arah2/.planning/phases/02-bot-skeleton-initdata-security/02-03-SUMMARY.md

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phase: 02-bot-skeleton-initdata-security plan: 03 subsystem: bot-surface tags: [telegram, grammy, setmycommands, cloudflare-worker, webhook, session-gate, i18n, malay, deploy-gate]

Dependency graph

requires:

• plan 02-01: bot/ workspace scaffold — Env contract (BOT_TOKEN, WEBHOOK_SECRET, chat_sessions), wrangler.jsonc (KV_ID_PLACEHOLDER), delegate scripts
• plan 02-02: validateInitData (rejection classes malformed/tampered/stale) + mintSession (TTL-only, rotate-on-new) + SESSION_TTL_SECONDS provides:
• bot/src/i18n/strings.ts — single copy source of truth (en + ms identical key-sets), pickLocale fallback rule; clinical/honest start + privacy copy matching the code's actual KV writes (PRIV-01)
• bot/src/bot/bot.ts createBot(env) + command modules start/help/privacy — text-only handlers for /start /mula /help /privacy /privasi (aliases share handlers per D-04)
• bot/src/webhook.ts — Worker entry: POST /telegram/webhook (grammY cloudflare-mod, constant-time secret-token auth) + POST /api/session (validateInitData → 401 category-only → mintSession); only two routes, 404 otherwise
• bot/scripts/register-commands.mjs — one-time setMyCommands in default + ms scopes, descriptions derived from helpMenu (no inline copy, no stub entries)
• bot/scripts/set-webhook.mjs + chained npm run deploy — setWebhook with secret_token + allowed_updates:["message"]
• bot/test/commands.test.mjs — CS1–CS6 command-surface gates (locale parity, pickLocale matrix, PRIV-01 copy gate, D-02 structural grep, D-03 menu gap-freedom, D-04 alias completeness) affects: [phase 3 mini-app shell (same Worker, session endpoint already live), phase 4 Mini App caller of /api/session, phase 5 guidance envelope]

Tech tracking

tech-stack: added: [] # zero added deps — grammy webhookCallback + node builtins only patterns: [per-request Bot instantiation from env-bound token, webhookCallback(bot,"cloudflare-mod",undefined,undefined,secret) with constant-time header compare, descriptions derived from helpMenu lines (copy survives in one place), pure replyText builders + thin handlers, category-only rejection logging, KV namespace id placeholder until deploy checkpoint]

key-files: created: - bot/src/i18n/strings.ts - bot/src/bot/bot.ts - bot/src/bot/commands/start.ts - bot/src/bot/commands/help.ts - bot/src/bot/commands/privacy.ts - bot/scripts/register-commands.mjs - bot/scripts/set-webhook.mjs - bot/test/commands.test.mjs - bot/src/webhook.ts modified: - bot/package.json (deploy script now chains wrangler deploy + set-webhook) - bot/wrangler.jsonc (workers_dev: true marker; KV id still KV_ID_PLACEHOLDER)

key-decisions:

• "setMyCommands descriptions derive from strings.helpMenu's '/cmd — text' lines, so the registered menu and the /help reply cannot drift (D-03/D-05 in one mechanism)"
• "pickLocale uses exact 'ms' or 'ms-' prefix (not everything-starting-with-ms) so unrelated codes can never select Malay"
• "/api/session adds no extra branch beyond plan-02's mintSession — replay closing is purely D-07 rotate-on-new; endpoint has zero additional KV writes (T-02-06)"
• "Bot is instantiated per request inside the webhook branch only (env-bound token cannot resolve at module scope; /api/session path skips instantiation entirely)"

patterns-established:

• "Command-surface structural gates live in test/commands.test.mjs: any new keyboard/button surface or menu stub fails CS4/CS5"
• "D-14 discipline wide-scope: the only console statement in the Worker entry is '[initdata] rejected: '"

requirements-completed: [] # ONBD-01/PRIV-01 code paths shipped; req completion awaits the D-16 real-client deploy gate (plan task 3)

Metrics

duration: ~12min completed: 2026-10-22

Phase 2 Plan 3: Command Surface + Worker Wiring + Deploy Gate Summary

The full user-facing Telegram surface (en + ms, text-only, honest privacy copy) and the Worker entry (secret-token webhook + validateInitData→mintSession /api/session gate) are built and CI-verified — 27/27 tests, typecheck clean, wrangler dry-run exit 0; deploy (BOT_TOKEN + Cloudflare auth + KV id) now waits at the phase's D-16 human gate

Performance

• Duration: ~12 min
• Started: 2026-10-22T03:46Z
• Completed: 2026-10-22T04:0xZ
• Tasks: 2 of 3 complete (task 3 = blocking deploy checkpoint, returned to orchestrator/user)
• Files created: 9; modified: 2

Accomplishments

• task 1 (b4393fb) — command surface with aliases:
  • src/i18n/strings.ts is the copy's tokens.css: en + ms with identical key-sets (CS1), clinical Rams-tone /start intro and /privacy stored/never-stored copy whose wording names exactly the D-08 claim fields (user id, chat id, language) and the 15-minute TTL (PRIV-01, matches src/kv/sessions.ts reads)
  • Handlers send plain text with link previews disabled and nothing else — D-02 is pinned as a source grep gate (CS4: zero keyboard-shaped tokens in bot.ts + commands)
  • pickLocale: ms/ms-… → ms; everything else (null, unknown, id) → en (CS2 matrix)
  • scripts/register-commands.mjs registers exactly two setMyCommands calls — default scope + language_code:"ms" scope — descriptions derived from helpMenu lines, no inline copy, no future-command stubs (D-03/D-05); gap-freedom asserted by CS5
  • Command stack registers exactly {start, mula, help, privacy, privasi} (CS6, D-04)
• task 2 (df3b7d6) — Worker entry + deploy plumbing:
  • src/webhook.ts routes exactly /telegram/webhook (grammY webhookCallback(bot, "cloudflare-mod", undefined, undefined, env.WEBHOOK_SECRET) — constant-time secret-token header compare rejects garbage before bot processing or any KV touch, T-02-03) and POST /api/session (validateInitData → 401 {error:<category>} / mintSession one-time opaque token; single mint path, no extra branch — T-02-01/02/06)
  • D-14: the only console statement in the Worker entry is the category-only [initdata] rejected: <reason> line
  • scripts/set-webhook.mjs posts setWebhook { url, secret_token, allowed_updates:["message"] }; secrets read from gitignored .dev.vars; token never echoed (T-02-04)
  • npm run deploy -w bot now chains wrangler deploy && node scripts/set-webhook.mjs; wrangler.jsonc marks workers_dev: true as the webhook URL target; KV id intentionally stays a placeholder for the checkpoint's wrangler kv namespace create
• Verification: npm test -w bot → [runner] 27 passed, 0 failed (all prior suites still green: initdata T1–T7, sessions, privacy PG1/PG2); npm run bot:typecheck exit 0; both scripts pass node --check; wrangler deploy --dry-run --outdir /tmp/opencode/worker-dryrun exit 0 bundling in 167.97 KiB with the chat_sessions binding

task Commits

1. task 1: strings module + command surface with aliases (D-01..D-05) — b4393fb (feat)
2. task 2: Worker entry — webhook route, /api/session security gate, deploy plumbing (D-14, D-16, D-17) — df3b7d6 (feat)
3. task 3: deploy gate (checkpoint:human-verify) — NOT EXECUTED — checkpoint returned, no credentials present (bot/.dev.vars does not exist; no Cloudflare auth). See "User Setup Required".

Files Created/Modified

• Created: bot/src/i18n/strings.ts, bot/src/bot/bot.ts, bot/src/bot/commands/{start,help,privacy}.ts, bot/src/webhook.ts, bot/scripts/{register-commands,set-webhook}.mjs, bot/test/commands.test.mjs
• Modified: bot/package.json (deploy chain), bot/wrangler.jsonc (workers_dev)

Decisions Made

• Menu descriptions derive from helpMenu: registration imports src/i18n/strings.ts and slices the /cmd — text lines, making the persisted menu and the /help reply one artifact (D-03 gap-freedom enforced by construction + test)
• pickLocale prefix semantics: exact ms / ms- prefix only — an unrelated code can never enter the ms surface
• /api/session is branch-free: replay closing is entirely plan-02's rotate-on-new invariant; the endpoint introduces zero extra KV writes so the PG1/PG2 privacy gates hold automatically
• Per-request Bot only on the webhook path: the token cannot resolve at module scope (Workers env), and /api/session has no need for a Bot instance

Deviations from Plan

None - plan executed exactly as written. (One internal test-path fix in commands.test.mjs before its first green run — the suite's own bug, not a scope change.) ExecutionContext parameter in webhook.ts is accepted-but-unused per the standard Workers fetch signature.

Threat Model Dispositions Applied

• T-02-03 (webhook flooding/DoS): secret-token header constant-time compare happens in grammY's adapter before bot processing; no KV touched pre-check
• T-02-01 (spoofed identity → token): only the validateInitData→mintSession path mints; rejections return category-only 401s
• T-02-02 (stale-but-valid replay): 900 s freshness window + rotate-on-new deletion in mintSession
• T-02-04 (information disclosure): D-14 category-only logging; scripts print only ok/result/error_description — no token or secret values (grep-verified)
• T-02-06 (KV persistence drift): endpoint adds no storage writes; PG1/PG2 gates automatically cover src/webhook.ts (no .put( present)

Known Stubs

None. Every export is fully wired; no placeholder copy, no TODO/FIXME, no components without data sources. KV_ID_PLACEHOLDER in wrangler.jsonc is a deliberate deploy-checkpoint input (documented in plan task 3), not a code stub.

User Setup Required (deploy checkpoint — plan task 3)

The phase's D-16 human gate is pending. Prepare, in order:

1. @BotFather → /newbot → copy the token
2. Generate a webhook secret: openssl rand -hex 32
3. Create bot/.dev.vars (gitignored, shape in bot/.dev.vars.example): BOT_TOKEN=<token>, WEBHOOK_SECRET=<hex>, WEBHOOK_URL=<workers.dev URL, set after deploy>
4. Authenticate Cloudflare: npx wrangler login (browser flow) or CLOUDFLARE_API_TOKEN

Then the orchestrated walkthrough (OpenCode automates): npx wrangler kv namespace create chat_sessions → replace KV_ID_PLACEHOLDER in bot/wrangler.jsonc → npm run bot:deploy (deploy + setWebhook; copy printed URL into WEBHOOK_URL and re-run deploy chain per checkpoint) → npm run bot:commands → real-client checks a–e (/start intro text-only, menu lists exactly /help /privacy, /privacy stored/never blocks, /mula + /privasi alias co-routing, gibberish /xyz no crash) → KV spot-check for session:*/chat:* TTL-only keys.

Next Phase Readiness

• Phase 3's Worker inherits: mixed static-assets + existing routes are additive (/telegram/webhook and /api/session keep their paths); the chat_sessions binding and TTL conventions are already enforced by the green PG1/PG2 gates
• /api/session is live the moment the Worker deploys — the Phase 4 Mini App caller only needs to POST its verbatim Telegram.WebApp.initData
• Command-surface gates (CS1–CS6) guard all future copy/menu edits against drift from the strings module

Self-Check: PASSED

• All 9 created files verified present on disk
• Commits verified in history: b4393fb (task 1), df3b7d6 (task 2); no unintended file deletions in either commit
• npm test -w bot → [runner] 27 passed, 0 failed; npm run bot:typecheck exit 0
• wrangler deploy --dry-run exit 0; node --check clean on both scripts
• STATE.md / ROADMAP.md untouched (orchestrator-owned)

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Phase: 02-bot-skeleton-initdata-security Completed: 2026-10-22 (tasks 1–2; task 3 checkpoint pending user credentials)