Unable to access NODE_ENV or ARCJET_ENV from Gatsby

[davidmytton]

If you use Arcjet within a Gatsby function, the Arcjet client does not pick up any environment variables.

This means that when running locally, it will always log the ✦Aj WARN Client IP address is missing. If this is a dev environment set the ARCJET_ENV env var to "development" warning and fail to build the characteristics with ✦Aj ERROR Failed to build fingerprint. Please verify your Characteristics. because it can't find a valid IP address.

I am able to access the environment variables from within the function so I can set process.env.ARCJET_KEY with a normal instantiation of the client. I tried placing the client inside and outside of the handler, but it still seems unable to detect the environment variables. A console.log shows they are all set.

As a workaround I can hard code the local IP if we detect we're in development:

const ip = process.env.NODE_ENV === 'development' ? '1.1.1.1' : undefined;
const decision = await aj.protect(ip ? { ...req, socket: { remoteAddress: ip } } : req);

Here's a simple Gatsby function demonstrating the issue. It can be placed in src/api/arcjet.ts to be accessed from http://localhost:8000/api/arcjet

import arcjet, { slidingWindow } from "@arcjet/node";
import type { GatsbyFunctionRequest, GatsbyFunctionResponse } from 'gatsby';

const aj = arcjet({
    key: process.env.ARCJET_KEY!,
    rules: [
        slidingWindow({
            mode: "LIVE",
            interval: "10m",
            max: 500,
        }),
    ],
});

const handler = async (
    req: GatsbyFunctionRequest,
    res: GatsbyFunctionResponse
) => {
    const decision = await aj.protect(req);
    console.log("IP Address", req.socket.remoteAddress);
    console.log("Arcjet ENV", process.env.ARCJET_ENV);

    return res.json({ arcjet: decision });
}


export default handler;

The output is:

warn ✦Aj WARN Client IP address is missing. If this is a dev environment set the ARCJET_ENV env var to "development"
Executed function "/api/arcjet" in 5ms

 ERROR  UNKNOWN

✦Aj ERROR Failed to build fingerprint. Please verify your Characteristics.
      error: {}

IP Address ::1
Arcjet ENV development