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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138import type { InstallationConfig } from "../configuration/customer.ts";import type { Secret } from "../configuration/secrets.ts";
export const SESSION_COOKIE = "__Host-flarebot-session";const MAX_SESSION_SECONDS = 8 * 60 * 60;const encoder = new TextEncoder();
interface OwnerSession { version: 1; subject: string; installationId: string; audience: string; issuedAt: number; expiresAt: number;}
function encode(bytes: Uint8Array): string { return btoa(String.fromCharCode(...bytes)) .replaceAll("+", "-") .replaceAll("/", "_") .replace(/=+$/, "");}
function decode(value: string): Uint8Array<ArrayBuffer> { if (!/^[A-Za-z0-9_-]+$/.test(value)) throw new Error("Invalid encoding"); return Uint8Array.from( atob(value.replaceAll("-", "+").replaceAll("_", "/")), (c) => c.charCodeAt(0), );}
function key(secret: Secret) { return crypto.subtle.importKey( "raw", encoder.encode(secret.reveal()), { name: "HMAC", hash: "SHA-256" }, false, ["sign", "verify"], );}
// Server-only seam for the future verified OAuth bridge. The caller must first// establish ownership; this function is never exposed as an HTTP/RPC login.export async function createOwnerSession( secret: Secret, installation: InstallationConfig,): Promise<string> { const issuedAt = Math.floor(Date.now() / 1000); const payload: OwnerSession = { version: 1, subject: installation.ownerSubject, installationId: installation.installationId, audience: installation.runtimeOrigin, issuedAt, expiresAt: issuedAt + MAX_SESSION_SECONDS, }; const body = encode(encoder.encode(JSON.stringify(payload))); const signature = await crypto.subtle.sign( "HMAC", await key(secret), encoder.encode(body), ); return `${SESSION_COOKIE}=${body}.${encode(new Uint8Array(signature))}; Path=/; HttpOnly; Secure; SameSite=Lax; Max-Age=${MAX_SESSION_SECONDS}`;}
export async function verifyOwnerSession( request: Request, secret: Secret, installation: InstallationConfig,): Promise<OwnerSession | null> { const cookies = (request.headers.get("Cookie") ?? "") .split(";") .map((cookie) => cookie.trim()) .filter((cookie) => cookie.startsWith(`${SESSION_COOKIE}=`)); if (cookies.length !== 1) return null; const token = cookies[0].slice(SESSION_COOKIE.length + 1); if (token.length > 4096) return null; try { const parts = token.split("."); if (parts.length !== 2) return null; const [body, signature] = parts; if ( !(await crypto.subtle.verify( "HMAC", await key(secret), decode(signature), encoder.encode(body), )) ) return null; const session: OwnerSession = JSON.parse( new TextDecoder().decode(decode(body)), ); const now = Math.floor(Date.now() / 1000); if ( session.version !== 1 || session.subject !== installation.ownerSubject || session.installationId !== installation.installationId || session.audience !== new URL(request.url).origin || !Number.isSafeInteger(session.issuedAt) || !Number.isSafeInteger(session.expiresAt) || session.issuedAt > now || session.expiresAt <= now || session.expiresAt <= session.issuedAt || session.expiresAt - session.issuedAt > MAX_SESSION_SECONDS ) return null; return session; } catch { return null; }}
export function privateResponse(message: string, status: number): Response { return new Response(message, { status, headers: { "Cache-Control": "no-store" }, });}
export async function authorizeRuntimeRequest( request: Request, secret: Secret, installation: InstallationConfig,): Promise<Response | null> { if (new URL(request.url).origin !== installation.runtimeOrigin) return privateResponse("Forbidden", 403); const origin = request.headers.get("Origin"); const needsOrigin = request.headers.get("Upgrade")?.toLowerCase() === "websocket" || !["GET", "HEAD"].includes(request.method); if ((needsOrigin || origin !== null) && origin !== installation.runtimeOrigin) return privateResponse("Forbidden", 403); return (await verifyOwnerSession(request, secret, installation)) ? null : privateResponse("Authentication required", 401);}