feat: Add OAuth token encryption and decryption functions (#79)

* Add @types/node as a dev dependency

* Add encryption module

* Export from index

* Change crypto import

* Move to new package

* Undo embed-sdk dev dependency

* Update pnpm-lock

* Update readme

* Another readme revision

* Update function definitions

* Crypto import

* Clean up tsup.config.js

* Add changeset

Author: ColinGreybosh

.changeset/friendly-files-train.md

@@ -0,0 +1,5 @@
+---
+"@sigmacomputing/node-embed-sdk": minor
+---
+
+Add OAuth token encryption utils for JWT embeds

packages/node-embed-sdk/.eslintrc.js

@@ -0,0 +1,10 @@
+/** @type {import("eslint").Linter.Config} */
+module.exports = {
+  root: true,
+  extends: ["@sigmacomputing/eslint-config/react-internal.js"],
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    project: "./tsconfig.lint.json",
+    tsconfigRootDir: __dirname,
+  },
+};

packages/node-embed-sdk/README.md

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+# Sigma Node.js Embed SDK
+
+This package provides Node.js utilities for working with Sigma Computing's Embed API.
+
+## Getting Started
+
+To use the node-embed-sdk in your project, you can install it using your node package manager.
+
+**Using npm:**
+
+```code
+npm install @sigmacomputing/node-embed-sdk
+```
+
+**yarn:**
+
+```code
+yarn add @sigmacomputing/node-embed-sdk
+```
+
+**pnpm:**
+
+```code
+pnpm add @sigmacomputing/node-embed-sdk
+```
+
+## Features
+
+### Token Encryption and Decryption
+
+The SDK provides utilities for encrypting and decrypting OAuth tokens using AES-256-GCM encryption:
+
+```typescript
+import { encrypt, decrypt } from '@sigmacomputing/node-embed-sdk';
+
+// Encrypt an OAuth token
+const encryptedToken = encrypt(
+  'your-embed-secret',
+  'your-oauth-token'
+);
+
+// Decrypt an encrypted token
+const decryptedToken = decrypt(
+  'your-embed-secret',
+  encryptedToken
+);
+```

packages/node-embed-sdk/package.json

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+{
+  "name": "@sigmacomputing/node-embed-sdk",
+  "author": "sigmacomputing",
+  "version": "0.1.0",
+  "description": "Node.js SDK for Sigma Computing with encryption/decryption utilities",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/sigmacomputing/embed-sdk.git",
+    "directory": "packages/node-embed-sdk"
+  },
+  "homepage": "https://sigmacomputing.com",
+  "bugs": {
+    "url": "https://github.com/sigmacomputing/embed-sdk/issues"
+  },
+  "keywords": [
+    "embed",
+    "sdk",
+    "sigma",
+    "node"
+  ],
+  "scripts": {
+    "prepublish": "turbo run build",
+    "build": "tsup",
+    "lint": "eslint . --ext .ts",
+    "watch": "tsup --watch",
+    "typecheck": "tsc --noEmit",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "main": "./dist/index.js",
+  "module": "./dist/index.mjs",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    "import": {
+      "import": "./dist/index.mjs",
+      "types": "./dist/index.d.mts"
+    },
+    "require": {
+      "require": "./dist/index.js",
+      "types": "./dist/index.d.ts"
+    }
+  },
+  "files": [
+    "dist"
+  ],
+  "devDependencies": {
+    "@sigmacomputing/eslint-config": "workspace:*",
+    "@sigmacomputing/typescript-config": "workspace:*",
+    "@types/node": "^20.17.16"
+  },
+  "engines": {
+    "node": ">=18"
+  }
+}