[Terraform] API Gateway to get Elastic Beanstalk IP(s)

eb-api-gw.tf

provider "aws" {
    region = "ap-northeast-1"
    allowed_account_ids = ["${var.names.account_id}"]
}

variable "names" {
    default = {
        account_id = "$ACCOUNT_ID"
    }
}

# REST API
resource "aws_api_gateway_rest_api" "EB" {
  name = "EB"
  description = "get EB info"
}

# Resources
resource "aws_api_gateway_resource" "eb" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  parent_id = "${aws_api_gateway_rest_api.EB.root_resource_id}"
  path_part = "eb"
}

resource "aws_api_gateway_resource" "env_name" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  parent_id = "${aws_api_gateway_resource.eb.id}"
  path_part = "{env_name}"
}

resource "aws_api_gateway_resource" "ip" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  parent_id = "${aws_api_gateway_resource.env_name.id}"
  path_part = "ip"
}

resource "aws_api_gateway_resource" "server_num" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  parent_id = "${aws_api_gateway_resource.ip.id}"
  path_part = "{server_num}"
}

# Methods
resource "aws_api_gateway_method" "ip_get" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  resource_id = "${aws_api_gateway_resource.ip.id}"
  http_method = "GET"
  authorization = "NONE"
}

resource "aws_api_gateway_method" "server_num_get" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  resource_id = "${aws_api_gateway_resource.server_num.id}"
  http_method = "GET"
  authorization = "NONE"
}

# Integrations
resource "aws_api_gateway_integration" "ip_get" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  resource_id = "${aws_api_gateway_resource.ip.id}"
  http_method = "${aws_api_gateway_method.ip_get.http_method}"
  integration_http_method = "POST"
  type = "AWS"
  uri = "arn:aws:apigateway:ap-northeast-1:lambda:path/2015-03-31/functions/arn:aws:lambda:ap-northeast-1:${var.names.account_id}:function:eb_ip/invocations"
  request_templates = {
    "application/json" = "{ \"env_name\": \"$input.params('env_name')\" }"
  }
  depends_on = ["aws_api_gateway_method.ip_get"]
}

resource "aws_api_gateway_integration" "server_num_get" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  resource_id = "${aws_api_gateway_resource.server_num.id}"
  http_method = "${aws_api_gateway_method.server_num_get.http_method}"
  integration_http_method = "POST"
  type = "AWS"
  uri = "arn:aws:apigateway:ap-northeast-1:lambda:path/2015-03-31/functions/arn:aws:lambda:ap-northeast-1:${var.names.account_id}:function:eb_ip/invocations"
  request_templates = {
    "application/json" = "{\n \"env_name\": \"$input.params('env_name')\",\n \"server_num\": \"$input.params('server_num')\" \n}"
  }
  depends_on = ["aws_api_gateway_method.server_num_get"]
}

# Method responses
resource "aws_api_gateway_method_response" "ip_200" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  resource_id = "${aws_api_gateway_resource.ip.id}"
  http_method = "${aws_api_gateway_method.ip_get.http_method}"
  status_code = "200"
}

resource "aws_api_gateway_method_response" "ip_400" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  resource_id = "${aws_api_gateway_resource.ip.id}"
  http_method = "${aws_api_gateway_method.ip_get.http_method}"
  status_code = "400"
  depends_on = ["aws_api_gateway_method_response.ip_200"]
}

resource "aws_api_gateway_method_response" "server_num_200" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  resource_id = "${aws_api_gateway_resource.server_num.id}"
  http_method = "${aws_api_gateway_method.server_num_get.http_method}"
  status_code = "200"
}

resource "aws_api_gateway_method_response" "server_num_400" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  resource_id = "${aws_api_gateway_resource.server_num.id}"
  http_method = "${aws_api_gateway_method.server_num_get.http_method}"
  status_code = "400"
  depends_on = ["aws_api_gateway_method_response.server_num_200"]
}


# Integration responses
resource "aws_api_gateway_integration_response" "ip_get_200" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  resource_id = "${aws_api_gateway_resource.ip.id}"
  http_method = "${aws_api_gateway_method.ip_get.http_method}"
  status_code = "${aws_api_gateway_method_response.ip_200.status_code}"
  response_templates = {
    "application/json" = "$input.path('$')"
  }
}

resource "aws_api_gateway_integration_response" "ip_get_400" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  resource_id = "${aws_api_gateway_resource.ip.id}"
  http_method = "${aws_api_gateway_method.ip_get.http_method}"
  status_code = "${aws_api_gateway_method_response.ip_400.status_code}"
  selection_pattern = "[^0-9](.|\n)*"
  response_templates = {
    "application/json" = "$input.path('$').errorMessage"
  }
  depends_on = ["aws_api_gateway_integration_response.ip_get_200"]
}

resource "aws_api_gateway_integration_response" "server_num_get_200" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  resource_id = "${aws_api_gateway_resource.server_num.id}"
  http_method = "${aws_api_gateway_method.server_num_get.http_method}"
  status_code = "${aws_api_gateway_method_response.server_num_200.status_code}"
  response_templates = {
    "application/json" = "$input.path('$')"
  }
}

resource "aws_api_gateway_integration_response" "server_num_get_400" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  resource_id = "${aws_api_gateway_resource.server_num.id}"
  http_method = "${aws_api_gateway_method.server_num_get.http_method}"
  status_code = "${aws_api_gateway_method_response.server_num_400.status_code}"
  selection_pattern = "[^0-9](.|\n)*"
  response_templates = {
    "application/json" = "$input.path('$').errorMessage"
  }
  depends_on = ["aws_api_gateway_integration_response.server_num_get_200"]
}

resource "aws_api_gateway_deployment" "eb_deployment" {
  rest_api_id = "${aws_api_gateway_rest_api.EB.id}"
  depends_on = ["aws_api_gateway_integration.ip_get"]
  stage_name = "prod"
}

# Permissions
#resource "aws_lambda_permission" "apigw_ip" {
#  statement_id = "apigw_for_ip"
#  action = "lambda:InvokeFunction"
#  function_name = "eb_ip"
#  principal = "apigateway.amazonaws.com"
#  source_arn = "arn:aws:execute-api:ap-northeast-1:${var.names.account_id}:${aws_api_gateway_rest_api.EB.id}/*/GET/eb/*/${aws_api_gateway_resource.ip.path_part}"
#}

#resource "aws_lambda_permission" "apigw_server_num" {
#  statement_id = "apigw_for_server_num"
#  action = "lambda:InvokeFunction"
#  function_name = "eb_ip"
#  principal = "apigateway.amazonaws.com"
#  source_arn = "arn:aws:execute-api:ap-northeast-1:${var.names.account_id}:${aws_api_gateway_rest_api.EB.id}/*/GET/eb/*/${aws_api_gateway_resource.ip.path_part}/*"
#}