#### [Abblix\.Oidc\.Server](https://www.abblix.com/en/docs/api/abblix-oidc-server 'index')
### [Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Validation](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Authorization.Validation 'Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Validation')

## NonceValidator Class

Implements nonce validation for authorization requests in compliance with OAuth 2\.0 and OpenID Connect specifications\.
This validator ensures the presence of a nonce parameter when the response type includes an ID token, as by
OpenID Connect Core 1\.0 specification\. It extends [SyncAuthorizationContextValidatorBase](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Authorization.Validation.SyncAuthorizationContextValidatorBase 'Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Validation\.SyncAuthorizationContextValidatorBase') for
synchronous validation\.
Refer to RFC 6749 and OpenID Connect Core 1\.0 for more details on authorization request parameters\.

```csharp
public class NonceValidator : Abblix.Oidc.Server.Endpoints.Authorization.Validation.IAuthorizationContextValidator
```

Inheritance [System\.Object](https://learn.microsoft.com/en-us/dotnet/api/system.object 'System\.Object') → NonceValidator

Implements [IAuthorizationContextValidator](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Authorization.Validation.IAuthorizationContextValidator 'Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Validation\.IAuthorizationContextValidator')
### Constructors

## NonceValidator\(IAuthorizationValueReuseDetector\) Constructor {#Abblix.Oidc.Server.Endpoints.Authorization.Validation.NonceValidator.NonceValidator(Abblix.Oidc.Server.Features.ReusePrevention.IAuthorizationValueReuseDetector)}

Implements nonce validation for authorization requests in compliance with OAuth 2\.0 and OpenID Connect specifications\.
This validator ensures the presence of a nonce parameter when the response type includes an ID token, as by
OpenID Connect Core 1\.0 specification\. It extends [SyncAuthorizationContextValidatorBase](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Authorization.Validation.SyncAuthorizationContextValidatorBase 'Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Validation\.SyncAuthorizationContextValidatorBase') for
synchronous validation\.
Refer to RFC 6749 and OpenID Connect Core 1\.0 for more details on authorization request parameters\.

```csharp
public NonceValidator(Abblix.Oidc.Server.Features.ReusePrevention.IAuthorizationValueReuseDetector reuseDetector);
```
#### Parameters

###### `reuseDetector` [IAuthorizationValueReuseDetector](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.ReusePrevention.IAuthorizationValueReuseDetector 'Abblix\.Oidc\.Server\.Features\.ReusePrevention\.IAuthorizationValueReuseDetector') {#Abblix.Oidc.Server.Endpoints.Authorization.Validation.NonceValidator.NonceValidator(Abblix.Oidc.Server.Features.ReusePrevention.IAuthorizationValueReuseDetector).reuseDetector}
### Methods

## NonceValidator\.ValidateAsync\(AuthorizationValidationContext\) Method {#Abblix.Oidc.Server.Endpoints.Authorization.Validation.NonceValidator.ValidateAsync(Abblix.Oidc.Server.Endpoints.Authorization.Validation.AuthorizationValidationContext)}

Validates the nonce in the authorization request as per OpenID Connect Core 1\.0 specifications\.

```csharp
public System.Threading.Tasks.Task<Abblix.Oidc.Server.Endpoints.Authorization.Interfaces.AuthorizationRequestValidationError?> ValidateAsync(Abblix.Oidc.Server.Endpoints.Authorization.Validation.AuthorizationValidationContext context);
```
#### Parameters

###### `context` [AuthorizationValidationContext](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Authorization.Validation.AuthorizationValidationContext 'Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Validation\.AuthorizationValidationContext') {#Abblix.Oidc.Server.Endpoints.Authorization.Validation.NonceValidator.ValidateAsync(Abblix.Oidc.Server.Endpoints.Authorization.Validation.AuthorizationValidationContext).context}

The [AuthorizationValidationContext](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Authorization.Validation.AuthorizationValidationContext 'Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Validation\.AuthorizationValidationContext') containing the authorization request
            to be validated\.

Implements [ValidateAsync\(AuthorizationValidationContext\)](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Authorization.Validation.IAuthorizationContextValidator#Abblix.Oidc.Server.Endpoints.Authorization.Validation.IAuthorizationContextValidator.ValidateAsync(Abblix.Oidc.Server.Endpoints.Authorization.Validation.AuthorizationValidationContext) 'Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Validation\.IAuthorizationContextValidator\.ValidateAsync\(Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Validation\.AuthorizationValidationContext\)')

#### Returns
[System\.Threading\.Tasks\.Task&lt;](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1 'System\.Threading\.Tasks\.Task\`1')[AuthorizationRequestValidationError](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Authorization.Interfaces.AuthorizationRequestValidationError 'Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Interfaces\.AuthorizationRequestValidationError')[&gt;](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1 'System\.Threading\.Tasks\.Task\`1')  
An [AuthorizationRequestValidationError](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Authorization.Interfaces.AuthorizationRequestValidationError 'Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Interfaces\.AuthorizationRequestValidationError') if the validation fails due to a missing nonce
when the response type includes an ID token, as by OpenID Connect Core 1\.0;
otherwise, null indicating successful validation\.