# Functions
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endPoint, accessKeyID, accessKeySecret, bucketName string, clientCacheTime 为基础配置 callbackUrl uploadDir tokenExpireTime为客户端上传时的配置，callbackUrl为上传到oss的回调地址，uploadDir为上传的目录，tokenExpireTime为临时token的过期时间.
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功能：生成NewDataBox对象，以便向data(必须是slice)中的成员(slice中的成员)添加指定数据，数据由FetchObjsByKeysRetMapFunc或者 FetchObjsByKeysRetSliceFunc返回slice中的对象和map中的value可以是结构或者是结构的指针 keyFieldName指明后续获取数据的key，后续会收集所有的key，传到FetchObjs...函数，以便集中化获取数据，提升效率 通过SaveToField函数指明的fieldname，得到数据填充的位置 其它特点： 1.
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PKCS7UnPadding return unpadding []Byte plantText.
gen random string.
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客户端直传后，OSS的回调函数中调用该函数进行参数验证。这里都把返回值写入了http.ResponseWriter中.
# Constants
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# Structs
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WxBizDataCrypt represents an active WxBizDataCrypt object.
# Type aliases
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用户需要实现的函数：通过key列表来获取对象，用于JoinByMap key列表时data里面通过keyfield抽取的key列表 第一个返回的map的key为传入的key；map里面的value可以是查到的单个对象，也可以是一个可以对应的对象slice 与FetchObjsByKeysRetSliceFunc相比，性能更高，且子结构可以不带父对象的ID，缺点是需要多写点代码.
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