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opt / alt / ruby33 / share / gems / gems / rack-3.0.8 / lib / rack /

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: etag.rb

# frozen_string_literal: true

require 'digest/sha2'

require_relative 'constants'
require_relative 'utils'

module Rack
  # Automatically sets the etag header on all String bodies.
  #
  # The etag header is skipped if etag or last-modified headers are sent or if
  # a sendfile body (body.responds_to :to_path) is given (since such cases
  # should be handled by apache/nginx).
  #
  # On initialization, you can pass two parameters: a cache-control directive
  # used when etag is absent and a directive when it is present. The first
  # defaults to nil, while the second defaults to "max-age=0, private, must-revalidate"
  class ETag
    ETAG_STRING = Rack::ETAG
    DEFAULT_CACHE_CONTROL = "max-age=0, private, must-revalidate"

def initialize(app, no_cache_control = nil, cache_control = DEFAULT_CACHE_CONTROL)
      @app = app
      @cache_control = cache_control
      @no_cache_control = no_cache_control
    end

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

if etag_status?(status) && body.respond_to?(:to_ary) && !skip_caching?(headers)
        body = body.to_ary
        digest = digest_body(body)
        headers[ETAG_STRING] = %(W/"#{digest}") if digest
      end

unless headers[CACHE_CONTROL]
        if digest
          headers[CACHE_CONTROL] = @cache_control if @cache_control
        else
          headers[CACHE_CONTROL] = @no_cache_control if @no_cache_control
        end
      end

response
    end

private

def etag_status?(status)
        status == 200 || status == 201
      end

def skip_caching?(headers)
        headers.key?(ETAG_STRING) || headers.key?('last-modified')
      end

def digest_body(body)
        digest = nil

body.each do |part|
          (digest ||= Digest::SHA256.new) << part unless part.empty?
        end

digest && digest.hexdigest.byteslice(0,32)
      end
  end
end

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