Module: Digest::UUID
Relationships & Source Files | |
Defined in: | activesupport/lib/active_support/core_ext/digest/uuid.rb |
Class Method Summary
-
.uuid_from_hash(hash_class, namespace, name)
Generates a v5 non-random
UUID
(Universally Unique IDentifier). -
.uuid_v3(uuid_namespace, name)
Convenience method for uuid_from_hash using
OpenSSL::Digest::MD5
. -
.uuid_v4
Convenience method for
SecureRandom.uuid
. -
.uuid_v5(uuid_namespace, name)
Convenience method for uuid_from_hash using
OpenSSL::Digest::SHA1
.
Class Method Details
.uuid_from_hash(hash_class, namespace, name)
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 'activesupport/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)
Convenience method for uuid_from_hash using OpenSSL::Digest::MD5
.
# File 'activesupport/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
Convenience method for SecureRandom.uuid
.
# File 'activesupport/lib/active_support/core_ext/digest/uuid.rb', line 52
def self.uuid_v4 SecureRandom.uuid end
.uuid_v5(uuid_namespace, name)
Convenience method for uuid_from_hash using OpenSSL::Digest::SHA1
.
# File 'activesupport/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