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The receipt keypair is SEPARATE from the\n// license keypair: helmActivate holds the receipt *private* key and the client embeds\n// the matching receipt *public* key (runtime-config.js). If HELM_RECEIPT_PRIVATE_KEY\n// is unset, no receipt is issued (rollout-safe; the client falls back to legacy\n// offline grace until both sides are configured).\nimport { blob } from \"https://esm.town/v/std/blob\";\nimport {\n createHash,\n createPrivateKey,\n createPublicKey,\n KeyObject,\n sign as cryptoSign,\n verify as cryptoVerify,\n} from \"node:crypto\";\n\n// ── Activation receipt (SF-2) ─────────────────────────────────────────────────\n// 60-day TTL; the client refreshes it on every successful online re-verify, so a\n// machine that stays online keeps a fresh receipt and a machine offline longer than\n// the TTL must reconnect once. Format: ..\nconst RECEIPT_TTL_SEC = 60 * 24 * 60 * 60;\nfunction issueReceipt(\n keyFp: string,\n machineId: string,\n priv: KeyObject,\n): string {\n const payload = JSON.stringify({\n k: keyFp,\n m: machineId,\n exp: Math.floor(Date.now() / 1000) + RECEIPT_TTL_SEC,\n });\n const payloadBytes = Buffer.from(payload, \"utf8\");\n const sig = cryptoSign(null, payloadBytes, priv).toString(\"base64url\");\n return `${payloadBytes.toString(\"base64url\")}.${sig}`;\n}\n\n// ── Rate limiting ─────────────────────────────────────────────────────────────\nconst WINDOW_MS = 15 * 60 * 1000;\nconst MAX_ATTEMPTS = 15;\n\nasync function rateLimit(req: Request): Promise {\n const ip = req.headers.get(\"x-forwarded-for\")?.split(\",\")[0].trim() ??\n \"unknown\";\n // Bucket key uses the same WINDOW_MS as the in-bucket sliding reset so the\n // two time constants agree — \"MAX_ATTEMPTS per WINDOW_MS\" means exactly that.\n const windowBucket = Math.floor(Date.now() / WINDOW_MS);\n const ipHash = createHash(\"sha256\").update(ip).digest(\"hex\").slice(0, 12);\n const blobKey = `helm_rl_${windowBucket}_${ipHash}`;\n const now = Date.now();\n\n let record: { count: number; windowStart: number; v: number } =\n (await blob.getJSON(blobKey)) ?? { count: 0, windowStart: now, v: now };\n\n if (now - record.windowStart > WINDOW_MS) {\n record = { count: 0, windowStart: now, v: now };\n }\n\n if (record.count >= MAX_ATTEMPTS) {\n return Response.json({ ok: false, reason: \"rate_limited\" }, {\n status: 429,\n });\n }\n\n record.count++;\n const fresh: typeof record | null = await blob.getJSON(blobKey);\n\n if (fresh && fresh.v !== record.v) {\n const freshCount = fresh.count ?? 0;\n if (freshCount >= MAX_ATTEMPTS) {\n return Response.json({ ok: false, reason: \"rate_limited\" }, {\n status: 429,\n });\n }\n await blob.setJSON(blobKey, {\n count: freshCount + 1,\n windowStart: fresh.windowStart ?? now,\n v: Date.now(),\n });\n } else {\n await blob.setJSON(blobKey, {\n count: record.count,\n windowStart: record.windowStart,\n v: Date.now(),\n });\n }\n\n return null;\n}\n\n// ── PEM normalization ─────────────────────────────────────────────────────────\n// Env-var UIs (Val.town included) often flatten a multi-line PEM into one line\n// or insert literal \"\\n\" — both of which createPublicKey rejects. Rebuild a\n// canonical PEM from whatever survived, so the key loads regardless of mangling.\nfunction normalizePem(raw: string, label: string): string {\n const body = String(raw)\n .replace(/\\\\[nrt]/g, \"\")\n .replace(/-----BEGIN [^-]+-----/g, \"\")\n .replace(/-----END [^-]+-----/g, \"\")\n .replace(/[^A-Za-z0-9+/=]/g, \"\");\n const wrapped = body.match(/.{1,64}/g)?.join(\"\\n\") ?? \"\";\n return `-----BEGIN ${label}-----\\n${wrapped}\\n-----END ${label}-----\\n`;\n}\n\n// ── Key verification ──────────────────────────────────────────────────────────\n// Key format: HLM....\n// '.' is not a base64url character, so split is unambiguous.\nfunction verifyKey(\n key: string,\n publicKey: KeyObject,\n): { valid: boolean; email: string | null } {\n try {\n const parts = key.split(\".\");\n if (parts.length !== 4 || parts[0] !== \"HLM\") {\n return { valid: false, email: null };\n }\n const [, encodedEmail, nonce, signature] = parts;\n if (!encodedEmail || !nonce || !signature) {\n return { valid: false, email: null };\n }\n const message = Buffer.from(`HLM:${encodedEmail}:${nonce}`);\n const sig = Buffer.from(signature, \"base64url\");\n const ok = cryptoVerify(null, message, publicKey, sig);\n if (!ok) return { valid: false, email: null };\n const email = Buffer.from(encodedEmail, \"base64url\").toString(\"utf8\");\n return { valid: true, email };\n } catch {\n return { valid: false, email: null };\n }\n}\n\n// ── Input validation ──────────────────────────────────────────────────────────\n// key format: HLM--<8 hex>-<64 hex> — max ~200 chars in practice\nconst KEY_MAX = 300;\nconst MACHINE_MAX = 64;\nconst BODY_SIZE_MAX = 2048; // bytes\n\nfunction isSafeKey(k: unknown): k is string {\n // HLM..<8 hex nonce>.<86-char base64url Ed25519 sig>.\n return typeof k === \"string\" && k.length >= 10 && k.length <= KEY_MAX &&\n /^HLM\\.[A-Za-z0-9_-]+\\.[0-9a-f]{8}\\.[A-Za-z0-9_-]{86}$/.test(k);\n}\n\nfunction isSafeMachineId(m: unknown): m is string {\n return typeof m === \"string\" && m.length >= 4 && m.length <= MACHINE_MAX &&\n /^[0-9a-f]+$/.test(m);\n}\n\n// ── Handler ───────────────────────────────────────────────────────────────────\nexport default async function (req: Request): Promise {\n if (req.method !== \"POST\") {\n return new Response(\"Method Not Allowed\", { status: 405 });\n }\n\n // Reject oversized bodies before reading\n const contentLength = parseInt(req.headers.get(\"content-length\") ?? \"0\", 10);\n if (contentLength > BODY_SIZE_MAX) {\n return Response.json({ ok: false, reason: \"payload_too_large\" }, {\n status: 413,\n });\n }\n\n const limited = await rateLimit(req);\n if (limited) return limited;\n\n const publicPem = Deno.env.get(\"HELM_LICENSE_PUBLIC_KEY\") ?? \"\";\n if (!publicPem) {\n return Response.json({ ok: false, reason: \"server_misconfigured\" }, {\n status: 500,\n });\n }\n let publicKey: KeyObject;\n try {\n publicKey = createPublicKey(normalizePem(publicPem, \"PUBLIC KEY\"));\n } catch {\n return Response.json({ ok: false, reason: \"server_misconfigured\" }, {\n status: 500,\n });\n }\n\n let body: { key?: unknown; machineId?: unknown };\n try {\n const raw = await req.text();\n if (raw.length > BODY_SIZE_MAX) {\n return Response.json({ ok: false, reason: \"payload_too_large\" }, {\n status: 413,\n });\n }\n body = JSON.parse(raw);\n } catch {\n return Response.json({ ok: false, reason: \"bad_request\" }, { status: 400 });\n }\n\n const { key, machineId } = body;\n if (!isSafeKey(key)) {\n return Response.json({ ok: false, reason: \"invalid_key\" }, { status: 400 });\n }\n if (!isSafeMachineId(machineId)) {\n return Response.json({ ok: false, reason: \"invalid_machine\" }, {\n status: 400,\n });\n }\n\n const { valid, email } = verifyKey(key, publicKey);\n if (!valid) {\n return Response.json({ ok: false, reason: \"invalid_key\" }, { status: 403 });\n }\n\n // Load the receipt signing key (optional during rollout). The receipt fingerprint\n // matches the client's keyFingerprint() = sha256(key)[:16].\n const keyFp = createHash(\"sha256\").update(key).digest(\"hex\").slice(0, 16);\n let receiptKey: KeyObject | null = null;\n const receiptPem = Deno.env.get(\"HELM_RECEIPT_PRIVATE_KEY\") ?? \"\";\n if (receiptPem) {\n try {\n receiptKey = createPrivateKey(normalizePem(receiptPem, \"PRIVATE KEY\"));\n } catch {\n receiptKey = null;\n }\n }\n const receiptFor = (\n m: string,\n ) => (receiptKey ? issueReceipt(keyFp, m, receiptKey) : undefined);\n\n const activationKey = \"helm_activation_\" + keyFp;\n\n const existing: { machines: string[] } =\n (await blob.getJSON(activationKey)) ?? { machines: [] };\n\n if (existing.machines.includes(machineId)) {\n return Response.json({ ok: true, email, receipt: receiptFor(machineId) });\n }\n\n if (existing.machines.length >= 2) {\n return Response.json({ ok: false, reason: \"limit_reached\" }, {\n status: 403,\n });\n }\n\n const recheck: { machines: string[] } 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Code