Add Private origin authentication support for Cloud CDN

[matheusaleixo-cit]

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Description

Add Terraform support for configuring private origin authentication using signature v4 headers. Used for private S3 buckets or other compatible object stores.

New or Affected Resource(s)

• google_compute_backend_service

Potential Terraform Configuration

resource "google_compute_backend_service" "example" {
  name          = "tf-test-backend-service-example"
  security_settings {
    aws_v4_authentication {
      access_key_id = "ELPMAXEFODNN7EXAMPLE"
      access_key = "EXAMPLEc5771d871763a393e44b703571b55cc28424d1a5e86da6ed3cELPMAXE"
      access_key_version = "prod-access-key-v1.2"
      origin_region = "us-east-2"
    }
  }
  backend {
    group = google_compute_global_network_endpoint_group.group.self_link
  }
}

References

API: Beta API for backendServices.securitySettings.awsV4Authentication

Docs: Configure private origin authentication

b/350514997

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