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# frozen_string_literal: true
module Dalli
module Protocol
class Meta
##
# The meta protocol requires that keys be ASCII only, so Unicode keys are
# not supported. In addition, the use of whitespace in the key is not
# allowed.
# memcached supports the use of base64 hashes for keys containing
# whitespace or non-ASCII characters, provided the 'b' flag is included in the request.
class KeyRegularizer
WHITESPACE = /\s/.freeze
def self.encode(key)
return [key, false] if key.ascii_only? && !WHITESPACE.match(key)
strict_base64_encoded = [key].pack('m0')
[strict_base64_encoded, true]
end
def self.decode(encoded_key, base64_encoded)
return encoded_key unless base64_encoded
strict_base64_decoded = encoded_key.unpack1('m0')
strict_base64_decoded.force_encoding(Encoding::UTF_8)
end
end
end
end
end
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