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The same construction lives in the iOS app (Activation.swift) and\n// tools/mint-keys.py — all three must agree byte-for-byte or keys won't verify.\n//\n// The secret here is this app's own. The Wise clone has a different one, so\n// neither app's keys open the other.\n\nimport { sqlite } from \"https://esm.town/v/std/sqlite/main.ts\";\n\n// No 0/O/1/I — the pairs people mistype when copying a key.\nexport const ALPHABET = \"ABCDEFGHJKLMNPQRSTUVWXYZ23456789\";\n\n// Seconds each tier grants. T is a 60-second tier for watching expiry happen;\n// L is a hundred-year grant — \"lifetime\" in practice.\nexport const DURATION: Record = { D: 86400, W: 604800, M: 2592000, T: 60, L: 3153600000 };\nexport const TIER_LABEL: Record = { D: \"1 day\", W: \"7 days\", M: \"1 month\", T: \"60 seconds\", L: \"Lifetime\" };\n\nexport async function initDb(): Promise {\n await sqlite.execute(`CREATE TABLE IF NOT EXISTS revolut_claims (\n serial TEXT PRIMARY KEY,\n tier TEXT NOT NULL,\n device_id TEXT NOT NULL,\n claimed_at TEXT NOT NULL,\n expires_at TEXT NOT NULL,\n revoked INTEGER NOT NULL DEFAULT 0\n )`);\n}\n\n/** First 50 bits of HMAC-SHA256(payload), as ten five-bit characters. */\nexport async function tag(payload: string, secret: string): Promise {\n const key = await crypto.subtle.importKey(\n \"raw\", new TextEncoder().encode(secret),\n { name: \"HMAC\", hash: \"SHA-256\" }, false, [\"sign\"],\n );\n const mac = new Uint8Array(await crypto.subtle.sign(\"HMAC\", key, new TextEncoder().encode(payload)));\n let out = \"\", acc = 0, bits = 0, i = 0;\n while (out.length < 10) {\n if (bits < 5) { acc = (acc << 8) | mac[i]; bits += 8; i += 1; }\n out += ALPHABET[(acc >> (bits - 5)) & 0b11111];\n bits -= 5;\n }\n return out;\n}\n\n/** XXXX-XXXX-XXXX-XXXX */\nexport function grouped(key: string): string {\n return (key.match(/.{1,4}/g) ?? [key]).join(\"-\");\n}\n","deleted",false,"label",[19],{"_33":34,"_13":19,"_35":36,"_37":-5,"_38":39,"_40":41,"_42":43,"_44":67,"_17":46,"_47":48,"_49":50,"_51":52,"_53":-5,"_64":68,"_18":69},{"_33":57,"_13":58,"_35":59,"_37":-5,"_38":39,"_40":60,"_42":43,"_44":61,"_17":41,"_47":62,"_49":63,"_51":52,"_53":-5,"_64":65,"_18":66},"8fb01f03-3d81-45e7-bfa7-ce52edee856e","main.ts","50288dfe-abac-11f1-b48d-1607ee4eb77e",3,["D",1788891002409],"http","// App-facing verifier and claim ledger for the Revolut clone.\n//\n// The app already checks a key's signature locally; this is the one thing it\n// cannot do alone — remember, across devices, that a key has been claimed. A\n// key that verifies on two phones still only activates on the first to arrive.\n//\n// POST / {\"key\":\"MHLX8644E2H7TKL9\",\"deviceId\":\"...\"}\n// 200 {\"ok\":true,\"tier\":\"M\",\"seconds\":2592000,\"expiresAt\":\"...\"}\n// 409 {\"ok\":false,\"reason\":\"claimed_elsewhere\"}\n// 403 {\"ok\":false,\"reason\":\"revoked\"}\n// 400 {\"ok\":false,\"reason\":\"bad_signature\"}\n// GET /?serial=XXXXX inspect one claim\n//\n// Plus an admin API, for the Telegram bot. Val Town gives every val its own\n// SQLite, so the bot cannot read this ledger with a query — it lives in\n// another val's database. It asks over HTTP instead, presenting ADMIN_TOKEN:\n//\n// GET /?op=list x-admin-token: … recent claims\n// GET /?op=check&serial=XXXXX x-admin-token: … one claim\n// POST /?op=revoke&serial=XXXXX x-admin-token: … kill a key\n//\n// Revoking a serial that was never claimed writes a revoked row, so the key\n// is refused the first time it is presented rather than only afterwards.\n//\n// SECRET is set in the val's env and must match Activation.swift.\n\nimport { sqlite } from \"https://esm.town/v/std/sqlite/main.ts\";\nimport { DURATION, initDb, tag } from \"./keys.ts\";\n\nfunction json(body: unknown, status = 200): Response {\n return new Response(JSON.stringify(body), {\n status,\n headers: { \"content-type\": \"application/json\" },\n });\n}\n\n/// The admin API. Returns null when this isn't an authenticated admin call,\n/// so the app-facing path below runs untouched.\nasync function admin(req: Request): Promise {\n const token = Deno.env.get(\"ADMIN_TOKEN\");\n if (!token || req.headers.get(\"x-admin-token\") !== token) return null;\n\n const url = new URL(req.url);\n const op = url.searchParams.get(\"op\");\n const serial = (url.searchParams.get(\"serial\") ?? \"\").toUpperCase()\n .replace(/[^A-Z0-9]/g, \"\").slice(0, 5);\n\n if (op === \"list\") {\n const limit = Math.min(Number(url.searchParams.get(\"limit\") ?? 10) || 10, 50);\n const r = await sqlite.execute({\n sql: `SELECT serial, tier, device_id, claimed_at, expires_at, revoked\n FROM revolut_claims ORDER BY claimed_at DESC LIMIT ?`,\n args: [limit],\n });\n return json({ ok: true, claims: r.rows });\n }\n\n if (op === \"check\") {\n if (serial.length !== 5) return json({ ok: false, reason: \"bad_serial\" }, 400);\n const r = await sqlite.execute({\n sql: `SELECT serial, tier, device_id, claimed_at, expires_at, revoked\n FROM revolut_claims WHERE serial = ?`,\n args: [serial],\n });\n return json({ ok: true, claim: r.rows[0] ?? null });\n }\n\n if (op === \"revoke\") {\n if (serial.length !== 5) return json({ ok: false, reason: \"bad_serial\" }, 400);\n const existing = await sqlite.execute({\n sql: \"SELECT serial FROM revolut_claims WHERE serial = ?\",\n args: [serial],\n });\n if (existing.rows.length) {\n await sqlite.execute({\n sql: \"UPDATE revolut_claims SET revoked = 1 WHERE serial = ?\",\n args: [serial],\n });\n return json({ ok: true, revoked: serial, claimed: true });\n }\n const now = new Date().toISOString();\n await sqlite.execute({\n sql: `INSERT INTO revolut_claims (serial, tier, device_id, claimed_at, expires_at, revoked)\n VALUES (?, ?, ?, ?, ?, 1)`,\n args: [serial, \"?\", \"revoked\", now, now],\n });\n return json({ ok: true, revoked: serial, claimed: false });\n }\n\n return json({ ok: false, reason: \"unknown_op\" }, 400);\n}\n\nexport default async function (req: Request): Promise {\n const secret = Deno.env.get(\"SECRET\");\n if (!secret) return json({ ok: false, reason: \"server_not_configured\" }, 500);\n await initDb();\n\n const administered = await admin(req);\n if (administered) return administered;\n\n if (req.method === \"GET\") {\n const serial = new URL(req.url).searchParams.get(\"serial\");\n if (!serial) {\n return json({ ok: true, service: \"revolut clone activation\", hint: \"POST {key, deviceId}\" });\n }\n const r = await sqlite.execute({\n sql: \"SELECT serial, tier, device_id, claimed_at, expires_at, revoked FROM revolut_claims WHERE serial = ?\",\n args: [serial.toUpperCase()],\n });\n return json({ ok: true, claim: r.rows[0] ?? null });\n }\n\n if (req.method !== \"POST\") return json({ ok: false, reason: \"method\" }, 405);\n\n let body: { key?: string; deviceId?: string };\n try { body = await req.json(); } catch { return json({ ok: false, reason: \"bad_json\" }, 400); }\n\n const key = (body.key ?? \"\").toUpperCase().replace(/[^A-Z0-9]/g, \"\");\n const deviceId = (body.deviceId ?? \"\").trim();\n if (key.length !== 16 || !deviceId) return json({ ok: false, reason: \"bad_request\" }, 400);\n\n const payload = key.slice(0, 6);\n const tier = key[0];\n const serial = key.slice(1, 6);\n if (!DURATION[tier]) return json({ ok: false, reason: \"unknown_tier\" }, 400);\n if (await tag(payload, secret) !== key.slice(6)) return json({ ok: false, reason: \"bad_signature\" }, 400);\n\n const existing = await sqlite.execute({\n sql: \"SELECT device_id, expires_at, revoked FROM revolut_claims WHERE serial = ?\",\n args: [serial],\n });\n\n if (existing.rows.length > 0) {\n const row = existing.rows[0] as Record;\n if (Number(row.revoked)) return json({ ok: false, reason: \"revoked\" }, 403);\n // The same device asking again is fine — a reinstall re-check returns the\n // claim it already owns rather than being told the key is taken.\n if (String(row.device_id) !== deviceId) return json({ ok: false, reason: \"claimed_elsewhere\" }, 409);\n return json({ ok: true, tier, seconds: DURATION[tier], expiresAt: String(row.expires_at) });\n }\n\n // First claim wins. 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