fix: resume queued delivery after sign-in (#266)

README.md

@@ -152,6 +152,10 @@ work finishes**; permission is requested only from that user gesture and the cho
 is stored for the confirmed account in the private background outbox database.
 Successful deliveries produce privacy-safe receipts that open the created issue or
 source conversation, while permanent validation failures open Drafts for recovery.
+Authentication expiry during a worker mutation is recoverable: the worker releases the
+claim without creating an Attention receipt, stops that drain, and keeps the original
+idempotency key. Loading the authenticated dashboard after signing in asks the worker
+to resume queued delivery automatically.
 Notification text never includes issue titles, comment bodies, or validation details.
 The preference is off by default, unsupported or denied browsers retain foreground
 reconciliation, and **Sign out & clear this device** removes the account-bound choice.

frontend/background-issue-sync.js

@@ -224,6 +224,10 @@ function createBackgroundIssueSync({ store, fetchJson, base = '' }) {
       return item.kind ? { message: delivered, receipt } : { issue: delivered, receipt };
     } catch (error) {
       const status = Number(error?.status || 0);
+      if (status === 401) {
+        await store.release(item.id);
+        throw error;
+      }
       if (status >= 400 && status < 500) {
         await store.fail(item.id, String(error?.message || 'Issue needs attention').slice(0, 240));
         return { attention: true, error, receipt: receiptFor(item, 'attention') };

frontend/service-worker.js

@@ -1,6 +1,6 @@
 const BASE = new URL('./', self.location.href).pathname;
 importScripts(BASE + 'static/background-issue-sync.js');
-const CACHE = 'stackchain-dashboard-shell-v17';
+const CACHE = 'stackchain-dashboard-shell-v18';
 const OUTAGE_STATUSES = new Set([500, 502, 503, 504]);
 const SHELL = [
   BASE,
@@ -96,6 +96,10 @@ self.addEventListener('sync', event => {
   if (event.tag === 'stackchain-issue-outbox-v1') event.waitUntil(flushAndNotify());
 });
 
+self.addEventListener('message', event => {
+  if (event.data?.type === 'stackchain-resume-outbox') event.waitUntil(flushAndNotify());
+});
+
 self.addEventListener('notificationclick', event => {
   event.notification.close();
   const route = String(event.notification.data?.route || '');

frontend/session.js

@@ -12,6 +12,7 @@
       sessionStorage: root.sessionStorage,
       indexedDB: root.indexedDB,
       caches: root.caches,
+      serviceWorker: root.navigator?.serviceWorker,
       location: root.location,
       onExpired: () => root.dispatchEvent(new CustomEvent('stackchain:session-expired')),
     });
@@ -19,13 +20,14 @@
     const attach = () => {
       const button = root.document.getElementById('sign-out');
       if (button) button.addEventListener('click', () => boundary.signOut());
+      boundary.resumeQueuedWork();
     };
     if (root.document.readyState === 'loading') root.document.addEventListener('DOMContentLoaded', attach);
     else attach();
     root.stackchainSession = boundary;
   }
 })(typeof window !== 'undefined' ? window : this, function createSessionBoundary({
-  cookie, origin, base, fetchImpl, localStorage, sessionStorage, indexedDB, caches, location,
+  cookie, origin, base, fetchImpl, localStorage, sessionStorage, indexedDB, caches, serviceWorker, location,
   onExpired = () => {},
 }) {
   const SAFE_METHODS = new Set(['GET', 'HEAD', 'OPTIONS']);
@@ -88,5 +90,12 @@
     }
   }
 
-  return { fetch: sessionFetch, signOut, clearPrivateDeviceData };
+  async function resumeQueuedWork() {
+    try {
+      const registration = await serviceWorker?.ready;
+      registration?.active?.postMessage({ type: 'stackchain-resume-outbox' });
+    } catch (_error) { /* Background Sync is optional; foreground delivery remains available. */ }
+  }
+
+  return { fetch: sessionFetch, signOut, clearPrivateDeviceData, resumeQueuedWork };
 });

tests/test_background_issue_sync.py

@@ -260,6 +260,44 @@ const fetchJson = async url => {{
     assert output["result"]["blocked"] == 1
 
 
+def test_session_expiry_during_delivery_releases_claim_without_attention():
+    script = f"""
+const createBackgroundIssueSync = require({json.dumps(str(SYNC))});
+const queued = [
+  {{id:'capture-auth',operationId:'stable-key',ownerLogin:'timmy',repository:'o/r',title:'Keep me',body:'',labelIds:[]}},
+  {{id:'capture-later',operationId:'later-key',ownerLogin:'timmy',repository:'o/r',title:'Do not try yet',body:'',labelIds:[]}},
+];
+const state = {{released:[],failed:[],mutationKeys:[]}};
+const store = {{
+  claimNext: async () => queued.shift() || null,
+  release: async id => state.released.push(id),
+  fail: async (id,message) => state.failed.push({{id,message}}),
+  countBlocked: async () => 0,
+}};
+const fetchJson = async (url, options={{}}) => {{
+  if (url === 'api/v1/background-identity') return {{login:'timmy'}};
+  state.mutationKeys.push(options.headers['Idempotency-Key']);
+  const error = new Error('Authentication required'); error.status = 401; throw error;
+}};
+(async () => {{
+  let error = null;
+  try {{ await createBackgroundIssueSync({{store,fetchJson}}).flush(); }}
+  catch (caught) {{ error = {{message:caught.message,status:caught.status}}; }}
+  process.stdout.write(JSON.stringify({{state,error}}));
+}})();
+"""
+    output = run_node(script)
+
+    assert output == {
+        "state": {
+            "released": ["capture-auth"],
+            "failed": [],
+            "mutationKeys": ["stable-key"],
+        },
+        "error": {"message": "Authentication required", "status": 401},
+    }
+
+
 def test_transient_delivery_failure_releases_claim_and_requests_another_sync():
     script = f"""
 const createBackgroundIssueSync = require({json.dumps(str(SYNC))});

tests/test_dashboard_session_frontend.py

@@ -14,7 +14,7 @@ SESSION_JS = ROOT / "frontend" / "session.js"
 def run_session_scenario(scenario: str) -> dict:
     harness = f"""
 const createSessionBoundary = require({json.dumps(str(SESSION_JS))});
-const state = {{ requests: [], removed: [], deletedDatabases: [], deletedCaches: [], assigned: '' }};
+const state = {{ requests: [], removed: [], deletedDatabases: [], deletedCaches: [], assigned: '', workerMessages: [] }};
 const storage = {{
   values: new Map([['stackchain.private', 'secret'], ['gitea.preference', 'keep']]),
   get length() {{ return this.values.size; }},
@@ -33,6 +33,7 @@ const boundary = createSessionBoundary({{
   sessionStorage: storage,
   indexedDB: {{ deleteDatabase: name => {{ state.deletedDatabases.push(name); return {{ onsuccess: null, onerror: null, onblocked: null }}; }} }},
   caches: {{ keys: async () => ['stackchain-dashboard-shell-v15', 'gitea-assets'], delete: async key => {{ state.deletedCaches.push(key); }} }},
+  serviceWorker: {{ ready: Promise.resolve({{ active: {{ postMessage: message => state.workerMessages.push(message) }} }}) }},
   location: {{ assign: value => {{ state.assigned = value; }} }},
 }});
 (async () => {{ {scenario} }})().catch(error => {{ console.error(error); process.exit(1); }});
@@ -72,6 +73,17 @@ process.stdout.write(JSON.stringify(state));
     assert result["assigned"] == "/dashboard/login"
 
 
+def test_authenticated_dashboard_load_requests_queued_delivery_resume():
+    result = run_session_scenario(
+        """
+await boundary.resumeQueuedWork();
+process.stdout.write(JSON.stringify(state));
+"""
+    )
+
+    assert result["workerMessages"] == [{"type": "stackchain-resume-outbox"}]
+
+
 @pytest.mark.anyio
 async def test_dashboard_loads_session_boundary_first_and_offers_sign_out():
     html = await dashboard()

tests/test_service_worker.py

@@ -68,6 +68,11 @@ async function dispatchSync(tag) {{
   listeners.sync({{ tag, waitUntil: promise => {{ pending = promise; }} }});
   if (pending) await pending;
 }}
+async function dispatchMessage(data) {{
+  let pending;
+  listeners.message({{ data, waitUntil: promise => {{ pending = promise; }} }});
+  if (pending) await pending;
+}}
 async function dispatchNotificationClick(route) {{
   let pending;
   listeners.notificationclick({{
@@ -86,10 +91,10 @@ async function dispatchNotificationClick(route) {{
     return json.loads(completed.stdout)
 
 
-def test_background_delivery_receipts_ship_in_a_new_shell_cache():
+def test_session_resume_flow_ships_in_a_new_shell_cache():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v17" in source
+    assert "stackchain-dashboard-shell-v18" in source
 
 
 def test_background_sync_event_flushes_closed_app_issue_outbox_only_for_its_tag():
@@ -104,6 +109,17 @@ def test_background_sync_event_flushes_closed_app_issue_outbox_only_for_its_tag(
     assert result["backgroundFlushes"] == 1
 
 
+def test_authenticated_page_message_resumes_queued_background_delivery():
+    result = run_worker_scenario(
+        """
+  await dispatchMessage({type:'stackchain-resume-outbox'});
+  process.stdout.write(JSON.stringify(state));
+"""
+    )
+
+    assert result["backgroundFlushes"] == 1
+
+
 def test_opted_in_background_sync_notifies_privately_and_receipt_tap_focuses_route():
     result = run_worker_scenario(
         """