public virtual async ValueTask <AccessToken> AuthenticateAsync(bool async, TokenRequestContext context, CancellationToken cancellationToken)
{
ManagedIdentitySource identitySource = await GetManagedIdentitySourceAsync(async, cancellationToken).ConfigureAwait(false);
// if msi is unavailable or we were unable to determine the type return CredentialUnavailable exception that no endpoint was found
if (identitySource == default)
{
throw new CredentialUnavailableException(MsiUnavailableError);
}
return(await identitySource.AuthenticateAsync(async, context, cancellationToken).ConfigureAwait(false));
}
private protected virtual async ValueTask <ManagedIdentitySource> GetManagedIdentitySourceAsync(bool async, CancellationToken cancellationToken)
{
using var asyncLock = await _identitySourceAsyncLock.GetLockOrValueAsync(async, cancellationToken).ConfigureAwait(false);
if (asyncLock.HasValue)
{
return(asyncLock.Value);
}
ManagedIdentitySource identitySource = AppServiceV2017ManagedIdentitySource.TryCreate(_options) ??
CloudShellManagedIdentitySource.TryCreate(_options) ??
AzureArcManagedIdentitySource.TryCreate(_options) ??
ServiceFabricManagedIdentitySource.TryCreate(_options) ??
await ImdsManagedIdentitySource.TryCreateAsync(_options, async, cancellationToken).ConfigureAwait(false);
asyncLock.SetValue(identitySource);
return(identitySource);
}