auth

Paddy 2015-05-15 Parent:73e12d5a1124

168:581c60f8dd23 Go to Latest

auth/scope.go

Switch to a JWT approach. We're going to use a JWT as our access tokens (as discussed in &yet's excellent post https://blog.andyet.com/2015/05/12/micro-services-user-info-and-auth and my ensuing conversation with Fritzy). The benefit of this approach is that we can do authentication and even some authorization without touching the database at all. The drawback is that we can no longer revoke access tokens, only the refresh tokens that grant the access tokens. We need a new config variable to set our private key, used to sign the JWT. We get to remove our token handlers, as we no longer can revoke tokens, so there's no purpose in getting information about it or listing them. Our tokenStore revokeToken gets to be simplified, as it will only ever be used for refresh tokens now. We also updated our postgres and memstore implementations. We added a helper method for generating the signed "access token" (our JWT) and started using it in the places where we're creating a Token. We get to remove the `revoked` SQL column for the tokens table, and rename the `refresh_revoked` column to just be `revoked`. We shortened our access token expiration to 15 minutes instead of an hour, to deal with the token not being revokable.

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1 package auth
2
3 import (
4 "errors"
5 "sort"
6 )
7
8 var (
9 ErrNoScopeStore = errors.New("scopeStore not set in Context")
10 ErrScopeNotFound = errors.New("scope not found")
11 ErrScopeAlreadyExists = errors.New("scope already exists")
12 )
13
14 // Scope represents a limit on the access that a grant provides.
15 type Scope struct {
16 ID string
17 Name string
18 Description string
19 }
20
21 func (s *Scope) ApplyChange(change ScopeChange) {
22 if change.Name != nil {
23 s.Name = *change.Name
24 }
25 if change.Description != nil {
26 s.Description = *change.Description
27 }
28 }
29
30 type Scopes []Scope
31
32 func (s Scopes) Len() int {
33 return len(s)
34 }
35
36 func (s Scopes) Swap(i, j int) {
37 s[i], s[j] = s[j], s[i]
38 }
39
40 func (s Scopes) Less(i, j int) bool {
41 return s[i].ID < s[j].ID
42 }
43
44 func (s Scopes) Strings() []string {
45 res := make([]string, len(s))
46 for pos, scope := range s {
47 res[pos] = scope.ID
48 }
49 return res
50 }
51
52 func stringsToScopes(s []string) Scopes {
53 res := make(Scopes, len(s))
54 for pos, scope := range s {
55 res[pos] = Scope{ID: scope}
56 }
57 return res
58 }
59
60 // ScopeChange represents a change to a Scope.
61 type ScopeChange struct {
62 Name *string
63 Description *string
64 }
65
66 func (s ScopeChange) Empty() bool {
67 return s.Name == nil && s.Description == nil
68 }
69
70 type scopeStore interface {
71 createScopes(scopes []Scope) error
72 getScopes(ids []string) ([]Scope, error)
73 updateScope(id string, change ScopeChange) error
74 removeScopes(ids []string) error
75 listScopes() ([]Scope, error)
76 }
77
78 func (m *memstore) createScopes(scopes []Scope) error {
79 m.scopeLock.Lock()
80 defer m.scopeLock.Unlock()
81
82 for _, scope := range scopes {
83 if _, ok := m.scopes[scope.ID]; ok {
84 return ErrScopeAlreadyExists
85 }
86 }
87 for _, scope := range scopes {
88 m.scopes[scope.ID] = scope
89 }
90 return nil
91 }
92
93 func (m *memstore) getScopes(ids []string) ([]Scope, error) {
94 m.scopeLock.RLock()
95 defer m.scopeLock.RUnlock()
96
97 scopes := []Scope{}
98 for _, id := range ids {
99 scope, ok := m.scopes[id]
100 if !ok {
101 continue
102 }
103 scopes = append(scopes, scope)
104 }
105 sorted := Scopes(scopes)
106 sort.Sort(sorted)
107 scopes = sorted
108 return scopes, nil
109 }
110
111 func (m *memstore) updateScope(id string, change ScopeChange) error {
112 m.scopeLock.Lock()
113 defer m.scopeLock.Unlock()
114
115 scope, ok := m.scopes[id]
116 if !ok {
117 return ErrScopeNotFound
118 }
119 scope.ApplyChange(change)
120 m.scopes[id] = scope
121 return nil
122 }
123
124 func (m *memstore) removeScopes(ids []string) error {
125 m.scopeLock.Lock()
126 defer m.scopeLock.Unlock()
127
128 for _, id := range ids {
129 if _, ok := m.scopes[id]; !ok {
130 return ErrScopeNotFound
131 }
132 }
133 for _, id := range ids {
134 delete(m.scopes, id)
135 }
136 return nil
137 }
138
139 func (m *memstore) listScopes() ([]Scope, error) {
140 m.scopeLock.RLock()
141 defer m.scopeLock.RUnlock()
142
143 scopes := []Scope{}
144 for _, scope := range m.scopes {
145 scopes = append(scopes, scope)
146 }
147 sorted := Scopes(scopes)
148 sort.Sort(sorted)
149 scopes = sorted
150 return scopes, nil
151 }