golang-oauth2-example

A basic example using golang to complete the OAuth 2 flow on Xero's API without the use of an SDK.

Running this app

The first thing you'll need is the client ID and client secret from your application.

Copy config.example.yml to a new file called config.yml. The two most important fields we need to change in config.yml are the client_id, and client_secret.

You can run this in two ways: Docker, or natively with the go binary on your machine.

There are also some environment variables that can be set to alter the behaviour of the application:

• DEBUG - If set to true, will output more information, including auth tokens and some API response bodies.
• APP_PORT - Docker Compose only: Will tell Docker Compose to expose the service on the given port. Defaults to 8000.

With Docker (recommended)

After installing Docker, run docker-compose up --build in this directory.

The application should go through its initial build process, then start.

With Go

This was written with version 1.14.3 - Your mileage may vary with other versions.

What it Does

This uses the oauth2 library to handle the client calls.

It also spawns a small HTTP server on localhost:8000 in order to receive the data back from the Xero API once the user has authorised it.

Production Considerations

Before you go copying and pasting parts of this implementation into your production codebase, you may want to consider:

• Some kind of storage mechanism for tokens - Whether that be a database, or in-memory key/value store.
• A solution for a proper UI - Or maybe convert this into a microservice that spits out JSON.
• Injecting the xero-tenant-id header value via the HTTP client RoundTripper (https://stackoverflow.com/a/51629379) if your architecture allows.
• The struct models in the xero/ directory are incomplete.
• Jordan's written most of the code
• References to localhost are hardcoded in several places. Might need to remove those.