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

## RequestedExpiryValidator Class

Validates the requested expiry time for a backchannel authentication request\.
Ensures that the requested expiry is within the allowed range and assigns a valid expiry time to the context\.

```csharp
public class RequestedExpiryValidator : Abblix.Oidc.Server.Endpoints.BackChannelAuthentication.Validation.IBackChannelAuthenticationContextValidator
```

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

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

## RequestedExpiryValidator\(IOptionsMonitor\<OidcOptions\>\) Constructor {#Abblix.Oidc.Server.Endpoints.BackChannelAuthentication.Validation.RequestedExpiryValidator.RequestedExpiryValidator(Microsoft.Extensions.Options.IOptionsMonitor_Abblix.Oidc.Server.Common.Configuration.OidcOptions_)}

Validates the requested expiry time for a backchannel authentication request\.
Ensures that the requested expiry is within the allowed range and assigns a valid expiry time to the context\.

```csharp
public RequestedExpiryValidator(Microsoft.Extensions.Options.IOptionsMonitor<Abblix.Oidc.Server.Common.Configuration.OidcOptions> options);
```
#### Parameters

###### `options` [Microsoft\.Extensions\.Options\.IOptionsMonitor&lt;](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.options.ioptionsmonitor-1 'Microsoft\.Extensions\.Options\.IOptionsMonitor\`1')[OidcOptions](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Common.Configuration.OidcOptions 'Abblix\.Oidc\.Server\.Common\.Configuration\.OidcOptions')[&gt;](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.options.ioptionsmonitor-1 'Microsoft\.Extensions\.Options\.IOptionsMonitor\`1') {#Abblix.Oidc.Server.Endpoints.BackChannelAuthentication.Validation.RequestedExpiryValidator.RequestedExpiryValidator(Microsoft.Extensions.Options.IOptionsMonitor_Abblix.Oidc.Server.Common.Configuration.OidcOptions_).options}

The options containing the default and maximum expiry settings for backchannel authentication\.
### Methods

## RequestedExpiryValidator\.ValidateAsync\(BackChannelAuthenticationValidationContext\) Method {#Abblix.Oidc.Server.Endpoints.BackChannelAuthentication.Validation.RequestedExpiryValidator.ValidateAsync(Abblix.Oidc.Server.Endpoints.BackChannelAuthentication.Validation.BackChannelAuthenticationValidationContext)}

Asynchronously validates the expiry time for the backchannel authentication request\.
Ensures that the requested expiry is within the allowed range and assigns an appropriate expiry to the context\.

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

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

The validation context containing the backchannel authentication request and its parameters\.

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

#### 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/en/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')  
A task representing the asynchronous operation, returning an error if validation fails,
            or null if validation succeeds\.