module Digest::UUID
Public Class Methods
nil_uuid()
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uuid_from_hash(hash_class, namespace, name)
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Generates a v5 non-random UUID
(Universally Unique IDentifier).
Using OpenSSL::Digest::MD5 generates version 3 UUIDs; OpenSSL::Digest::SHA1 generates version 5 UUIDs. uuid_from_hash
always generates the same UUID
for a given name and namespace combination.
See RFC 4122 for details of UUID
at: www.ietf.org/rfc/rfc4122.txt
# File lib/active_support/core_ext/digest/uuid.rb, line 19 def self.uuid_from_hash(hash_class, namespace, name) if hash_class == Digest::MD5 || hash_class == OpenSSL::Digest::MD5 version = 3 elsif hash_class == Digest::SHA1 || hash_class == OpenSSL::Digest::SHA1 version = 5 else raise ArgumentError, "Expected OpenSSL::Digest::SHA1 or OpenSSL::Digest::MD5, got #{hash_class.name}." end uuid_namespace = pack_uuid_namespace(namespace) hash = hash_class.new hash.update(uuid_namespace) hash.update(name) ary = hash.digest.unpack("NnnnnN") ary[2] = (ary[2] & 0x0FFF) | (version << 12) ary[3] = (ary[3] & 0x3FFF) | 0x8000 "%08x-%04x-%04x-%04x-%04x%08x" % ary end
uuid_v3(uuid_namespace, name)
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Convenience method for uuid_from_hash
using OpenSSL::Digest::MD5.
# File lib/active_support/core_ext/digest/uuid.rb, line 42 def self.uuid_v3(uuid_namespace, name) uuid_from_hash(OpenSSL::Digest::MD5, uuid_namespace, name) end
uuid_v4()
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Convenience method for SecureRandom.uuid.
# File lib/active_support/core_ext/digest/uuid.rb, line 52 def self.uuid_v4 SecureRandom.uuid end
uuid_v5(uuid_namespace, name)
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Convenience method for uuid_from_hash
using OpenSSL::Digest::SHA1.
# File lib/active_support/core_ext/digest/uuid.rb, line 47 def self.uuid_v5(uuid_namespace, name) uuid_from_hash(OpenSSL::Digest::SHA1, uuid_namespace, name) end
Private Class Methods
pack_uuid_namespace(namespace)
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# File lib/active_support/core_ext/digest/uuid.rb, line 62 def self.pack_uuid_namespace(namespace) if [DNS_NAMESPACE, OID_NAMESPACE, URL_NAMESPACE, X500_NAMESPACE].include?(namespace) namespace else match_data = namespace.match(/\A(\h{8})-(\h{4})-(\h{4})-(\h{4})-(\h{4})(\h{8})\z/) raise ArgumentError, "Only UUIDs are valid namespace identifiers" unless match_data.present? match_data.captures.map { |s| s.to_i(16) }.pack("NnnnnN") end end