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require 'chef/exceptions'
class Chef
class Whitelist
# filter takes two arguments - the data you want to filter, and a whitelisted array
# of keys you want included. You can capture a subtree of the data to filter by
# providing a "/"-delimited string of keys. If some key includes "/"-characters,
# you must provide an array of keys instead.
#
# Whitelist.filter(
# { "filesystem" => {
# "/dev/disk" => {
# "size" => "10mb"
# },
# "map - autohome" => {
# "size" => "10mb"
# }
# },
# "network" => {
# "interfaces" => {
# "eth0" => {...},
# "eth1" => {...}
# }
# }
# },
# ["network/interfaces/eth0", ["filesystem", "/dev/disk"]])
# will capture the eth0 and /dev/disk subtrees.
def self.filter(data, whitelist=nil)
return data if whitelist.nil?
new_data = {}
whitelist.each do |item|
add_data(data, new_data, item)
end
new_data
end
# Walk the data has according to the keys provided by the whitelisted item
# and add the data to the whitelisting result.
def self.add_data(data, new_data, item)
parts = to_array(item)
all_data = data
filtered_data = new_data
parts[0..-2].each do |part|
unless all_data[part]
Chef::Log.warn("Could not find whitelist attribute #{item}.")
return nil
end
filtered_data[part] ||= {}
filtered_data = filtered_data[part]
all_data = all_data[part]
end
# Note: You can't do all_data[parts[-1]] here because the value
# may be false-y
unless all_data.key?(parts[-1])
Chef::Log.warn("Could not find whitelist attribute #{item}.")
return nil
end
filtered_data[parts[-1]] = all_data[parts[-1]]
new_data
end
private_class_method :add_data
# Accepts a String or an Array, and returns an Array of String keys that
# are used to traverse the data hash. Strings are split on "/", Arrays are
# assumed to contain exact keys (that is, Array elements will not be split
# by "/").
def self.to_array(item)
return item if item.kind_of? Array
parts = item.split("/")
parts.shift if !parts.empty? && parts[0].empty?
parts
end
private_class_method :to_array
end
end
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