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6-digit OTPs from forwarded emails to a browser extension",{"_11":126,"_96":129},"https://lh3.googleusercontent.com/a/ACg8ocJwD0RUE37HSMwrSwLEcHlgx6sHh2qmNBrvwUFvZmymKRTjQW8=s96-c",{"_20":174,"_13":175,"_137":176,"_139":-5,"_140":21,"_141":142,"_143":52,"_22":177,"_29":56,"_145":110,"_147":178,"_149":40,"_150":-5,"_98":179},{"_20":166,"_13":167,"_137":50,"_139":-5,"_140":21,"_141":168,"_143":52,"_22":169,"_29":170,"_145":171,"_147":172,"_149":40,"_150":-5,"_98":173},{"_20":159,"_13":160,"_137":161,"_139":-5,"_140":21,"_141":30,"_143":52,"_22":162,"_29":163,"_145":156,"_147":164,"_149":40,"_150":-5,"_98":165},{"_20":152,"_13":153,"_137":154,"_139":-5,"_140":21,"_141":142,"_143":52,"_22":155,"_29":56,"_145":156,"_147":157,"_149":40,"_150":-5,"_98":158},{"_20":135,"_13":136,"_137":138,"_139":-5,"_140":21,"_141":142,"_143":52,"_22":144,"_29":56,"_145":146,"_147":148,"_149":40,"_150":-5,"_98":151},"ca0ef18e-aebc-48ba-81bc-fb64976d01c9","inbox.ts","fileId","019fc8bc-5004-74ab-871a-1805c1c2e05f","parentId","branchId","branchVersion",1,"latest",["D",1785779212186],"fileType","email","content","// Email val: receives forwarded emails, extracts a 6-digit OTP, stores it.\n// Anything that isn't an OTP (e.g. Google's forwarding confirmation link) is\n// forwarded to your real inbox so you can act on it.\n// Learn more: https://docs.val.town/vals/email/\nimport { email } from \"https://esm.town/v/std/email\";\nimport { extractOtp, saveOtp } from \"./db.ts\";\nimport { encryptOtp } from \"./crypto.ts\";\n\ninterface Email {\n from: string;\n to: string[];\n subject?: string;\n text?: string;\n html?: string;\n attachments: File[];\n headers: Record;\n}\n\n/** Strip HTML tags to plain text as a fallback when no text body is present. */\nfunction htmlToText(html: string): string {\n return html\n .replace(//gi, \" \")\n .replace(//gi, \" \")\n .replace(/<[^>]+>/g, \" \")\n .replace(/ /gi, \" \")\n .replace(/\\s+/g, \" \");\n}\n\nexport default async function (e: Email) {\n const body = e.text?.trim() || (e.html ? htmlToText(e.html) : \"\");\n\n // --- THE NEW GUARD CLAUSE ---\n // Gmail's verification email contains a confirmation code. 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",[136],"101aace2-583a-4ca5-a819-41d566761388","db.ts","019fc8bc-5004-74ab-871a-141805d6c310",["D",1785779212186],"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",[153],"c5425670-240b-4ffe-84f5-0ffc916f989d","crypto.ts","019fc8bc-5004-74ab-871a-13bee7fde829",["D",1785781149232],6,"/**\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}\n/**\n * Helper to decrypt the OTP using AES-GCM and a shared secret.\n */\nexport async function decryptOtp(encryptedHex: string, ivHex: string, token: string): Promise {\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, [\"decrypt\"]);\n\n // 2. Convert hex strings back to Uint8Arrays\n const fromHex = (hex: string) => new Uint8Array(\n hex.match(/.{1,2}/g)!.map(byte => parseInt(byte, 16))\n );\n\n const iv = fromHex(ivHex);\n const encrypted = fromHex(encryptedHex);\n\n // 3. Decrypt the text\n const decryptedBuf = await crypto.subtle.decrypt({ name: \"AES-GCM\", iv }, key, encrypted);\n\n // 4. Return the decrypted plaintext\n return new TextDecoder().decode(decryptedBuf);\n}",[160],"5f35c6e7-6ae7-40f9-8061-23fd07a57867","api.ts",4,["D",1785780366097],2,"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\";\nimport { decryptOtp } from \"./crypto.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 // If OTP_API_TOKEN is set, the code was stored encrypted — decrypt it now.\n let code = latest.code;\n const token = Deno.env.get(\"OTP_API_TOKEN\");\n if (token) {\n try {\n const encryptedData = JSON.parse(latest.code);\n code = await decryptOtp(encryptedData.encryptedHex, encryptedData.ivHex, token);\n } catch {\n // Code wasn't encrypted (stored as plaintext), return as-is\n }\n }\n\n return json({\n code,\n sender: latest.sender,\n subject: latest.subject,\n createdAt: latest.created_at,\n expiresInMs: latest.expires_in_ms,\n });\n}\n",[167],"cf48f67f-ecbf-400a-a03f-5dd2cbe6363c","README.md","019fc8bc-5004-74ab-871a-09a08f3b1967",["D",1785779212186],"# 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 res.json();\n```\n",[175],"pulls","forks","envVars",{"_186":142,"_188":56},"connections",{"_186":56,"_187":56},"count","unfilledCount","emptyCount",{"_20":174,"_13":175,"_137":176,"_139":-5,"_140":21,"_141":142,"_143":52,"_22":207,"_29":56,"_145":110,"_147":178,"_149":40,"_150":-5,"_195":208,"_98":209},{"_20":166,"_13":167,"_137":50,"_139":-5,"_140":21,"_141":168,"_143":52,"_22":204,"_29":170,"_145":171,"_147":172,"_149":40,"_150":-5,"_195":205,"_98":206},{"_20":159,"_13":160,"_137":161,"_139":-5,"_140":21,"_141":30,"_143":52,"_22":201,"_29":163,"_145":156,"_147":164,"_149":40,"_150":-5,"_195":202,"_98":203},{"_20":152,"_13":153,"_137":154,"_139":-5,"_140":21,"_141":142,"_143":52,"_22":198,"_29":56,"_145":156,"_147":157,"_149":40,"_150":-5,"_195":199,"_98":200},{"_20":135,"_13":136,"_137":138,"_139":-5,"_140":21,"_141":142,"_143":52,"_22":194,"_29":56,"_145":146,"_147":148,"_149":40,"_150":-5,"_195":196,"_98":197},["D",1785779212186],"children",[],[136],["D",1785779212186],[],[153],["D",1785781149232],[],[160],["D",1785780366097],[],[167],["D",1785779212186],[],[175],["D",1785779212186],["D",1789693835578],{"_11":12,"_96":92},{"_11":12,"_89":90,"_91":92,"_47":48,"_93":94,"_95":40},{"_29":30,"_13":26,"_20":21,"_27":28,"_31":32,"_33":34,"_82":42,"_83":84,"_85":86,"_87":14,"_88":12},"ctx",{"_75":-5,"_120":248,"_249":250,"_251":252,"_253":40,"_254":40,"_255":40,"_256":52,"_257":-5,"_258":-7,"_259":-7,"_260":56,"_261":40,"_262":40,"_263":-5,"_264":40,"_265":40,"_266":40,"_267":-5},"ENV",{"_219":220,"_221":222,"_223":26,"_224":225,"_226":227,"_228":229,"_230":231,"_232":233,"_234":235,"_236":237,"_238":239,"_240":241,"_242":243,"_244":245,"_246":247},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","71c1b20804b3232a7e513be260cfffc1932a9e97","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

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