# -*- coding:utf-8 -*-
# AWS Version 4 signing example
# EC2 API (DescribeRegions)
# See: http://docs.aws.amazon.com/general/latest/gr/sigv4_signing.html
# This version makes a GET request and passes the signature
# in the Authorization header.
import sys, os, base64, datetime, hashlib, hmac
import requests # pip install requests
access_key = 'xxxxxxxxxxxxxxxxxxxxxxxx'
secret_key = 'SSSSSSSSSSSSSSSSSSSSSSSSSS'
if access_key is None or secret_key is None:
print ('No access key is available.')
sys.exit()
# ************* REQUEST VALUES *************
method = 'GET'
service = 'kec'
host = 'kec.cn-beijing-6.api.ksyun.com'
region = 'cn-beijing-6'
endpoint = 'https://kec.cn-beijing-6.api.ksyun.com'
request_parameters = 'Action=DescribeInstances&Version=2016-03-04' #查询主机
body = ''
# Key derivation functions. See:
# http://docs.aws.amazon.com/general/latest/gr/signature-v4-examples.html#signature-v4-examples-python
def sign(key, msg):
return hmac.new(key, msg.encode('utf-8'), hashlib.sha256).digest()
def getSignatureKey(key, dateStamp, regionName, serviceName):
kDate = sign(('AWS4' + key).encode('utf-8'), dateStamp)
kRegion = sign(kDate, regionName)
kService = sign(kRegion, serviceName)
kSigning = sign(kService, 'aws4_request')
return kSigning
# Read AWS access key from env. variables or configuration file. Best practice is NOT
# to embed credentials in code.
#access_key = os.environ.get('AWS_ACCESS_KEY_ID')
#secret_key = os.environ.get('AWS_SECRET_ACCESS_KEY')
# Create a date for headers and the credential string
t = datetime.datetime.utcnow()
amzdate = t.strftime('%Y%m%dT%H%M%SZ')
datestamp = t.strftime('%Y%m%d') # Date w/o time, used in credential scope
# ************* TASK 1: CREATE A CANONICAL REQUEST *************
# http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
# Step 1 is to define the verb (GET, POST, etc.)--already done.
# Step 2: Create canonical URI--the part of the URI from domain to query
# string (use '/' if no path)
canonical_uri = '/'
# Step 3: Create the canonical query string. In this example (a GET request),
# request parameters are in the query string. Query string values must
# be URL-encoded (space=%20). The parameters must be sorted by name.
# For this example, the query string is pre-formatted in the request_parameters variable.
canonical_querystring = request_parameters
# Step 4: Create the canonical headers and signed headers. Header names
# must be trimmed and lowercase, and sorted in code point order from
# low to high. Note that there is a trailing
.
canonical_headers = 'host:' + host + '
' + 'x-amz-date:' + amzdate + '
'
# Step 5: Create the list of signed headers. This lists the headers
# in the canonical_headers list, delimited with ";" and in alpha order.
# Note: The request can include any headers; canonical_headers and
# signed_headers lists those that you want to be included in the
# hash of the request. "Host" and "x-amz-date" are always required.
signed_headers = 'host;x-amz-date'
# Step 6: Create payload hash (hash of the request body content). For GET
# requests, the payload is an empty string ("").
payload_hash = hashlib.sha256(body.encode()).hexdigest()
#payload 指的是对body体的hash值
# Step 7: Combine elements to create canonical request
canonical_request = method + '
' + canonical_uri + '
' + canonical_querystring + '
' + canonical_headers + '
' + signed_headers + '
' + payload_hash
print(' 33[32;1m 创建一个规范化请求字符串,如下 33[0m')
print(canonical_request)
print(' 33[32;1m*****************签名字符串准备******************************************* 33[0m')
# ************* TASK 2: CREATE THE STRING TO SIGN*************
# Match the algorithm to the hashing algorithm you use, either SHA-1 or
# SHA-256 (recommended)
algorithm = 'AWS4-HMAC-SHA256'
credential_scope = datestamp + '/' + region + '/' + service + '/' + 'aws4_request'
print(' 33[32;1m 证书范围字符串,如下 33[0m')
print(credential_scope)
string_to_sign = algorithm + '
' + amzdate + '
' + credential_scope + '
' + hashlib.sha256(canonical_request.encode()).hexdigest()
print(' 33[32;1m用 签名算法 + 时间年月日 + (具体时间 region service + aws4_request 组成的证书范围) + 规范化请求字符串的哈希值 组合生成要签名的字符串如下 33[0m
', string_to_sign)
#
# ************* TASK 3: CALCULATE THE SIGNATURE *************
# Create the signing key using the function defined above.
signing_key = getSignatureKey(secret_key, datestamp, region, service)
print(' 33[32;1m使用 SK:%s 时间:%s region:%s service:%s 生成的签名键如下 33[0m' %(secret_key,datestamp,region,service))
print(signing_key)
# Sign the string_to_sign using the signing_key
print(' 33[32;1m 对字符串签名结果如下 33[0m')
signature = hmac.new(signing_key, (string_to_sign).encode('utf-8'), hashlib.sha256).hexdigest()
print(signature)
# ************* TASK 4: ADD SIGNING INFORMATION TO THE REQUEST *************
# The signing information can be either in a query string value or in
# a header named Authorization. This code shows how to use a header.
# Create authorization header and add to request headers
authorization_header = algorithm + ' ' + 'Credential=' + access_key + '/' + credential_scope + ', ' + 'SignedHeaders=' + signed_headers + ', ' + 'Signature=' + signature
print(' 33[32;1m 生成Authorization: 值如下 33[0m',authorization_header)
# The request can include any headers, but MUST include "host", "x-amz-date",
# and (for this scenario) "Authorization". "host" and "x-amz-date" must
# be included in the canonical_headers and signed_headers, as noted
# earlier. Order here is not significant.
# Python note: The 'host' header is added automatically by the Python 'requests' library.
headers = {'Content-Type':'application/json','X-Amz-Date':amzdate, 'Authorization':authorization_header}
#print amzdate
#print authorization_header
#
# ************* SEND THE REQUEST *************
request_url = endpoint + '?' + canonical_querystring
print('
###############开始请求##############')
print('Request URL = ' + request_url)
r = requests.get(request_url, headers=headers)
print('
######################RESPONSE#######################')
print('Response code: %d
' % r.status_code)
print(r.text)
#print r.connection,dir(r.connection)
#print dir(r)
