-
Notifications
You must be signed in to change notification settings - Fork 42
/
userstore.go
125 lines (110 loc) · 3.63 KB
/
userstore.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
package auth
import (
"context"
"crypto/rand"
"math/big"
"net/http"
"sync"
"github.com/go-kivik/kivik/v4/internal"
)
// A UserStore provides an AuthHandler with access to a user store for.
type UserStore interface {
// Validate returns a user context object if the credentials are valid. An
// error must be returned otherwise. A Not-Found error will continue to the
// next user store, while any other error will terminate the auth process.
Validate(ctx context.Context, username, password string) (user *UserContext, err error)
// UserCtx returns a user context object if the user exists. It is used by
// AuthHandlers that don't validate the password (e.g. Cookie auth). If the
// user does not exist, a Not-Found error will be returned.
UserCtx(ctx context.Context, username string) (user *UserContext, err error)
}
// MemoryUserStore is a simple in-memory user store.
type MemoryUserStore struct {
users sync.Map
}
var _ UserStore = (*MemoryUserStore)(nil)
type memoryUser struct {
Salt string
Password string
Roles []string
}
// NewMemoryUserStore returns a new MemoryUserStore.
func NewMemoryUserStore() *MemoryUserStore {
return &MemoryUserStore{}
}
// AddUser adds a user to the store. It returns an error if the user already
// exists.
func (s *MemoryUserStore) AddUser(username, password string, roles []string) error {
salt, err := generateSalt()
if err != nil {
return err
}
_, loaded := s.users.LoadOrStore(username, &memoryUser{
Salt: salt,
Password: password,
Roles: roles,
})
if loaded {
return &internal.Error{Status: http.StatusConflict, Message: "User already exists"}
}
return nil
}
func generateSalt() (string, error) {
const letters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
const n = 16
ret := make([]byte, n)
for i := 0; i < n; i++ {
num, err := rand.Int(rand.Reader, big.NewInt(int64(len(letters))))
if err != nil {
return "", err
}
ret[i] = letters[num.Int64()]
}
return string(ret), nil
}
// DeleteUser deletes a user from the store.
func (s *MemoryUserStore) DeleteUser(username string) {
s.users.Delete(username)
}
var (
errNotFound = &internal.Error{Status: http.StatusNotFound, Message: "User not found"}
errUnauthorized = &internal.Error{Status: http.StatusUnauthorized, Message: "Invalid username or password"}
)
// Validate returns a user context object if the credentials are valid.
func (s *MemoryUserStore) Validate(_ context.Context, username, password string) (*UserContext, error) {
user, ok := s.users.Load(username)
if !ok {
return nil, errNotFound
}
if user.(*memoryUser).Password != password {
return nil, errUnauthorized
}
return &UserContext{
Name: username,
Salt: user.(*memoryUser).Salt,
Roles: user.(*memoryUser).Roles,
}, nil
}
// UserCtx returns a user context object if the user exists.
func (s *MemoryUserStore) UserCtx(_ context.Context, username string) (*UserContext, error) {
user, ok := s.users.Load(username)
if !ok {
return nil, errNotFound
}
return &UserContext{
Name: username,
Salt: user.(*memoryUser).Salt,
Roles: user.(*memoryUser).Roles,
}, nil
}