鉴权代码示例 - CDN

本文以Python Demo为您示例，介绍三种鉴权方式的实现方法。

代码示例

鉴权方式说明，请参见：

代码示例如下所示。

说明

Python有Python2和Python3两个主要的版本，由于Python3不完全向下兼容Python2，因此下面分别给出了Python2和Python3的代码示例。
如果URL中包含中文字符，请先对URL中的中文字符进行UrlEncode编码，然后再运行代码实现鉴权处理。
由于Python2使用的是ASCII编码，而Python3使用的是UTF-8编码，hash传递时需要使用UTF-8类型，因此，Python3代码示例的md5 hash环节增加了编码转换处理。

Python3

import re
import time
import hashlib
import datetime
def md5sum(src):
    m = hashlib.md5()
    m.update(src.encode(encoding='utf-8'))                                    #增加了编码方式转换处理
    return m.hexdigest()
    #鉴权方式A
def a_auth(uri, key, exp):
    p = re.compile("^(http://|https://)?([^/?]+)(/[^?]*)?(\\?.*)?$")
    if not p:
        return None
    m = p.match(uri)
    scheme, host, path, args = m.groups()
    if not scheme: scheme = "http://"
    if not path: path = "/"
    if not args: args = ""
    rand = "0"      # "0" by default, other value is ok
    uid = "0"       # "0" by default, other value is ok
    sstring = "%s-%s-%s-%s-%s" %(path, exp, rand, uid, key)
    hashvalue = md5sum(sstring)
    auth_key = "%s-%s-%s-%s" %(exp, rand, uid, hashvalue)
    if args:
        return "%s%s%s%s&auth_key=%s" %(scheme, host, path, args, auth_key)
    else:
        return "%s%s%s%s?auth_key=%s" %(scheme, host, path, args, auth_key)
    #鉴权方式B
def b_auth(uri, key, exp):
    p = re.compile("^(http://|https://)?([^/?]+)(/[^?]*)?(\\?.*)?$")
    if not p:
        return None
    m = p.match(uri)
    scheme, host, path, args = m.groups()
    if not scheme: scheme = "http://"
    if not path: path = "/"
    if not args: args = ""
    # convert unix timestamp to "YYmmDDHHMM" format
    nexp = datetime.datetime.fromtimestamp(exp).strftime('%Y%m%d%H%M')
    sstring = key + nexp + path
    hashvalue = md5sum(sstring)
    return "%s%s/%s/%s%s%s" %(scheme, host, nexp, hashvalue, path, args)
    #鉴权方式C
def c_auth(uri, key, exp):
    p = re.compile("^(http://|https://)?([^/?]+)(/[^?]*)?(\\?.*)?$")
    if not p:
        return None
    m = p.match(uri)
    scheme, host, path, args = m.groups()
    if not scheme: scheme = "http://"
    if not path: path = "/"
    if not args: args = ""
    hexexp = "%x" %exp
    sstring = key + path + hexexp
    hashvalue = md5sum(sstring)
    return "%s%s/%s/%s%s%s" %(scheme, host, hashvalue, hexexp, path, args)
    #以下内容为uri、key、exp这三个参数的取值代码
def main():
    uri = "http://example.aliyundoc.com/ping?foo=bar"            # original uri
    key = "<input private key>"                         # private key of authorization
    exp = int(time.time()) + 1 * 3600                   # expiration time: 1 hour after current time
    #“1 * 3600”定义了签算服务器配置的鉴权URL的有效时长，用户可以任意配置，单位是秒。签算服务器配置的鉴权URL有效时长和CDN配置的鉴权URL有效时长没有对应关系。
    #鉴权URL的实际过期时间=签算服务器的Unix时间戳+签算服务器配置的鉴权URL有效时长+CDN配置的鉴权URL有效时长
    #以调用鉴权方式A为例，签算服务器的Unix时间戳=1444435200，签算服务器配置的鉴权URL有效时长=3600，CDN配置的鉴权URL有效时长=1800，则鉴权URL的实际过期时间为1444435200+3600+1800=1444440600
    #以下内容是调用A鉴权算法的代码示例：
    authuri = a_auth(uri, key, exp)                     # auth type: a_auth / b_auth / c_auth
    print("URL : %s\nAUTH: %s" %(uri, authuri))
if __name__ == "__main__":
    main()

Python2

import re
import time
import hashlib
import datetime
def md5sum(src):
    m = hashlib.md5()
    m.update(src)
    return m.hexdigest()
    #鉴权方式A
def a_auth(uri, key, exp):
    p = re.compile("^(http://|https://)?([^/?]+)(/[^?]*)?(\\?.*)?$")
    if not p:
        return None
    m = p.match(uri)
    scheme, host, path, args = m.groups()
    if not scheme: scheme = "http://"
    if not path: path = "/"
    if not args: args = ""
    rand = "0"      # "0" by default, other value is ok
    uid = "0"       # "0" by default, other value is ok
    sstring = "%s-%s-%s-%s-%s" %(path, exp, rand, uid, key)
    hashvalue = md5sum(sstring)
    auth_key = "%s-%s-%s-%s" %(exp, rand, uid, hashvalue)
    if args:
        return "%s%s%s%s&auth_key=%s" %(scheme, host, path, args, auth_key)
    else:
        return "%s%s%s%s?auth_key=%s" %(scheme, host, path, args, auth_key)
    #鉴权方式B
def b_auth(uri, key, exp):
    p = re.compile("^(http://|https://)?([^/?]+)(/[^?]*)?(\\?.*)?$")
    if not p:
        return None
    m = p.match(uri)
    scheme, host, path, args = m.groups()
    if not scheme: scheme = "http://"
    if not path: path = "/"
    if not args: args = ""
    # convert unix timestamp to "YYmmDDHHMM" format
    nexp = datetime.datetime.fromtimestamp(exp).strftime('%Y%m%d%H%M')
    sstring = key + nexp + path
    hashvalue = md5sum(sstring)
    return "%s%s/%s/%s%s%s" %(scheme, host, nexp, hashvalue, path, args)
    #鉴权方式C
def c_auth(uri, key, exp):
    p = re.compile("^(http://|https://)?([^/?]+)(/[^?]*)?(\\?.*)?$")
    if not p:
        return None
    m = p.match(uri)
    scheme, host, path, args = m.groups()
    if not scheme: scheme = "http://"
    if not path: path = "/"
    if not args: args = ""
    hexexp = "%x" %exp
    sstring = key + path + hexexp
    hashvalue = md5sum(sstring)
    return "%s%s/%s/%s%s%s" %(scheme, host, hashvalue, hexexp, path, args)
    #以下内容为uri、key、exp这三个参数的取值代码
def main():
    uri = "http://example.aliyundoc.com/ping?foo=bar"            # original uri
    key = "<input private key>"                         # private key of authorization
    exp = int(time.time()) + 1 * 3600                   # expiration time: 1 hour after current time
    #“1 * 3600”定义了签算服务器配置的鉴权URL的有效时长，用户可以任意配置，单位是秒。签算服务器配置的鉴权URL有效时长和CDN配置的鉴权URL有效时长没有对应关系。
    #鉴权URL的实际过期时间=签算服务器的Unix时间戳+签算服务器配置的鉴权URL有效时长+CDN配置的鉴权URL有效时长
    #以调用鉴权方式A为例，签算服务器的Unix时间戳=1444435200，签算服务器配置的鉴权URL有效时长=3600，CDN配置的鉴权URL有效时长=1800，则鉴权URL的实际过期时间为1444435200+3600+1800=1444440600
    #以下内容是调用A鉴权算法的代码示例：
    authuri = a_auth(uri, key, exp)                     # auth type: a_auth / b_auth / c_auth
    print("URL : %s\nAUTH: %s" %(uri, authuri))
if __name__ == "__main__":
    main()