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decap-stream/src/lib/auth.ts
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// Edge-compatible — no Node.js imports here (used in middleware)
export const AUTH_ENABLED = !!(process.env.AUTH_USER && process.env.AUTH_PASS)
export const COOKIE_NAME = "ds_session"
// HMAC-SHA256(user, key=pass) — deterministic, no in-memory state, survives restarts
// Works in both Edge (SubtleCrypto) and Node.js runtime
export async function computeSessionToken(): Promise<string> {
const user = process.env.AUTH_USER ?? ""
const pass = process.env.AUTH_PASS ?? ""
const enc = new TextEncoder()
const key = await globalThis.crypto.subtle.importKey(
"raw", enc.encode(pass),
{ name: "HMAC", hash: "SHA-256" },
false, ["sign"]
)
const sig = await globalThis.crypto.subtle.sign("HMAC", key, enc.encode(user))
return Array.from(new Uint8Array(sig), b => b.toString(16).padStart(2, "0")).join("")
}