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我目前正在使用 AWS STS 访问 S3 资源。我第一次能够在 STS 凭证的帮助下使用 get 对象访问 S3 资源。15 分钟后，我使用 getAssumeRoleForUser 获得了新凭证。这次我是由于令牌过期异常，无法访问 S3 资源。以下是用于遵循上述过程的代码。

类 CustomIdentityProvider: NSObject, AWSCredentialsProvider{ var token:String! var awsAccessKey：字符串！var awsSecretKey：字符串！var awsExpiration: NSDate! var awsRegion：字符串！功能凭证（）-> AWSTask{

   let credentials = AWSCredentials(accessKey:self.awsAccessKey, 
     secretKey:self.awsSecretKey, sessionKey :self.token,
    expiration:self.awsExpiration as! Date)
       return AWSTask(result:credentials)
   }
   func invalidateCachedTemporaryCredentials() {
       print("cache clear")
   }
   init(accessKey: String, secretKey: String, sessionKey: String?, expiration: 
     NSDate?) {
      self.token = sessionKey
      self.awsAccessKey = accessKey
      self.awsSecretKey = secretKey
      self.awsExpiration =  expiration

} }

//Implementations
            let expirationTime   = m.expiration
            let dateFormatter = DateFormatter()
            dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"
            let date = dateFormatter.date(from: expirationTime )
            let  awsExpiration      =  date as NSDate?
       
       let customProviderManager = CustomIdentityProvider(accessKey:
       m.accessKeyId ?? "", secretKey: m.secretAccessKey ?? "", sessionKey:
       m.sessionToken ?? "", expiration: awsExpiration)
       let serviceConfig = AWSServiceConfiguration(region: AWSRegionType.APSouth1,
                                       credentialsProvider:  customProviderManager)
                   
       
       AWSServiceManager.default().defaultServiceConfiguration =
       serviceConfig

请让我知道处理此令牌过期问题需要什么。让我知道我这边是否还有其他设置或代码丢失。在 Android 中一切正常

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