Open Exchange messages in Dock Chats (#137)

ddiff --git a/deploy/nginx/openvibe.exchange.conf b/deploy/nginx/openvibe.exchange.conf
iindex 5b011d2..e5489ca 100644
---- a/deploy/nginx/openvibe.exchange.conf
++++ b/deploy/nginx/openvibe.exchange.conf
@@@ -78,6 +78,13 @@ server {
          proxy_pass http://127.0.0.1:5150;
      }
  
++    # The Dock token is fetched on signed-in page views; give it the session probe's budget.
++    location = /auth/navbar-token {
++        limit_req zone=exchange_api burst=30 nodelay;
++        limit_req_status 429;
++        proxy_pass http://127.0.0.1:5150;
++    }
++
      location /auth/ {
          limit_req zone=exchange_auth burst=10 nodelay;
          limit_req_status 429;
ddiff --git a/server/app.js b/server/app.js
iindex 66a905c..4adbfc2 100644
---- a/server/app.js
++++ b/server/app.js
@@@ -167,7 +167,7 @@ async function createApp(opts = {}) {
      app.use(sso.middleware());
  
      // ── Sign-in (OAuth2 + PKCE client of OpenVibe.Network) ──
--    app.use('/auth/', rateLimit({ windowMs: 15 * 60_000, limit: 60, standardHeaders: true, legacyHeaders: false }));
++    app.use('/auth/', rateLimit({ windowMs: 15 * 60_000, limit: 60, skip: (req) => req.path === '/me' || req.path === '/navbar-token', standardHeaders: true, legacyHeaders: false }));
      app.use('/auth', sso.routes());
      { const legal = require('openvibe-shared/legal'); app.get(legal.PATHS, legal.handler({ id: 'exchange', service: 'exchange', host: 'openvibe.exchange', name: 'OpenVibe.Exchange', profile: 'ugc' })); }
  
ddiff --git a/server/auth/sso.js b/server/auth/sso.js
iindex 81cbcd2..94a4444 100644
---- a/server/auth/sso.js
++++ b/server/auth/sso.js
@@@ -183,6 +183,16 @@ function createSso({ config, keys, fetchImpl = globalThis.fetch, now = () => Dat
              return res.json({ user: meOf(claims) });
          });
  
++        // The navbar needs a Network access token for the Dock. Keep /auth/me's
++        // profile response token-free; this same-origin answer is never cached.
++        r.get('/navbar-token', async (req, res) => {
++            res.set('Cache-Control', 'private, no-store');
++            const token = sso.extractToken(req);
++            const claims = await sso.verify(token);
++            if (!claims) return res.status(401).json({ error: 'Not signed in' });
++            return res.json({ token, expires_at: claims.exp ? claims.exp * 1000 : null });
++        });
++
          // Sign-out stays a same-site action: another site cannot sign a person out.
          const sameOriginRequest = (req) => {
              const site = String(req.get('sec-fetch-site') || '');
ddiff --git a/server/render/layout.js b/server/render/layout.js
iindex c904ee5..d8e62e4 100644
---- a/server/render/layout.js
++++ b/server/render/layout.js
@@@ -71,6 +71,7 @@ function renderPage(o) {
          history: { type: 'page', title: o.title || SITE_NAME },
          silentLogin: `${o.config.baseUrl}/auth/login?silent=1&next={url}`,
          sessionUrl: '/auth/me',
++        tokenUrl: '/auth/navbar-token',
          loginUrl: '/auth/login?next={path}',
          logoutUrl: '/auth/logout?next={path}',
          notificationsRealtime: true,
ddiff --git a/test/sso.test.js b/test/sso.test.js
iindex 0511cc7..4038208 100644
---- a/test/sso.test.js
++++ b/test/sso.test.js
@@@ -42,6 +42,11 @@ const { sanitizeNext } = require('../server/auth/sso');
          const me = await t.get('/auth/me', { cookie: `ov_token=${at}` });
          assert.strictEqual(me.json().user.username, 'kim');
          assert.ok(!me.text.includes(at), '/auth/me never returns the token');
++        const nav = await t.get('/auth/navbar-token', { cookie: `ov_token=${at}` });
++        assert.strictEqual(nav.status, 200);
++        assert.strictEqual(nav.json().token, at, 'the Dock receives the verified Network token');
++        assert.strictEqual(nav.headers.get('cache-control'), 'private, no-store');
++        assert.strictEqual((await t.get('/auth/navbar-token')).status, 401, 'a guest receives no token');
      });
  
      await check('a wrong state, a verifier that does not match, or no flow cookie starts the sign-in once more', async () => {