-
Notifications
You must be signed in to change notification settings - Fork 0
/
auth.go
229 lines (188 loc) · 5.48 KB
/
auth.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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
package main
import (
"encoding/json"
"errors"
"fmt"
"github.com/gomodule/redigo/redis"
"github.com/satori/go.uuid"
"github.com/zmb3/spotify"
"golang.org/x/oauth2"
"net/http"
"spotify-live-lyricist/pkg/encrypt"
"time"
)
type session struct {
Token []byte
LastActivity time.Time
}
const sessionLength = 900 // 30 mins
var (
states = make(map[string]string) // sID, oauth state
sessions = make(map[string]session) // sessionId, session
lastSessionsCleaned time.Time
)
func authMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func (w http.ResponseWriter, req *http.Request) {
if req.URL.Path != "/authenticate" && req.URL.Path != "/callback" {
c, err := req.Cookie("session")
if err != nil {
http.Redirect(w, req, "/authenticate", http.StatusSeeOther)
return
}
s, err := getSessionFromRedis(c.Value)
if err == nil {
s.LastActivity = time.Now()
err := setSession(c.Value, *s)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
} else if err == redis.ErrNil {
http.Redirect(w, req, "/authenticate", http.StatusSeeOther)
return
} else {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// refresh session
c.MaxAge = sessionLength
http.SetCookie(w, c)
}
next.ServeHTTP(w, req)
})
}
func initAuth(w http.ResponseWriter, r *http.Request) {
// create cookie for oauth state
sID, _ := uuid.NewV4()
state, _ := uuid.NewV4()
c := &http.Cookie{
Name: "sID",
Value: sID.String(),
}
c.MaxAge = sessionLength
http.SetCookie(w, c)
url := spotifyAuth.AuthURL(state.String())
states[sID.String()] = state.String()
http.Redirect(w, r, url, http.StatusTemporaryRedirect)
}
func completeAuth(w http.ResponseWriter, r *http.Request) {
tok, err := checkStateAndGetToken(w, r)
if err != nil {
fmt.Print(err)
return
}
encToken, err := marshalAndEncryptToken(w, tok)
if err != nil {
http.Error(w, fmt.Sprintf("Token Error: %s", err.Error()), http.StatusInternalServerError)
return
}
_, err = createSession(w, encToken)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
//fmt.Println("Successfully authenticated")
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
}
// Looks for sID cookie (which represents oauth state), checks if it matched, get token and deletes state
func checkStateAndGetToken(w http.ResponseWriter, r *http.Request) (*oauth2.Token, error) {
sID, err := r.Cookie("sID")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return nil, err
}
// delete cookie from client
sID.MaxAge = -1
http.SetCookie(w, sID)
state, ok := states[sID.Value]
if !ok {
http.Error(w, "OAuth state not found", http.StatusInternalServerError)
return nil, errors.New("OAuth state not found")
}
if st := r.FormValue("state"); st != state {
http.Error(w, fmt.Sprintf("State mismatch: %s != %s\n", st, state), http.StatusNotFound)
return nil, errors.New("State mismatch\n")
}
tok, err := spotifyAuth.Token(state, r)
if err != nil {
http.Error(w, "Couldn't get token", http.StatusForbidden)
return nil, err
}
// state no longer needed
delete(states, sID.Value)
return tok, nil
}
func marshalAndEncryptToken(w http.ResponseWriter, tok *oauth2.Token) ([]byte, error) {
bs, err := json.Marshal(*tok)
if err != nil {
return nil, err
}
enc := encrypt.Encrypt(key, string(bs))
return enc, nil
}
// Passing encrypted access token forces binding between local sessions and oAuth sessions.
func createSession(w http.ResponseWriter, encToken []byte) (*session, error) {
// create session
sID, _ := uuid.NewV4()
c := &http.Cookie{
Name: "session",
Value: sID.String(),
}
c.MaxAge = sessionLength
http.SetCookie(w, c)
s := session{encToken,time.Now()}
// Save to Redis
//fmt.Printf("SessionID: %s\n", sID.String())
err := setSession(c.Value, s)
if err != nil {
return nil, err
}
return &s, nil
}
// getClient gets token from session and exchanges for client.
// This function takes both the ReponseWriter and the Request,
// so it will handle its own errors instead of leaving that to the handler
func getClient(w http.ResponseWriter, req *http.Request) (*spotify.Client, error) {
token := &oauth2.Token{}
// get session from cookie
sesh, err := getSession(w, req)
if err == redis.ErrNil {
http.Redirect(w, req, "/authenticate", http.StatusTemporaryRedirect)
return nil, err // return error here so that the caller handler also returns
} else if err != nil {
return nil, err
}
// get token from session
jsonToken := encrypt.Decrypt(key, sesh.Token)
err = json.Unmarshal([]byte(jsonToken), token)
if err != nil {
http.Error(w, fmt.Sprintf("Error unmarshalling token: %s", err.Error()), http.StatusInternalServerError)
return nil, err
}
client := spotifyAuth.NewClient(token)
return &client, nil
}
func getSession(w http.ResponseWriter, req *http.Request) (*session, error) {
c, err := req.Cookie("session")
if err != nil {
return nil, err
}
sesh, err := getSessionFromRedis(c.Value)
if err != nil {
return nil, err
}
return sesh, nil
}
func logout(w http.ResponseWriter, req *http.Request) {
c, err := req.Cookie("session")
if err != nil {
http.Error(w, "Internal Server Error", http.StatusInternalServerError)
return
}
c.MaxAge = -1
http.SetCookie(w, c)
if err := deleteSession(c.Value); err != nil {
http.Error(w, "Internal Server Error", http.StatusInternalServerError)
return
}
fmt.Fprint(w, "Successfully logged out")
}