ducky/devices

Paddy 2015-12-19 Parent:vendor/code.google.com/p/go-uuid/uuid/uuid.go@b6494e1a499e

16:a700ede02f91 Go to Latest

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

Validate device creation. Update our uuid package to the latest, which is now based on the GitHub fork instead of the Google Code. Also, update our api package to its latest version, which now needs the pqarrays package as a dependency. We fleshed out the validateDeviceCreation. We now pass in the scopes we have (for broad access control) and the user ID (for fine-grained access control). This helper returns the first error it encounters, though it should probably return a slice so we can return multiple errors all at once. Before we even decode the request to create a Device, let's check if the user is even logged in. If we can't ascertain that or they're not, there's no point in even consuming the memory necessary to read the request, because we know we're not going to use it anyways. Finally actually validate the devices we're creating, and return an appropriate error for each error we can get. Also, the api.CheckScopes helper function now takes the scopes passed in as a string slice, and we have an api.GetScopes helper function to retrieve the scopes associated with the request. Let's not keep parsing that. We need two new scopes to control access for device creation; ScopeImport lets users import devices in and is pretty much admin access. ScopeCreateOtherUserDevices allows a user to create Devices that are owned by another user.

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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 "bytes"
9 "crypto/rand"
10 "fmt"
11 "io"
12 "strings"
13 )
14
15 // A UUID is a 128 bit (16 byte) Universal Unique IDentifier as defined in RFC
16 // 4122.
17 type UUID []byte
18
19 // A Version represents a UUIDs version.
20 type Version byte
21
22 // A Variant represents a UUIDs variant.
23 type Variant byte
24
25 // Constants returned by Variant.
26 const (
27 Invalid = Variant(iota) // Invalid UUID
28 RFC4122 // The variant specified in RFC4122
29 Reserved // Reserved, NCS backward compatibility.
30 Microsoft // Reserved, Microsoft Corporation backward compatibility.
31 Future // Reserved for future definition.
32 )
33
34 var rander = rand.Reader // random function
35
36 // New returns a new random (version 4) UUID as a string. It is a convenience
37 // function for NewRandom().String().
38 func New() string {
39 return NewRandom().String()
40 }
41
42 // Parse decodes s into a UUID or returns nil. Both the UUID form of
43 // xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx and
44 // urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx are decoded.
45 func Parse(s string) UUID {
46 if len(s) == 36+9 {
47 if strings.ToLower(s[:9]) != "urn:uuid:" {
48 return nil
49 }
50 s = s[9:]
51 } else if len(s) != 36 {
52 return nil
53 }
54 if s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-' {
55 return nil
56 }
57 uuid := make([]byte, 16)
58 for i, x := range []int{
59 0, 2, 4, 6,
60 9, 11,
61 14, 16,
62 19, 21,
63 24, 26, 28, 30, 32, 34} {
64 if v, ok := xtob(s[x:]); !ok {
65 return nil
66 } else {
67 uuid[i] = v
68 }
69 }
70 return uuid
71 }
72
73 // Equal returns true if uuid1 and uuid2 are equal.
74 func Equal(uuid1, uuid2 UUID) bool {
75 return bytes.Equal(uuid1, uuid2)
76 }
77
78 // String returns the string form of uuid, xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
79 // , or "" if uuid is invalid.
80 func (uuid UUID) String() string {
81 if uuid == nil || len(uuid) != 16 {
82 return ""
83 }
84 b := []byte(uuid)
85 return fmt.Sprintf("%08x-%04x-%04x-%04x-%012x",
86 b[:4], b[4:6], b[6:8], b[8:10], b[10:])
87 }
88
89 // URN returns the RFC 2141 URN form of uuid,
90 // urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, or "" if uuid is invalid.
91 func (uuid UUID) URN() string {
92 if uuid == nil || len(uuid) != 16 {
93 return ""
94 }
95 b := []byte(uuid)
96 return fmt.Sprintf("urn:uuid:%08x-%04x-%04x-%04x-%012x",
97 b[:4], b[4:6], b[6:8], b[8:10], b[10:])
98 }
99
100 // Variant returns the variant encoded in uuid. It returns Invalid if
101 // uuid is invalid.
102 func (uuid UUID) Variant() Variant {
103 if len(uuid) != 16 {
104 return Invalid
105 }
106 switch {
107 case (uuid[8] & 0xc0) == 0x80:
108 return RFC4122
109 case (uuid[8] & 0xe0) == 0xc0:
110 return Microsoft
111 case (uuid[8] & 0xe0) == 0xe0:
112 return Future
113 default:
114 return Reserved
115 }
116 panic("unreachable")
117 }
118
119 // Version returns the verison of uuid. It returns false if uuid is not
120 // valid.
121 func (uuid UUID) Version() (Version, bool) {
122 if len(uuid) != 16 {
123 return 0, false
124 }
125 return Version(uuid[6] >> 4), true
126 }
127
128 func (v Version) String() string {
129 if v > 15 {
130 return fmt.Sprintf("BAD_VERSION_%d", v)
131 }
132 return fmt.Sprintf("VERSION_%d", v)
133 }
134
135 func (v Variant) String() string {
136 switch v {
137 case RFC4122:
138 return "RFC4122"
139 case Reserved:
140 return "Reserved"
141 case Microsoft:
142 return "Microsoft"
143 case Future:
144 return "Future"
145 case Invalid:
146 return "Invalid"
147 }
148 return fmt.Sprintf("BadVariant%d", int(v))
149 }
150
151 // SetRand sets the random number generator to r, which implents io.Reader.
152 // If r.Read returns an error when the package requests random data then
153 // a panic will be issued.
154 //
155 // Calling SetRand with nil sets the random number generator to the default
156 // generator.
157 func SetRand(r io.Reader) {
158 if r == nil {
159 rander = rand.Reader
160 return
161 }
162 rander = r
163 }