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module ActionController
module FilterParameterLogging
extend ActiveSupport::Concern
INTERNAL_PARAMS = %w(controller action format _method only_path)
module ClassMethods
# Replace sensitive parameter data from the request log.
# Filters parameters that have any of the arguments as a substring.
# Looks in all subhashes of the param hash for keys to filter.
# If a block is given, each key and value of the parameter hash and all
# subhashes is passed to it, the value or key
# can be replaced using String#replace or similar method.
#
# Examples:
#
# filter_parameter_logging :password
# => replaces the value to all keys matching /password/i with "[FILTERED]"
#
# filter_parameter_logging :foo, "bar"
# => replaces the value to all keys matching /foo|bar/i with "[FILTERED]"
#
# filter_parameter_logging { |k,v| v.reverse! if k =~ /secret/i }
# => reverses the value to all keys matching /secret/i
#
# filter_parameter_logging(:foo, "bar") { |k,v| v.reverse! if k =~ /secret/i }
# => reverses the value to all keys matching /secret/i, and
# replaces the value to all keys matching /foo|bar/i with "[FILTERED]"
def filter_parameter_logging(*filter_words, &block)
raise "You must filter at least one word from logging" if filter_words.empty?
parameter_filter = Regexp.new(filter_words.join('|'), true)
define_method(:filter_parameters) do |original_params|
filtered_params = {}
original_params.each do |key, value|
if key =~ parameter_filter
value = '[FILTERED]'
elsif value.is_a?(Hash)
value = filter_parameters(value)
elsif value.is_a?(Array)
value = value.map { |item| filter_parameters(item) }
elsif block_given?
key = key.dup
value = value.dup if value.duplicable?
yield key, value
end
filtered_params[key] = value
end
filtered_params.except!(*INTERNAL_PARAMS)
end
protected :filter_parameters
end
end
protected
def filter_parameters(params)
params.dup.except!(*INTERNAL_PARAMS)
end
end
end
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