ducky/devices

Paddy 2016-01-02 Parent:a700ede02f91

20:ed1b5ba69551 Go to Latest

ducky/devices/vendor/github.com/pborman/uuid/hash.go

Add updating devices to apiv1. We needed a way to be able to update devices after they were created. This is supported in the devices package, we just needed to expose it using apiv1 endpoints. In doing so, it became apparent that allowing users to change the Owner of their Devices wasn't properly thought through, and pending a reason to use it, I'm just removing it. The biggest issue came when trying to return usable error messages; we couldn't distinguish between "you don't own the device you're trying to update" and "you're not allowed to change the owner of the device". I also couldn't figure out _who should be able to_ change the owner of the device, which is generally an indication that I'm building a feature before I have a use case for it. To support this change, the apiv1.DeviceChange type needed its Owner property removed. I also needed to add deviceFromAPI and devicesFromAPI helpers to return devices.Device types from apiv1.Device types. There's now a new validateDeviceUpdate helper that checks to ensure that a device update request is valid and the user has the appropriate permissions. The createRequest type now accepts a slice of Devices, not a slice of DeviceChanges, because we want to pass the Owner in. A new updateRequest type is created, which accepts a DeviceChange to apply. A new handleUpdateDevice handler is created, which is assigned to the endpoint for PATCH requests against a device ID. It checks that the user is logged in, the Device they're trying to update exists, and that it's a valid update. If all of that is true, the device is updated and the updated device is returned. Finally, we had to add two new scopes to support new functionality: ScopeUpdateOtherUserDevices allows a user to update other user's devices, and ScopeUpdateLastSeen allows a user to update the LastSeen property of a device. Pending some better error messages, this should be a full implementation of updating a device, which leaves only the deletion endpoint to deal with.

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