Terraform Module: CloudFront Middleware-at-Edge

This Terraform module deploys customizable and reusable Lambda@Edge functions that provide middleware for AWS CloudFront.

Middlewares

• auth-at-edge: Also known as cognito-at-edge, this feature provides authentication and authorization to restrict access to a site hosted on CloudFront. Users can optionally customize the authorization rules via an Open Policy Agent (OPA) policy.
• url-rewriter: This feature rewrites the URLs of requests. Users can define URL rewrite rules via an Open Policy Agent (OPA) policy.

Usage

module "cloudfront_middleware_at_edge" {
  source  = "cruxstack/cloudfront-middleware-at-edge/aws"
  version = "x.x.x"

  auth_service_config = {
    enabled                   = true
    cognito_idp_arn           = "arn:aws:cognito-idp:us-east-1:123456789012:userpool/us-east-1_TESTPOOL"
    cognito_idp_domain        = "test.auth.us-east-1.amazoncognito.com"
    cognito_idp_client_id     = "your-client-id"
    cognito_idp_client_secret = "your-client-secret"
    cognito_idp_client_scopes = ["openid", "email", "profile"]

    cognito_idp_jwks = {
      keys = [
        { "alg": "RS256", "e": "AQAB", "kid": "...", "kty": "RSA", "n": "...", "use": "sig" },
        { "alg": "RS256", "e": "AQAB", "kid": "...", "kty": "RSA", "n": "...", "use": "sig" },
      ]
    }
  }

  urlrewrite_service_config = {
    enabled    = true
    policy_content = <<-EOF
      package urlrewriter
      result := []
    EOF
  }
}

Inputs

In addition to the variables documented below, this module includes several other optional variables (e.g., name, tags, etc.) provided by the cloudposse/label/null module. Please refer to its documentation for more details on these variables.

Name	Description	Type	Default	Required
auth_service_config	Configuration details for the authentication service. More details below.	object	{}	no
urlrewrite_service_config	Configuration details for the URL rewrite service, More details below.	object	{}	no
aws_account_id	The AWS account ID that the module will be deployed in	string	""	no
aws_region_name	The AWS region name where the module will be deployed	string	""	no

auth_service_config

Property	Description	Type	Default	Required
enabled	Enable the authentication service	bool	true	no
log_level	Logging level	string	"info"	no
aws_region	AWS region for the service	string	null	no
cognito_idp_arn	ARN of the Cognito Identity Provider	string	n/a	yes
cognito_idp_domain	Domain of the Cognito Identity Provider	string	n/a	yes
cognito_idp_jwks	JWKS of the Cognito Identity Provider	object({ keys = list(map(string)) })	n/a	yes
cognito_idp_client_id	Client ID of the Cognito Identity Provider	string	n/a	yes
cognito_idp_client_secret	Client secret of the Cognito Identity Provider	string	n/a	yes
cognito_idp_client_scopes	Client scopes of the Cognito Identity Provider	list(string)	n/a	yes
opa_policy_content	Content of the OPA policy	string	null	no
opa_policy_data	Data for the OPA policy	map(string)	{}	no

urlrewrite_service_config

Property	Description	Type	Default	Required
enabled	Enable the URL rewrite service	bool	false	no
log_level	Logging level	string	"info"	no
aws_region	AWS region for the service	string	null	no
policy_content	Content of the URL rewrite policy	string	"package urlrewriter\nresult := []"	no

Outputs

Name	Description
auth_services	Details of the created AWS Lambda functions for each of the auth services
auth_routes	Route configurations for the auth services
urlrewrite_services	Details of the created AWS Lambda function for the URL rewrite service

Contributing

We welcome contributions to this project. For information on setting up a development environment and how to make a contribution, see CONTRIBUTING documentation.