/// <summary>
/// 获取微信API访问凭证。仅在需要时调用微信API接口，即：若凭证尚在有效期内，则直接取回上一次得到的凭证。
/// </summary>
/// <param name="appId"></param>
/// <param name="appSecret"></param>
/// <param name="forceRenew">强制立即取新。这将废弃并替换旧的，而不管是否旧的令牌是否过期。</param>
/// <returns>微信API访问凭证</returns>
public string GetToken(string appId, string appSecret, bool forceRenew = false)
{
//bool forceRenew = false;
if (forceRenew)
{
//立即过期
_AccessTokenBags.SetExpired(appId);
}
else
{
forceRenew = _AccessTokenBags.IsExpired(appId);
}
//forceRenew = CheckTokenExpire();
if (forceRenew)
{
lock (_lockApiCalling)
{
//再次检查，通常在等待上一锁释放期间，过期状态已经发生改变。若已改变，则不应再调用API去刷新Token！
if (_AccessTokenBags.IsExpired(appId))
{
AccessTokenJson json = AccessTokenApi.GetTokenAsync(appId, appSecret).Result;
if (json != null &&
!string.IsNullOrEmpty(json.access_token))
{
_AccessTokenBags.Store(appId, new AccessTokenBag()
{
AccessTokenJson = json,
AppId = appId,
AppSecret = appSecret,
CreateTime = DateTime.Now
});
}
}
}
}
return(_AccessTokenBags.GetToken(appId));
}
public string GetToken(bool forceRenew)
{
var appId = _options.AppId;
var appSecret = _options.AppSecret;
var cacheKey = GenerateCacheKey(appId);
if (!forceRenew)
{
if (_cache.TryGetValue(cacheKey, out string accessToken))
{
return accessToken;
}
}
else
{
_cache.Remove(cacheKey);
}
try
{
var json = AccessTokenApi.GetTokenAsync(appId, appSecret).Result;
if (json == null
|| string.IsNullOrWhiteSpace(json.access_token)
|| json.expires_in < 1
|| json.expires_in > 7200)
{
throw WeixinAccessTokenError.UnknownResponse();
}
else
{
var newAccessToken = json.access_token;
_cache.Set(cacheKey, newAccessToken, TimeSpan.FromSeconds(json.expires_in));
return newAccessToken;
}
}
catch (Exception ex)
{
throw WeixinAccessTokenError.GenericError(ex);
}
}