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require 'active_support/core_ext/hash/keys'
require 'active_support/core_ext/object/duplicable'
require 'action_dispatch/http/parameter_filter'
module ActionDispatch
module Http
# Allows you to specify sensitive parameters which will be replaced from
# the request log by looking in the query string of the request and all
# subhashes of the params hash to filter. If a block is given, each key and
# value of the params hash and all subhashes is passed to it, the value
# or key can be replaced using String#replace or similar method.
#
# 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
ENV_MATCH = [/RAW_POST_DATA/, "rack.request.form_vars"] # :nodoc:
NULL_PARAM_FILTER = ParameterFilter.new # :nodoc:
NULL_ENV_FILTER = ParameterFilter.new ENV_MATCH # :nodoc:
def initialize(env)
super
@filtered_parameters = nil
@filtered_env = nil
@filtered_path = nil
end
# Return a hash of parameters with all sensitive data replaced.
def filtered_parameters
@filtered_parameters ||= parameter_filter.filter(parameters)
end
# Return a hash of request.env with all sensitive data replaced.
def filtered_env
@filtered_env ||= env_filter.filter(@env)
end
# Reconstructed a path with all sensitive GET parameters replaced.
def filtered_path
@filtered_path ||= query_string.empty? ? path : "#{path}?#{filtered_query_string}"
end
protected
def parameter_filter
parameter_filter_for @env.fetch("action_dispatch.parameter_filter") {
return NULL_PARAM_FILTER
}
end
def env_filter
user_key = @env.fetch("action_dispatch.parameter_filter") {
return NULL_ENV_FILTER
}
parameter_filter_for(Array(user_key) + ENV_MATCH)
end
def parameter_filter_for(filters)
ParameterFilter.new(filters)
end
KV_RE = '[^&;=]+'
PAIR_RE = %r{(#{KV_RE})=(#{KV_RE})}
def filtered_query_string
query_string.gsub(PAIR_RE) do |_|
parameter_filter.filter([[$1, $2]]).first.join("=")
end
end
end
end
end
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