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class UUIDResolver
# Note the static '4' in the third group: that's the UUID version.
UUID_V4_REGEX = %r[\A[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[0-9a-f]{4}-[0-9a-f]{12}\z]
attr_reader :records, :count, :record, :uuid
def initialize(uuid)
@uuid = validate!(uuid)
@records, @count = resolve!
end
def record
case @count
when 0
nil
else
records.first
end
end
private
# List models that have UUIDs
def public_record_types
[
::Agent,
::Map,
::Resource,
::Taxonomy
].freeze
end
# Find records with this UUID
def resolve!
records = []
public_record_types.each do |model|
records << model.find_by(uuid: @uuid)
end
[records.compact, records.compact.size]
end
# Ensure the passed UUID is correct
def validate!(uuid)
validate_uuid_v4(uuid) || raise(ArgumentError.new("You must pass a valid random UUID (https://tools.ietf.org/html/rfc4122)"))
end
# Validate a UUID version 4 (random)
def validate_uuid_v4(uuid)
uuid = uuid.to_s.downcase
uuid.match?(UUID_V4_REGEX) ? uuid : false
end
end
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