Commit Graph

14 Commits

Author SHA1 Message Date
Grant 5d7f68fef8 Recurring subs Phase 6 — cancellation flow (admin + buyer self-serve)
Closes the recurring-subs feature loop: operators can cancel subs from
the admin UI, buyers can self-cancel by submitting their signed
license key. Cancellation is non-destructive — the license stays
valid through end-of-cycle, the renewal worker just stops creating
new invoices because its WHERE filter excludes status='cancelled'.

New API
- GET  /v1/admin/subscriptions             — list (filter: status=...)
- POST /v1/admin/subscriptions/:id/cancel  — operator cancel (audited)
- POST /v1/subscriptions/cancel            — buyer self-service; auth
                                             via license_key in body,
                                             verified by signature

Repo helpers (src/subscriptions.rs)
- get_subscription_by_id
- get_subscription_by_license_id  (1:1 unique on license_id, used by
                                   buyer self-service)
- list_subscriptions(status_filter, limit)
- cancel_subscription              (idempotent UPDATE, returns whether
                                    it actually transitioned)

Behavior details
- Both endpoints fire `subscription.cancelled` webhook with
  actor=admin/buyer so operators can distinguish self-service.
- Audit log differentiates by actor_kind: 'admin_api_key' vs
  'buyer_license_key'.
- Buyer endpoint returns 401 (not 404) on bad/wrong key so a probe
  can't enumerate which licenses have active subs.
- Buyer endpoint returns 401 on revoked or suspended licenses too —
  same reason.
- Admin endpoint returns 200 with `{already: <prior_state>}` on
  re-cancel (idempotency); 404 on unknown sub.

Tests (+4, total now 57)
- admin_cancel_subscription_happy_path: full flow + DB invariants +
  audit row + idempotency
- admin_cancel_unknown_subscription_404s
- buyer_cancel_subscription_via_license_key: full flow + actor_kind
- buyer_cancel_rejects_garbage_key: 401 not 404

Admin UI for the cancel button + subscriptions tab lands in a
follow-up commit (kept this one to the API surface so it's reviewable
in isolation).
2026-05-08 17:53:42 -05:00
Grant c301eacfaa Recurring subs Phase 4 — admin UI + buy-page rendering + Pro-tier gate
Phase 4 surfaces the recurring-subscription schema (migration 0011) and
renewal-worker (Phase 2, commit 7007bf8) through every layer operators
and buyers actually see:

API
- Policy struct + repo gain is_recurring, renewal_period_days,
  grace_period_days, trial_days. RecurringConfig / RecurringUpdate
  helper structs keep create_policy / update_policy signatures
  manageable.
- CreatePolicyReq + UpdatePolicyReq accept all four fields. Validation
  rejects internally inconsistent combos (recurring=true with period=0,
  trial > renewal period, period >5y, grace >90d).
- New tier::enforce_recurring_feature gate. Pro/Patron only — Creator
  and Unlicensed get a 402 with upgrade_url. The gate fires on both
  create-policy and the false→true transition in update-policy.
- list_public_policies now surfaces is_recurring, renewal_period_days,
  trial_days so SDKs and the buy page can render cadence.

Admin UI (web/index.html)
- Create-policy form gets a "Recurring subscription (Pro)" section:
  is_recurring checkbox + cadence preset (monthly/quarterly/etc/custom)
  + grace period + trial days. Live enable/disable: the inputs gray
  out unless the box is ticked, and the custom-days input grays out
  unless "Custom" is selected.
- Edit-policy modal mirrors the same section, pre-populated from the
  policy's current values.
- Policies-list table shows a gold "every Nd" badge alongside the
  trial badge so operators can see at a glance which policies renew.

Buy page (/buy/<slug>)
- Tier cards on a recurring policy render a "Renews monthly/annually/
  every N days" meta line + a "/mo" / "/yr" / "/Nd" suffix on the
  price unit, so the headline reads "$25 / mo" not just "$25".
- First-cycle trial banner shows when trial_days > 0.
- TIERS JSON map exposes is_recurring + renewal_period_days +
  trial_days so the JS price-update path keeps the cadence suffix
  in sync when the buyer clicks between tiers.

Tests (+4, total now 53)
- recurring_policy_blocked_on_creator_tier — 402 + upgrade_url
- pro_tier_creates_monthly_recurring_policy — full create + verify
  via both admin GET and public list endpoint
- recurring_requires_positive_period — validator rejects period=0
- edit_policy_to_recurring_respects_tier_gate — Creator 402 on flip,
  Pro 200 on same flip, name-only PATCH on already-recurring policy
  doesn't re-fire the gate after downgrade

Drive-by: wrap the state-machine ASCII diagram in subscriptions.rs in
a ```text fence so cargo's doc-test runner stops trying to compile box
characters as Rust tokens.
2026-05-08 17:47:55 -05:00
Grant ec2b21d8f7 v0.2.0:3 — durable payment-provider switching (Option B)
Closes the gap from :2 where Connect Zaprite swapped the
in-memory provider but BTCPay would silently re-take active on
the next daemon restart (because the boot-time loader picked
BTCPay first whenever btcpay_config was present, regardless of
operator intent).

What changed:

**New settings key `active_payment_provider`** in the existing
settings table. Records the operator's last explicit choice
('btcpay' | 'zaprite' | NULL = no preference). Both
btcpay_config and zaprite_config can coexist; the flag is what
determines which one the daemon loads.

**Boot-time loader respects the preference.** main.rs now reads
the flag at startup. If set to 'zaprite', Zaprite wins; if set to
'btcpay', BTCPay wins; if unset (legacy installs), falls back to
the previous BTCPay-first ordering. Cross-load fallbacks log a
WARN and try the other provider — operators with a stale flag
pointing at a wiped config don't boot unconfigured.

**Connect endpoints write the preference.**
- finish_connect (BTCPay) now sets the flag to 'btcpay' on
  successful authorize-callback completion.
- ZapriteAuthorize::connect now sets the flag to 'zaprite' on
  successful API-key validation.
- Both Disconnect endpoints clear the flag IF it pointed at the
  provider being disconnected — but leave it alone if it pointed
  at the OTHER provider (different operator intent).

**New endpoints for fast switching without re-Connect:**
- GET /v1/admin/payment-provider/status — both configs' state +
  current preference + runtime active provider, in one call.
- POST /v1/admin/payment-provider/activate { provider: "btcpay" |
  "zaprite" } — flips the active provider and the flag together,
  without going through the full Connect flow. 400 if the named
  provider isn't configured (operator must run Connect first).

**New StartOS Actions** under existing groups:
- "Activate BTCPay" (in BTCPay group)
- "Activate Zaprite" (in Zaprite group)
Both call the new activate endpoint. Operators with both
providers configured can flip back and forth in one click.

**Test:** payment_provider_preference_round_trip pre-seeds both
configs, walks through Activate-Zaprite → Activate-BTCPay →
attempt-Activate-on-wiped-config → bad-provider-name → manual
write/read of the preference key. Pins the contract.

Test count: 42 (was 41; +1).

Migration not needed — settings table from 0005 already has the
key/value/updated_at shape we need.
2026-05-08 16:51:15 -05:00
Grant 9eba309a8f v0.2.0:2 — Zaprite payment provider + recurring subscriptions schema foundation
This release adds Zaprite as an alternative to BTCPay. Operators
can now choose between two payment rails:
- BTCPay: Bitcoin-only, you run the BTCPay Server yourself
- Zaprite: Bitcoin + fiat cards (USD/EUR via Stripe/Square), brokered
  by Zaprite, settles to your connected wallets

Only one is active at a time per Keysat instance. Switching requires
Disconnect → Connect; existing license keys are unaffected. Future
v0.3 work routes per-policy choice (e.g., "free tier via Zaprite,
paid tier via BTCPay") if operators want both, but for v0.2.0:2 it's
either-or.

What's in this release:

**Migration 0011 — recurring subscriptions schema (dormant).**
Adds `subscriptions` and `subscription_invoices` tables, plus
`is_recurring`/`renewal_period_days`/`grace_period_days` (default 7)/
`trial_days` (default 0) on policies. No daemon code uses these
yet — phases 2-6 of RECURRING_SUBSCRIPTIONS_DESIGN.md land in
follow-up commits. Migration regression test covers the additive
contract against populated data.

**Migration 0012 — zaprite_config.** Singleton-row table for the
operator's Zaprite API key + base URL + recorded webhook id.
Mirrors btcpay_config from migration 0002.

**ZapriteProvider implementation.** New module at
src/payment/zaprite/ with client.rs (HTTP, Bearer auth), config.rs
(DB persistence), provider.rs (PaymentProvider trait impl). Maps
Zaprite's currency enum (BTC/USD/EUR) to/from the Money type;
maps Zaprite's order status enum (PENDING/PROCESSING/PAID/COMPLETE/
OVERPAID/UNDERPAID) to ProviderInvoiceStatus.

**Webhook security via externalUniqId round-trip.** Zaprite does
NOT publish a webhook signature scheme (verified May 2026 against
public OpenAPI + dashboard). Their docs explicitly designate
receiver-side idempotency as the security model. Keysat's defense:
attach our local invoice UUID as externalUniqId at order creation,
then trust the webhook only insofar as the order id resolves to
a local invoice in an expected state. Documented in detail in the
payment::zaprite module-level comment + the validate_webhook
docstring.

**Admin endpoints.**
- POST /v1/admin/zaprite/connect: validates the API key by pinging
  GET /v1/orders before persisting; swaps active provider atomically
- POST /v1/admin/zaprite/disconnect: clears stored creds + provider
- GET  /v1/admin/zaprite/status: read-only connection snapshot
- POST /v1/zaprite/webhook: webhook landing route (alias of the
  existing /v1/btcpay/webhook handler since validate_webhook is
  trait-level)

**StartOS Actions** under a new "Zaprite" group: Connect Zaprite,
Check Zaprite connection, Disconnect Zaprite. Operator pastes the
API key into a masked input; daemon validates + saves.

**Tests.** Two new in tests/api.rs (zaprite_webhook_event_parsing
covers the full event-type mapping + missing-id rejection +
malformed-JSON rejection; zaprite_provider_kind pins the
identification). Migration regression test for 0011. Test count
grows 39 → 41.

Operators on BTCPay see no change. Operators wanting Zaprite go
through the StartOS Actions tab → Connect Zaprite, paste their
API key, register a webhook in Zaprite's dashboard pointing at
their public Keysat URL + /v1/zaprite/webhook.

Recurring subscriptions are NOT yet operator-visible — schema only
in this release. Daemon-code that uses the subscriptions tables
(renewal worker, validate-hot-path subscription branch, admin UI)
lands in subsequent commits per the design doc's phased plan.
2026-05-08 16:34:58 -05:00
Grant d8aa9c22b9 Multi-currency Phases 3, 5, 6 — buy page, invoice rate recording, discount currency
Phase 5 (invoice records the rate):
- repo::create_invoice_with_currency takes the listed currency,
  listed value, exchange_rate_centibps, and exchange_rate_source as
  optional params; create_invoice (the legacy form) becomes a thin
  wrapper that passes None for all four. SAT-priced flows are
  unchanged.
- purchase::start now branches on product.price_currency: SAT keeps
  the existing path; USD/EUR calls rates::convert_to_sats and pins
  the listed price + rate to the local invoice row for audit. The
  buyer is still billed in BTC (BTCPay invoice is sat-denominated)
  but the audit trail records what they SAW vs what they were
  charged.
- Test paid_purchase_in_usd_records_listed_currency_and_rate seeds
  a manual rate pin ($50k/BTC), creates a USD-priced product
  ($49.00), runs through purchase, asserts the invoice row carries
  listed_currency='USD', listed_value=4900, rate_centibps=
  500_000_000, source='manual_pin', amount_sats=98_000.

Phase 3 (buy page renders fiat):
- Server-rendered initial price respects product.price_currency:
  USD products show "49.00 USD" (cents converted to display dollars)
  instead of sats. Tier-picker JS still formats per-tier prices in
  sats — that's a v0.3 polish when we plumb the rate into the JS
  render path. Most operators ship single-policy products at first,
  so the static initial render is the high-leverage piece.

Phase 6 (currency-aware discount codes):
- POST /v1/admin/discount-codes accepts optional `discount_currency`
  field ('SAT' default, 'USD', 'EUR'). Whitelisted in the handler.
- repo::create_discount_code is now a thin wrapper around
  create_discount_code_with_currency; the new helper persists
  discount_currency to the column added in 0010. Existing SAT-only
  codes keep working unchanged.

Test count: 37 (was 36; +1 paid_purchase_in_usd test).

Multi-currency design phases 1-6 all shipped (1: schema in :48; 2:
admin UI write in :48-:49; 3: buy page; 4: rate fetcher; 5: invoice
audit; 6: discount currency). Phase 7 (recurring subscriptions
re-quote) is v0.3 territory — needs the recurring-billing scaffolding
from Zaprite first.
2026-05-08 12:21:26 -05:00
Grant eb885502ba Multi-currency Phase 4 — rate fetcher with Kraken/Coinbase/CoinGecko fallback
src/rates.rs adds an in-memory rate cache (60s TTL) with a 3-source
fallback chain. AppState gains `rates: Arc<RateCache>`. Manual pins
via the settings table override the chain — used by tests for
deterministic conversions and by operators during maintenance
windows.

Admin endpoints:
- GET /v1/admin/rates: cache snapshot
- POST /v1/admin/rates/refresh: force re-fetch (audit-logged)

Two new tests (network-free, manual-pin path):
- rate_cache_honors_manual_pin_from_settings
- admin_rates_endpoint_reflects_manual_pin

Test count: 36 (was 34).
2026-05-08 12:16:22 -05:00
Grant 356d17fdde Multi-currency Phase 2 — admin write path (currency picker)
Backend:
- POST /v1/admin/products accepts both forms:
  - legacy: { price_sats: 50000 }
  - typed:  { price_currency: 'USD', price_value: 4900 }
  Whitelist enforced (SAT|USD|EUR). Mismatched legacy + typed → 400
  to catch half-migrated clients sending stale price_sats alongside
  fresh price_value.
- repo::create_product_with_currency: SAT → dual-write price_sats =
  price_value; USD/EUR → price_sats = 0 until first invoice creation
  triggers a rate lookup (Phase 4 + 5).
- Test admin_create_product_accepts_legacy_and_typed_currency_forms
  pins 6 happy/sad paths.

Frontend (Products page):
- Create-product form has a currency picker (sats / USD / EUR).
  Picker swaps the unit hint + step in place.
- Decimal entry on USD/EUR is converted to cents on the way out.
- Products table renders prices via formatProductPrice(): USD
  products show "$49.00" with optional "≈ 75k sats" hint.

Test count: 34 (was 33).
2026-05-08 12:11:36 -05:00
Grant d827b1aaab Opt-in community analytics + admin UI surface
Closes the last T2 plan item. Off by default; toggling on requires
the operator to confirm a collector URL (an empty URL is "armed but
silent"). The toggle lives on the admin Overview page next to the
public-key card — the right place for a privacy-affecting choice
since it's where operators actually live.

What's sent (per the in-card "Show me exactly what gets sent"
disclosure, and pinned by the test):
- install_uuid: random UUIDv4 generated on first opt-in. NOT
  derived from operator_name, store id, public URL, or any
  other identifier. Wipeable via the Reset button.
- daemon_version (CARGO_PKG_VERSION).
- tier (creator/pro/patron/unlicensed) — the same string the
  admin tier endpoint already exposes.
- counts: products, active_licenses, settled_invoices — each
  floored to the nearest 5 (anti-fingerprinting; an exact license
  count uniquely identifies an operator over time).
- uptime_bucket: <1d / 1-7d / 1-4w / >4w (bucketed, not exact).

What's NOT sent (test asserts none of these strings appear in the
preview heartbeat): operator_name, public_url, store_id, api_key,
buyer_email, btcpay_url. Also no product/policy slugs or names, no
license/invoice ids, no fingerprints, no webhook secrets.

Backend:
- src/analytics.rs — heartbeat builder, opt-in check, daily
  background tick (5min initial grace period after boot).
- src/api/community.rs — GET / POST / reset admin endpoints.
- main.rs spawns the background tick unconditionally; the tick
  is a no-op if disabled OR no collector URL configured.

Frontend (web/index.html, Overview page):
- Toggle + collector URL input + privacy disclosure showing the
  EXACT JSON shape that would be sent (renders the live preview
  heartbeat from /v1/admin/community-analytics).
- "Reset install_uuid" button so an operator who's been beaconing
  under one identifier can start fresh.

Also includes the configureBtcpay.ts idempotency change from
v0.1.0:46 (already committed; touched again here only because the
diff includes the .ts file in the same dirty-tree push).

Test count: 32 (was 31; +1 community_analytics_opt_in_and_privacy_contract
which seeds 23 licenses and verifies the heartbeat reports 20 —
proves the floor-to-5 anti-fingerprinting is in effect).
2026-05-08 11:35:50 -05:00
Grant f6ba1c160e Buyer self-service recovery + db-info admin endpoint
Two operator-facing additions, both addressing risks we'd flagged
earlier in the v0.2 plan but hadn't shipped.

**POST /v1/recover (+ GET /recover HTML form).** Lets a buyer who
lost their license key re-derive it themselves by presenting their
invoice id + the email they paid with. Until now, the recovery
flow was "DM the operator with your invoice id and they re-send" —
operator-time scaling badly. With this, the buyer self-serves and
the operator never has to know.

The endpoint takes (invoice_id, email), case-insensitive on email.
Returns a generic 404 on any mismatch — does NOT distinguish
"invoice not found" from "wrong email" so an attacker can't
brute-force email addresses against a known invoice id. Per-IP
rate limited at 10 requests / minute. Audit-logged as
license.recovered with the email's SHA-256 hash so PII isn't
written to the log.

The HTML form at GET /recover is server-rendered, no JS framework,
no cookies — designed for a customer who's just had a catastrophic
failure of their primary computer and reached us from whatever
device they could find.

Test in tests/api.rs:recover_returns_license_key_for_matching_pair
exercises the happy path (case-insensitive email match), the
generic-404 paths (wrong email, missing invoice), the round-trip
(recovered key validates via /v1/validate), and the audit-log
write.

**GET /v1/admin/db-info.** Cheap insurance against the
catastrophic-loss risk: /data/keysat.db is a single SQLite file,
losing it invalidates every license ever issued. StartOS's backup
machinery handles snapshotting; this endpoint gives operators a
sanity-check surface they didn't have before:
  - DB file path + on-disk size
  - last-write timestamp (max across audit_log, invoices, licenses)
  - row counts for products, policies, licenses (total + active),
    invoices (total + settled), machines (active), discount codes,
    audit log entries

Doesn't report when StartOS last backed it up — the daemon has no
visibility into the host's snapshot subsystem. What it gives the
operator is a "I expected ~50 licenses and I see ~50 licenses; the
file is N MB; the last write was 6 hours ago" check.

Test count: 31 (was 30; +1 for the recover test).
2026-05-08 11:05:10 -05:00
Grant f9ef1a854c Webhook DLQ — list failed deliveries and manually retry
Closes the silent-loss hole in outbound webhook delivery. The worker
in src/webhooks.rs retries failed deliveries with exponential backoff
up to 10 attempts, then sets next_attempt_at = NULL and walks away.
Pre-this-commit, those "dead-lettered" rows sat in webhook_deliveries
forever with no surface for the operator to discover, inspect, or
recover from them — a subscriber that was down for >6h during a
license-issuance burst would silently lose those events forever.

What's new:

- repo::DeliveryStatusFilter — enum with parse() so query strings
  map cleanly to SQL predicates.
- repo::list_deliveries — endpoint_id + status + limit, newest first.
- repo::requeue_delivery — resets attempt_count=0, clears delivered_at
  and last_error, sets next_attempt_at=now. The worker picks it up on
  the next 5s tick.

- src/api/webhook_deliveries.rs — admin module with two handlers:
  - GET /v1/admin/webhook-deliveries?endpoint_id=…&status=…&limit=…
  - POST /v1/admin/webhook-deliveries/:id/retry  (audit-logged as
    webhook_delivery.retry; 404 on missing id)
- Routes registered in src/api/mod.rs alongside the existing
  webhook_endpoints CRUD.

- tests/api.rs gains webhook_dlq_lists_failed_and_retry_requeues:
  seeds three deliveries directly via SQL (one each: delivered,
  pending, dead-lettered), exercises the list filter, runs the retry,
  asserts the row migrates from failed→pending, audit row is written,
  404 on bad id, 400 on bad status filter.

Worker code is unchanged. The DLQ is operator-actionable infrastructure
on top of the existing retry semantics.

Test count: 23 (9 unit + 4 migration + 10 API), up from 22.
2026-05-08 09:38:58 -05:00
Grant e2b296ce29 Migrate purchase::start onto PaymentProvider trait + paid-purchase test
Drops the legacy compat path. `purchase::start` now calls
`state.payment_provider().await?.create_invoice(CreateInvoiceParams {
...})` instead of `state.btcpay_client().await?.create_invoice(...)`.
Provider-specific concerns (BTCPay's checkout-URL rewriting from the
internal Docker hostname to the public domain, metadata enrichment
with `orderId` / `source`) move inside the BtcpayProvider impl where
they belong; the same code path now serves any future provider
(Zaprite, etc.) without fork/copy.

URL rewriting is removed from the caller (no longer needs to know
which provider's URLs to rewrite or how). The
`crate::payment::btcpay::rewrite_to_public` function stays on the
provider impl; pubpath unchanged.

Adds `paid_purchase_creates_invoice_via_provider` integration test —
previously deferred per :42's release notes because the compat path
prevented MockPaymentProvider from substituting. Now the mock works
through the same call site as production. Verifies:
  - daemon delegates invoice creation to the provider
  - returned provider_invoice_id is stamped on the local invoice row
  - checkout_url is what the provider returned
  - no license issued at this stage (that's the webhook's job)

Test count: 22 (9 unit + 4 migration + 9 API).
2026-05-08 09:35:41 -05:00
Grant 34704bfa03 Add tier-cap enforcement test
Verifies the 402 PAYMENT_REQUIRED gate on /v1/admin/products fires at
the Creator-tier product cap (5), and that swapping `self_tier` to a
Licensed tier with `unlimited_products` lifts the cap without a
daemon restart. Mirrors what the admin UI's "Activate Keysat license"
flow does at runtime.

Validates two production-correctness invariants:
  - the 402 carries an `upgrade_url` so the SPA can render the
    upgrade CTA inline (rather than a generic error)
  - the failed attempt does NOT leak a row into the products table —
    the cap fires BEFORE the insert
2026-05-08 09:32:53 -05:00
Grant c11764898b v0.1.0:42 — webhook idempotency test + free-purchase test
Two new API integration tests, both targeting production-correctness
invariants worth locking down:

- free_purchase_issues_license_inline: exercises the price=0 shortcut
  (price_sats_override=0 on a "free" tier policy). Verifies the daemon
  synthesizes a settled invoice locally, issues a license inline, and
  the inlined license_key validates round-trip via /v1/validate.

- webhook_settles_invoice_and_issues_license_idempotently: the most
  important new test in this set. A pending invoice + an InvoiceSettled
  webhook → license issued, status flipped. Re-delivering the SAME
  webhook (which providers DO retry, sometimes aggressively) must NOT
  duplicate the license. A duplicated license here means duplicated
  revenue and duplicated revocation surface area — both bad. This test
  pins the invariant.

MockPaymentProvider added to tests/api.rs: a test-only PaymentProvider
impl that bypasses HMAC verification and parses test-supplied JSON
bodies into ProviderWebhookEvent variants. Lets us drive deterministic
settle/expire/invalid events without a real BTCPay roundtrip. Never
compiled into the production binary.

Paid-purchase test deferred: purchase::start still uses the legacy
state.btcpay_client() compat accessor that downcasts to the concrete
BtcpayProvider, which the mock can't satisfy. Documented inline. Slots
in trivially after the trait migration on the v0.3 backlog.

Version bump to v0.1.0:42 with release notes covering everything since
:41 was published: lib.rs library refactor, the original 5 API tests
from 81066df, the 2 new ones above, KEYSAT_INTEGRATION.md restoration.
No daemon-behaviour changes for operators; straight drop-in upgrade
from :41.

Test count: 20 (9 unit + 4 migration + 7 API), up from 13 in :41.
2026-05-08 09:24:57 -05:00
Grant 81066dfe62 Add API endpoint integration tests + library scaffolding
Closes the next-biggest test gap after migration tests. The daemon has
54+ HTTP endpoints, all previously untested at the request/response
level — same shape of blind spot that allowed the v0.1.0:39 migration
bug to ship.

What's new:

- src/lib.rs — exposes the daemon's modules as a library so integration
  tests can import them (`pub mod api;`, etc.). Module source files are
  unchanged; main.rs now imports via `use keysat::...` instead of
  declaring `mod api;` directly. No runtime behaviour change in the
  binary.

- tests/api.rs — 5 integration tests that drive real HTTP requests
  through axum::Router::oneshot against a real SQLite tempfile pool
  (same options as src/db/mod.rs::init):
    1. health_endpoint_returns_200 — framework smoke test
    2. admin_endpoint_rejects_missing_or_wrong_auth — 401 vs 403 paths
    3. admin_creates_product_with_correct_token — full happy path
       (auth → handler → DB insert → audit log → response)
    4. validate_rejects_unsigned_garbage — early parse-fail surfaces
       as `ok: false, reason: "bad_format"` (HTTP still 200)
    5. validate_accepts_well_formed_license — issues a license via
       repo, signs a matching LicensePayload with the daemon's
       actual key, encodes to wire format, validates via the
       endpoint, asserts ok=true plus populated metadata fields

Test count: 9 unit + 4 migrations + 5 API = 18 (was 13).

Cargo.toml dev-deps gain `tower = { version = "0.4", features = ["util"] }`
for ServiceExt::oneshot. The main `tower` dep is feature-minimal because
axum only needs a subset.

Out of scope (explicit follow-ups):

- Purchase happy path (needs a MockPaymentProvider implementing the
  trait; ~250 LOC of mock + ~200 LOC of test).
- Webhook handler with idempotency assertions (same MockPaymentProvider
  dependency).
- Tier-cap enforcement (mechanically simple; small follow-up PR).
- Discount-code atomic reserve race (better as a SQL-layer unit test
  than an HTTP integration test).
- Rate-limiting (interacts with shared state; needs careful isolation).
- Cookie/session auth (already covered in session_layer.rs).
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