-
Notifications
You must be signed in to change notification settings - Fork 2
/
configuration.go
169 lines (137 loc) · 4.25 KB
/
configuration.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
157
158
159
160
161
162
163
164
165
166
167
168
169
package onelogin
import (
"context"
"encoding/json"
"errors"
"net/http"
"time"
"github.com/MicahParks/keyfunc"
"github.com/golang-jwt/jwt/v4"
)
const (
openidConfigurationEndpoint = "/.well-known/openid-configuration"
refreshInterval = 24 * time.Hour
refreshRateLimit = time.Minute
refreshTimeout = 30 * time.Second
)
var ErrConfigurationMissing = errors.New("openid configuration missing")
type openidConfiguration struct {
AuthorizationEndpoint string `json:"authorization_endpoint"`
TokenEndpoint string `json:"token_endpoint"`
Issuer string `json:"issuer"`
UserinfoEndpoint string `json:"userinfo_endpoint"`
JwksURI string `json:"jwks_uri"`
EndSessionEndpoint string `json:"end_session_endpoint"`
}
type configurationClient struct {
ctx context.Context
logger Logger
httpClient *http.Client
issuer string
now func() time.Time
refreshRequest chan (struct{})
currentConfiguration *openidConfiguration
currentJwks *keyfunc.JWKS
}
func getConfiguration(ctx context.Context, logger Logger, httpClient *http.Client, issuer string) *configurationClient {
client := &configurationClient{
ctx: ctx,
logger: logger,
httpClient: httpClient,
issuer: issuer,
now: time.Now,
// only allow a single request to be waiting
refreshRequest: make(chan struct{}, 1),
}
if err := client.refresh(); err != nil {
logger.Print("error refreshing openid configuration:", err)
}
go client.backgroundRefresh()
return client
}
func (c *configurationClient) AuthorizationEndpoint() (string, error) {
if c.currentConfiguration == nil {
c.requestRefresh()
return "", ErrConfigurationMissing
}
return c.currentConfiguration.AuthorizationEndpoint, nil
}
func (c *configurationClient) EndSessionEndpoint() (string, error) {
if c.currentConfiguration == nil {
c.requestRefresh()
return "", ErrConfigurationMissing
}
return c.currentConfiguration.EndSessionEndpoint, nil
}
func (c *configurationClient) UserinfoEndpoint() (string, error) {
if c.currentConfiguration == nil {
c.requestRefresh()
return "", ErrConfigurationMissing
}
return c.currentConfiguration.UserinfoEndpoint, nil
}
func (c *configurationClient) ForExchange() (tokenEndpoint string, keyfunc jwt.Keyfunc, issuer string, err error) {
if c.currentConfiguration == nil || c.currentJwks == nil {
c.requestRefresh()
return "", nil, "", ErrConfigurationMissing
}
return c.currentConfiguration.TokenEndpoint, c.currentJwks.Keyfunc, c.currentConfiguration.Issuer, nil
}
// requestRefresh will request that the configuration is refreshed, if no other request is waiting
func (c *configurationClient) requestRefresh() {
select {
case c.refreshRequest <- struct{}{}:
default:
}
}
// refresh updates the current configuration
func (c *configurationClient) refresh() error {
ctx, cancel := context.WithTimeout(c.ctx, refreshTimeout)
defer cancel()
req, err := http.NewRequestWithContext(ctx, "GET", c.issuer+openidConfigurationEndpoint, nil)
if err != nil {
return err
}
res, err := c.httpClient.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
var v openidConfiguration
if err := json.NewDecoder(res.Body).Decode(&v); err != nil {
return err
}
c.currentConfiguration = &v
c.currentJwks, err = keyfunc.Get(c.currentConfiguration.JwksURI, keyfunc.Options{
Client: c.httpClient,
Ctx: c.ctx,
RefreshErrorHandler: func(err error) {
c.logger.Print("error refreshing jwks: ", err)
},
RefreshInterval: refreshInterval,
RefreshRateLimit: refreshRateLimit,
RefreshTimeout: refreshTimeout,
RefreshUnknownKID: true,
})
return err
}
// backgroundRefresh triggers refresh periodically on refreshInterval, or when requested limited by refreshRateLimit
func (c *configurationClient) backgroundRefresh() {
lastRefresh := c.now().Add(-refreshRateLimit)
for {
select {
case <-time.After(refreshInterval):
c.requestRefresh()
case <-c.refreshRequest:
if lastRefresh.Add(refreshRateLimit).After(c.now()) {
continue
}
if err := c.refresh(); err != nil {
c.logger.Print("error refreshing openid configuration: ", err.Error())
}
lastRefresh = c.now()
case <-c.ctx.Done():
return
}
}
}