OSSPostObject的Policy签名（Python和C）示例

研究了一下OSS的Policy如何签名
以下是Python的Sample代码



#coding=utf8
import md5
import hashlib
import base64
import hmac


def convert_base64(input):
    return base64.b64encode(input)


def get_sign_policy(key, policy):
    return base64.b64encode(hmac.new(key, policy, hashlib.sha1).digest())


policy='''
{"expiration":"2015-01-27T10:56:19Z","conditions":[["content-length-range", 0, 1048576]]}
'''
policy="{\"expiration\":\"2015-01-27T10:56:19Z\",\"conditions\":[[\"content-length-range\", 0, 1048576]]}"


print "policy: ", policy
print "policy length: ", len(policy)


secret_access_key = "test"
print "secret_access_key: ", secret_access_key


base64policy = convert_base64(policy)
print "base64policy: ", base64policy
signature = get_sign_policy(secret_access_key, base64policy)
print "signature_of_policy: ", signature








运行的结果：

policy:  {"expiration":"2015-01-27T10:56:19Z","conditions":[["content-length-range", 0, 1048576]]}
policy length:  89
secret_access_key:  test
base64policy:  eyJleHBpcmF0aW9uIjoiMjAxNS0wMS0yN1QxMDo1NjoxOVoiLCJjb25kaXRpb25zIjpbWyJjb250ZW50LWxlbmd0aC1yYW5nZSIsIDAsIDEwNDg1NzZdXX0=
signature_of_policy:  XRiWSZLSQPQGG+f3GPYLYMeFjr0=