fix(owner): preserve password whitespace during login

backend/src/api/routes/owner.test.ts

@@ -82,3 +82,36 @@ test('owner session route rejects cookies from an older credential generation',
     ownerServer.restore();
   }
 });
+
+test('owner login verifies the exact password string, including surrounding whitespace', async () => {
+  let receivedCredentials: [string, string] | undefined;
+  const ownerServer = await startOwnerRoutes({
+    verifyCredentials: async (username, password) => {
+      receivedCredentials = [username, password];
+      return true;
+    },
+  });
+
+  try {
+    const csrfResponse = await fetch(`${ownerServer.baseUrl}/owner/csrf`);
+    const { csrfToken } = await csrfResponse.json() as { csrfToken: string };
+    const csrfCookie = csrfResponse.headers.get('set-cookie')?.split(';', 1)[0];
+    assert.ok(csrfCookie);
+
+    const response = await fetch(`${ownerServer.baseUrl}/owner/login`, {
+      method: 'POST',
+      headers: {
+        'content-type': 'application/json',
+        cookie: csrfCookie,
+        'x-csrf-token': csrfToken,
+      },
+      body: JSON.stringify({ mqttUsername: ' owner ', mqttPassword: ' password ' }),
+    });
+
+    assert.equal(response.status, 200);
+    assert.deepEqual(receivedCredentials, ['owner', ' password ']);
+  } finally {
+    await ownerServer.close();
+    ownerServer.restore();
+  }
+});

frontend/src/pages/OwnerPortalPage.tsx

@@ -22,6 +22,8 @@ import {
   lastHopSeriesCache,
   linkBadge,
   nodeRoleLabel,
+  ownerLoginCredentials,
+  ownerLoginValidationError,
   publishOwnerSession,
   type LastHopStrengthPoint,
   type MappedPeer,
@@ -128,13 +130,14 @@ export const OwnerPortalPage: React.FC = () => {
 
   const handleLogin = (event: FormEvent) => {
     event.preventDefault();
-    if (!mqttUsername.trim() || !mqttPassword) {
+    const validationError = ownerLoginValidationError(mqttUsername, mqttPassword);
-      setError('Enter your MQTT username and password.');
+    if (validationError) {
+      setError(validationError);
       return;
     }
     setSubmitting(true);
     setError(null);
-    const loginUsername = mqttUsername.trim();
+    const credentials = ownerLoginCredentials(mqttUsername, mqttPassword);
     fetchOwnerCsrfToken()
       .then((csrfToken) => fetchJson<OwnerSessionResponse>('/api/owner/login', {
           method: 'POST',
@@ -142,10 +145,7 @@ export const OwnerPortalPage: React.FC = () => {
             'Content-Type': 'application/json',
             'X-CSRF-Token': csrfToken,
           },
-          body: JSON.stringify({
+          body: JSON.stringify(credentials),
-            mqttUsername: loginUsername,
-            mqttPassword,
-          }),
         }, {
           timeoutMs: 15_000,
           maxBytes: 2 * 1024 * 1024,
@@ -155,8 +155,8 @@ export const OwnerPortalPage: React.FC = () => {
       .then((json) => {
         lastHopSeriesCache.clear();
         setDashboard(json.dashboard);
-        setOwnerSessionKey(json.mqttUsername ?? loginUsername);
+        setOwnerSessionKey(json.mqttUsername ?? credentials.mqttUsername);
-        publishOwnerSession(json.mqttUsername ?? loginUsername);
+        publishOwnerSession(json.mqttUsername ?? credentials.mqttUsername);
         if (json.dashboard.nodes[0]?.node_id) {
           setSelectedNodeId(json.dashboard.nodes[0].node_id);
         }

frontend/src/pages/owner/ownerPortalModel.test.ts

@@ -9,8 +9,20 @@ import {
   isOwnerSessionResponse,
   isValidMapCoord,
   nodeRoleLabel,
+  ownerLoginCredentials,
+  ownerLoginValidationError,
 } from './ownerPortalModel.js';
 
+test('owner login trims only the username and preserves password whitespace', () => {
+  assert.equal(ownerLoginValidationError(' owner ', ' password '), null);
+  assert.deepEqual(ownerLoginCredentials(' owner ', ' password '), {
+    mqttUsername: 'owner',
+    mqttPassword: ' password ',
+  });
+  assert.match(ownerLoginValidationError('owner', '\tpassword') ?? '', /invalid characters/);
+  assert.match(ownerLoginValidationError('owner', 'x'.repeat(129)) ?? '', /too long/);
+});
+
 test('owner map coordinate policy rejects placeholders and invalid coordinates', () => {
   assert.equal(isValidMapCoord(51.5, -0.1), true);
   assert.equal(isValidMapCoord(0, 0), false);

frontend/src/pages/owner/ownerPortalModel.ts

@@ -21,6 +21,24 @@ export function nodeRoleLabel(role: number | null): string {
   return 'Repeater';
 }
 
+export type OwnerLoginCredentials = { mqttUsername: string; mqttPassword: string };
+
+export function ownerLoginValidationError(mqttUsername: string, mqttPassword: string): string | null {
+  const normalizedUsername = mqttUsername.trim();
+  if (!normalizedUsername || !mqttPassword) return 'Enter your MQTT username and password.';
+  if (normalizedUsername.length > 128 || mqttPassword.length > 128) {
+    return 'MQTT username or password is too long.';
+  }
+  if (/[\u0000-\u001F\u007F]/.test(normalizedUsername) || /[\u0000-\u001F\u007F]/.test(mqttPassword)) {
+    return 'MQTT username or password contains invalid characters.';
+  }
+  return null;
+}
+
+export function ownerLoginCredentials(mqttUsername: string, mqttPassword: string): OwnerLoginCredentials {
+  return { mqttUsername: mqttUsername.trim(), mqttPassword };
+}
+
 export type OwnerDashboard = {
   nodes: OwnerNode[];
 };