python3.6 通过调用 阿里云 API (非SDK方式) 查询 可用区 例子

Posted 2021-01-06

#!/usr/bin/env python3.5
# -*- coding:utf8 -*-
try:
    import httplib
except ImportError:
    import http.client as httplib
import sys, datetime
import urllib
import urllib.request
import urllib.error
import urllib.parse
import time
import json
import base64
import hmac, ssl
import uuid
from hashlib import sha1

# 解决 访问ssl网站证书的问题

try:
    _create_unverified_https_context = ssl._create_unverified_context
except AttributeError:
    # Legacy Python that doesn‘t verify HTTPS certificates by default
    pass
else:
    # Handle target environment that doesn‘t support HTTPS verification
    ssl._create_default_https_context = _create_unverified_https_context

class AliyunClient(object):
    def __init__(self, access_id, access_secret, region,url):
        self.access_id = access_id
        self.access_secret = access_secret
        self.RegionId = region
        self.url = url

    # #签名

    def sign(self, accessKeySecret, parameters):
        sortedParameters = sorted(parameters.items(), key=lambda parameters: parameters[0])
        canonicalizedQueryString = ‘‘
        for (k, v) in sortedParameters:
            canonicalizedQueryString += ‘&‘ + self.percent_encode(k) + ‘=‘ + self.percent_encode(v)
        stringToSign = ‘GET&%2F&‘ + self.percent_encode(canonicalizedQueryString[1:])  # 使用get请求方法
        bs = accessKeySecret + ‘&‘
        bs = bytes(bs, encoding=‘utf8‘)
        stringToSign = bytes(stringToSign, encoding=‘utf8‘)
        h = hmac.new(bs, stringToSign, sha1)
        # 进行编码
        signature = base64.b64encode(h.digest()).strip()
        return signature

    def percent_encode(self, encodeStr):
        encodeStr = str(encodeStr)
        res = urllib.request.quote(encodeStr)
        res = res.replace(‘+‘, ‘%20‘)
        res = res.replace(‘*‘, ‘%2A‘)
        res = res.replace(‘%7E‘, ‘~‘)
        return res

    # 构建除共公参数外的所有URL

    def make_url(self, params):
        timestamp = time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())
        parameters = {
            ‘Format‘: ‘JSON‘,
            ‘Version‘: ‘2014-05-26‘,
            ‘AccessKeyId‘: self.access_id,
            ‘SignatureVersion‘: ‘1.0‘,
            ‘SignatureMethod‘: ‘HMAC-SHA1‘,
            ‘SignatureNonce‘: str(uuid.uuid1()),
            ‘TimeStamp‘: timestamp,
        }
        for key in params.keys():
            parameters[key] = params[key]
        signature = self.sign(self.access_secret, parameters)
        parameters[‘Signature‘] = signature
        url = self.url + "/?" + urllib.parse.urlencode(parameters)
        return url

    def do_action(self, params):
        url = self.make_url(params)
        request = urllib.request.Request(url)
        try:
            conn = urllib.request.urlopen(request)
            response = conn.read().decode()
        except urllib.error.HTTPError as e:
            print(e.read().strip())
            raise SystemExit(e)
        try:
            res = json.loads(response)
        except ValueError as e:
            raise SystemExit(e)
        return res

# 继承原始类
class client(AliyunClient):
    def __init__(self,access_id,access_secret,region,url):
        AliyunClient.__init__(self,access_id,access_secret,region,url)

    def timestrip(self):
        UTCC = datetime.datetime.utcnow()
        utcbefore5 = UTCC - datetime.timedelta(minutes=5)
        Endtime = datetime.datetime.strftime(UTCC, "%Y-%m-%dT%H:%M:%SZ")
        StartTime = datetime.datetime.strftime(utcbefore5, "%Y-%m-%dT%H:%M:%SZ")
        return (StartTime, Endtime)

    def DescribeInstance(self):
        self.tt = self.timestrip()
        action_dict = {"Action": "DescribeAvailableResource", "RegionId": self.RegionId, ‘DestinationResource‘: ‘Zone‘}
        result = self.do_action(action_dict)
        return result

if __name__ == "__main__":
    a = client(‘xxxxxxxxx‘, ‘xxxxxxxxxxxxxxxxxxxxxxxxxxxxx‘,‘cn-beijing‘,‘https://ecs.aliyuncs.com‘)
    b = a.DescribeInstance()
    print(b)

结果

{‘RequestId‘: ‘264CD6C2-BA6F-4AC2-B07C-EDEF173E470F‘, ‘AvailableZones‘: {‘AvailableZone‘: [{‘Status‘: ‘Available‘, ‘RegionId‘: ‘cn-beijing‘, ‘ZoneId‘: ‘cn-beijing-f‘}, {‘Status‘: ‘Available‘, ‘RegionId‘: ‘cn-beijing‘, ‘ZoneId‘: ‘cn-beijing-c‘}, {‘Status‘: ‘Available‘, ‘RegionId‘: ‘cn-beijing‘, ‘ZoneId‘: ‘cn-beijing-e‘}, {‘Status‘: ‘Available‘, ‘RegionId‘: ‘cn-beijing‘, ‘ZoneId‘: ‘cn-beijing-d‘}, {‘Status‘: ‘Available‘, ‘RegionId‘: ‘cn-beijing‘, ‘ZoneId‘: ‘cn-beijing-a‘}, {‘Status‘: ‘Available‘, ‘RegionId‘: ‘cn-beijing‘, ‘ZoneId‘: ‘cn-beijing-b‘}, {‘Status‘: ‘Available‘, ‘RegionId‘: ‘cn-beijing‘, ‘ZoneId‘: ‘cn-beijing-g‘}]}}

参考:
https://www.cnblogs.com/IPYQ/p/5996868.html