feat(connect): Peppol through the connector (hosted proxy, instance transport, ownership ledger) (#2177)

* feat(connect): peppol connector foundation: capability, ledger/budget service, quota

Adds the storage + package shape for brokering Peppol through the connector with
the same one-address + rate-budget model as bank/skatteverket: a peppol
capability (connector-gated, free on hosted), peppol as a ledger + upstream
service, a conservative rate budget, and a migration extending the ledger
service CHECK and the per-key limits (peppol_connections_per_company). Proxy
route + instance-side Qvalia reroute follow. Switch-on gated on the Qvalia
brokering-terms check.

(cherry picked from commit 3cc0da6a3, migration renumbered 20260902190000)

Signed-off-by: Jakob Wennberg <jakob.wennberg@arcim.io>
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMUUom4fUk6zi4xYZSSfat

* feat(connect): Peppol through the connector: hosted proxy, instance transport, ownership ledger

Completes the Peppol upstream for self-hosted instances on the connector
(WS3): an instance with a connector key carrying the peppol scope and no
Qvalia keys of its own sends and receives e-invoices through Arcim's
contracted access point, the same way bank and Skatteverket already route.

Hosted: app/api/connect/peppol/[...path] speaks the PeppolTransport
operations (lookup, submit, status, evidence, recipient PUT/DELETE, inbound
list/xml) rather than proxying Qvalia paths, because the Qvalia account is
shared by every hosted company and every instance: reads must be scoped to
what the caller owns, and the inbound read endpoint is destructive for the
whole account. Ownership: a receiving registration is a ledger row (service
peppol, participant id in account_uids, sha256 in handle_hash so one key
holds a participant at a time); outbound submissions land in the new
connector_peppol_submissions table and gate status/evidence; inbound
documents are served from the hosted archive filtered by the participants
the key holds. Per-company quota (peppol_connections_per_company), the
shared PEPPOL_RECEIVING_MAX_REGISTRATIONS cap, and the global peppol rate
budget apply. Provider failures cross as CONNECTOR_UPSTREAM_ERROR with the
adapter's retryable flag (422 or 502).

Instance: lib/invoices/transports/connector.ts implements PeppolTransport
over that API and registers itself in connector mode (key present, no
QVALIA_* keys); getPeppolTransportAvailability() defaults to it when no
provider is selected, so an instance needs no PEPPOL_TRANSPORT_PROVIDER.
Webhooks are not brokered; the existing outbound status poll covers it.
Hosted is byte-identical: it has its own keys, so connector mode is never on.

Docs: SELF-HOSTING.md, SOVEREIGN.md, .env.example. Switch-on for third-party
instances stays gated on the Qvalia brokering-terms check; without the scope
every operation answers 403.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMUUom4fUk6zi4xYZSSfat
Signed-off-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>

* fix(connect): authorize Peppol participants per key, harden the proxy after review

Review follow-ups on #2177. Authorization: a key may only register (and send
as) participant identifiers Arcim recorded on the key at issuance
(connector_keys.peppol_participants, migration 20260902191000) or the
licensee's own org number, and a document may only be submitted as a sender
the key has registered; X-Connector-Company stays an opaque per-company ref.
Cap: the shared access-point cap now counts fresh pending reservations and is
re-checked after this request's own reservation, so concurrent registrations
cannot both pass. Inbound: both halves of the participant id are filtered in
the archive query (over-fetched, then exact-pair checked), so foreign rows
sharing an identifier cannot consume the limit. Delete: deregistration is a
required transport capability, checked before the ledger row is revoked, and
registration refuses an access point that cannot deregister. Instance
transport: the hosted URL must be https (loopback http only, same rule as
getConnectorConfig), and the response body is read inside the timeout window
with body-read failures mapped to retryable transport errors.
issue-connector-key.ts gains --peppol-participants and
--peppol-connections-per-company. Declined: NOT VALID on the ledger CHECK
(the table is empty until keys are issued; the validated scan is instant).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMUUom4fUk6zi4xYZSSfat
Signed-off-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>

* fix(connect): bind Peppol ownership to the instance company, query exact participant pairs

Second review round on #2177. Ownership is now (key, company_ref), not key
alone: a sender must be registered under the same company header, status and
evidence reads look the submission up under the header company, DELETE and
re-registration refuse a participant the key holds for another company, so
one company on a multi-company instance cannot act on another company's
registration through the shared key. The instance transport resolves the
owning company from its own peppol_deliveries / peppol_registrations rows
before status, evidence and deregistration calls (deps.companyFor,
deps.companyForParticipant, wired in transports/index.ts). Inbound listing
stays key-wide (the instance routes documents to its own companies by its
own registrations). The archive query now runs one exact-pair query per
scheme (scheme fixed, that scheme's identifiers), so neither foreign nor
cross-pair rows can consume the limit.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMUUom4fUk6zi4xYZSSfat
Signed-off-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>

---------

Signed-off-by: Jakob Wennberg <jakob.wennberg@arcim.io>
Signed-off-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

lib/connect/instance/__tests__/upstreams.test.ts

@@ -1,12 +1,14 @@
 import { describe, it, expect, afterEach, vi } from 'vitest'
 import {
   bankConnectorMode,
+  peppolConnectorMode,
   skatteverketConnectorMode,
   hasOwnEnableBankingCredentials,
+  hasOwnPeppolCredentials,
   hasOwnSkatteverketCredentials,
 } from '../upstreams'
 
-const ENV = ['GNUBOK_CONNECTOR_KEY', 'GNUBOK_CONNECT_URL', 'ENABLE_BANKING_PRIVATE_KEY', 'ENABLE_BANKING_APP_ID', 'ENABLE_BANKING_PRIVATE_KEY_PRODUCTION', 'ENABLE_BANKING_APP_ID_PRODUCTION', 'SKATTEVERKET_OAUTH2_CLIENT_ID', 'SKATTEVERKET_APIGW_CLIENT_ID'] as const
+const ENV = ['GNUBOK_CONNECTOR_KEY', 'GNUBOK_CONNECT_URL', 'ENABLE_BANKING_PRIVATE_KEY', 'ENABLE_BANKING_APP_ID', 'ENABLE_BANKING_PRIVATE_KEY_PRODUCTION', 'ENABLE_BANKING_APP_ID_PRODUCTION', 'SKATTEVERKET_OAUTH2_CLIENT_ID', 'SKATTEVERKET_APIGW_CLIENT_ID', 'QVALIA_API_KEY', 'QVALIA_PARTNER_REG_NO'] as const
 
 afterEach(() => vi.unstubAllEnvs())
 function clear() {
@@ -56,3 +58,15 @@ describe('connector-mode detection', () => {
     expect(skatteverketConnectorMode()).not.toBeNull()
   })
 })
+
+describe('peppol connector mode', () => {
+  it('is off without a key and off with own Qvalia keys, on otherwise', () => {
+    clear()
+    expect(peppolConnectorMode()).toBeNull()
+    vi.stubEnv('GNUBOK_CONNECTOR_KEY', 'gnubok_ck_x')
+    expect(peppolConnectorMode()).toEqual({ baseUrl: 'https://app.gnubok.se/api/connect/peppol', key: 'gnubok_ck_x' })
+    vi.stubEnv('QVALIA_PARTNER_REG_NO', '5560000000')
+    expect(hasOwnPeppolCredentials()).toBe(true)
+    expect(peppolConnectorMode()).toBeNull()
+  })
+})

lib/connect/instance/upstreams.ts

@@ -1,6 +1,7 @@
 import { getConnectorConfig } from './config'
 import {
   hasOwnEnableBankingCredentials,
+  hasOwnPeppolCredentials,
   hasOwnSkatteverketCredentials,
 } from '@/lib/entitlements/own-credentials'
 
@@ -24,7 +25,7 @@ export const CONNECTOR_COMPANY_HEADER = 'X-Connector-Company'
 export const CONNECTOR_UPSTREAM_AUTH_HEADER = 'X-Connector-Upstream-Authorization'
 export const CONNECTOR_UPSTREAM_CONTENT_TYPE_HEADER = 'X-Connector-Upstream-Content-Type'
 
-export { hasOwnEnableBankingCredentials, hasOwnSkatteverketCredentials }
+export { hasOwnEnableBankingCredentials, hasOwnPeppolCredentials, hasOwnSkatteverketCredentials }
 
 export interface ConnectorUpstream {
   /** Base URL to send upstream requests to (the hosted proxy). */
@@ -46,3 +47,15 @@ export function skatteverketConnectorMode(): ConnectorUpstream | null {
   if (!cfg) return null
   return { baseUrl: `${cfg.baseUrl}/api/connect/skv`, key: cfg.key }
 }
+
+/**
+ * Peppol through Arcim's contracted access point. Same rule as the other
+ * upstreams: an instance with its own Qvalia partner keys runs Peppol itself
+ * and is never routed here.
+ */
+export function peppolConnectorMode(): ConnectorUpstream | null {
+  if (hasOwnPeppolCredentials()) return null
+  const cfg = getConnectorConfig()
+  if (!cfg) return null
+  return { baseUrl: `${cfg.baseUrl}/api/connect/peppol`, key: cfg.key }
+}