public async Task <string> GetAccessToken()
{
string key = "WeChatAccessToken";
var accessTokenResultStr = await this.GetFromCacheServer(key);
WeChatAccessToken accessTokenResult = null;
Action <JObject> callback = jObject =>
{
var expiresAt = DateTime.Now.AddHours(1.5);
accessTokenResult = new WeChatAccessToken
{
AccessToken = jObject.GetValue("access_token").Value <string>(),
ExpiresIn = jObject.GetValue("expires_in").Value <int>(),
ExpiresAt = expiresAt
};
this.PostDataToCacheServer(key, accessTokenResult);
};
if (!string.IsNullOrEmpty(accessTokenResultStr))
{
accessTokenResult = JsonConvert.DeserializeObject <WeChatAccessToken>(accessTokenResultStr);
}
else
{
await this.GetFromWechatServer(_weChatApiUrls.GetAcessTokenUrl(), callback);
}
return(accessTokenResult?.AccessToken);
}
private Task PostDataToCacheServer(string key, WeChatAccessToken value)
{
var cacheObj = new {
Key = key,
Value = JsonConvert.SerializeObject(value),
Options = new
{
AbsoluteExpirationRelativeToNow = value.ExpiresAt.TimeOfDay
}
};
return(client.PostAsJsonAsync(_url, cacheObj));
}