# Functions
NewParser 创建上传凭证签发器.
NewPutPolicy 为指定的空间生成上传策略.
NewPutPolicyWithKey 为指定的空间和对象名称生成上传策略.
NewPutPolicyWithKeyPrefix 为指定的空间和对象前缀生成上传策略.
NewSigner 创建上传凭证签发器
需要注意的是 NewSigner 仅仅只会通过 credentials.CredentialsProvider 获取一次鉴权参数，之后就会缓存该鉴权参数，不会反复获取.
# Variables
ErrEmptyBucketName 空的 Bucket 名称.
ErrInvalidPolicyValue 非法凭证值.
ErrInvalidUpToken 非法的上传凭证.
# Structs
FieldError indicates an error condition occurred while setting put policy.
# Interfaces
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# Type aliases
PutPolicy 存储上传策略.