def crc32(data):
"""计算输入流的crc32检验码:
Args:
data: 待计算校验码的字符流
Returns:
输入流的crc32校验码。
"""
return binascii.crc32(b(data)) & 0xffffffff
def urlsafe_base64_encode(data):
"""urlsafe的base64编码:
对提供的数据进行urlsafe的base64编码。规格参考：
https://developer.qiniu.com/kodo/manual/1231/appendix#1
Args:
data: 待编码的数据，一般为字符串
Returns:
编码后的字符串
"""
ret = urlsafe_b64encode(b(data))
return s(ret)
def etag_stream(input_stream):
"""计算输入流的etag:
etag规格参考 https://developer.qiniu.com/kodo/manual/1231/appendix#3
Args:
input_stream: 待计算etag的二进制流
Returns:
输入流的etag值
"""
array = [_sha1(block) for block in _file_iter(input_stream, _BLOCK_SIZE)]
if len(array) == 0:
array = [_sha1(b'')]
if len(array) == 1:
data = array[0]
prefix = b'\x16'
else:
sha1_str = b('').join(array)
data = _sha1(sha1_str)
prefix = b'\x96'
return urlsafe_base64_encode(prefix + data)
def __token(self, data):
data = b(data)
hashed = hmac.new(self.__secret_key, data, sha1)
return urlsafe_base64_encode(hashed.digest())
def __init__(self, access_key, secret_key):
"""初始化Auth类"""
self.__checkKey(access_key, secret_key)
self.__access_key = access_key
self.__secret_key = b(secret_key)
def __init__(self, access_key, secret_key):
self.qiniu_header_prefix = "X-Qiniu-"
self.__checkKey(access_key, secret_key)
self.__access_key = access_key
self.__secret_key = b(secret_key)