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PATH: opt / alt / ruby24 / lib64 / ruby / gems / 2.4.0 / gems / rack-1.6.4 / lib / rack

require 'digest/md5'

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 = 'ETag'.freeze
    DEFAULT_CACHE_CONTROL = "max-age=0, private, must-revalidate".freeze

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)

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[CACHE_CONTROL] && headers[CACHE_CONTROL].include?('no-cache')) ||
          headers.key?(ETAG_STRING) || headers.key?('Last-Modified')
      end

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

body.each do |part|
          parts << part
          (digest ||= Digest::MD5.new) << part unless part.empty?
        end

[digest && digest.hexdigest, parts]
      end
  end
end

[+] auth
[-] rewindable_input.rb [edit]
[-] deflater.rb [edit]
[-] lobster.rb [edit]
[-] tempfile_reaper.rb [edit]
[-] directory.rb [edit]
[-] utils.rb [edit]
[+] multipart
[-] builder.rb [edit]
[-] response.rb [edit]
[-] request.rb [edit]
[-] server.rb [edit]
[-] methodoverride.rb [edit]
[+] handler
[-] head.rb [edit]
[-] logger.rb [edit]
[-] static.rb [edit]
[+] backports
[-] mock.rb [edit]
[-] chunked.rb [edit]
[-] runtime.rb [edit]
[-] nulllogger.rb [edit]
[-] urlmap.rb [edit]
[-] showexceptions.rb [edit]
[+] ..
[-] mime.rb [edit]
[-] config.rb [edit]
[-] lint.rb [edit]
[-] commonlogger.rb [edit]
[-] content_type.rb [edit]
[-] reloader.rb [edit]
[+] utils
[-] recursive.rb [edit]
[-] multipart.rb [edit]
[-] body_proxy.rb [edit]
[-] sendfile.rb [edit]
[-] etag.rb [edit]
[-] cascade.rb [edit]
[-] file.rb [edit]
[-] conditionalget.rb [edit]
[-] lock.rb [edit]
[-] handler.rb [edit]
[-] showstatus.rb [edit]
[+] session
[-] content_length.rb [edit]