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📁 auth
📄 body_proxy.rb(1.27 KB)
📄 builder.rb(8.21 KB)
📄 cascade.rb(2.22 KB)
📄 chunked.rb(3.19 KB)
📄 common_logger.rb(2.96 KB)
📄 conditional_get.rb(2.99 KB)
📄 config.rb(410 B)
📄 content_length.rb(919 B)
📄 content_type.rb(684 B)
📁 core_ext
📄 deflater.rb(5.15 KB)
📄 directory.rb(5.9 KB)
📄 etag.rb(2.14 KB)
📄 events.rb(4.72 KB)
📄 file.rb(88 B)
📄 files.rb(5.74 KB)
📁 handler
📄 handler.rb(2.87 KB)
📄 head.rb(520 B)
📄 lint.rb(30.92 KB)
📄 lobster.rb(1.96 KB)
📄 lock.rb(716 B)
📄 logger.rb(384 B)
📄 media_type.rb(1.4 KB)
📄 method_override.rb(1.29 KB)
📄 mime.rb(32.39 KB)
📄 mock.rb(8.29 KB)
📁 multipart
📄 multipart.rb(2.56 KB)
📄 null_logger.rb(980 B)
📄 query_parser.rb(6.85 KB)
📄 recursive.rb(1.75 KB)
📄 reloader.rb(3.12 KB)
📄 request.rb(19.69 KB)
📄 response.rb(8.78 KB)
📄 rewindable_input.rb(2.85 KB)
📄 runtime.rb(885 B)
📄 sendfile.rb(5.45 KB)
📄 server.rb(13.29 KB)
📁 session
📄 show_exceptions.rb(13.3 KB)
📄 show_status.rb(3.42 KB)
📄 static.rb(6.07 KB)
📄 tempfile_reaper.rb(661 B)
📄 urlmap.rb(2.77 KB)
📄 utils.rb(17.91 KB)
📄 version.rb(785 B)

Editing: etag.rb

# frozen_string_literal: true

require_relative '../rack'
require 'digest/sha2'

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 = @app.call(env)

headers = Utils::HeaderHash[headers]

if etag_status?(status) && etag_body?(body) && !skip_caching?(headers)
        original_body = body
        digest, new_body = digest_body(body)
        body = Rack::BodyProxy.new(new_body) do
          original_body.close if original_body.respond_to?(:close)
        end
        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

[status, headers, body]
    end

private

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

def etag_body?(body)
        !body.respond_to?(:to_path)
      end

def skip_caching?(headers)
        headers.key?(ETAG_STRING) || headers.key?('Last-Modified')
      end

def digest_body(body)
        parts = []
        digest = nil

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

[digest && digest.hexdigest.byteslice(0, 32), parts]
      end
  end
end

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