创建亚马逊CloudFront的

Question

亚马逊签名饼干除了已签署的网址已推出Cloudfront signed cookie最近。

类似quesition已经约signed url。显然有对signed url in the cloudfront SDK

支持但是我无法找到在AWS蟒蛇SDK此功能的支持。

我怎样才能得到要创建签名的cookie？

Answer 1

我创建了一个博托功能要求增加这一点，但在此期间，我得到了它与我的Django的Python应用程序的工作。这里是我自己写的简单代码。底部是一个示例django视图方法，以便您了解如何为包含Cloudfront内容的网页设置Cookie。

import time 
from boto.cloudfront import CloudFrontConnection 
from boto.cloudfront.distribution import Distribution 
from config import settings 
import logging 
from django.template.context import RequestContext 
from django.shortcuts import render_to_response 
logger = logging.getLogger('boto') 
logger.setLevel(logging.CRITICAL) #disable DEBUG logging that's enabled in AWS by default (outside of django) 

AWS_ACCESS_KEY="AKABCDE1235ABCDEF22A"#SAMPLE 
AWS_SECRET_KEY="a1wd2sD1A/GS8qggkXK1u8kHlh+BiLp0C3nBJ2wW" #SAMPLE 
key_pair_id="APKABCDEF123ABCDEFAG" #SAMPLE 
DOWNLOAD_DIST_ID = "E1ABCDEF3ABCDE" #SAMPLE replace with the ID of your Cloudfront dist from Cloudfront console 

############################################ 
def generate_signed_cookies(resource,expire_minutes=5): 
    """ 
    @resource path to s3 object inside bucket(or a wildcard path,e.g. '/blah/*' or '*') 
    @expire_minutes  how many minutes before we expire these access credentials (within cookie) 
    return tuple of domain used in resource URL & dict of name=>value cookies 
    """ 
    if not resource: 
     resource = 'images/*' 
    dist_id = DOWNLOAD_DIST_ID 
    conn = CloudFrontConnection(AWS_ACCESS_KEY, AWS_SECRET_KEY) 
    dist = SignedCookiedCloudfrontDistribution(conn,dist_id) 
    return dist.create_signed_cookies(resource,expire_minutes=expire_minutes) 

############################################ 
class SignedCookiedCloudfrontDistribution(): 

    def __init__(self,connection,download_dist_id,cname=True): 
     """ 
     @download_dist_id id of your Cloudfront download distribution 
     @cname   boolean True to use first domain cname, False to use 
         cloudfront domain name, defaults to cname 
         which presumably matches your writeable cookies (.mydomain.com) 
     """ 
     self.download_dist = None 
     self.domain = None 
     try: 
      download_dist = connection.get_distribution_info(download_dist_id) 
      if cname and download_dist.config.cnames: 
       self.domain = download_dist.config.cnames[0] #use first cname if defined 
      else: 
       self.domain = download_dist.domain_name 
      self.download_dist = download_dist 
     except Exception, ex: 
      logging.error(ex) 

    def get_http_resource_url(self,resource=None,secure=False): 
     """ 
     @resource optional path and/or filename to the resource 
        (e.g. /mydir/somefile.txt); 
        defaults to wildcard if unset '*' 
     @secure  whether to use https or http protocol for Cloudfront URL - update 
        to match your distribution settings 
     return constructed URL 
     """ 
     if not resource: 
      resource = '*' 
     protocol = "http" if not secure else "https" 
     http_resource = '%s://%s/%s' % (protocol,self.domain,resource) 
     return http_resource 

    def create_signed_cookies(self,resource,expire_minutes=3): 
     """ 
     generate the Cloudfront download distirbution signed cookies 
     @resource path to the file, path, or wildcard pattern to generate policy for 
     @expire_minutes number of minutes until expiration 
     return  tuple with domain used within policy (so it matches 
        cookie domain), and dict of cloudfront cookies you 
        should set in request header 
     """ 
     http_resource = self.get_http_resource_url(resource,secure=False) #per-file access #NOTE secure should match security settings of cloudfront distribution 
    # http_resource = self.get_http_resource_url("somedir/*") #blanket access to all /somedir files inside my bucket 
    # http_resource = self.get_http_resource_url("*")   #blanket access to all files inside my bucket 

     #generate no-whitespace json policy, then base64 encode & make url safe 
     policy = Distribution._canned_policy(http_resource,SignedCookiedCloudfrontDistribution.get_expires(expire_minutes)) 
     encoded_policy = Distribution._url_base64_encode(policy) 

     #assemble the 3 Cloudfront cookies 
     signature = SignedCookiedCloudfrontDistribution.generate_signature(policy,private_key_file=settings.AMAZON_PRIV_KEY_FILE) 
     cookies = { 
      "CloudFront-Policy" :encoded_policy, 
      "CloudFront-Signature" :signature, 
      "CloudFront-Key-Pair-Id" :key_pair_id #e.g, APKA..... -> same value you use when you sign URLs with boto distribution.create_signed_url() function 
     } 
     return self.domain,cookies 

    @staticmethod 
    def get_expires(minutes): 
     unixTime = time.time() + (minutes * 60) 
     expires = int(unixTime) #if not converted to int causes Malformed Policy error and has 2 decimals in value 
     return expires 

    @staticmethod 
    def generate_signature(policy,private_key_file=None): 
     """ 
     @policy  no-whitespace json str (NOT encoded yet) 
     @private_key_file your .pem file with which to sign the policy 
     return encoded signature for use in cookie 
     """ 
     #sign the policy - code borrowed from Distribution._create_signing_params() 
     signature = Distribution._sign_string(policy, private_key_file) 
     #now base64 encode the signature & make URL safe 
     encoded_signature = Distribution._url_base64_encode(signature) 
     return encoded_signature 

############################################ 
def sample_django_view_method(request,template="mytemplate.html"): 
    expireLen = 30 #30 minutes 
    s3resource = "somepath_in_my_bucket/afile.mp4" 
    context = {} #variables I'm passing to my html template 
    response = render_to_response(template, context, context_instance=RequestContext(request)) 
    domain,cookies = generate_signed_cookies(s3resource,expire_minutes=expireLen) 
    #TROUBLESHOOTING COOKIES: 
    #NOTE - Cookie Domain must be a domain you control that spans your app & your Cloudfront CNAME 
    #NOTE - (e.g. if my webapp is www.mydomain.com and my AWS Download Distribution has cname cloud.mydomain.com, cant set cookies from webapp to 
      # www.mydomain.com or localhost.mydomain.com or cloud.mydomain.com and have them work 
     # -> instead set cookies to .mydomain.com to work across sub-domains, you can then verify in request headers to CloudFront that these cookies get passed. 
     # TIP - if you set_cookies from a page with a .mydomain.com suffix, but don't see them get set in Chrome they didn't get set because of permissions - can't set to a diff subdomain or diff base domain 
     # TIP - if you set_cookies and see them in Chrome but don't see them in request headers to Cloudfront, cookie domain is likely too narrow, need to widen to span subdomains 
    base_domain = '.mydomain.com' 
    # NOTE: Sanity check when testing so you can flag any gotchas - I have not fully tested using non-cname urls inside policy vs all possible domains for cookie itself 
    if not domain.endswith(base_domain): 
     logger.warn("This likely won't work - your resource permissions use a different domain than your cookies") 
    for name,value in cookies.items(): 
     response.set_cookie(name,value=value,httponly=True,domain=base_domain) 
    return response 

############################################ 

if __name__ == '__main__': 
    domain,cookies = generate_signed_cookies('images/*',expire_minutes=30) 

说明我的设置：

• 我仅做一个改变一个已经建立&签收的URL的工作我的下载分发：我不得不添加一个CNAME与基础域匹配我的网站。

• 我使用过Chrome Web开发工具：

  • 网络：以查看CloudFront的呼叫发送请求头，看到403 VS 200 /状态/响应大小
  • 控制台：看到403错误，直到我一切工作
  • 资源>饼干 - 验证[本地主机或主机] .mydomain.com来饼干显示填充3块的Cloudfront饼干，将它们设置为域= .mydomain.com来和这些值在请求中的值相匹配到Cloudfront的标题（如果缺少，可能的域被错误配置）

我的AWS配置

• S3需要的Cloudfront原点
• 的Cloudfront下载分发：
  • 分发设置：
    • CNAME定义：cloud.mydomain.com（NEW FOR ME ！）
    • 缺省的Cloudfront证书
  • 起源标签：1原产地定义映射到我的S3存储
  • 行为标签 - 默认：
    • 所有这些，都从设置不变我已经与签订使用网址
    • HTTP和HTTPS
    • GET，HEAD
    • 正向头：无
    • 使用原产缓存头
    • 最小TTL：0
    • 正向饼干：无
    • 正向查询字符串：没有
    • 平滑流：没有
    • 限制浏览器访问：YES（自签署的网址没有变化）
    • 信任的签名：自

个

最棘手的部分，一旦你有上方的Cookie生成代码：

• 确保cookie的访问权
• 确保在你的策略的路径/资源的请求与从您的应用程序正在进行