public async Task <string> ReadOrRetrieveAccessToken <ServiceAgentSettings>(ServiceAgentSettings settings) where ServiceAgentSettings : OAuthAgentSettingsBase
{
var cacheKey = $"{settings.OAuthClientId}{settings.OAuthClientSecret}{settings.OAuthScope}{settings.OAuthTokenEndpoint}";
var(succeeded, tokenReplyResult) = await _cacher.GetFromCacheAsync <TokenReply>(cacheKey).ConfigureAwait(false);
if (!succeeded || tokenReplyResult == null)
{
tokenReplyResult = await RetrieveTokenReply(settings.OAuthClientId, settings.OAuthClientSecret, settings.OAuthScope, settings.OAuthTokenEndpoint);
if (tokenReplyResult == null)
{
throw new Exception($"Unable to retrieve token reply for agent with key {cacheKey}");
}
int cacheExpiration = CalculateCacheExpiration(tokenReplyResult);
if (cacheExpiration > 0)
{
await _cacher.SaveToCacheAsync(cacheKey, tokenReplyResult);
}
}
return(tokenReplyResult.access_token);
}