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
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
// Copyright 2024 New Vector Ltd.
// Copyright 2021-2024 The Matrix.org Foundation C.I.C.
//
// SPDX-License-Identifier: AGPL-3.0-only
// Please see LICENSE in the repository root for full details.

//! Error types returned by an authorization server.

use std::borrow::Cow;

use serde::{Deserialize, Serialize};
use serde_with::{DeserializeFromStr, SerializeDisplay};

/// A client error returned by an authorization server.
///
/// To construct this with a default description for the error code, use its
/// `From<ClientErrorCode>` implementation.
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct ClientError {
    /// The error code.
    pub error: ClientErrorCode,

    /// A human-readable description of the error.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub error_description: Option<Cow<'static, str>>,
}

impl ClientError {
    /// Creates a new `ClientError` with the given error code and description.
    #[must_use]
    pub const fn new(error: ClientErrorCode, error_description: &'static str) -> Self {
        Self {
            error,
            error_description: Some(Cow::Borrowed(error_description)),
        }
    }

    /// Changes the description of this `ClientError` with the given `String`.
    #[must_use]
    pub fn with_description(mut self, description: String) -> Self {
        self.error_description = Some(Cow::Owned(description));
        self
    }
}

impl From<ClientErrorCode> for ClientError {
    fn from(error: ClientErrorCode) -> Self {
        let desc = error.default_description();
        Self::new(error, desc)
    }
}

/// Client error codes defined in OAuth2.0, OpenID Connect and their extensions.
#[derive(Debug, Clone, PartialEq, Eq, SerializeDisplay, DeserializeFromStr)]
pub enum ClientErrorCode {
    /// `invalid_request`
    ///
    /// The request is missing a required parameter, includes an invalid
    /// parameter value, includes a parameter more than once, or is otherwise
    /// malformed.
    ///
    /// From [RFC6749](https://www.rfc-editor.org/rfc/rfc6749#section-5.2).
    InvalidRequest,

    /// `invalid_client`
    ///
    /// Client authentication failed (e.g., unknown client, no client
    /// authentication included, or unsupported authentication method).
    ///
    /// From [RFC6749](https://www.rfc-editor.org/rfc/rfc6749#section-5.2).
    InvalidClient,

    /// `invalid_grant`
    ///
    /// The provided authorization grant (e.g., authorization code, resource
    /// owner credentials) or refresh token is invalid, expired, revoked, does
    /// not match the redirection URI used in the authorization request, or was
    /// issued to another client.
    ///
    /// From [RFC6749](https://www.rfc-editor.org/rfc/rfc6749#section-5.2).
    InvalidGrant,

    /// `unauthorized_client`
    ///
    /// The authenticated client is not authorized to use this authorization
    /// grant type.
    ///
    /// From [RFC6749](https://www.rfc-editor.org/rfc/rfc6749#section-5.2).
    UnauthorizedClient,

    /// `unsupported_grant_type`
    ///
    /// The authorization grant type is not supported by the authorization
    /// server.
    ///
    /// From [RFC6749](https://www.rfc-editor.org/rfc/rfc6749#section-5.2).
    UnsupportedGrantType,

    /// `access_denied`
    ///
    /// The resource owner or authorization server denied the request.
    ///
    /// From [RFC6749](https://www.rfc-editor.org/rfc/rfc6749#section-4.1.2.1).
    AccessDenied,

    /// `unsupported_response_type`
    ///
    /// The authorization server does not support obtaining an authorization
    /// code using this method.
    ///
    /// From [RFC6749](https://www.rfc-editor.org/rfc/rfc6749#section-4.1.2.1).
    UnsupportedResponseType,

    /// `invalid_scope`
    ///
    /// The requested scope is invalid, unknown, malformed, or exceeds the scope
    /// granted by the resource owner.
    ///
    /// From [RFC6749](https://www.rfc-editor.org/rfc/rfc6749#section-4.1.2.1).
    InvalidScope,

    /// `server_error`
    ///
    /// The authorization server encountered an unexpected condition that
    /// prevented it from fulfilling the request.
    ///
    /// From [RFC6749](https://www.rfc-editor.org/rfc/rfc6749#section-4.1.2.1).
    ServerError,

    /// `temporarily_unavailable`
    ///
    /// The authorization server is currently unable to handle the request due
    /// to a temporary overloading or maintenance of the server.
    ///
    /// From [RFC6749](https://www.rfc-editor.org/rfc/rfc6749#section-4.1.2.1).
    TemporarilyUnavailable,

    /// `interaction_required`
    ///
    /// The authorization server requires end-user interaction of some form to
    /// proceed.
    ///
    /// From [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html#AuthError).
    InteractionRequired,

    /// `login_required`
    ///
    /// The authorization server requires end-user authentication.
    ///
    /// From [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html#AuthError).
    LoginRequired,

    /// `account_selection_required`
    ///
    /// The end-user is required to select a session at the authorization
    /// server.
    ///
    /// From [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html#AuthError).
    AccountSelectionRequired,

    /// `consent_required`
    ///
    /// The authorization server requires end-user consent.
    ///
    /// From [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html#AuthError).
    ConsentRequired,

    /// `invalid_request_uri`
    ///
    /// The `request_uri` in the authorization request returns an error or
    /// contains invalid data.
    ///
    /// From [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html#AuthError).
    InvalidRequestUri,

    /// `invalid_request_object`
    ///
    /// The request parameter contains an invalid request object.
    ///
    /// From [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html#AuthError).
    InvalidRequestObject,

    /// `request_not_supported`
    ///
    /// The authorization server does not support use of the `request`
    /// parameter.
    ///
    /// From [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html#AuthError).
    RequestNotSupported,

    /// `request_uri_not_supported`
    ///
    /// The authorization server does not support use of the `request_uri`
    /// parameter.
    ///
    /// From [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html#AuthError).
    RequestUriNotSupported,

    /// `registration_not_supported`
    ///
    /// The authorization server does not support use of the `registration`
    /// parameter.
    ///
    /// From [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html#AuthError).
    RegistrationNotSupported,

    /// `invalid_redirect_uri`
    ///
    /// The value of one or more redirection URIs is invalid.
    ///
    /// From [RFC7591](https://www.rfc-editor.org/rfc/rfc7591#section-3.2.2).
    InvalidRedirectUri,

    /// `invalid_client_metadata`
    ///
    /// The value of one of the client metadata fields is invalid and the server
    /// has rejected this request.
    ///
    /// From [RFC7591](https://www.rfc-editor.org/rfc/rfc7591#section-3.2.2).
    InvalidClientMetadata,

    /// `authorization_pending`
    ///
    /// The authorization request is still pending as the end user hasn't yet
    /// completed the user-interaction steps.
    ///
    /// The client should repeat the access token request to the token endpoint
    /// (a process known as polling).  Before each new request, the client
    /// must wait at least the number of seconds specified by the `interval`
    /// parameter of the device authorization response, or 5 seconds if none was
    /// provided, and respect any increase in the polling interval required
    /// by the [`ClientErrorCode::SlowDown`] error.
    ///
    /// From [RFC8628](https://www.rfc-editor.org/rfc/rfc8628#section-3.5).
    AuthorizationPending,

    /// `slow_down`
    ///
    /// A variant of [`ClientErrorCode::AuthorizationPending`], the
    /// authorization request is still pending and polling should continue,
    /// but the interval must be increased by 5 seconds for this and all
    /// subsequent requests.
    ///
    /// From [RFC8628](https://www.rfc-editor.org/rfc/rfc8628#section-3.5).
    SlowDown,

    /// `expired_token`
    ///
    /// The `device_code` has expired, and the device authorization session has
    /// concluded.
    ///
    /// The client may commence a new device authorization request but should
    /// wait for user interaction before restarting to avoid unnecessary
    /// polling.
    ///
    /// From [RFC8628](https://www.rfc-editor.org/rfc/rfc8628#section-3.5).
    ExpiredToken,

    /// `unsupported_token_type`
    ///
    /// The authorization server does not support the revocation of the
    /// presented token type.  That is, the client tried to revoke an access
    /// token on a server not supporting this feature.
    ///
    /// From [RFC7009](https://www.rfc-editor.org/rfc/rfc7009#section-2.2.1).
    UnsupportedTokenType,

    /// Another error code.
    Unknown(String),
}

impl core::fmt::Display for ClientErrorCode {
    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        match self {
            ClientErrorCode::InvalidRequest => f.write_str("invalid_request"),
            ClientErrorCode::InvalidClient => f.write_str("invalid_client"),
            ClientErrorCode::InvalidGrant => f.write_str("invalid_grant"),
            ClientErrorCode::UnauthorizedClient => f.write_str("unauthorized_client"),
            ClientErrorCode::UnsupportedGrantType => f.write_str("unsupported_grant_type"),
            ClientErrorCode::AccessDenied => f.write_str("access_denied"),
            ClientErrorCode::UnsupportedResponseType => f.write_str("unsupported_response_type"),
            ClientErrorCode::InvalidScope => f.write_str("invalid_scope"),
            ClientErrorCode::ServerError => f.write_str("server_error"),
            ClientErrorCode::TemporarilyUnavailable => f.write_str("temporarily_unavailable"),
            ClientErrorCode::InteractionRequired => f.write_str("interaction_required"),
            ClientErrorCode::LoginRequired => f.write_str("login_required"),
            ClientErrorCode::AccountSelectionRequired => f.write_str("account_selection_required"),
            ClientErrorCode::ConsentRequired => f.write_str("consent_required"),
            ClientErrorCode::InvalidRequestUri => f.write_str("invalid_request_uri"),
            ClientErrorCode::InvalidRequestObject => f.write_str("invalid_request_object"),
            ClientErrorCode::RequestNotSupported => f.write_str("request_not_supported"),
            ClientErrorCode::RequestUriNotSupported => f.write_str("request_uri_not_supported"),
            ClientErrorCode::RegistrationNotSupported => f.write_str("registration_not_supported"),
            ClientErrorCode::InvalidRedirectUri => f.write_str("invalid_redirect_uri"),
            ClientErrorCode::InvalidClientMetadata => f.write_str("invalid_client_metadata"),
            ClientErrorCode::AuthorizationPending => f.write_str("authorization_pending"),
            ClientErrorCode::SlowDown => f.write_str("slow_down"),
            ClientErrorCode::ExpiredToken => f.write_str("expired_token"),
            ClientErrorCode::UnsupportedTokenType => f.write_str("unsupported_token_type"),
            ClientErrorCode::Unknown(value) => f.write_str(value),
        }
    }
}

impl core::str::FromStr for ClientErrorCode {
    type Err = core::convert::Infallible;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            "invalid_request" => Ok(ClientErrorCode::InvalidRequest),
            "invalid_client" => Ok(ClientErrorCode::InvalidClient),
            "invalid_grant" => Ok(ClientErrorCode::InvalidGrant),
            "unauthorized_client" => Ok(ClientErrorCode::UnauthorizedClient),
            "unsupported_grant_type" => Ok(ClientErrorCode::UnsupportedGrantType),
            "access_denied" => Ok(ClientErrorCode::AccessDenied),
            "unsupported_response_type" => Ok(ClientErrorCode::UnsupportedResponseType),
            "invalid_scope" => Ok(ClientErrorCode::InvalidScope),
            "server_error" => Ok(ClientErrorCode::ServerError),
            "temporarily_unavailable" => Ok(ClientErrorCode::TemporarilyUnavailable),
            "interaction_required" => Ok(ClientErrorCode::InteractionRequired),
            "login_required" => Ok(ClientErrorCode::LoginRequired),
            "account_selection_required" => Ok(ClientErrorCode::AccountSelectionRequired),
            "consent_required" => Ok(ClientErrorCode::ConsentRequired),
            "invalid_request_uri" => Ok(ClientErrorCode::InvalidRequestUri),
            "invalid_request_object" => Ok(ClientErrorCode::InvalidRequestObject),
            "request_not_supported" => Ok(ClientErrorCode::RequestNotSupported),
            "request_uri_not_supported" => Ok(ClientErrorCode::RequestUriNotSupported),
            "registration_not_supported" => Ok(ClientErrorCode::RegistrationNotSupported),
            "invalid_redirect_uri" => Ok(ClientErrorCode::InvalidRedirectUri),
            "invalid_client_metadata" => Ok(ClientErrorCode::InvalidClientMetadata),
            "authorization_pending" => Ok(ClientErrorCode::AuthorizationPending),
            "slow_down" => Ok(ClientErrorCode::SlowDown),
            "expired_token" => Ok(ClientErrorCode::ExpiredToken),
            "unsupported_token_type" => Ok(ClientErrorCode::UnsupportedTokenType),
            _ => Ok(ClientErrorCode::Unknown(s.to_owned())),
        }
    }
}

impl ClientErrorCode {
    /// Get the default description for this `ClientErrorCode`.
    ///
    /// Note that [`ClientErrorCode::Unknown`] returns an empty string.
    #[must_use]
    pub fn default_description(&self) -> &'static str {
        match self {
            ClientErrorCode::InvalidRequest => {
                "The request is missing a required parameter, includes an \
                invalid parameter value, includes a parameter more than once, \
                or is otherwise malformed."
            }
            ClientErrorCode::InvalidClient => "Client authentication failed.",
            ClientErrorCode::InvalidGrant => {
                "The provided access grant is invalid, expired, or revoked."
            }
            ClientErrorCode::UnauthorizedClient => {
                "The client is not authorized to request an access token using this method."
            }
            ClientErrorCode::UnsupportedGrantType => {
                "The authorization grant type is not supported by the authorization server."
            }
            ClientErrorCode::AccessDenied => {
                "The resource owner or authorization server denied the request."
            }
            ClientErrorCode::UnsupportedResponseType => {
                "The authorization server does not support obtaining an access \
                token using this method."
            }
            ClientErrorCode::InvalidScope => {
                "The requested scope is invalid, unknown, or malformed."
            }
            ClientErrorCode::ServerError => {
                "The authorization server encountered an unexpected condition \
                that prevented it from fulfilling the request."
            }
            ClientErrorCode::TemporarilyUnavailable => {
                "The authorization server is currently unable to handle the request \
                due to a temporary overloading or maintenance of the server."
            }
            ClientErrorCode::InteractionRequired => {
                "The Authorization Server requires End-User interaction of some form to proceed."
            }
            ClientErrorCode::LoginRequired => {
                "The Authorization Server requires End-User authentication."
            }
            ClientErrorCode::AccountSelectionRequired => {
                "The End-User is required to select a session at the Authorization Server."
            }
            ClientErrorCode::ConsentRequired => {
                "The Authorization Server requires End-User consent."
            }
            ClientErrorCode::InvalidRequestUri => {
                "The request_uri in the Authorization Request returns an error \
                or contains invalid data."
            }
            ClientErrorCode::InvalidRequestObject => {
                "The request parameter contains an invalid Request Object."
            }
            ClientErrorCode::RequestNotSupported => {
                "The provider does not support use of the request parameter."
            }
            ClientErrorCode::RequestUriNotSupported => {
                "The provider does not support use of the request_uri parameter."
            }
            ClientErrorCode::RegistrationNotSupported => {
                "The provider does not support use of the registration parameter."
            }
            ClientErrorCode::InvalidRedirectUri => {
                "The value of one or more redirection URIs is invalid."
            }
            ClientErrorCode::InvalidClientMetadata => {
                "The value of one of the client metadata fields is invalid"
            }
            ClientErrorCode::AuthorizationPending => {
                "The authorization request is still pending"
            }
            ClientErrorCode::SlowDown => {
                "The interval must be increased by 5 seconds for this and all subsequent requests"
            }
            ClientErrorCode::ExpiredToken => {
                "The \"device_code\" has expired, and the device authorization session has concluded"
            }
            ClientErrorCode::UnsupportedTokenType => {
                "The authorization server does not support the revocation of the presented token type."
            },
            ClientErrorCode::Unknown(_) => "",
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn serialize_client_error_code() {
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::InvalidRequest).unwrap(),
            "\"invalid_request\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::InvalidClient).unwrap(),
            "\"invalid_client\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::InvalidGrant).unwrap(),
            "\"invalid_grant\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::UnauthorizedClient).unwrap(),
            "\"unauthorized_client\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::UnsupportedGrantType).unwrap(),
            "\"unsupported_grant_type\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::AccessDenied).unwrap(),
            "\"access_denied\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::UnsupportedResponseType).unwrap(),
            "\"unsupported_response_type\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::InvalidScope).unwrap(),
            "\"invalid_scope\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::ServerError).unwrap(),
            "\"server_error\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::TemporarilyUnavailable).unwrap(),
            "\"temporarily_unavailable\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::InteractionRequired).unwrap(),
            "\"interaction_required\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::LoginRequired).unwrap(),
            "\"login_required\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::AccountSelectionRequired).unwrap(),
            "\"account_selection_required\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::ConsentRequired).unwrap(),
            "\"consent_required\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::InvalidRequestUri).unwrap(),
            "\"invalid_request_uri\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::InvalidRequestObject).unwrap(),
            "\"invalid_request_object\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::RequestNotSupported).unwrap(),
            "\"request_not_supported\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::RequestUriNotSupported).unwrap(),
            "\"request_uri_not_supported\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::RegistrationNotSupported).unwrap(),
            "\"registration_not_supported\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::InvalidRedirectUri).unwrap(),
            "\"invalid_redirect_uri\""
        );
        assert_eq!(
            serde_json::to_string(&ClientErrorCode::InvalidClientMetadata).unwrap(),
            "\"invalid_client_metadata\""
        );

        assert_eq!(
            serde_json::to_string(&ClientErrorCode::Unknown("unknown_error_code".to_owned()))
                .unwrap(),
            "\"unknown_error_code\""
        );
    }

    #[test]
    fn deserialize_client_error_code() {
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"invalid_request\"").unwrap(),
            ClientErrorCode::InvalidRequest
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"invalid_client\"").unwrap(),
            ClientErrorCode::InvalidClient
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"invalid_grant\"").unwrap(),
            ClientErrorCode::InvalidGrant
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"unauthorized_client\"").unwrap(),
            ClientErrorCode::UnauthorizedClient
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"unsupported_grant_type\"").unwrap(),
            ClientErrorCode::UnsupportedGrantType
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"access_denied\"").unwrap(),
            ClientErrorCode::AccessDenied
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"unsupported_response_type\"").unwrap(),
            ClientErrorCode::UnsupportedResponseType
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"invalid_scope\"").unwrap(),
            ClientErrorCode::InvalidScope
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"server_error\"").unwrap(),
            ClientErrorCode::ServerError
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"temporarily_unavailable\"").unwrap(),
            ClientErrorCode::TemporarilyUnavailable
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"interaction_required\"").unwrap(),
            ClientErrorCode::InteractionRequired
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"login_required\"").unwrap(),
            ClientErrorCode::LoginRequired
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"account_selection_required\"").unwrap(),
            ClientErrorCode::AccountSelectionRequired
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"consent_required\"").unwrap(),
            ClientErrorCode::ConsentRequired
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"invalid_request_uri\"").unwrap(),
            ClientErrorCode::InvalidRequestUri
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"invalid_request_object\"").unwrap(),
            ClientErrorCode::InvalidRequestObject
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"request_not_supported\"").unwrap(),
            ClientErrorCode::RequestNotSupported
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"request_uri_not_supported\"").unwrap(),
            ClientErrorCode::RequestUriNotSupported
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"registration_not_supported\"").unwrap(),
            ClientErrorCode::RegistrationNotSupported
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"invalid_redirect_uri\"").unwrap(),
            ClientErrorCode::InvalidRedirectUri
        );
        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"invalid_client_metadata\"").unwrap(),
            ClientErrorCode::InvalidClientMetadata
        );

        assert_eq!(
            serde_json::from_str::<ClientErrorCode>("\"unknown_error_code\"").unwrap(),
            ClientErrorCode::Unknown("unknown_error_code".to_owned())
        );
    }
}