-
-
Notifications
You must be signed in to change notification settings - Fork 32
/
auth.go
426 lines (353 loc) · 10.9 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
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
package nakama
import (
"bytes"
"context"
"database/sql"
"errors"
"fmt"
"html/template"
"net/url"
"strings"
"time"
"github.com/cockroachdb/cockroach-go/v2/crdb"
"github.com/hako/branca"
"github.com/hako/durafmt"
"github.com/nakamauwu/nakama/web"
)
// KeyAuthUserID to use in context.
const KeyAuthUserID = ctxkey("auth_user_id")
const (
emailVerificationCodeTTL = time.Hour * 2
authTokenTTL = time.Hour * 24 * 14
)
var (
// ErrInvalidRedirectURI denotes an invalid redirect URI.
ErrInvalidRedirectURI = InvalidArgumentError("invalid redirect URI")
// ErrUntrustedRedirectURI denotes an untrusted redirect URI.
// That is an URI that is not in the same host as the nakama.
ErrUntrustedRedirectURI = PermissionDeniedError("untrusted redirect URI")
// ErrInvalidToken denotes an invalid token.
ErrInvalidToken = InvalidArgumentError("invalid token")
// ErrExpiredToken denotes that the token already expired.
ErrExpiredToken = UnauthenticatedError("expired token")
// ErrInvalidVerificationCode denotes an invalid verification code.
ErrInvalidVerificationCode = InvalidArgumentError("invalid verification code")
// ErrVerificationCodeNotFound denotes a not found verification code.
ErrVerificationCodeNotFound = NotFoundError("verification code not found")
)
type ctxkey string
// TokenOutput response.
type TokenOutput struct {
Token string `json:"token"`
ExpiresAt time.Time `json:"expiresAt"`
}
// AuthOutput response.
type AuthOutput struct {
User User `json:"user"`
Token string `json:"token"`
ExpiresAt time.Time `json:"expiresAt"`
}
type SendMagicLink struct {
UpdateEmail bool `json:"updateEmail"`
Email string `json:"email"`
RedirectURI string `json:"redirectURI"`
}
// SendMagicLink to login without passwords.
// Or to update and verify a new email address.
// A second endpoint GET /api/verify_magic_link?email&code&redirect_uri must exist.
func (s *Service) SendMagicLink(ctx context.Context, in SendMagicLink) error {
in.Email = strings.TrimSpace(in.Email)
in.Email = strings.ToLower(in.Email)
if !reEmail.MatchString(in.Email) {
return ErrInvalidEmail
}
_, err := s.ParseRedirectURI(in.RedirectURI)
if err != nil {
return err
}
if in.UpdateEmail {
uid, ok := ctx.Value(KeyAuthUserID).(string)
if !ok {
return ErrUnauthenticated
}
query := `
SELECT EXISTS (
SELECT 1 FROM users WHERE email = $1 AND id != $2
)
`
var exists bool
row := s.DB.QueryRowContext(ctx, query, in.Email, uid)
err := row.Scan(&exists)
if err != nil {
return fmt.Errorf("sql query select email existence: %w", err)
}
if exists {
return ErrEmailTaken
}
}
var row *sql.Row
if in.UpdateEmail {
uid, _ := ctx.Value(KeyAuthUserID).(string)
query := "INSERT INTO email_verification_codes (user_id, email) VALUES ($1, $2) RETURNING code"
row = s.DB.QueryRowContext(ctx, query, uid, in.Email)
} else {
query := "INSERT INTO email_verification_codes (email) VALUES ($1) RETURNING code"
row = s.DB.QueryRowContext(ctx, query, in.Email)
}
var code string
err = row.Scan(&code)
if err != nil {
return fmt.Errorf("could not insert verification code: %w", err)
}
defer func() {
if err != nil {
go func() {
query := "DELETE FROM email_verification_codes WHERE email = $1 AND code = $2"
_, err := s.DB.Exec(query, in.Email, code)
if err != nil {
_ = s.Logger.Log("error", fmt.Errorf("could not delete verification code: %w", err))
}
}()
}
}()
// See transport/http/handler.go
// GET /api/verify_magic_link must exist.
magicLink := cloneURL(s.Origin)
magicLink.Path = "/api/verify_magic_link"
q := magicLink.Query()
q.Set("email", in.Email)
q.Set("verification_code", code)
q.Set("redirect_uri", in.RedirectURI)
magicLink.RawQuery = q.Encode()
s.magicLinkTmplOncer.Do(func() {
var text []byte
text, err = web.TemplateFiles.ReadFile("template/mail/magic-link.html.tmpl")
if err != nil {
err = fmt.Errorf("could not read magic link template file: %w", err)
return
}
s.magicLinkTmpl, err = template.
New("mail/magic-link.html").
Funcs(template.FuncMap{
"human_duration": func(d time.Duration) string {
return durafmt.Parse(d).LimitFirstN(1).String()
},
"html": func(s string) template.HTML {
return template.HTML(s)
},
}).
Parse(string(text))
if err != nil {
err = fmt.Errorf("could not parse magic link mail template: %w", err)
return
}
})
if err != nil {
return err
}
var b bytes.Buffer
err = s.magicLinkTmpl.Execute(&b, map[string]interface{}{
"UpdateEmail": in.UpdateEmail,
"Origin": s.Origin,
"MagicLink": magicLink,
"TTL": emailVerificationCodeTTL,
})
if err != nil {
return fmt.Errorf("could not execute magic link mail template: %w", err)
}
var subject string
if in.UpdateEmail {
subject = "Update email at Nakama"
} else {
subject = "Login to Nakama"
}
err = s.Sender.Send(in.Email, subject, b.String(), magicLink.String())
if err != nil {
return fmt.Errorf("could not send magic link: %w", err)
}
return nil
}
// ParseRedirectURI the given redirect URI and validates it.
func (s *Service) ParseRedirectURI(rawurl string) (*url.URL, error) {
uri, err := url.Parse(rawurl)
if err != nil || !uri.IsAbs() {
return nil, ErrInvalidRedirectURI
}
if uri.Host == s.Origin.Host || strings.HasSuffix(uri.Host, "."+s.Origin.Host) {
return uri, nil
}
for _, origin := range s.AllowedOrigins {
if strings.Contains(origin, uri.Host) {
return uri, nil
}
}
return nil, ErrUntrustedRedirectURI
}
// VerifyMagicLink checks whether the given email and verification code exists and issues a new auth token.
// If the user does not exists, it can create a new one with the given username.
func (s *Service) VerifyMagicLink(ctx context.Context, email, code string, username *string) (AuthOutput, error) {
var auth AuthOutput
email = strings.TrimSpace(email)
email = strings.ToLower(email)
if !reEmail.MatchString(email) {
return auth, ErrInvalidEmail
}
if !reUUID.MatchString(code) {
return auth, ErrInvalidVerificationCode
}
if username != nil && !ValidUsername(*username) {
return auth, ErrInvalidUsername
}
err := crdb.ExecuteTx(ctx, s.DB, nil, func(tx *sql.Tx) error {
var userID sql.NullString
var createdAt time.Time
query := "SELECT user_id, created_at FROM email_verification_codes WHERE email = $1 AND code = $2"
row := tx.QueryRowContext(ctx, query, email, code)
err := row.Scan(&userID, &createdAt)
if err == sql.ErrNoRows {
return ErrVerificationCodeNotFound
}
if err != nil {
return fmt.Errorf("could not sql query select verification code: %w", err)
}
if isVerificationCodeExpired(createdAt) {
return ErrExpiredToken
}
// not login but update email.
if userID.Valid {
query := "UPDATE users SET email = $1 WHERE id = $2 RETURNING id, username, avatar"
row = tx.QueryRowContext(ctx, query, email, userID.String)
} else {
query := "SELECT id, username, avatar FROM users WHERE email = $1"
row = tx.QueryRowContext(ctx, query, email)
}
var avatar sql.NullString
err = row.Scan(&auth.User.ID, &auth.User.Username, &avatar)
if err == sql.ErrNoRows {
if username == nil {
return ErrUserNotFound
}
query := "INSERT INTO users (email, username) VALUES ($1, $2) RETURNING id"
row := tx.QueryRowContext(ctx, query, email, username)
err := row.Scan(&auth.User.ID)
if isUniqueViolation(err) {
if strings.Contains(err.Error(), "email") {
return ErrEmailTaken
}
if strings.Contains(err.Error(), "username") {
return ErrUsernameTaken
}
}
if err != nil {
return fmt.Errorf("could not sql insert user at magic link: %w", err)
}
auth.User.Username = *username
return nil
}
if err != nil {
return fmt.Errorf("could not sql query select user from verification code email: %w", err)
}
auth.User.AvatarURL = s.avatarURL(avatar)
return nil
})
if err != nil {
return auth, err
}
auth.ExpiresAt = time.Now().Add(authTokenTTL)
auth.Token, err = s.codec().EncodeToString(auth.User.ID)
if err != nil {
return auth, fmt.Errorf("could not create auth token: %w", err)
}
go func() {
_, err := s.DB.Exec("DELETE FROM email_verification_codes WHERE email = $1 AND code = $2", email, code)
if err != nil {
_ = s.Logger.Log("error", fmt.Errorf("could not delete verification code: %w", err))
return
}
}()
return auth, nil
}
func isVerificationCodeExpired(t time.Time) bool {
now := time.Now()
exp := t.Add(emailVerificationCodeTTL)
return exp.Equal(now) || exp.Before(now)
}
// DevLogin is a login for development purposes only.
// TODO: disable dev login on production.
func (s *Service) DevLogin(ctx context.Context, email string) (AuthOutput, error) {
var out AuthOutput
if s.DisabledDevLogin {
return out, ErrUnimplemented
}
email = strings.TrimSpace(email)
email = strings.ToLower(email)
if !reEmail.MatchString(email) {
return out, ErrInvalidEmail
}
var avatar sql.NullString
query := "SELECT id, username, avatar FROM users WHERE email = $1"
err := s.DB.QueryRowContext(ctx, query, email).Scan(&out.User.ID, &out.User.Username, &avatar)
if err == sql.ErrNoRows {
return out, ErrUserNotFound
}
if err != nil {
return out, fmt.Errorf("could not query select user: %w", err)
}
out.User.AvatarURL = s.avatarURL(avatar)
out.Token, err = s.codec().EncodeToString(out.User.ID)
if err != nil {
return out, fmt.Errorf("could not create token: %w", err)
}
out.ExpiresAt = time.Now().Add(authTokenTTL)
return out, nil
}
// AuthUserIDFromToken decodes the token into a user ID.
func (s *Service) AuthUserIDFromToken(token string) (string, error) {
uid, err := s.codec().DecodeToString(token)
if err != nil {
if errors.Is(err, branca.ErrInvalidToken) || errors.Is(err, branca.ErrInvalidTokenVersion) {
return "", ErrInvalidToken
}
if _, ok := err.(*branca.ErrExpiredToken); ok {
return "", ErrExpiredToken
}
// check branca unexported/internal chacha20poly1305 error for invalid key.
if strings.HasSuffix(err.Error(), "authentication failed") {
return "", ErrUnauthenticated
}
return "", fmt.Errorf("could not decode token: %w", err)
}
if !reUUID.MatchString(uid) {
return "", ErrInvalidUserID
}
return uid, nil
}
// AuthUser is the current authenticated user.
func (s *Service) AuthUser(ctx context.Context) (User, error) {
var u User
uid, ok := ctx.Value(KeyAuthUserID).(string)
if !ok {
return u, ErrUnauthenticated
}
return s.userByID(ctx, uid)
}
// Token to authenticate requests.
func (s *Service) Token(ctx context.Context) (TokenOutput, error) {
var out TokenOutput
uid, ok := ctx.Value(KeyAuthUserID).(string)
if !ok {
return out, ErrUnauthenticated
}
var err error
out.Token, err = s.codec().EncodeToString(uid)
if err != nil {
return out, fmt.Errorf("could not create token: %w", err)
}
out.ExpiresAt = time.Now().Add(authTokenTTL)
return out, nil
}
func (s *Service) codec() *branca.Branca {
cdc := branca.NewBranca(s.TokenKey)
cdc.SetTTL(uint32(authTokenTTL.Seconds()))
return cdc
}