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
|
package authmodel
import (
"context"
"net/http"
"github.com/sassoftware/relic/v7/config"
"github.com/sassoftware/relic/v7/internal/zhttp"
"github.com/sassoftware/relic/v7/lib/audit"
)
type ctxKey int
var ctxKeyUserInfo ctxKey = 1
type Authenticator interface {
Authenticate(req *http.Request) (UserInfo, error)
}
type UserInfo interface {
// Allowed checks whether the named key is visible to the current user
Allowed(*config.KeyConfig) bool
// AuditContext amends an audit record with the authenticated user's name
// and other relevant details
AuditContext(info *audit.Info)
}
// New creates an authenticator based on the provided server configuration
func New(conf *config.Config) (Authenticator, error) {
switch {
case conf.Server.PolicyURL != "":
return newPolicyAuthenticator(conf)
default:
return &CertificateAuth{Config: conf}, nil
}
}
// Middleware checks each request for authentication. If successful, the user's
// information is appended to the log context and request context. If not, an
// error is returned and the inner handler is skipped.
func Middleware(a Authenticator) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
info, err := a.Authenticate(r)
if err != nil {
if h, ok := err.(http.Handler); ok {
h.ServeHTTP(w, r)
} else {
zhttp.WriteUnhandledError(w, r, err, "")
}
return
} else if info == nil {
panic("authenticator returned nil without an error")
}
ctx := r.Context()
ctx = context.WithValue(ctx, ctxKeyUserInfo, info)
r = r.WithContext(ctx)
next.ServeHTTP(w, r)
})
}
}
// RequestInfo returns information about the calling user
func RequestInfo(req *http.Request) UserInfo {
info, ok := req.Context().Value(ctxKeyUserInfo).(UserInfo)
if !ok {
// middleware should guarantee this is always present, otherwise
// something is seriously wrong
panic("userinfo missing from request context")
}
return info
}
|
