Terraform

resource "cloudflare_api_shield" "session_identifiers" {
  zone_id = var.zone_id
  auth_id_characteristics = [{
    name = "authorization"
    type = "header"
  }]
}

resource "cloudflare_api_shield_operation" "get_image" {
  zone_id  = var.zone_id
  method   = "GET"
  host     = "example.com"
  endpoint = "/api/images/{var1}"
}

resource "cloudflare_api_shield_operation" "post_image" {
  zone_id  = var.zone_id
  method   = "POST"
  host     = "example.com"
  endpoint = "/api/images/{var1}"
}

# Upload an OpenAPI schema for Schema Validation
resource "cloudflare_schema_validation_schemas" "example_schema" {
  zone_id            = var.zone_id
  kind               = "openapi_v3"
  name               = "example-schema.yaml"
  # In this example, we assume that the `example-schema.yaml` includes `get_image` and `post_image` operations from above
  source             = file("./schemas/example-schema.yaml")
  validation_enabled = true
}

# Setting up JWT validation with specific keying material and location of the token
resource "cloudflare_token_validation_config" "example_es256_config" {
  zone_id       = var.zone_id
  token_type    = "JWT"
  title         = "ES256 Example"
  description   = "An example configuration that validates ES256 JWTs with `b0078548-c9bc-46e5-a678-06fb72443427` key ID in the authorization header"
  token_sources = ["http.request.headers[\"authorization\"][0]"]
  credentials   = {
    keys = [
      {
        alg = "ES256"
        kid = "b0078548-c9bc-46e5-a678-06fb72443427"
        kty = "EC"
        crv = "P-256"
        x   = "yl_BZSxUG5II7kJCMxDfWImiU6zkcJcBYaTgzV3Jgnk"
        y   = "0qAzLQe_YGEdotb54qWq00k74QdiTOiWnuw_YzuIqr0"
      }
    ]
  }
}

# Setting up JWT rules for all configured endpoints on `example.com` except for `get_image`
resource "cloudflare_token_validation_rules" "example_com" {
 zone_id      = var.zone_id
 title        = "Validate JWTs on example.com"
 description  = "This actions JWT validation results for requests to example.com except for the get_image endpoint"
 action       = "block"
 enabled      = true
 # Require that the JWT described through the example_es256_config is valid.
 # Reference the ID of the generated token config, this constructs: is_jwt_valid("<id>")
 # If the expression is >not true<, Cloudflare will perform the configured action on the request
 expression   = format("(is_jwt_valid(%q))", cloudflare_token_validation_config.example_es256_config.id)
 selector     = {
    # all current and future operations matching this include selector will perform the described action when the expression fails to match
    include = [
      {
        host          = ["example.com"]
      }
    ]
    exclude = [
      {
        # reference the ID of the get_image operation to exclude it
        operation_ids = ["${cloudflare_api_shield_operation.get_image.id}"]
      }
    ]
 }
}

# With JWT validation, we can also refine session identifiers to use claims from the JWT
resource "cloudflare_api_shield" "session_identifiers" {
  zone_id = var.zone_id
  auth_id_characteristics = [{
    # select the JWT's `sub` claim as an extremely stable session identifier
    # this is "<token_config_id:json_path>" format
    name = "${cloudflare_token_validation_config.example_es256_config.id}:$.sub"
    type = "jwt"
  }]
}