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require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/hash/keys'
require 'active_support/core_ext/object/duplicable'
module ActionDispatch
module Http
# Allows you to specify sensitive parameters which will be replaced from
# the request log by looking 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:
#
# env["action_dispatch.parameter_filter"] = [:password]
# => replaces the value to all keys matching /password/i with "[FILTERED]"
#
# env["action_dispatch.parameter_filter"] = [:foo, "bar"]
# => replaces the value to all keys matching /foo|bar/i with "[FILTERED]"
#
# env["action_dispatch.parameter_filter"] = lambda do |k,v|
# v.reverse! if k =~ /secret/i
# end
# => reverses the value to all keys matching /secret/i
#
module FilterParameters
extend ActiveSupport::Concern
@@compiled_parameter_filter_for = {}
# Return a hash of parameters with all sensitive data replaced.
def filtered_parameters
@filtered_parameters ||= if filtering_parameters?
process_parameter_filter(parameters)
else
parameters.dup
end
end
alias :fitered_params :filtered_parameters
# Return a hash of request.env with all sensitive data replaced.
def filtered_env
filtered_env = @env.dup
filtered_env.each do |key, value|
if (key =~ /RAW_POST_DATA/i)
filtered_env[key] = '[FILTERED]'
elsif value.is_a?(Hash)
filtered_env[key] = process_parameter_filter(value)
end
end
filtered_env
end
protected
def filtering_parameters? #:nodoc:
@env["action_dispatch.parameter_filter"].present?
end
def process_parameter_filter(params) #:nodoc:
compiled_parameter_filter_for(@env["action_dispatch.parameter_filter"]).call(params)
end
def compile_parameter_filter(filters) #:nodoc:
strings, regexps, blocks = [], [], []
filters.each do |item|
case item
when NilClass
when Proc
blocks << item
when Regexp
regexps << item
else
strings << item.to_s
end
end
regexps << Regexp.new(strings.join('|'), true) unless strings.empty?
[regexps, blocks]
end
def compiled_parameter_filter_for(filters) #:nodoc:
@@compiled_parameter_filter_for[filters] ||= begin
regexps, blocks = compile_parameter_filter(filters)
lambda do |original_params|
filtered_params = {}
original_params.each do |key, value|
if regexps.find { |r| key =~ r }
value = '[FILTERED]'
elsif value.is_a?(Hash)
value = process_parameter_filter(value)
elsif value.is_a?(Array)
value = value.map { |v| v.is_a?(Hash) ? process_parameter_filter(v) : v }
elsif blocks.present?
key = key.dup
value = value.dup if value.duplicable?
blocks.each { |b| b.call(key, value) }
end
filtered_params[key] = value
end
filtered_params
end
end
end
end
end
end
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