From ce34ecdd4d35dcabcd706fd1740f95bac4794757 Mon Sep 17 00:00:00 2001
From: CODEX <codex@nodedc.local>
Date: Tue, 23 Jun 2026 18:57:36 +0300
Subject: [PATCH] Promote BIM share on Launcher login event

---
 frontend/dcViewer.js | 48 ++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 44 insertions(+), 4 deletions(-)

diff --git a/frontend/dcViewer.js b/frontend/dcViewer.js
index 02d3ca6..37acfe3 100644
--- a/frontend/dcViewer.js
+++ b/frontend/dcViewer.js
@@ -188,7 +188,8 @@ const SHARE_AUTH_GUEST_PARAM = "ndc_bim_guest";
 const SHARE_PROMOTION_TIMEOUT_MS = 4500;
 const SHARE_PROMOTION_RETRY_MS = 15000;
 const SESSION_STATUS_WATCH_INTERVAL_MS = 2500;
-const NODEDC_SESSION_EVENT_TYPE = "nodedc:session:logout";
+const NODEDC_SESSION_LOGOUT_EVENT_TYPE = "nodedc:session:logout";
+const NODEDC_SESSION_LOGIN_EVENT_TYPE = "nodedc:session:login";
 
 const acceptByType = {
   xkt: ".xkt",
@@ -632,6 +633,13 @@ const getShareTopLevelPromotionUrl = () => {
   return typeof promoteUrl === "string" && promoteUrl.trim() ? promoteUrl : "";
 };
 
+const buildLauncherOptionalServiceUrl = (nextPath = getCurrentReturnPath(), fallbackPath = nextPath) => {
+  const launchUrl = new URL("/api/services/bim-viewer/optional-launch", getLauncherUrl());
+  launchUrl.searchParams.set("returnTo", nextPath);
+  launchUrl.searchParams.set("fallbackTo", fallbackPath);
+  return launchUrl.toString();
+};
+
 const hasShareGuestAuthMarker = () => {
   try {
     return new URLSearchParams(window.location.search || "").get(SHARE_AUTH_GUEST_PARAM) === "1";
@@ -660,12 +668,20 @@ const clearShareStartupPending = () => {
 const isNodeDCSessionLogoutEvent = (value) => (
   value &&
   typeof value === "object" &&
-  value.type === NODEDC_SESSION_EVENT_TYPE &&
+  value.type === NODEDC_SESSION_LOGOUT_EVENT_TYPE &&
+  typeof value.id === "string"
+);
+
+const isNodeDCSessionLoginEvent = (value) => (
+  value &&
+  typeof value === "object" &&
+  value.type === NODEDC_SESSION_LOGIN_EVENT_TYPE &&
   typeof value.id === "string"
 );
 
 let nodeDCSessionSyncCleanup = null;
 let nodeDCLogoutHandling = false;
+let nodeDCLoginHandling = false;
 let nodeDCSessionWatchTimer = null;
 let nodeDCSessionWatchInFlight = false;
 
@@ -717,6 +733,24 @@ const handleNodeDCSessionLogout = async () => {
   window.location.replace(loginUrl.toString());
 };
 
+const handleNodeDCSessionLogin = () => {
+  if (nodeDCLoginHandling || runtimeSessionInfo.authenticated === true) return;
+  nodeDCLoginHandling = true;
+
+  const shareToken = getShareTokenFromPath();
+  if (shareToken) {
+    const promotionUrl = getShareTopLevelPromotionUrl() ||
+      buildLauncherOptionalServiceUrl(
+        `/share/${encodeURIComponent(shareToken)}`,
+        `/share/${encodeURIComponent(shareToken)}?${SHARE_AUTH_GUEST_PARAM}=1`
+      );
+    window.location.assign(promotionUrl);
+    return;
+  }
+
+  window.location.assign(buildLauncherOptionalServiceUrl());
+};
+
 const setupNodeDCSessionSync = () => {
   if (nodeDCSessionSyncCleanup || typeof document === "undefined") return;
 
@@ -736,8 +770,14 @@ const setupNodeDCSessionSync = () => {
   document.body.appendChild(iframe);
 
   const handleMessage = (event) => {
-    if (event.origin !== launcherOrigin || !isNodeDCSessionLogoutEvent(event.data)) return;
-    void handleNodeDCSessionLogout();
+    if (event.origin !== launcherOrigin) return;
+    if (isNodeDCSessionLogoutEvent(event.data)) {
+      void handleNodeDCSessionLogout();
+      return;
+    }
+    if (isNodeDCSessionLoginEvent(event.data)) {
+      handleNodeDCSessionLogin();
+    }
   };
 
   window.addEventListener("message", handleMessage);