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

## IdTokenHintValidator Class

Validates the `id_token_hint` parameter \(OpenID Connect RP\-Initiated Logout 1\.0 §2\):
verifies signature/issuer/audience but deliberately accepts expired tokens \(since the
hint's role is to identify a no\-longer\-active session\), then either populates
`ClientId` from the token's audience when the request omitted it, or asserts that
an explicitly supplied `client_id` matches that audience\.

```csharp
public class IdTokenHintValidator : Abblix.Oidc.Server.Endpoints.EndSession.Validation.IEndSessionContextValidator
```

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

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

## IdTokenHintValidator\(IIdTokenHintParser, IClientInfoProvider\) Constructor {#Abblix.Oidc.Server.Endpoints.EndSession.Validation.IdTokenHintValidator.IdTokenHintValidator(Abblix.Oidc.Server.Features.Tokens.Validation.IIdTokenHintParser,Abblix.Oidc.Server.Features.ClientInformation.IClientInfoProvider)}

Validates the `id_token_hint` parameter \(OpenID Connect RP\-Initiated Logout 1\.0 §2\):
verifies signature/issuer/audience but deliberately accepts expired tokens \(since the
hint's role is to identify a no\-longer\-active session\), then either populates
`ClientId` from the token's audience when the request omitted it, or asserts that
an explicitly supplied `client_id` matches that audience\.

```csharp
public IdTokenHintValidator(Abblix.Oidc.Server.Features.Tokens.Validation.IIdTokenHintParser hintParser, Abblix.Oidc.Server.Features.ClientInformation.IClientInfoProvider clientInfoProvider);
```
#### Parameters

###### `hintParser` [IIdTokenHintParser](https://www.abblix.com/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.Tokens.Validation.IIdTokenHintParser 'Abblix\.Oidc\.Server\.Features\.Tokens\.Validation\.IIdTokenHintParser') {#Abblix.Oidc.Server.Endpoints.EndSession.Validation.IdTokenHintValidator.IdTokenHintValidator(Abblix.Oidc.Server.Features.Tokens.Validation.IIdTokenHintParser,Abblix.Oidc.Server.Features.ClientInformation.IClientInfoProvider).hintParser}

###### `clientInfoProvider` [IClientInfoProvider](https://www.abblix.com/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.ClientInformation.IClientInfoProvider 'Abblix\.Oidc\.Server\.Features\.ClientInformation\.IClientInfoProvider') {#Abblix.Oidc.Server.Endpoints.EndSession.Validation.IdTokenHintValidator.IdTokenHintValidator(Abblix.Oidc.Server.Features.Tokens.Validation.IIdTokenHintParser,Abblix.Oidc.Server.Features.ClientInformation.IClientInfoProvider).clientInfoProvider}
### Methods

## IdTokenHintValidator\.ValidateAsync\(EndSessionValidationContext\) Method {#Abblix.Oidc.Server.Endpoints.EndSession.Validation.IdTokenHintValidator.ValidateAsync(Abblix.Oidc.Server.Endpoints.EndSession.Validation.EndSessionValidationContext)}

Performs this validator's check against the shared context\.

```csharp
public System.Threading.Tasks.Task<Abblix.Oidc.Server.Common.OidcError?> ValidateAsync(Abblix.Oidc.Server.Endpoints.EndSession.Validation.EndSessionValidationContext context);
```
#### Parameters

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

Mutable validation context shared with subsequent steps; this validator may
populate fields \(such as resolved `ClientInfo` or parsed `id_token_hint`\)\.

Implements [ValidateAsync\(EndSessionValidationContext\)](https://www.abblix.com/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.EndSession.Validation.IEndSessionContextValidator#Abblix.Oidc.Server.Endpoints.EndSession.Validation.IEndSessionContextValidator.ValidateAsync(Abblix.Oidc.Server.Endpoints.EndSession.Validation.EndSessionValidationContext) 'Abblix\.Oidc\.Server\.Endpoints\.EndSession\.Validation\.IEndSessionContextValidator\.ValidateAsync\(Abblix\.Oidc\.Server\.Endpoints\.EndSession\.Validation\.EndSessionValidationContext\)')

#### Returns
[System\.Threading\.Tasks\.Task&lt;](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1 'System\.Threading\.Tasks\.Task\`1')[OidcError](https://www.abblix.com/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Common.OidcError 'Abblix\.Oidc\.Server\.Common\.OidcError')[&gt;](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1 'System\.Threading\.Tasks\.Task\`1')  
`null` if the request passes this step, otherwise the error to surface\.