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PATH: opt / alt / ruby30 / share / gems / gems / rack-3.0.8 / lib / rack

# 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

[+] auth
[-] common_logger.rb [edit]
[-] rewindable_input.rb [edit]
[-] deflater.rb [edit]
[-] tempfile_reaper.rb [edit]
[-] directory.rb [edit]
[-] utils.rb [edit]
[+] multipart
[-] builder.rb [edit]
[-] response.rb [edit]
[-] conditional_get.rb [edit]
[-] version.rb [edit]
[-] request.rb [edit]
[-] show_status.rb [edit]
[-] mock_request.rb [edit]
[-] method_override.rb [edit]
[-] head.rb [edit]
[-] logger.rb [edit]
[-] static.rb [edit]
[-] mock.rb [edit]
[-] chunked.rb [edit]
[-] runtime.rb [edit]
[-] urlmap.rb [edit]
[-] null_logger.rb [edit]
[-] files.rb [edit]
[-] query_parser.rb [edit]
[-] mock_response.rb [edit]
[+] ..
[-] show_exceptions.rb [edit]
[-] mime.rb [edit]
[-] config.rb [edit]
[-] constants.rb [edit]
[-] events.rb [edit]
[-] lint.rb [edit]
[-] content_type.rb [edit]
[-] reloader.rb [edit]
[-] recursive.rb [edit]
[-] multipart.rb [edit]
[-] body_proxy.rb [edit]
[-] sendfile.rb [edit]
[-] etag.rb [edit]
[-] headers.rb [edit]
[-] cascade.rb [edit]
[-] file.rb [edit]
[-] lock.rb [edit]
[-] media_type.rb [edit]
[-] content_length.rb [edit]