def generate_url(self, method, bucket, key, path_args, headers):
expires = long(0)
if self.expiresin:
expires = long(round(time.time() * 1000)) + long(self.expiresin) #time.time()*1000获取当前时间的毫秒数
elif self.expires:
expires = long(self.expires)
else:
raise Exception("Illegal expires state")
#单位转换为秒
expires /= 1000
canonical_string = Utils.make_canonicalstring(method, bucket, key, path_args, headers, str(expires))
encoded_canonical = Utils.encode(self.secret_access_key, canonical_string, True)
path_args = path_args if path_args else {}
path_args["Signature"] = encoded_canonical
path_args["Expires"] = str(expires) #将long型转换为string型
path_args["AWSAccessKeyId"] = self.access_key_id
calling_format = Utils.get_callingformat_for_bucket(self.calling_format, bucket)
if self.is_secure and not isinstance(calling_format, PathFormat) and bucket.find( "." ) != -1:
raise Exception("You are making an SSL connection, however, the bucket contains periods and \
the wildcard certificate will not match by default. Please consider using HTTP.")
#需要进行异常检查
try:
return_string = calling_format.get_full_url(self.is_secure, self.server, self.port, bucket, key, path_args)
except Exception as e:
return_string = "Exception generating url " + e.strerror
return return_string
