minimal access-token generator (with AWS-lambda & Claudia.js)

claudia.json

{
  "lambda": {
    "role": "web-api-test-executor",
    "name": "web-api-test",
    "region": "us-east-1"
  },
  "api": {
    "id": "rtvnonbl58",
    "module": "web"
  }
}

index.js

/**
 * Copy/Paste this into new AWS Lambda console and set you Forge key/secret below
 * RESULT: Returns Tandem Access-token via js script file
 * INCLUDE: <script src="https://xxx.lambda-url.us-west-2.on.aws"></script> in your index.html
 * NOTE: Lambda Runtime must be Node v18+
 */
exports.handler = async (event) => {
    const url = `https://developer.api.autodesk.com/authentication/v1/authenticate`;
    const header = { 'Content-Type': 'application/x-www-form-urlencoded' }
	const body = `grant_type=client_credentials&client_id=xxx&client_secret=xxx&scope=data:read`;
    const json = await (await fetch( url, { method: 'POST', headers: header, body: body })).json();
    
    const response = {
        statusCode: 200,
        headers: {
            'Content-Type': 'text/html',
        },
        body: `var _access_token = "${ json.access_token }";`
    };
    return response;
};

package.json

{
  "name": "web-api-test",
  "description": "Simple example that shows how to create WEB apis",
  "private": true,
  "files": [
    "*.js"
  ],
  "scripts": {
    "start": "claudia create --name web-api-test --region us-east-1 --api-module web",
    "deploy": "claudia update"
  },
  "devDependencies": {
    "claudia": "^5"
  },
  "dependencies": {
    "claudia-api-builder": "^4",
    "node-fetch": "^2.6.1",
  },
  "version": "1.0.0",
  "main": "web.js",
  "license": "MIT"
}

web.js

// To install:
// 1. download the three files (web.js, package.json, claudia.js) locally
//   > npm install
// 2. install claudia via https://github.com/claudiajs/example-projects/tree/master/web-serving-html
// 3. update the forge-client and secret in line 12: web.js

// To run:
// > claudia update
// 
// Result: 
// https://6jm6lvl74k.execute-api.us-west-2.amazonaws.com/latest/_adsk.js
//

// based on claudia web.js sample:
// https://github.com/claudiajs/example-projects/tree/master/web-serving-html
//
const fetch = require('node-fetch');
const ApiBuilder = require('claudia-api-builder');
const api = new ApiBuilder();

const url = `https://developer.api.autodesk.com/authentication/v1/authenticate`;
const header = { 'Content-Type': 'application/x-www-form-urlencoded' }

api.get('/_adsk.js', async () => {
	const body = `grant_type=client_credentials&client_id=xxxx&client_secret=xxxx&scope=data:read`;
    let token = await fetch( url, { method: 'POST', headers: header, body: body });
    token = await token.json();
	return `var _access_token = "${ token.access_token }";`;
},{
  success: { contentType: 'text/html; charset=utf-8' }, 
  error: {code: 403}
});

module.exports = api;