def create_distribution(self):
t = self.template
s3_origin = cloudfront.Origin(
DomainName=self.origin_bucket_url,
Id="s3",
CustomOriginConfig=cloudfront.CustomOrigin(
HTTPPort=80,
HTTPSPort=443,
OriginProtocolPolicy="http-only"
),
)
default_behavior = cloudfront.DefaultCacheBehavior(
AllowedMethods=["GET", "HEAD"],
CachedMethods=["GET", "HEAD"],
ViewerProtocolPolicy="redirect-to-https",
ForwardedValues=cloudfront.ForwardedValues(
QueryString=True,
Cookies=cloudfront.Cookies(
Forward="none"
)
),
MinTTL=0,
MaxTTL=31536000,
DefaultTTL=86400,
SmoothStreaming=False,
TargetOriginId="s3",
)
viewer_certificate = NoValue
if self.certificate_arn:
viewer_certificate = cloudfront.ViewerCertificate(
AcmCertificateArn=self.certificate_arn,
SslSupportMethod="sni-only",
)
config = cloudfront.DistributionConfig(
Aliases=self.aliases,
DefaultCacheBehavior=default_behavior,
Comment="%s" % self.origin_bucket_url,
Enabled=True,
PriceClass="PriceClass_All",
ViewerCertificate=viewer_certificate,
Origins=[s3_origin],
)
self.distribution = t.add_resource(
cloudfront.Distribution(
"Distribution",
DistributionConfig=config,
)
)
self.add_output("DistributionId", self.distribution.Ref())
self.add_output(
"DomainName",
self.distribution.GetAtt("DomainName")
)
def add_cache_behaviors(self, title, cf_cache_behavior_config):
"""
Create Cloudfront CacheBehavior objects and append to list of cache_behaviors
:param title: Title of this Cloudfront Distribution
:param cf_cache_behavior_config: list of CFCacheBehavior
"""
default_cache_behavior_count = 0
cache_behavior_count = 0
for number, cache_behavior in enumerate(cf_cache_behavior_config):
forwarded_values = cloudfront.ForwardedValues(
Cookies=cloudfront.Cookies(
Forward=cache_behavior.forward_cookies),
QueryString=cache_behavior.query_string)
if cache_behavior.forwarded_headers is not None:
forwarded_values.Headers = cache_behavior.forwarded_headers
cf_cache_behavior_params = {
'AllowedMethods': cache_behavior.allowed_methods,
'CachedMethods': cache_behavior.cached_methods,
'Compress': False,
'TargetOriginId': cache_behavior.target_origin_id,
'ForwardedValues': forwarded_values,
'TrustedSigners': cache_behavior.trusted_signers,
'ViewerProtocolPolicy': cache_behavior.viewer_protocol_policy,
'MinTTL': cache_behavior.min_ttl,
'DefaultTTL': cache_behavior.default_ttl,
'MaxTTL': cache_behavior.max_ttl,
'SmoothStreaming': False
}
if cache_behavior.is_default:
# Add default cache behavior
self.default_cache_behavior = cloudfront.DefaultCacheBehavior(
'{0}DefaultCacheBehavior'.format(title),
**cf_cache_behavior_params)
default_cache_behavior_count += 1
else:
# Append additional cache behaviors to list
cf_cache_behavior_params[
'PathPattern'] = cache_behavior.path_pattern
created_cache_behavior = cloudfront.CacheBehavior(
'{0}CacheBehavior{1}'.format(title, number),
**cf_cache_behavior_params)
self.cache_behaviors.append(created_cache_behavior)
cache_behavior_count += 1
# if there is at least one cache behavior, there must be exactly one default cache behavior
if cache_behavior_count > 0 and default_cache_behavior_count != 1:
raise CloudfrontConfigError(
'Error: cf_distribution_unit {0} must have exactly one default cache behavior.'
.format(title))
def _cookies(cookies):
if cookies:
return cloudfront.Cookies(Forward='whitelist',
WhitelistedNames=cookies)
return cloudfront.Cookies(Forward='none')
def get_cloudfront_distribution_options(
self,
bucket: s3.Bucket,
oai: cloudfront.CloudFrontOriginAccessIdentity,
lambda_function_associations: List[
cloudfront.LambdaFunctionAssociation],
) -> Dict[str, Any]:
"""Retrieve the options for our CloudFront distribution.
Args:
bucket: The bucket resource
oai: The origin access identity resource.
lambda_function_associations: List of Lambda Function associations.
Return:
The CloudFront Distribution Options.
"""
if os.getenv("AWS_REGION") == "us-east-1":
# use global endpoint for us-east-1
origin = Join(".", [bucket.ref(), "s3.amazonaws.com"])
else:
# use reginal endpoint to avoid "temporary" redirect that can last over an hour
# https://forums.aws.amazon.com/message.jspa?messageID=677452
origin = Join(".", [bucket.ref(), "s3", Region, "amazonaws.com"])
return {
"Aliases":
self.add_aliases(),
"Origins": [
cloudfront.Origin(
DomainName=origin,
S3OriginConfig=cloudfront.
S3OriginConfig(OriginAccessIdentity=Join(
"", ["origin-access-identity/cloudfront/",
oai.ref()])),
Id="S3Origin",
)
],
"DefaultCacheBehavior":
cloudfront.DefaultCacheBehavior(
AllowedMethods=["GET", "HEAD"],
Compress=False,
DefaultTTL="86400",
ForwardedValues=cloudfront.ForwardedValues(
Cookies=cloudfront.Cookies(Forward="none"),
QueryString=False),
LambdaFunctionAssociations=lambda_function_associations,
TargetOriginId="S3Origin",
ViewerProtocolPolicy="redirect-to-https",
),
"DefaultRootObject":
"index.html",
"Logging":
self.add_logging_bucket(),
"PriceClass":
self.variables["PriceClass"],
"CustomErrorResponses": [
cloudfront.CustomErrorResponse(
ErrorCode=response["ErrorCode"],
ResponseCode=response["ResponseCode"],
ResponsePagePath=response["ResponsePagePath"],
) for response in self.variables["custom_error_responses"]
],
"Enabled":
True,
"WebACLId":
self.add_web_acl(),
"ViewerCertificate":
self.add_acm_cert(),
}
def create_template(self):
"""Create template (main function called by Stacker)."""
template = self.template
variables = self.get_variables()
template.set_version('2010-09-09')
template.set_description('Static Website - Bucket and Distribution')
# Conditions
template.add_condition(
'AcmCertSpecified',
And(Not(Equals(variables['AcmCertificateArn'].ref, '')),
Not(Equals(variables['AcmCertificateArn'].ref, 'undefined')))
)
template.add_condition(
'AliasesSpecified',
And(Not(Equals(Select(0, variables['Aliases'].ref), '')),
Not(Equals(Select(0, variables['Aliases'].ref), 'undefined')))
)
template.add_condition(
'CFLoggingEnabled',
And(Not(Equals(variables['LogBucketName'].ref, '')),
Not(Equals(variables['LogBucketName'].ref, 'undefined')))
)
template.add_condition(
'DirectoryIndexSpecified',
And(Not(Equals(variables['RewriteDirectoryIndex'].ref, '')),
Not(Equals(variables['RewriteDirectoryIndex'].ref, 'undefined'))) # noqa
)
template.add_condition(
'WAFNameSpecified',
And(Not(Equals(variables['WAFWebACL'].ref, '')),
Not(Equals(variables['WAFWebACL'].ref, 'undefined')))
)
# Resources
oai = template.add_resource(
cloudfront.CloudFrontOriginAccessIdentity(
'OAI',
CloudFrontOriginAccessIdentityConfig=cloudfront.CloudFrontOriginAccessIdentityConfig( # noqa pylint: disable=line-too-long
Comment='CF access to website'
)
)
)
bucket = template.add_resource(
s3.Bucket(
'Bucket',
AccessControl=s3.Private,
LifecycleConfiguration=s3.LifecycleConfiguration(
Rules=[
s3.LifecycleRule(
NoncurrentVersionExpirationInDays=90,
Status='Enabled'
)
]
),
VersioningConfiguration=s3.VersioningConfiguration(
Status='Enabled'
),
WebsiteConfiguration=s3.WebsiteConfiguration(
IndexDocument='index.html',
ErrorDocument='error.html'
)
)
)
template.add_output(Output(
'BucketName',
Description='Name of website bucket',
Value=bucket.ref()
))
allowcfaccess = template.add_resource(
s3.BucketPolicy(
'AllowCFAccess',
Bucket=bucket.ref(),
PolicyDocument=PolicyDocument(
Version='2012-10-17',
Statement=[
Statement(
Action=[awacs.s3.GetObject],
Effect=Allow,
Principal=Principal(
'CanonicalUser',
oai.get_att('S3CanonicalUserId')
),
Resource=[
Join('', [bucket.get_att('Arn'),
'/*'])
]
)
]
)
)
)
cfdirectoryindexrewriterole = template.add_resource(
iam.Role(
'CFDirectoryIndexRewriteRole',
Condition='DirectoryIndexSpecified',
AssumeRolePolicyDocument=PolicyDocument(
Version='2012-10-17',
Statement=[
Statement(
Effect=Allow,
Action=[awacs.sts.AssumeRole],
Principal=Principal('Service',
['lambda.amazonaws.com',
'edgelambda.amazonaws.com'])
)
]
),
ManagedPolicyArns=[
IAM_ARN_PREFIX + 'AWSLambdaBasicExecutionRole'
]
)
)
cfdirectoryindexrewrite = template.add_resource(
awslambda.Function(
'CFDirectoryIndexRewrite',
Condition='DirectoryIndexSpecified',
Code=awslambda.Code(
ZipFile=Join(
'',
["'use strict';\n",
"exports.handler = (event, context, callback) => {\n",
"\n",
" // Extract the request from the CloudFront event that is sent to Lambda@Edge\n", # noqa pylint: disable=line-too-long
" var request = event.Records[0].cf.request;\n",
" // Extract the URI from the request\n",
" var olduri = request.uri;\n",
" // Match any '/' that occurs at the end of a URI. Replace it with a default index\n", # noqa pylint: disable=line-too-long
" var newuri = olduri.replace(/\\/$/, '\\/",
variables['RewriteDirectoryIndex'].ref,
"');\n", # noqa
" // Log the URI as received by CloudFront and the new URI to be used to fetch from origin\n", # noqa pylint: disable=line-too-long
" console.log(\"Old URI: \" + olduri);\n",
" console.log(\"New URI: \" + newuri);\n",
" // Replace the received URI with the URI that includes the index page\n", # noqa pylint: disable=line-too-long
" request.uri = newuri;\n",
" // Return to CloudFront\n",
" return callback(null, request);\n",
"\n",
"};\n"]
)
),
Description='Rewrites CF directory HTTP requests to default page', # noqa
Handler='index.handler',
Role=cfdirectoryindexrewriterole.get_att('Arn'),
Runtime='nodejs8.10'
)
)
# Generating a unique resource name here for the Lambda version, so it
# updates automatically if the lambda code changes
code_hash = hashlib.md5(
str(cfdirectoryindexrewrite.properties['Code'].properties['ZipFile'].to_dict()).encode() # noqa pylint: disable=line-too-long
).hexdigest()
cfdirectoryindexrewritever = template.add_resource(
awslambda.Version(
'CFDirectoryIndexRewriteVer' + code_hash,
Condition='DirectoryIndexSpecified',
FunctionName=cfdirectoryindexrewrite.ref()
)
)
# If custom associations defined, use them
if variables['lambda_function_associations']:
lambda_function_associations = [
cloudfront.LambdaFunctionAssociation(
EventType=x['type'],
LambdaFunctionARN=x['arn']
) for x in variables['lambda_function_associations']
]
else: # otherwise fallback to pure CFN condition
lambda_function_associations = If(
'DirectoryIndexSpecified',
[cloudfront.LambdaFunctionAssociation(
EventType='origin-request',
LambdaFunctionARN=cfdirectoryindexrewritever.ref()
)],
NoValue
)
cfdistribution = template.add_resource(
get_cf_distribution_class()(
'CFDistribution',
DependsOn=allowcfaccess.title,
DistributionConfig=get_cf_distro_conf_class()(
Aliases=If(
'AliasesSpecified',
variables['Aliases'].ref,
NoValue
),
Origins=[
get_cf_origin_class()(
DomainName=Join(
'.',
[bucket.ref(),
's3.amazonaws.com']),
S3OriginConfig=get_s3_origin_conf_class()(
OriginAccessIdentity=Join(
'',
['origin-access-identity/cloudfront/',
oai.ref()])
),
Id='S3Origin'
)
],
DefaultCacheBehavior=cloudfront.DefaultCacheBehavior(
AllowedMethods=['GET', 'HEAD'],
Compress=False,
DefaultTTL='86400',
ForwardedValues=cloudfront.ForwardedValues(
Cookies=cloudfront.Cookies(Forward='none'),
QueryString=False,
),
LambdaFunctionAssociations=lambda_function_associations, # noqa
TargetOriginId='S3Origin',
ViewerProtocolPolicy='redirect-to-https'
),
DefaultRootObject='index.html',
Logging=If(
'CFLoggingEnabled',
cloudfront.Logging(
Bucket=Join('.',
[variables['LogBucketName'].ref,
's3.amazonaws.com'])
),
NoValue
),
PriceClass=variables['PriceClass'].ref,
Enabled=True,
WebACLId=If(
'WAFNameSpecified',
variables['WAFWebACL'].ref,
NoValue
),
ViewerCertificate=If(
'AcmCertSpecified',
cloudfront.ViewerCertificate(
AcmCertificateArn=variables['AcmCertificateArn'].ref, # noqa
SslSupportMethod='sni-only'
),
NoValue
)
)
)
)
template.add_output(Output(
'CFDistributionId',
Description='CloudFront distribution ID',
Value=cfdistribution.ref()
))
template.add_output(
Output(
'CFDistributionDomainName',
Description='CloudFront distribution domain name',
Value=cfdistribution.get_att('DomainName')
)
)
# has the Lambda-function associated.
],
DefaultCacheBehavior=cloudfront.DefaultCacheBehavior(
ViewerProtocolPolicy=
'redirect-to-https', # HTTPS required. Cookies need to be sent securely
LambdaFunctionAssociations=[
cloudfront.LambdaFunctionAssociation(
EventType='viewer-request',
LambdaFunctionARN=Ref(param_authorizer_lae_arn)),
],
# Rest of config as per your needs
TargetOriginId='ExampleS3',
ForwardedValues=cloudfront.ForwardedValues(
QueryString=True,
Cookies=cloudfront.Cookies(
Forward=
'all', # Don't do this. Done here to validate cookie-removal logic
),
),
),
ViewerCertificate=cloudfront.ViewerCertificate(
AcmCertificateArn=Ref(acm_cert),
SslSupportMethod='sni-only',
),
),
Tags=GetAtt(cloudformation_tags, 'TagList'),
))
hosted_zone_map = "HostedZoneMap"
template.add_mapping(hosted_zone_map, cfnutils.mappings.r53_hosted_zone_id())
template.add_resource(
def get_cloudfront_distribution_options(
self, # type: StaticSite
bucket, # type: s3.Bucket
oai, # type: cloudfront.CloudFrontOriginAccessIdentity # noqa pylint: disable=line-too-long
lambda_function_associations # type: List[cloudfront.LambdaFunctionAssociation] # noqa pylint: disable=line-too-long
# TODO remove after dropping python 2
): # pylint: disable=bad-continuation
# type: (...) -> Dict[str, Any]
"""Retrieve the options for our CloudFront distribution.
Keyword Args:
bucket (dict): The bucket resource
oai (dict): The origin access identity resource
lambda_function_associations (array): The lambda function association array
Return:
dict: The CloudFront Distribution Options
"""
variables = self.get_variables()
return {
'Aliases':
self.add_aliases(),
'Origins': [
cloudfront.Origin(
DomainName=Join('.', [bucket.ref(), 's3.amazonaws.com']),
S3OriginConfig=cloudfront.
S3OriginConfig(OriginAccessIdentity=Join(
'', ['origin-access-identity/cloudfront/',
oai.ref()])),
Id='S3Origin')
],
'DefaultCacheBehavior':
cloudfront.DefaultCacheBehavior(
AllowedMethods=['GET', 'HEAD'],
Compress=False,
DefaultTTL='86400',
ForwardedValues=cloudfront.ForwardedValues(
Cookies=cloudfront.Cookies(Forward='none'),
QueryString=False,
),
LambdaFunctionAssociations=lambda_function_associations,
TargetOriginId='S3Origin',
ViewerProtocolPolicy='redirect-to-https'),
'DefaultRootObject':
'index.html',
'Logging':
self.add_logging_bucket(),
'PriceClass':
variables['PriceClass'],
'CustomErrorResponses': [
cloudfront.CustomErrorResponse(
ErrorCode=response['ErrorCode'],
ResponseCode=response['ResponseCode'],
ResponsePagePath=response['ResponsePagePath'])
for response in variables['custom_error_responses']
],
'Enabled':
True,
'WebACLId':
self.add_web_acl(),
'ViewerCertificate':
self.add_acm_cert()
}
Default='/media/*',
Description='Specify which requests you want to route to the origin.',
Type='String'))
# endregion
# region Resources
distribution = template.add_resource(
cloudfront.Distribution(
'Distribution',
DistributionConfig=cloudfront.DistributionConfig(
Aliases=[Ref(domain)],
CacheBehaviors=[
cloudfront.CacheBehavior(
Compress=True,
ForwardedValues=cloudfront.ForwardedValues(
Cookies=cloudfront.Cookies(Forward='none'),
QueryString=False,
),
PathPattern=Ref(media_pattern),
TargetOriginId=Sub(
'${domain}${path}', **{
'domain': Ref(media_domain),
'path': Ref(media_path)
}),
ViewerProtocolPolicy='redirect-to-https',
)
],
Comment=Sub('${AWS::StackName}'),
DefaultCacheBehavior=cloudfront.DefaultCacheBehavior(
Compress=True,
ForwardedValues=cloudfront.ForwardedValues(
def cloudfront_distribution(self):
if self.vars["AcmCertificateARN"]:
viewer_certificate = cf.ViewerCertificate(
SslSupportMethod="sni-only",
MinimumProtocolVersion="TLSv1",
AcmCertificateArn=self.vars["AcmCertificateARN"],
)
url_prefix = 'https://'
else:
viewer_certificate = NoValue
url_prefix = 'http://'
t = self.template
self.SiteCFDistribution = t.add_resource(
cf.Distribution(
"SiteCFDistribution",
DistributionConfig=cf.DistributionConfig(
Comment="S3 Distribution",
Logging=cf.Logging(
Prefix=self.vars["FQDNPublic"] + "/cloudfront_logs/",
Bucket=self.vars["LogBucket"] + ".s3.amazonaws.com",
IncludeCookies="false"),
WebACLId=self.vars["WebACLId"],
Origins=[
cf.Origin(
S3OriginConfig=cf.S3Origin(OriginAccessIdentity=(
"origin-access-identity/cloudfront/" +
self.vars["OriginAccessIdentity"]), ),
Id="myS3Origin",
DomainName=GetAtt(self.SiteBucket, "DomainName"),
OriginPath=self.vars["OriginPath"],
)
],
DefaultRootObject=self.vars["DefaultRootObject"],
PriceClass="PriceClass_100",
Enabled="true",
DefaultCacheBehavior=cf.DefaultCacheBehavior(
ViewerProtocolPolicy="redirect-to-https",
ForwardedValues=cf.ForwardedValues(
Cookies=cf.Cookies(Forward="none"),
QueryString="true"),
TargetOriginId="myS3Origin",
DefaultTTL=self.vars["DefaultTTL"],
),
Aliases=[self.vars["FQDNPublic"]],
ViewerCertificate=viewer_certificate,
),
))
CloudFrontDistribution = t.add_output(
Output(
"CloudFrontDistribution",
Description="Cloudfront distribution domainname in AWS",
Value=GetAtt(self.SiteCFDistribution, "DomainName"),
))
WebsiteURL = t.add_output(
Output(
"WebsiteURL",
Description="Public URL of cloudfront hosted website",
Value=url_prefix + self.vars["FQDNPublic"],
))
def __init__(self, title, key, **kwargs):
super().__init__(title, **kwargs)
name = self.title
if 'AllowedMethods' in key:
self.AllowedMethods = get_endvalue(f'{name}AllowedMethods')
if 'CachedMethods' in key:
self.CachedMethods = get_endvalue(f'{name}CachedMethods')
# If not defined default to True
if 'Compress' in key:
self.Compress = get_endvalue(f'{name}Compress')
else:
self.Compress = True
if 'DefaultTTL' in key:
self.DefaultTTL = get_endvalue(f'{name}DefaultTTL')
self.ForwardedValues = clf.ForwardedValues()
# If not defined default to True
if 'QueryString' in key:
self.ForwardedValues.QueryString = get_endvalue(
f'{name}QueryString')
else:
self.ForwardedValues.QueryString = True
if 'CookiesForward' in key:
self.ForwardedValues.Cookies = clf.Cookies(
Forward=get_endvalue(f'{name}CookiesForward'))
if 'CookiesWhitelistedNames' in key:
self.ForwardedValues.Cookies.WhitelistedNames = (get_endvalue(
f'{name}CookiesWhitelistedNames', condition=True))
# conditions
c_CookiesForward = get_condition(
f'{name}CookiesWhitelistedNames', 'equals', 'whitelist',
f'{name}CookiesForward')
add_obj(c_CookiesForward)
# If not defined default to 'Host'
if 'Headers' in key:
self.ForwardedValues.Headers = get_endvalue(f'{name}Headers')
else:
self.ForwardedValues.Headers = ['Host']
if 'QueryStringCacheKeys' in key:
self.ForwardedValues.QueryStringCacheKeys = get_endvalue(
f'{name}QueryStringCacheKeys', condition=True)
# conditions
c_QueryString = get_condition(f'{name}QueryStringCacheKeys',
'equals', True, f'{name}QueryString')
add_obj(c_QueryString)
if 'TargetOriginId' in key:
self.TargetOriginId = get_endvalue(f'{name}TargetOriginId')
else:
self.TargetOriginId = If(
'CloudFrontOriginAdHoc', Ref('RecordSetExternal'),
Sub('${EnvRole}${RecordSetCloudFrontSuffix}.origin.%s' %
cfg.HostedZoneNameEnv))
if 'MaxTTL' in key:
self.MaxTTL = get_endvalue(f'{name}MaxTTL')
if 'MinTTL' in key:
self.MinTTL = get_endvalue(f'{name}MinTTL')
if 'LambdaFunctionARN' in key:
condname = f'{name}LambdaFunctionARN'
eventType = 'origin-request'
if 'LambdaEventType' in key:
eventType = key['LambdaEventType']
# conditions
add_obj(get_condition(condname, 'not_equals', 'None'))
self.LambdaFunctionAssociations = [
If(
condname,
clf.LambdaFunctionAssociation(
EventType=eventType,
LambdaFunctionARN=get_endvalue(condname)),
Ref('AWS::NoValue'))
]
if 'ViewerProtocolPolicy' in key:
self.ViewerProtocolPolicy = get_endvalue(
f'{name}ViewerProtocolPolicy')
else:
self.ViewerProtocolPolicy = 'redirect-to-https'
def render_cloudfront(context, template, origin_hostname):
if not context['cloudfront']['origins']:
ensure(
context['full_hostname'],
"A public hostname is required to be pointed at by the Cloudfront CDN"
)
allowed_cnames = context['cloudfront']['subdomains'] + context[
'cloudfront']['subdomains-without-dns']
if context['cloudfront']['cookies']:
cookies = cloudfront.Cookies(
Forward='whitelist',
WhitelistedNames=context['cloudfront']['cookies'])
else:
cookies = cloudfront.Cookies(Forward='none')
if context['cloudfront']['origins']:
origins = [
cloudfront.Origin(DomainName=o['hostname'],
Id=o_id,
CustomOriginConfig=cloudfront.CustomOrigin(
HTTPSPort=443,
OriginProtocolPolicy='https-only'))
for o_id, o in context['cloudfront']['origins'].items()
]
origin = origins[0].Id
else:
origin = CLOUDFRONT_TITLE + 'Origin'
origins = [
cloudfront.Origin(DomainName=origin_hostname,
Id=origin,
CustomOriginConfig=cloudfront.CustomOrigin(
HTTPSPort=443,
OriginProtocolPolicy='https-only'))
]
props = {
'Aliases':
allowed_cnames,
'DefaultCacheBehavior':
cloudfront.DefaultCacheBehavior(
AllowedMethods=[
'DELETE', 'GET', 'HEAD', 'OPTIONS', 'PATCH', 'POST', 'PUT'
],
CachedMethods=['GET', 'HEAD'],
Compress=context['cloudfront']['compress'],
DefaultTTL=context['cloudfront']['default-ttl'],
TargetOriginId=origin,
ForwardedValues=cloudfront.ForwardedValues(
Cookies=cookies,
Headers=context['cloudfront']
['headers'], # 'whitelisted' headers
QueryString=True),
ViewerProtocolPolicy='redirect-to-https',
),
'Enabled':
True,
'HttpVersion':
'http2',
'Origins':
origins,
'ViewerCertificate':
cloudfront.ViewerCertificate(
IamCertificateId=context['cloudfront']['certificate_id'],
SslSupportMethod='sni-only')
}
def _cache_behavior(origin_id, pattern):
return cloudfront.CacheBehavior(
TargetOriginId=origin_id,
DefaultTTL=context['cloudfront']['default-ttl'],
ForwardedValues=cloudfront.ForwardedValues(QueryString=False),
PathPattern=pattern,
ViewerProtocolPolicy='allow-all',
)
if context['cloudfront']['errors']:
props['Origins'].append(
cloudfront.Origin(
DomainName=context['cloudfront']['errors']['domain'],
# TODO: constant
Id=CLOUDFRONT_ERROR_ORIGIN_ID,
# no advantage in using cloudfront.S3Origin for public buckets
CustomOriginConfig=cloudfront.CustomOrigin(
HTTPSPort=443,
OriginProtocolPolicy='https-only'
if context['cloudfront']['errors']['protocol'] == 'https'
else 'http-only')))
props['CacheBehaviors'] = [
_cache_behavior(
CLOUDFRONT_ERROR_ORIGIN_ID,
context['cloudfront']['errors']['pattern'],
)
]
props['CustomErrorResponses'] = [
cloudfront.CustomErrorResponse(ErrorCode=code,
ResponseCode=code,
ResponsePagePath=page)
for code, page in context['cloudfront']['errors']['codes'].items()
]
if context['cloudfront']['origins']:
props['CacheBehaviors'] = [
_cache_behavior(o_id, o['pattern'])
for o_id, o in context['cloudfront']['origins'].items()
if o['pattern']
]
template.add_resource(
cloudfront.Distribution(
CLOUDFRONT_TITLE,
DistributionConfig=cloudfront.DistributionConfig(**props)))
for dns in external_dns_cloudfront(context):
template.add_resource(dns)
def create_template(self):
"""Create template (main function called by Stacker)."""
template = self.template
variables = self.get_variables()
template.add_version('2010-09-09')
template.add_description('Static Website - Bucket and Distribution')
# Conditions
template.add_condition(
'AcmCertSpecified',
And(Not(Equals(variables['AcmCertificateArn'].ref, '')),
Not(Equals(variables['AcmCertificateArn'].ref, 'undefined'))))
template.add_condition(
'AliasesSpecified',
And(Not(Equals(Select(0, variables['Aliases'].ref), '')),
Not(Equals(Select(0, variables['Aliases'].ref), 'undefined'))))
template.add_condition(
'CFLoggingEnabled',
And(Not(Equals(variables['LogBucketName'].ref, '')),
Not(Equals(variables['LogBucketName'].ref, 'undefined'))))
template.add_condition(
'WAFNameSpecified',
And(Not(Equals(variables['WAFWebACL'].ref, '')),
Not(Equals(variables['WAFWebACL'].ref, 'undefined'))))
# Resources
oai = template.add_resource(
cloudfront.CloudFrontOriginAccessIdentity(
'OAI',
CloudFrontOriginAccessIdentityConfig=cloudfront.
CloudFrontOriginAccessIdentityConfig( # noqa pylint: disable=line-too-long
Comment='CF access to website')))
bucket = template.add_resource(
s3.Bucket(
'Bucket',
AccessControl=s3.Private,
LifecycleConfiguration=s3.LifecycleConfiguration(Rules=[
s3.LifecycleRule(NoncurrentVersionExpirationInDays=90,
Status='Enabled')
]),
VersioningConfiguration=s3.VersioningConfiguration(
Status='Enabled'),
WebsiteConfiguration=s3.WebsiteConfiguration(
IndexDocument='index.html', ErrorDocument='error.html')))
template.add_output(
Output('BucketName',
Description='Name of website bucket',
Value=bucket.ref()))
allowcfaccess = template.add_resource(
s3.BucketPolicy(
'AllowCFAccess',
Bucket=bucket.ref(),
PolicyDocument=Policy(
Version='2012-10-17',
Statement=[
Statement(
Action=[awacs.s3.GetObject],
Effect=Allow,
Principal=Principal(
'CanonicalUser',
oai.get_att('S3CanonicalUserId')),
Resource=[Join('', [bucket.get_att('Arn'), '/*'])])
])))
cfdistribution = template.add_resource(
cloudfront.Distribution(
'CFDistribution',
DependsOn=allowcfaccess.title,
DistributionConfig=cloudfront.DistributionConfig(
Aliases=If('AliasesSpecified', variables['Aliases'].ref,
NoValue),
Origins=[
cloudfront.Origin(
DomainName=Join(
'.', [bucket.ref(), 's3.amazonaws.com']),
S3OriginConfig=cloudfront.S3Origin(
OriginAccessIdentity=Join(
'', [
'origin-access-identity/cloudfront/',
oai.ref()
])),
Id='S3Origin')
],
DefaultCacheBehavior=cloudfront.DefaultCacheBehavior(
AllowedMethods=['GET', 'HEAD'],
Compress=False,
DefaultTTL='86400',
ForwardedValues=cloudfront.ForwardedValues(
Cookies=cloudfront.Cookies(Forward='none'),
QueryString=False,
),
TargetOriginId='S3Origin',
ViewerProtocolPolicy='redirect-to-https'),
DefaultRootObject='index.html',
Logging=If(
'CFLoggingEnabled',
cloudfront.Logging(Bucket=Join('.', [
variables['LogBucketName'].ref, 's3.amazonaws.com'
])), NoValue),
PriceClass=variables['PriceClass'].ref,
Enabled=True,
WebACLId=If('WAFNameSpecified', variables['WAFWebACL'].ref,
NoValue),
ViewerCertificate=If(
'AcmCertSpecified',
cloudfront.ViewerCertificate(
AcmCertificateArn=variables['AcmCertificateArn'].
ref, # noqa
SslSupportMethod='sni-only'),
NoValue))))
template.add_output(
Output('CFDistributionId',
Description='CloudFront distribution ID',
Value=cfdistribution.ref()))
template.add_output(
Output('CFDistributionDomainName',
Description='CloudFront distribution domain name',
Value=cfdistribution.get_att('DomainName')))
def get_cloudfront_distribution_options(
self,
bucket, # type: s3.Bucket
oai, # type: cloudfront.CloudFrontOriginAccessIdentity
lambda_function_associations, # type: List[cloudfront.LambdaFunctionAssociation]
):
# type: (...) -> Dict[str, Any]
"""Retrieve the options for our CloudFront distribution.
Args:
bucket: The bucket resource
oai: The origin access identity resource.
lambda_function_associations: List of Lambda Function associations.
Return:
The CloudFront Distribution Options.
"""
variables = self.get_variables()
return {
"Aliases":
self.add_aliases(),
"Origins": [
cloudfront.Origin(
DomainName=Join(".", [bucket.ref(), "s3.amazonaws.com"]),
S3OriginConfig=cloudfront.
S3OriginConfig(OriginAccessIdentity=Join(
"", ["origin-access-identity/cloudfront/",
oai.ref()])),
Id="S3Origin",
)
],
"DefaultCacheBehavior":
cloudfront.DefaultCacheBehavior(
AllowedMethods=["GET", "HEAD"],
Compress=False,
DefaultTTL="86400",
ForwardedValues=cloudfront.ForwardedValues(
Cookies=cloudfront.Cookies(Forward="none"),
QueryString=False,
),
LambdaFunctionAssociations=lambda_function_associations,
TargetOriginId="S3Origin",
ViewerProtocolPolicy="redirect-to-https",
),
"DefaultRootObject":
"index.html",
"Logging":
self.add_logging_bucket(),
"PriceClass":
variables["PriceClass"],
"CustomErrorResponses": [
cloudfront.CustomErrorResponse(
ErrorCode=response["ErrorCode"],
ResponseCode=response["ResponseCode"],
ResponsePagePath=response["ResponsePagePath"],
) for response in variables["custom_error_responses"]
],
"Enabled":
True,
"WebACLId":
self.add_web_acl(),
"ViewerCertificate":
self.add_acm_cert(),
}
cloudfront.CacheBehavior(
# The authorizer hijacks a set of URL-paths from your website. All paths are prefixed
# with `/auth-<UUID>/`, so they are very unlikely to collide with your content.
# Insert this as the first Behaviour.
PathPattern=Join('', [
ImportValue(
Sub('${' + authorizer_stack.title +
'}-magic-path')),
'/*',
]),
ViewerProtocolPolicy='https-only',
TargetOriginId='Authorizer',
ForwardedValues=cloudfront.ForwardedValues(
QueryString=True,
Cookies=cloudfront.Cookies(
Forward='all', # Needed to allow Set-Cookie:-headers
),
),
MinTTL=0,
DefaultTTL=0,
MaxTTL=0,
)
],
DefaultCacheBehavior=cloudfront.DefaultCacheBehavior(
ViewerProtocolPolicy=
'redirect-to-https', # HTTPS required. Cookies need to be sent securely
LambdaFunctionAssociations=[
cloudfront.LambdaFunctionAssociation(
EventType='viewer-request',
LambdaFunctionARN=Ref(param_authorizer_lae_arn)),
],