Auto-refreshing tokens
For auto refreshing to work reliably, you need to persist your current access/refresh token pair and the token expiry timestamp in some way.
This example uses files to make it easily understandable, but you should probably use a database or similar, especially if you need to fetch data for more than one user.
It also assumes that you pre-populated this file (in this example named tokens.json) with some data:
{
"accessToken": "INITIAL_ACCESS_TOKEN",
"refreshToken": "INITIAL_REFRESH_TOKEN",
"expiryTimestamp": 0
}
Note that expiryTimestamp is set to 0, which forces the application to make a refresh call the first time you start it.
This is done to prevent having to calculate the initial expiry timestamp manually.
import { RefreshableAuthProvider, StaticAuthProvider } from 'twitch-auth';
import { promises as fs } from 'fs';
const clientId = 'YOUR_CLIENT_ID';
const clientSecret = 'YOUR_CLIENT_SECRET';
const tokenData = JSON.parse(await fs.readFile('./tokens.json', 'UTF-8'));
const authProvider = new RefreshableAuthProvider(
new StaticAuthProvider(clientId, tokenData.accessToken),
{
clientSecret,
refreshToken: tokenData.refreshToken,
expiry: tokenData.expiryTimestamp === null ? null : new Date(tokenData.expiryTimestamp),
onRefresh: async ({ accessToken, refreshToken, expiryDate }) => {
const newTokenData = {
accessToken,
refreshToken,
expiryTimestamp: expiryDate === null ? null : expiryDate.getTime()
};
await fs.writeFile('./tokens.json', JSON.stringify(newTokenData, null, 4), 'UTF-8')
}
}
);