ducky/devices

Paddy 2015-11-15 Parent:b6494e1a499e

8:34130c700842 Go to Latest

ducky/devices/vendor/code.google.com/p/go-uuid/uuid/hash.go

Implement ListDevicesByOwner. Write a unit test for listing Devices by their Owner property, as per our Storer interface. Basically, if we insert Devices into the datastore, we need to be able to retrieve the Devices that someone owns. Simple enough. This meant that I needed to implement the Memstore version, past the barebones stub, so the tests would continue to pass.

History
paddy@0 1 // Copyright 2011 Google Inc. All rights reserved.
paddy@0 2 // Use of this source code is governed by a BSD-style
paddy@0 3 // license that can be found in the LICENSE file.
paddy@0 4
paddy@0 5 package uuid
paddy@0 6
paddy@0 7 import (
paddy@0 8 "crypto/md5"
paddy@0 9 "crypto/sha1"
paddy@0 10 "hash"
paddy@0 11 )
paddy@0 12
paddy@0 13 // Well known Name Space IDs and UUIDs
paddy@0 14 var (
paddy@0 15 NameSpace_DNS = Parse("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
paddy@0 16 NameSpace_URL = Parse("6ba7b811-9dad-11d1-80b4-00c04fd430c8")
paddy@0 17 NameSpace_OID = Parse("6ba7b812-9dad-11d1-80b4-00c04fd430c8")
paddy@0 18 NameSpace_X500 = Parse("6ba7b814-9dad-11d1-80b4-00c04fd430c8")
paddy@0 19 NIL = Parse("00000000-0000-0000-0000-000000000000")
paddy@0 20 )
paddy@0 21
paddy@0 22 // NewHash returns a new UUID dervied from the hash of space concatenated with
paddy@0 23 // data generated by h. The hash should be at least 16 byte in length. The
paddy@0 24 // first 16 bytes of the hash are used to form the UUID. The version of the
paddy@0 25 // UUID will be the lower 4 bits of version. NewHash is used to implement
paddy@0 26 // NewMD5 and NewSHA1.
paddy@0 27 func NewHash(h hash.Hash, space UUID, data []byte, version int) UUID {
paddy@0 28 h.Reset()
paddy@0 29 h.Write(space)
paddy@0 30 h.Write([]byte(data))
paddy@0 31 s := h.Sum(nil)
paddy@0 32 uuid := make([]byte, 16)
paddy@0 33 copy(uuid, s)
paddy@0 34 uuid[6] = (uuid[6] & 0x0f) | uint8((version&0xf)<<4)
paddy@0 35 uuid[8] = (uuid[8] & 0x3f) | 0x80 // RFC 4122 variant
paddy@0 36 return uuid
paddy@0 37 }
paddy@0 38
paddy@0 39 // NewMD5 returns a new MD5 (Version 3) UUID based on the
paddy@0 40 // supplied name space and data.
paddy@0 41 //
paddy@0 42 // NewHash(md5.New(), space, data, 3)
paddy@0 43 func NewMD5(space UUID, data []byte) UUID {
paddy@0 44 return NewHash(md5.New(), space, data, 3)
paddy@0 45 }
paddy@0 46
paddy@0 47 // NewSHA1 returns a new SHA1 (Version 5) UUID based on the
paddy@0 48 // supplied name space and data.
paddy@0 49 //
paddy@0 50 // NewHash(sha1.New(), space, data, 5)
paddy@0 51 func NewSHA1(space UUID, data []byte) UUID {
paddy@0 52 return NewHash(sha1.New(), space, data, 5)
paddy@0 53 }