Helper script to refresh OAuth2 tokens for Gmail test accounts.

npm install googleapis
node scripts/refresh-test-tokens.js

1. Prompts you to select which test account(s) to refresh
2. Generates an OAuth2 authorization URL for each account
3. Starts a local web server on port 3000 to receive the OAuth callback
4. Opens your browser to authenticate with Google
5. Exchanges the authorization code for new access and refresh tokens
6. Automatically updates the .env file with the new refresh tokens

• googleapis package (installed as dev dependency)
• .env file with the following variables:

Full access accounts (gmail.modify scope):

• GMAIL_API_CLIENT_ID
• GMAIL_API_CLIENT_SECRET
• GMAIL_API_ACCOUNT_EMAIL_1
• GMAIL_API_ACCOUNT_REFRESH_1
• GMAIL_API_ACCOUNT_EMAIL_2
• GMAIL_API_ACCOUNT_REFRESH_2

Send-only account (gmail.send scope only):

• GMAIL_SENDONLY_CLIENT_ID
• GMAIL_SENDONLY_CLIENT_SECRET
• GMAIL_SENDONLY_ACCOUNT_EMAIL
• GMAIL_SENDONLY_ACCOUNT_REFRESH

• The script requests offline access to get refresh tokens
• It uses prompt=consent to ensure a new refresh token is issued
• The OAuth redirect URI is set to http://127.0.0.1:3000/oauth
• Make sure port 3000 is available before running the script
• The script binds to 127.0.0.1 (not 0.0.0.0) for security