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
|
package pages
import (
"context"
"database/sql"
"errors"
"gosten/csrf"
"gosten/form"
"gosten/session"
"log"
"net/http"
"net/url"
"github.com/go-chi/chi/v5"
"golang.org/x/crypto/bcrypt"
)
type userContextKey struct{}
func userId(r *http.Request) int32 {
return r.Context().Value(userContextKey{}).(int32)
}
const (
sessionDuration = 86400 * 7 // 7 days
loginQueryMarker = "next"
)
func RequireAuth(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
s := session.From(r)
if !s.IsNew() && s.Authenticated {
u, err := Q.GetUserById(r.Context(), s.UserID)
if err == nil {
// authenticated --> done
ctx := context.WithValue(r.Context(), userContextKey{}, u.ID)
next.ServeHTTP(w, r.WithContext(ctx))
return
}
s.Invalidate()
s.Save(w, r)
}
// redirect to login with next-param
v := url.Values{}
v.Set(loginQueryMarker, r.URL.Path)
redirPath := "/login?" + v.Encode()
http.Redirect(w, r, redirPath, http.StatusFound)
})
}
type user struct {
Name string `form:"options=required,autofocus"`
Password string `form:"type=password;options=required"`
RememberMe bool `form:"type=checkbox;value=y;options=checked"`
Errors []error `form:"-"`
csrf.Csrf
}
func Login() Page {
r := chi.NewRouter()
r.Get("/", func(w http.ResponseWriter, r *http.Request) {
if session.From(r).Authenticated {
http.Redirect(w, r, "/", http.StatusFound)
}
u := user{}
u.SetCsrfField(r)
showLoginPage(w, u)
})
r.Post("/", handleLogin)
return r
}
func checkLogin(ctx context.Context, user user) (bool, int32) {
dbUser, err := Q.GetUserByName(ctx, user.Name)
if err == nil {
hash := []byte(dbUser.Pwd)
pwd := []byte(user.Password)
if bcrypt.CompareHashAndPassword(hash, pwd) != nil {
return false, 0
}
} else if errors.Is(err, sql.ErrNoRows) {
return false, 0
} else {
log.Panicf("Could not load user '%s': %v", user.Name, err)
}
return true, dbUser.ID
}
func handleLogin(w http.ResponseWriter, r *http.Request) {
u := user{}
form.Parse(r, &u)
ok, userId := checkLogin(r.Context(), u)
if !ok {
u.Errors = []error{form.FieldError{Field: "Password", Issue: "Invalid"}}
showLoginPage(w, u)
return
}
s := session.From(r)
if u.RememberMe {
s.MaxAge(sessionDuration) // 1 week
} else {
s.MaxAge(0)
}
s.UserID = userId
s.Authenticated = true
s.Save(w, r)
// redirect
next := r.URL.Query().Get(loginQueryMarker)
if next == "" {
next = "/"
}
http.Redirect(w, r, next, http.StatusFound)
}
func showLoginPage(w http.ResponseWriter, u user) {
showTemplate(w, "login", u)
}
|