24 lines
999 B
TypeScript
24 lines
999 B
TypeScript
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import crypto from "crypto"
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// Signed OAuth `state` (HMAC-SHA256) — carries the initiating owner + provider
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// and is tamper-proof, so the callback can't be forged/CSRF'd.
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const SECRET = process.env.BETTER_AUTH_SECRET ?? "dev-secret"
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export function signState(data: { ownerId: string; provider: string }): string {
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const payload = Buffer.from(JSON.stringify(data)).toString("base64url")
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const sig = crypto.createHmac("sha256", SECRET).update(payload).digest("base64url")
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return `${payload}.${sig}`
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}
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export function verifyState(state: string): { ownerId: string; provider: string } | null {
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const [payload, sig] = state.split(".")
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if (!payload || !sig) return null
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const expect = crypto.createHmac("sha256", SECRET).update(payload).digest("base64url")
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if (sig.length !== expect.length || !crypto.timingSafeEqual(Buffer.from(sig), Buffer.from(expect))) return null
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try {
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return JSON.parse(Buffer.from(payload, "base64url").toString("utf8"))
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} catch {
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return null
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}
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}
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