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
package handlers
import (
"context"
"log"
"net/http"
"tixe/auth"
"tixe/db"
"tixe/types"
"github.com/gin-contrib/sessions"
"github.com/gin-gonic/gin"
"github.com/jackc/pgx/v5"
"github.com/oklog/ulid/v2"
)
func AuthCallback(auth *auth.Auth) gin.HandlerFunc {
return func(c *gin.Context) {
session := sessions.Default(c)
if c.Query("state") != session.Get("state") {
c.String(http.StatusBadRequest, "Invalid state parameter!")
return
}
token, err := auth.Exchange(c.Request.Context(), c.Query("code"))
if err != nil {
c.String(http.StatusUnauthorized, "Failed to exchange authorization code for token!")
return
}
idToken, err := auth.VerifyIDToken(c.Request.Context(), token)
if err != nil {
c.String(http.StatusInternalServerError, "Failed to verify ID token!")
return
}
var profile map[string]interface{}
if err := idToken.Claims(&profile); err != nil {
log.Printf("[tixe/auth] ERROR: Failed to get claims")
c.String(http.StatusInternalServerError, "Failed to get claims!")
return
}
// Try to get the relevant details of the user
var userId, userDisplayName string
// idToken.Subject should be unique and should not change.
// I think. Maybe. Possibly. Hopefully.
scanErr := db.PgPool.QueryRow(context.Background(),
"SELECT id, display_name FROM users WHERE oidc_subject = $1", idToken.Subject).Scan(&userId, &userDisplayName)
if scanErr == pgx.ErrNoRows {
log.Printf("[tixe/auth] New user detected logging in, creating entry in database")
// The user does not exist in the db, create it
userId = ulid.Make().String()
userDisplayName = profile["name"].(string)
_, err = db.PgPool.Exec(context.Background(),
"INSERT INTO users(id, display_name, oidc_subject) VALUES($1, $2, $3)",
userId, userDisplayName, idToken.Subject)
if err != nil {
log.Printf("[tixe/auth] ERROR: Could not create database entry for oidc user")
c.String(http.StatusInternalServerError, "Could not create database entry for oidc user")
return
}
} else if scanErr != nil {
// scanErr was some other error than ErrNoRows
log.Printf("[tixe/auth] ERROR: Could not query database for oidc user: %v", scanErr)
c.String(http.StatusInternalServerError, "Could not query database for oidc user")
return
}
// The user.Id field is read in other requests to read user data from the db
session.Set("user", types.User { Id: userId, DisplayName: userDisplayName })
session.Set("access_token", token.AccessToken)
session.Set("profile", profile)
if err := session.Save(); err != nil {
log.Printf("[tixe/auth] ERROR: Failed to save session: %v", err)
c.String(http.StatusInternalServerError, "Failed to save session!")
return
}
c.Redirect(http.StatusTemporaryRedirect, "/")
}
}