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We must intercept\n // it before the regex extracts it, and forward it straight to your real inbox.\n const isVerification = e.from.includes(\"forwarding-noreply@google.com\") ||\n e.subject?.includes(\"Forwarding Confirmation\");\n\n if (isVerification) {\n console.log(\n \"Intercepted Gmail Forwarding Confirmation. Forwarding to owner.\",\n );\n await email({\n subject: `[ACTION REQUIRED] Fwd: ${\n e.subject ?? \"Gmail Forwarding Confirmation\"\n }`,\n text:\n `Click the confirmation link below to activate your Gmail forwarding rule:\\n\\n${body}`,\n html: e.html,\n });\n return;\n }\n // ----------------------------\n\n const haystack = `${e.subject ?? \"\"}\\n${body}`;\n const code = extractOtp(haystack);\n\n if (!code) {\n // Not an OTP — forward the whole message to your real inbox.\n console.log(\n `No OTP in email from ${e.from} (\"${\n e.subject ?? \"\"\n }\") — forwarding to owner`,\n );\n await email({\n subject: `[OTP relay] Fwd: ${e.subject ?? \"(no subject)\"}`,\n text: `Forwarded from: ${e.from}\\n\\n${body}`,\n html: e.html,\n });\n return;\n }\n\n const token = Deno.env.get(\"OTP_API_TOKEN\");\n let codeToSave = code;\n\n if (token) {\n console.log(\"OTP_API_TOKEN found, encrypting OTP before storage...\");\n try {\n const encryptedData = await encryptOtp(code, token);\n codeToSave = JSON.stringify(encryptedData);\n } catch (err) {\n console.error(\"Encryption failed:\", err);\n // Fallback or handle error. Here we store plaintext if encryption fails,\n // but ideally we should throw. Let's throw.\n throw new Error(\"Failed to encrypt OTP\");\n }\n }\n\n await saveOtp(codeToSave, e.from, e.subject ?? null);\n console.log(`Stored OTP from ${e.from} (\"${e.subject ?? \"\"}\")`);\n}","deleted","label",[63],"f927e342-e5f6-4a5c-acd5-2a7a27ee767c","db.ts","019ea892-a3cd-76f8-9377-07431e4082d7",["D",1780944642915],"script","// Shared SQLite schema + helpers for the OTP relay.\nimport { sqlite } from \"https://esm.town/v/std/sqlite/main.ts\";\n\nexport const TTL_MS = 5 * 60 * 1000; // codes expire after 5 minutes\n\nexport interface OtpRecord {\n code: string;\n sender: string | null;\n subject: string | null;\n created_at: number;\n}\n\nexport async function initDb() {\n await sqlite.execute(`CREATE TABLE IF NOT EXISTS otp_codes (\n id INTEGER PRIMARY KEY AUTOINCREMENT,\n code TEXT NOT NULL,\n sender TEXT,\n subject TEXT,\n created_at INTEGER NOT NULL\n )`);\n}\n\n/** Delete any codes older than the TTL. Keeps the table small and enforces expiry. */\nexport async function purgeExpired() {\n await sqlite.execute({\n sql: \"DELETE FROM otp_codes WHERE created_at < ?\",\n args: [Date.now() - TTL_MS],\n });\n}\n\n/** Extract the first plausible 6-digit OTP from a block of text. */\nexport function extractOtp(text: string): string | null {\n if (!text) return null;\n // Match a standalone run of exactly 6 digits (not embedded in a longer number).\n // Allows an optional separator in the middle (e.g. \"123 456\" or \"123-456\").\n const match = text.match(/(? {\n await initDb();\n await purgeExpired();\n const cutoff = Date.now() - TTL_MS;\n const result = await sqlite.execute({\n sql:\n \"SELECT code, sender, subject, created_at FROM otp_codes WHERE created_at >= ? ORDER BY created_at DESC LIMIT 1\",\n args: [cutoff],\n });\n if (result.rows.length === 0) return null;\n const row = result.rows[0] as unknown as OtpRecord;\n const age = Date.now() - row.created_at;\n return { ...row, age_ms: age, expires_in_ms: TTL_MS - age };\n}\n",[82],"18004db9-709e-443b-8eef-928b571abf10","crypto.ts","019ea892-a3cd-76f8-9377-037cc428d76c",["D",1780944642915],"/**\n * Helper to encrypt the OTP using AES-GCM and a shared secret.\n */\nexport async function encryptOtp(text: string, token: string): Promise<{ encryptedHex: string, ivHex: string }> {\n // 1. Hash the token to create a robust 256-bit key\n const hash = await crypto.subtle.digest(\"SHA-256\", new TextEncoder().encode(token));\n const key = await crypto.subtle.importKey(\"raw\", hash, \"AES-GCM\", false, [\"encrypt\"]);\n\n // 2. Generate a random IV\n const iv = crypto.getRandomValues(new Uint8Array(12));\n\n // 3. Encrypt the text\n const encryptedBuf = await crypto.subtle.encrypt({ name: \"AES-GCM\", iv }, key, new TextEncoder().encode(text));\n\n // 4. Convert buffers to hex strings for safe storage in SQLite\n const toHex = (buf: ArrayBuffer) => Array.from(new Uint8Array(buf))\n .map(b => b.toString(16).padStart(2, '0'))\n .join('');\n\n return {\n encryptedHex: toHex(encryptedBuf),\n ivHex: toHex(iv.buffer)\n };\n}",[89],"4b62c04c-ba6f-479e-a1ac-fd533f7a5b76","api.ts","019ea892-a3cd-76f8-9376-feecc3bebe49",["D",1780944642915],"http","// HTTP val: returns the latest non-expired OTP to the browser extension.\n// Learn more: https://docs.val.town/vals/http/\nimport { getLatestOtp } from \"./db.ts\";\n\n// When ANY CORS header is set, Val Town stops adding its defaults — so we set\n// the full set ourselves here.\nconst CORS_HEADERS: Record = {\n \"Access-Control-Allow-Origin\": \"*\",\n \"Access-Control-Allow-Methods\": \"GET, OPTIONS\",\n \"Access-Control-Allow-Headers\": \"Content-Type, Authorization, X-Auth-Token\",\n \"Access-Control-Max-Age\": \"86400\",\n};\n\nfunction json(body: unknown, status = 200): Response {\n return new Response(JSON.stringify(body), {\n status,\n headers: { \"Content-Type\": \"application/json\", ...CORS_HEADERS },\n });\n}\n\nexport default async function (req: Request): Promise {\n // Preflight\n if (req.method === \"OPTIONS\") {\n return new Response(null, { status: 204, headers: CORS_HEADERS });\n }\n\n if (req.method !== \"GET\") {\n return json({ error: \"Method not allowed\" }, 405);\n }\n\n // Optional shared-secret gate. If OTP_API_TOKEN is set, callers must supply it\n // via the `X-Auth-Token` header or `?token=` query param. This keeps the\n // public endpoint from leaking codes to anyone who guesses the URL.\n const requiredToken = Deno.env.get(\"OTP_API_TOKEN\");\n if (requiredToken) {\n const url = new URL(req.url);\n const provided = req.headers.get(\"X-Auth-Token\") ??\n req.headers.get(\"Authorization\")?.replace(/^Bearer\\s+/i, \"\") ??\n url.searchParams.get(\"token\");\n if (provided !== requiredToken) {\n return json({ error: \"Unauthorized\" }, 401);\n }\n }\n\n const latest = await getLatestOtp();\n if (!latest) {\n return json({ code: null, message: \"No active OTP\" }, 404);\n }\n\n return json({\n code: latest.code,\n sender: latest.sender,\n subject: latest.subject,\n createdAt: latest.created_at,\n expiresInMs: latest.expires_in_ms,\n });\n}\n",[95],"ab4e42ab-3c38-4aca-92fd-b882adf4e1eb","README.md","019ea892-a3cd-76f8-9376-fb54999f69df",["D",1780944642915],"# OTP Email → Browser Extension Relay\n\nSecurely relays 6-digit OTP codes from forwarded emails to a browser extension.\n\n## How it works\n\n```mermaid\nflowchart LR\n A[OTP email] -->|forward to val address| B[inbox.ts
Email Val]\n B -->|extract 6-digit code| C[(SQLite
otp_codes)]\n D[Browser extension] -->|GET /| E[api.ts
HTTP Val]\n E -->|read latest non-expired| C\n E -->|JSON code + CORS| D\n```\n\n## Files\n\n| File | Type | Role |\n|------|------|------|\n| `inbox.ts` | email | Receives forwarded emails, extracts the first 6-digit code, stores it with a timestamp. |\n| `api.ts` | http | Returns the most recent **non-expired** OTP as JSON, with full CORS headers. |\n| `db.ts` | script | Shared SQLite schema + helpers (`extractOtp`, `saveOtp`, `getLatestOtp`, `purgeExpired`). |\n\n## Setup\n\n1. **Forward OTP emails** to the email val's address (find it in the Val Town UI for `inbox.ts`, or in the `links.email` field). You can set up an auto-forward rule in Gmail/Outlook so codes arrive automatically.\n\n2. **(Recommended) Protect the endpoint.** The HTTP endpoint is public, so anyone with the URL could read your codes. Set an `OTP_API_TOKEN` env var and have your extension send it. When set, callers must provide it via:\n - `X-Auth-Token: ` header, **or**\n - `Authorization: Bearer ` header, **or**\n - `?token=` query param.\n\n 👉 Add OTP_API_TOKEN here: https://www.val.town/x/indenigrate/email-val/environment-variables?key=OTP_API_TOKEN\n\n## Expiry\n\nCodes expire **5 minutes** after they arrive (`TTL_MS` in `db.ts`). Expired rows are purged lazily on every read and write, so the store never serves a stale code.\n\n## API response\n\n`GET /` returns:\n\n```json\n{\n \"code\": \"614209\",\n \"sender\": \"no-reply@bank.example\",\n \"subject\": \"Your verification code\",\n \"createdAt\": 1780528667360,\n \"expiresInMs\": 297315\n}\n```\n\n- `404 { \"code\": null }` — no active OTP.\n- `401 { \"error\": \"Unauthorized\" }` — `OTP_API_TOKEN` is set and the caller didn't supply it.\n\n## Example: fetching from an extension\n\n```js\nconst res = await fetch(\"https://YOUR-ENDPOINT.web.val.run\", {\n headers: { \"X-Auth-Token\": \"your-secret-token\" },\n});\nconst { code } = await 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