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# frozen_string_literal: true
module SecureHeaders
class XXssProtectionConfigError < StandardError; end
class XXssProtection
HEADER_NAME = "x-xss-protection".freeze
DEFAULT_VALUE = "0".freeze
VALID_X_XSS_HEADER = /\A[01](; mode=block)?(; report=.*)?\z/
# Public: generate an X-Xss-Protection header.
#
# Returns a default header if no configuration is provided, or a
# header name and value based on the config.
def self.make_header(config = nil, user_agent = nil)
return if config == OPT_OUT
[HEADER_NAME, config || DEFAULT_VALUE]
end
def self.validate_config!(config)
return if config.nil? || config == OPT_OUT
raise TypeError.new("Must be a string. Found #{config.class}: #{config}") unless config.is_a?(String)
raise XXssProtectionConfigError.new("Invalid format (see VALID_X_XSS_HEADER)") unless config.to_s =~ VALID_X_XSS_HEADER
end
end
end
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