From 8193549abaad092161ea671156abf31cd608fb53 Mon Sep 17 00:00:00 2001
From: hailin <hailin.zhao@gdzx.xyz>
Date: Wed, 31 Dec 2025 04:13:29 -0800
Subject: [PATCH] fix(co-sign): update participants list from session_started
 event
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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- Add logic in handleCoSignStart to update participants from event.selectedParties
- Fix initiator immediate trigger to use other_parties + self instead of incomplete participants list
- Add debug logging for participant list updates
- Ensures all parties have correct participant list before TSS signing starts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 .../service-party-app/electron/main.ts        | 39 ++++++++++++++++++-
 1 file changed, 37 insertions(+), 2 deletions(-)

diff --git a/backend/mpc-system/services/service-party-app/electron/main.ts b/backend/mpc-system/services/service-party-app/electron/main.ts
index 25ac7f37..5fd6c471 100644
--- a/backend/mpc-system/services/service-party-app/electron/main.ts
+++ b/backend/mpc-system/services/service-party-app/electron/main.ts
@@ -821,6 +821,32 @@ async function handleCoSignStart(event: {
   // 标记签名开始
   signInProgressSessionId = event.sessionId;
 
+  // 从 event.selectedParties 更新参与者列表（类似 keygen 的 handleSessionStart）
+  // 这确保我们使用的是实际加入会话的参与者，而不是预设的列表
+  if (event.selectedParties && event.selectedParties.length > 0) {
+    const myPartyId = grpcClient?.getPartyId();
+    const updatedParticipants: Array<{ partyId: string; partyIndex: number; name: string }> = [];
+
+    event.selectedParties.forEach((partyId, index) => {
+      // 查找已有的参与者信息
+      const existingParticipant = activeCoSignSession?.participants.find(p => p.partyId === partyId);
+      updatedParticipants.push({
+        partyId: partyId,
+        partyIndex: existingParticipant?.partyIndex ?? (index + 1),
+        name: partyId === myPartyId ? '我' : (existingParticipant?.name || `参与方 ${index + 1}`),
+      });
+    });
+
+    // 按 partyIndex 排序
+    updatedParticipants.sort((a, b) => a.partyIndex - b.partyIndex);
+
+    activeCoSignSession.participants = updatedParticipants;
+    console.log('[CO-SIGN] Updated participants from session_started event:', updatedParticipants.map(p => ({
+      partyId: p.partyId.substring(0, 8),
+      partyIndex: p.partyIndex,
+    })));
+  }
+
   // 获取 share 数据
   const share = database?.getShare(activeCoSignSession.shareId, activeCoSignSession.sharePassword);
   if (!share) {
@@ -1625,6 +1651,7 @@ function setupIpcHandlers() {
 
         if (joinResult?.success) {
           // 设置活跃的 Co-Sign 会话信息
+          // 注意：这里只初始化发起者自己，其他参与者会在 session_started 事件中从 selectedParties 更新
           const signParticipants: Array<{ partyId: string; partyIndex: number; name: string }> = [];
 
           // 添加发起方
@@ -1666,8 +1693,13 @@ function setupIpcHandlers() {
 
           if (sessionStatus === 'in_progress') {
             debugLog.info('main', 'Session already in_progress, triggering sign immediately');
+            // 从 joinResult.other_parties 获取其他参与者，加上发起者自己
+            // 因为此时 activeCoSignSession.participants 只有发起者自己
+            const otherParties = joinResult.other_parties || [];
+            const selectedParties = [partyId, ...otherParties.map((p: { party_id: string }) => p.party_id)];
+            console.log('[CO-SIGN] Initiator using other_parties + self:', selectedParties.map((id: string) => id.substring(0, 8)));
+
             setImmediate(async () => {
-              const selectedParties = activeCoSignSession?.participants.map(p => p.partyId) || [];
               await handleCoSignStart({
                 eventType: 'session_started',
                 sessionId: result.session_id,
@@ -1807,8 +1839,11 @@ function setupIpcHandlers() {
 
         if (sessionStatus === 'in_progress') {
           debugLog.info('main', 'Session already in_progress, triggering sign immediately');
+          // 使用 activeCoSignSession.participants（已从 other_parties + 自己构建）
+          const selectedParties = activeCoSignSession?.participants.map(p => p.partyId) || [];
+          console.log('[CO-SIGN] Participant using activeCoSignSession.participants:', selectedParties.map((id: string) => id.substring(0, 8)));
+
           setImmediate(async () => {
-            const selectedParties = activeCoSignSession?.participants.map(p => p.partyId) || [];
             await handleCoSignStart({
               eventType: 'session_started',
               sessionId: params.sessionId,