFFER_LENGTH)
            gzip.write(part)
            gzip.flush if @sync
          end
        else
          @body.each { |part|
            # Skip empty strings, as they would result in no output,
            # and flushing empty parts would raise Zlib::BufError.
            next if part.empty?
            gzip.write(part)
            gzip.flush if @sync
          }
        end
      ensure
        gzip.finish
      end

# Call the block passed to #each with the gzipped data.
      def write(data)
        @writer.call(data)
      end

# Close the original body if possible.
      def close
        @body.close if @body.respond_to?(:close)
      end
    end

private

# Whether the body should be compressed.
    def should_deflate?(env, status, headers, body)
      # Skip compressing empty entity body responses and responses with
      # no-transform set.
      if Utils::STATUS_WITH_NO_ENTITY_BODY.key?(status.to_i) ||
          /\bno-transform\b/.match?(headers[CACHE_CONTROL].to_s) ||
          headers['content-encoding']&.!~(/\bidentity\b/)
        return false
      end

# Skip if @compressible_types are given and does not include request's content type
      return false if @compressible_types && !(headers.has_key?(CONTENT_TYPE) && @compressible_types.include?(headers[CONTENT_TYPE][/[^;]*/]))

# Skip if @condition lambda is given and evaluates to false
      return false if @condition && !@condition.call(env, status, headers, body)

# No point in compressing empty body, also handles usage with
      # Rack::Sendfile.
      return false if headers[CONTENT_LENGTH] == '0'

true
    end
  end
end

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