36 lines
954 B
TypeScript
36 lines
954 B
TypeScript
export type JwtPayload = {
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account_id?: number
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username?: string
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exp?: number
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iat?: number
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nbf?: number
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[key: string]: unknown
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}
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function base64UrlToBase64(input: string) {
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const base64 = input.replace(/-/g, '+').replace(/_/g, '/')
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const pad = base64.length % 4
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return pad === 0 ? base64 : base64 + '='.repeat(4 - pad)
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}
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function base64ToUtf8String(base64: string) {
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const binary = atob(base64)
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const bytes = new Uint8Array(binary.length)
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for (let i = 0; i < binary.length; i += 1) bytes[i] = binary.charCodeAt(i)
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return new TextDecoder().decode(bytes)
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}
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export function decodeJwtPayload(token: string): JwtPayload | null {
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const [, payload] = token.split('.')
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if (!payload) return null
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try {
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const json = base64ToUtf8String(base64UrlToBase64(payload))
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const parsed = JSON.parse(json)
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if (!parsed || typeof parsed !== 'object') return null
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return parsed as JwtPayload
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} catch {
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return null
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}
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}
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