# Packages
qbox 包提供了该SDK需要的相关鉴权方法.
# Functions
CredentialsFromContext 从context获取密钥信息.
Default 构建默认的 Credentials 对象.
New 构建一个Credentials对象.
WithCredentials 返回一个包含密钥信息的context.
WithCredentialsType 返回一个context, 保存了密钥信息和token类型.
# Constants
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# Structs
七牛鉴权类，用于生成Qbox, Qiniu, Upload签名
AK/SK可以从 https://portal.qiniu.com/user/key 获取.
# Type aliases
七牛签名算法的类型： QBoxToken, QiniuToken, BearToken, QiniuMacToken.