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Contents
# frozen_string_literal: true
require "digest"
module Decidim
# This class will generate a unique fingerprint given an arbitrarily deep hash,
# ensuring that the same fingerprint will be generated regardless of ordering and
# whether keys are symbols or strings.
#
class FingerprintCalculator
# Public: Initializes the class with a source data to be fingerprinted.
def initialize(data)
@data = data
end
# Public: Generates a fingerprint hash.
#
# Returns a String with the fingerprint.
def value
@value ||= Digest::SHA256.hexdigest(source)
end
# Public: Returns the fingerprint source *before* hashing, so that it can be
# inspected by the user.
#
# Returns a String with the JSON representation of the normalized data.
def source
@source ||= JSON.generate(sort_hash(@data))
end
private
def sort_hash(hash)
return hash unless hash.is_a?(Hash)
hash.map { |key, value| [key, sort_hash(value)] }
.sort_by { |key, _value| key }.to_h
end
end
end
Version data entries
25 entries across 25 versions & 1 rubygems