-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
session.go
156 lines (131 loc) · 3.61 KB
/
session.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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
package auth
import (
"bufio"
"bytes"
"context"
"errors"
"fmt"
"net"
"net/http"
"time"
"github.com/alexedwards/scs/v2"
"github.com/jatolentino/tutorialspoint/api/web"
"github.com/jatolentino/tutorialspoint/api/weberr"
"github.com/jatolentino/tutorialspoint/core/claims"
)
const userKey = "userID"
const roleKey = "role"
// SaveUserSession saves the passed user in the current session.
func SaveUserSession(ctx context.Context, session *scs.SessionManager, userID string, role string) error {
session.Put(ctx, userKey, userID)
session.Put(ctx, roleKey, role)
if err := session.RenewToken(ctx); err != nil {
return fmt.Errorf("renewing token: %w", err)
}
return nil
}
// Authenticate returns a middleware intended to protect
// routes which require an authenticated user.
func Authenticate(s *scs.SessionManager) web.Middleware {
m := func(handler web.Handler) web.Handler {
h := func(ctx context.Context, w http.ResponseWriter, r *http.Request) error {
uid, ok := s.Get(ctx, userKey).(string)
if !ok {
return weberr.NotAuthorized(errors.New("no userID in session"))
}
role, ok := s.Get(ctx, roleKey).(string)
if !ok {
return weberr.NotAuthorized(errors.New("no user role in session"))
}
ctx = claims.Set(ctx, claims.Claims{UserID: uid, Role: role})
return handler(ctx, w, r)
}
return h
}
return m
}
// Authenticate returns a middleware intended to protect
// routes which require an administrator.
func Admin(s *scs.SessionManager) web.Middleware {
m := func(handler web.Handler) web.Handler {
h := func(ctx context.Context, w http.ResponseWriter, r *http.Request) error {
role, ok := s.Get(ctx, roleKey).(string)
if !ok {
return weberr.NotAuthorized(errors.New("no user role in session"))
}
if role != claims.RoleAdmin {
return weberr.NotAuthorized(fmt.Errorf("user role is not admin: %s", role))
}
return handler(ctx, w, r)
}
return h
}
return m
}
// LoadAndSave updates the user's session if there was
// a change.
func LoadAndSave(s *scs.SessionManager) web.Middleware {
m := func(handler web.Handler) web.Handler {
h := func(ctx context.Context, w http.ResponseWriter, r *http.Request) error {
var token string
cookie, err := r.Cookie(s.Cookie.Name)
if err == nil {
token = cookie.Value
}
ctx, err = s.Load(ctx, token)
if err != nil {
return err
}
bw := &bufferedResponseWriter{ResponseWriter: w}
if err := handler(ctx, bw, r); err != nil {
return err
}
if r.MultipartForm != nil {
r.MultipartForm.RemoveAll()
}
switch s.Status(ctx) {
case scs.Modified:
token, expiry, err := s.Commit(ctx)
if err != nil {
return err
}
s.WriteSessionCookie(ctx, w, token, expiry)
case scs.Destroyed:
s.WriteSessionCookie(ctx, w, "", time.Time{})
}
w.Header().Add("Vary", "Cookie")
if bw.code != 0 {
w.WriteHeader(bw.code)
}
w.Write(bw.buf.Bytes())
return nil
}
return h
}
return m
}
type bufferedResponseWriter struct {
http.ResponseWriter
buf bytes.Buffer
code int
wroteHeader bool
}
func (bw *bufferedResponseWriter) Write(b []byte) (int, error) {
return bw.buf.Write(b)
}
func (bw *bufferedResponseWriter) WriteHeader(code int) {
if !bw.wroteHeader {
bw.code = code
bw.wroteHeader = true
}
}
func (bw *bufferedResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
hj := bw.ResponseWriter.(http.Hijacker)
return hj.Hijack()
}
func (bw *bufferedResponseWriter) Push(target string, opts *http.PushOptions) error {
if pusher, ok := bw.ResponseWriter.(http.Pusher); ok {
return pusher.Push(target, opts)
}
return http.ErrNotSupported
}