From 8f1ba610fcc3d81d414cf165166d82350afaf6d1 Mon Sep 17 00:00:00 2001
From: Max Litruv Boonzaayer <litruv@gmail.com>
Date: Thu, 19 Feb 2026 18:07:40 +1100
Subject: [PATCH] feat(auth): include existing device ID in SSO and password
 login flows

---
 src/app/pages/auth/SSOLogin.tsx                | 6 ++++--
 src/app/pages/auth/login/PasswordLoginForm.tsx | 6 ++++++
 src/app/pages/auth/login/TokenLogin.tsx        | 2 ++
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/app/pages/auth/SSOLogin.tsx b/src/app/pages/auth/SSOLogin.tsx
index 3ff1a22..bd6df00 100644
--- a/src/app/pages/auth/SSOLogin.tsx
+++ b/src/app/pages/auth/SSOLogin.tsx
@@ -14,8 +14,10 @@ export function SSOLogin({ providers, redirectUrl, action, saveScreenSpace }: SS
   const baseUrl = discovery['m.homeserver'].base_url;
   const mx = useMemo(() => createClient({ baseUrl }), [baseUrl]);
 
-  const getSSOIdUrl = (ssoId?: string): string =>
-    mx.getSsoLoginUrl(redirectUrl, 'sso', ssoId, action);
+  const getSSOIdUrl = (ssoId?: string): string => {
+    const existingDeviceId = localStorage.getItem('cinny_device_id') ?? undefined;
+    return mx.getSsoLoginUrl(redirectUrl, 'sso', ssoId, action, existingDeviceId);
+  };
 
   const withoutIcon = providers
     ? providers.find(
diff --git a/src/app/pages/auth/login/PasswordLoginForm.tsx b/src/app/pages/auth/login/PasswordLoginForm.tsx
index 306e96c..59f93b1 100644
--- a/src/app/pages/auth/login/PasswordLoginForm.tsx
+++ b/src/app/pages/auth/login/PasswordLoginForm.tsx
@@ -126,6 +126,7 @@ export function PasswordLoginForm({ defaultUsername, defaultEmail }: PasswordLog
   useLoginComplete(loginState.status === AsyncStatus.Success ? loginState.data : undefined);
 
   const handleUsernameLogin = (username: string, password: string) => {
+    const existingDeviceId = localStorage.getItem('cinny_device_id') ?? undefined;
     startLogin(baseUrl, {
       type: 'm.login.password',
       identifier: {
@@ -133,6 +134,7 @@ export function PasswordLoginForm({ defaultUsername, defaultEmail }: PasswordLog
         user: username,
       },
       password,
+      device_id: existingDeviceId,
       initial_device_display_name: 'Paarrot',
     });
   };
@@ -144,6 +146,7 @@ export function PasswordLoginForm({ defaultUsername, defaultEmail }: PasswordLog
 
     const getBaseUrl = factoryGetBaseUrl(clientConfig, mxIdServer);
 
+    const existingDeviceId = localStorage.getItem('cinny_device_id') ?? undefined;
     startLogin(getBaseUrl, {
       type: 'm.login.password',
       identifier: {
@@ -151,10 +154,12 @@ export function PasswordLoginForm({ defaultUsername, defaultEmail }: PasswordLog
         user: mxIdUsername,
       },
       password,
+      device_id: existingDeviceId,
       initial_device_display_name: 'Paarrot',
     });
   };
   const handleEmailLogin = (email: string, password: string) => {
+    const existingDeviceId = localStorage.getItem('cinny_device_id') ?? undefined;
     startLogin(baseUrl, {
       type: 'm.login.password',
       identifier: {
@@ -163,6 +168,7 @@ export function PasswordLoginForm({ defaultUsername, defaultEmail }: PasswordLog
         address: email,
       },
       password,
+      device_id: existingDeviceId,
       initial_device_display_name: 'Paarrot',
     });
   };
diff --git a/src/app/pages/auth/login/TokenLogin.tsx b/src/app/pages/auth/login/TokenLogin.tsx
index 4c0382d..dc21dcc 100644
--- a/src/app/pages/auth/login/TokenLogin.tsx
+++ b/src/app/pages/auth/login/TokenLogin.tsx
@@ -54,9 +54,11 @@ export function TokenLogin({ token }: TokenLoginProps) {
   >(useCallback(login, []));
 
   useEffect(() => {
+    const existingDeviceId = localStorage.getItem('cinny_device_id') ?? undefined;
     startLogin(baseUrl, {
       type: 'm.login.token',
       token,
+      device_id: existingDeviceId,
       initial_device_display_name: 'Paarrot',
     });
   }, [baseUrl, token, startLogin]);