Setting Up Cross-Origin Resource Sharing (CORS) on GCP Storage Buckets

In this guide, we’ll configure Cross-Origin Resource Sharing (CORS) on Google Cloud Platform (GCP) Storage Buckets using Pulumi in TypeScript. CORS is a security feature that permits web applications from one domain to access resources in another domain. By setting up CORS on GCP Storage Buckets, you can specify which domains are allowed to access the resources stored in your buckets.

Step-by-Step Explanation

Step 1: Install Pulumi and GCP Plugin

First, ensure that you have Pulumi installed on your machine. You can install Pulumi using npm:

npm install -g pulumi

Next, install the Pulumi GCP plugin:

pulumi plugin install resource gcp v6.0.0

Step 2: Create a New Pulumi Project

Create a new Pulumi project by running the following command and following the prompts:

pulumi new typescript

Step 3: Configure GCP Authentication

Ensure that you have authenticated with GCP using the gcloud CLI:

gcloud auth login

Set the project and region for your Pulumi stack:

pulumi config set gcp:project <your-gcp-project-id>
pulumi config set gcp:region <your-gcp-region>

Step 4: Create a GCP Storage Bucket with CORS Configuration

In your Pulumi program, create a new GCP Storage Bucket and include the CORS configuration directly in the bucket creation step:

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

const bucket = new gcp.storage.Bucket("my-bucket", {
    location: "US",
    cors: [{
        origins: ["http://example.com"],
        methods: ["GET", "HEAD"],
        responseHeaders: ["Content-Type"],
        maxAgeSeconds: 3600,
    }],
});

export const bucketName = bucket.name;

Step 5: Deploy the Pulumi Stack

Deploy the Pulumi stack to apply the changes:

pulumi up

Key Points

• CORS allows web applications from one domain to access resources in another domain.
• Pulumi is used to manage infrastructure as code, making it easy to configure and deploy resources on GCP.
• The GCP Storage Bucket is configured with CORS settings to control access from specified domains.

Conclusion

By following these steps, you have successfully set up Cross-Origin Resource Sharing (CORS) on a GCP Storage Bucket using Pulumi in TypeScript. This configuration allows you to control which domains can access the resources in your bucket, enhancing the security of your web applications.

Full Code Example

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

const bucket = new gcp.storage.Bucket("my-bucket", {
    location: "US",
    cors: [{
        origins: ["http://example.com"],
        methods: ["GET", "HEAD"],
        responseHeaders: ["Content-Type"],
        maxAgeSeconds: 3600,
    }],
});

export const bucketName = bucket.name;