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added check access token validity before refresh #309

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added check access token validity before refresh #309

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4 changes: 3 additions & 1 deletion identity-model-oidc-client/src/IdentityModel.OidcClient/RefreshTokenDelegatingHandler.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ public class RefreshTokenDelegatingHandler : DelegatingHandler
private string _accessToken;
private string _accessTokenType;
private string _refreshToken;
private DateTime? _validUntil;

private bool _disposed;

Expand Down Expand Up @@ -120,7 +121,7 @@ public RefreshTokenDelegatingHandler(OidcClient oidcClient, string accessToken,
protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
var accessToken = await GetAccessTokenAsync(cancellationToken);
if (accessToken.IsMissing())
if (accessToken.IsMissing() || (_validUntil.HasValue && _validUntil.Value < DateTime.Now))
{
if (await RefreshTokensAsync(cancellationToken) == false)
{
Expand Down Expand Up @@ -182,6 +183,7 @@ private async Task<bool> RefreshTokensAsync(CancellationToken cancellationToken)
if (!response.IsError)
{
_accessToken = response.AccessToken;
_validUntil = DateTime.Now.AddSeconds(response.ExpiresIn);
if (!response.RefreshToken.IsMissing())
{
_refreshToken = response.RefreshToken;
Expand Down