learn-request-queue/src/twitch.ts

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import * as config from "./config";
import fetch, { Response as FetchResponse } from "node-fetch";
export interface TokenPair {
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access_token: string;
refresh_token: string;
}
// Refresh the API token. Returns true on success and false on failure.
async function refreshApiToken(tokens: TokenPair): Promise<boolean> {
return fetch("https://id.twitch.tv/oauth2/token", {
method: 'POST',
body: new URLSearchParams({
client_id: config.twitchClientId,
client_secret: config.twitchSecret,
grant_type: "refresh_token",
refresh_token: tokens.refresh_token
})
}).then(async (res: FetchResponse) => {
if (res.status == 200) {
var data = await (res.json() as Promise<TokenPair>);
console.log(data)
tokens.access_token = data.access_token;
tokens.refresh_token = data.refresh_token;
return true;
} else {
return false;
}
})
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}
// Send an API request. On success, return the specified data. On failure,
// attempt to refresh the API token and retry
export async function apiRequest(tokens: TokenPair, endpoint: string): Promise <any> {
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var headers = {
"Authorization": "Bearer " + tokens.access_token,
"Client-ID": config.twitchClientId
};
return fetch("https://api.twitch.tv/helix" + endpoint, { headers: headers })
.then((res: FetchResponse) => {
if (res.status == 200) {
return res.json();
} else {
if (refreshApiToken(tokens)) {
return fetch("https://api.twitch.tv/helix" + endpoint, { headers: headers })
.then((res: FetchResponse) => {
if (res.status == 200) {
return res.json();
} else {
return false;
}
})
} else {
return false;
}
}
})
}
// Check if API token is valid. Checks Twitch's OAuth validation endpoint. If
// success, return true. If failure, return the result of attempting to refresh
// the API token.
export async function isApiTokenValid(tokens: TokenPair) {
return fetch("https://id.twitch.tv/oauth2/validate", {
headers: {'Authorization': `OAuth ${tokens.access_token}`}
}).then((res: FetchResponse) => {
if (res.status == 200) {
return true;
} else {
return refreshApiToken(tokens);
}
})
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}