aliyun_api.py——阿里雲API簽名

#!/usr/bin/env python

#coding: utf-8

import sys,os

import urllib,urllib2

import base64

import hmac

import hashlib

from hashlib import sha1

import time

import uuid

import json

access_key_id = '';

access_key_secret = '';

server_address = 'https://ecs.aliyuncs.com'

#定義參數

user_params = {'Action': 'DescribeInstanceMonitorData', 'InstanceId': 'i-280xh6jqg', 'StartTime': '2015-07-27T09:00:00Z', 'EndTime': '2015-07-27T10:00:00Z', 'Period': '600'}

def percent_encode(str):

    res = urllib.quote(str.decode(sys.stdin.encoding).encode('utf8'), '')

    res = res.replace('+', '%20')

    res = res.replace('*', '%2A')

    res = res.replace('%7E', '~')

    return res

def compute_signature(parameters, access_key_secret):

    sortedParameters = sorted(parameters.items(), key=lambda parameters: parameters[0])

    canonicalizedQueryString = ''

    for (k,v) in sortedParameters:

        canonicalizedQueryString += '&' + percent_encode(k) + '=' + percent_encode(v)

    stringToSign = 'GET&%2F&' + percent_encode(canonicalizedQueryString[1:])

    h = hmac.new(access_key_secret + "&", stringToSign, sha1)

    signature = base64.encodestring(h.digest()).strip()

    return signature

def compose_url(user_params):

    timestamp = time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())

    parameters = { \

            'Format'        : 'JSON', \

            'Version'       : '2014-05-26', \

            'AccessKeyId'   : access_key_id, \

            'SignatureVersion'  : '1.0', \

            'SignatureMethod'   : 'HMAC-SHA1', \

            'SignatureNonce'    : str(uuid.uuid1()), \

            'TimeStamp'         : timestamp, \

    }

    for key in user_params.keys():

        parameters[key] = user_params[key]

    signature = compute_signature(parameters, access_key_secret)

    parameters['Signature'] = signature

    url = server_address + "/?" + urllib.urlencode(parameters)

    return url

def make_request(user_params, quiet=False):

    url = compose_url(user_params)

    request = urllib2.Request(url)

    try:

        conn = urllib2.urlopen(request)

        response = conn.read()

    except urllib2.HTTPError, e:

        print(e.read().strip())

        raise SystemExit(e)

    try:

        obj = json.loads(response)

        if quiet:

            return obj

    except ValueError, e:

        raise SystemExit(e)

    json.dump(obj, sys.stdout, sort_keys=True, indent=2)

    sys.stdout.write('\n')

make_request(user_params)