nandi.uk
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1export const isTokenExpiringSoon = (
2 token: string | null | undefined,
3): boolean => {
4 if (!token) return true;
5
6 const bufferSeconds = parseInt(
7 process.env.NEXT_PUBLIC_ACCESS_TOKEN_EXPIRY_BUFFER_SECONDS || '300',
8 10,
9 );
10
11 try {
12 // Validate JWT structure first
13 const parts = token.split('.');
14 if (parts.length !== 3) return true;
15
16 const payload = JSON.parse(Buffer.from(parts[1], 'base64').toString());
17
18 // Ensure exp claim exists and is a number
19 if (!payload.exp || typeof payload.exp !== 'number') return true;
20
21 const expiry = payload.exp * 1000;
22 const bufferTime = bufferSeconds * 1000;
23 return Date.now() >= expiry - bufferTime;
24 } catch {
25 return true;
26 }
27};