From ef388adc4fec84f7cf0a8d775e5728dd352eee44 Mon Sep 17 00:00:00 2001
From: Shantur Rathore <i@shantur.com>
Date: Tue, 17 Feb 2026 18:27:41 +0000
Subject: [PATCH] fix(server): avoid back to login after auth

Replace /login history entry on success and redirect authenticated /login to /, with no-store headers to prevent caching.
---
 .../src/server/routes/auth-pages/login.html   |  3 ++-
 packages/server/src/server/routes/auth.ts     | 19 ++++++++++++++++++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/packages/server/src/server/routes/auth-pages/login.html b/packages/server/src/server/routes/auth-pages/login.html
index c3f95ac8..5dea9c70 100644
--- a/packages/server/src/server/routes/auth-pages/login.html
+++ b/packages/server/src/server/routes/auth-pages/login.html
@@ -119,7 +119,8 @@
             showError(message || `Login failed (${res.status})`)
             return
           }
-          window.location.href = "/"
+          // Replace history entry so Back doesn't return to /login.
+          window.location.replace("/")
         } catch (e) {
           showError(e && e.message ? e.message : String(e))
         }
diff --git a/packages/server/src/server/routes/auth.ts b/packages/server/src/server/routes/auth.ts
index e47da74a..6bb7d3d3 100644
--- a/packages/server/src/server/routes/auth.ts
+++ b/packages/server/src/server/routes/auth.ts
@@ -51,7 +51,19 @@ function getTokenHtml(): string {
 }
 
 export function registerAuthRoutes(app: FastifyInstance, deps: RouteDeps) {
-  app.get("/login", async (_request, reply) => {
+  app.get("/login", async (request, reply) => {
+    // If already authenticated, don't show the login page.
+    const session = deps.authManager.getSessionFromRequest(request)
+    if (session) {
+      reply.redirect("/")
+      return
+    }
+
+    // Avoid caching the login page (helps with bfcache/back behavior).
+    reply.header("Cache-Control", "no-store")
+    reply.header("Pragma", "no-cache")
+    reply.header("Expires", "0")
+
     const status = deps.authManager.getStatus()
     reply.type("text/html").send(getLoginHtml(status.username))
   })
@@ -67,6 +79,11 @@ export function registerAuthRoutes(app: FastifyInstance, deps: RouteDeps) {
       return
     }
 
+    // Avoid caching the token bootstrap page.
+    reply.header("Cache-Control", "no-store")
+    reply.header("Pragma", "no-cache")
+    reply.header("Expires", "0")
+
     reply.type("text/html").send(getTokenHtml())
   })