How Do I Configure an AWS API Gateway REST API?

Introduction

This guide provides a comprehensive walkthrough on configuring an AWS API Gateway REST API using Pulumi with TypeScript. The purpose is to help you establish a basic API Gateway structure, including defining the API, creating resources, and setting up methods. This is essential for deploying a functional API that can be accessed over the internet.

Step-by-Step Configuration

To set up an AWS API Gateway REST API, follow these steps:

1. Define the API Gateway REST API: Start by creating the main API object that will manage your resources and methods.

2. Create a Resource (Endpoint): Define a resource within the API, which acts as an endpoint. In this example, the resource path is /example.

3. Define a Method for the Resource: Specify an HTTP method (e.g., GET) for the resource. This determines how the API can be accessed.

4. Define a Method Response: Set up a response for the method, which specifies the status code and any response parameters.

5. Create the API Gateway Deployment: Deploy the API by creating a deployment object and specifying a stage name (e.g., “dev”).

6. Export the API Endpoint URL: Finally, export the API endpoint URL for accessing the deployed API.

Here is the complete code example for setting up the API:

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// Define the API Gateway REST API
const exampleApi = new aws.apigateway.RestApi("example_api", {
    name: "example-rest-api",
    description: "Example API Gateway REST API",
});

// Create a resource (endpoint) within the API
const exampleResource = new aws.apigateway.Resource("example_resource", {
    restApi: exampleApi.id,
    parentId: exampleApi.rootResourceId,
    pathPart: "example",
});

// Define a method for the resource
const exampleMethod = new aws.apigateway.Method("example_method", {
    restApi: exampleApi.id,
    resourceId: exampleResource.id,
    httpMethod: "GET",
    authorization: "NONE",
});

// Define a method response
const exampleMethodResponse = new aws.apigateway.MethodResponse("example_method_response", {
    restApi: exampleMethod.restApi,
    resourceId: exampleMethod.resourceId,
    httpMethod: exampleMethod.httpMethod,
    statusCode: "200",
});

// Define the API Gateway deployment
const exampleDeployment = new aws.apigateway.Deployment("example_deployment", {
    restApi: exampleApi.id,
    stageName: "dev",
});

export const apiEndpoint = pulumi.interpolate`${exampleDeployment.invokeUrl}/example`;

Key Points

• API Definition: The API is defined using aws.apigateway.RestApi.
• Resource Creation: Resources are created under the API to define endpoints.
• Method Specification: Methods like GET are defined for resource interaction.
• Deployment: The API is deployed to a stage, making it accessible.
• Endpoint Export: The endpoint URL is exported for easy access.

Conclusion

By following these steps, you can successfully configure an AWS API Gateway REST API using Pulumi. This setup provides a foundational structure for creating more complex APIs as your project evolves. Ensure to customize each component to fit your specific needs and security requirements.