From cfe89a4c51cf954bc3dc3eecb8b8d2d7cc96371c Mon Sep 17 00:00:00 2001
From: SHOUHE001 <kyoeitechno_001@icloud.com>
Date: Sat, 7 Nov 2026 01:40:20 +0900
Subject: [PATCH] connector: sync own read receipts from other LINE clients

Handle SEND_CHAT_CHECKED (operation 40) so that a chat read in the LINE
mobile app is also marked as read on Matrix.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 pkg/connector/consts.go            |  1 +
 pkg/connector/read_receipt_test.go | 74 ++++++++++++++++++++++++++++++
 pkg/connector/sync.go              | 32 +++++++++++++
 3 files changed, 107 insertions(+)
 create mode 100644 pkg/connector/read_receipt_test.go

diff --git a/pkg/connector/consts.go b/pkg/connector/consts.go
index 1dee41ed..0662133e 100644
--- a/pkg/connector/consts.go
+++ b/pkg/connector/consts.go
@@ -6,6 +6,7 @@ type OperationType int
 const (
 	OpSendMessage            OperationType = 25
 	OpReceiveMessage         OperationType = 26
+	OpSendChatChecked        OperationType = 40
 	OpSendChatRemoved        OperationType = 41
 	OpContactUpdate          OperationType = 49
 	OpReadReceipt            OperationType = 55
diff --git a/pkg/connector/read_receipt_test.go b/pkg/connector/read_receipt_test.go
new file mode 100644
index 00000000..065f6e3b
--- /dev/null
+++ b/pkg/connector/read_receipt_test.go
@@ -0,0 +1,74 @@
+package connector
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+
+	"maunium.net/go/mautrix/bridgev2"
+	"maunium.net/go/mautrix/bridgev2/database"
+	"maunium.net/go/mautrix/bridgev2/networkid"
+
+	"github.com/beeper/line/pkg/line"
+)
+
+func newOwnReadReceiptTestClient() *LineClient {
+	return &LineClient{
+		Mid: "Uown",
+		UserLogin: &bridgev2.UserLogin{
+			UserLogin: &database.UserLogin{ID: networkid.UserLoginID("Uown")},
+		},
+	}
+}
+
+func TestMakeOwnReadReceiptEvent(t *testing.T) {
+	lc := newOwnReadReceiptTestClient()
+
+	receipt, ok := lc.makeOwnReadReceiptEvent(line.Operation{
+		Type:        int(OpSendChatChecked),
+		Param1:      "Cgroup",
+		Param2:      "12345",
+		CreatedTime: json.Number("1700000000000"),
+	})
+	if !ok {
+		t.Fatal("receipt was rejected")
+	}
+
+	if receipt.GetType() != bridgev2.RemoteEventReadReceipt {
+		t.Fatalf("type = %v", receipt.GetType())
+	}
+	if want := (networkid.PortalKey{ID: "Cgroup", Receiver: "Uown"}); receipt.GetPortalKey() != want {
+		t.Fatalf("portal key = %+v, want %+v", receipt.GetPortalKey(), want)
+	}
+	if sender := receipt.GetSender(); !sender.IsFromMe || sender.Sender != "Uown" {
+		t.Fatalf("sender = %+v, want own login", sender)
+	}
+	if receipt.GetLastReceiptTarget() != "12345" {
+		t.Fatalf("last target = %q", receipt.GetLastReceiptTarget())
+	}
+	if !receipt.GetReadUpTo().IsZero() {
+		t.Fatalf("read up to = %v, want zero so an unknown target is not guessed", receipt.GetReadUpTo())
+	}
+	if want := time.UnixMilli(1700000000000); !receipt.GetTimestamp().Equal(want) {
+		t.Fatalf("timestamp = %v, want %v", receipt.GetTimestamp(), want)
+	}
+}
+
+func TestMakeOwnReadReceiptEventRejectsMalformedOperations(t *testing.T) {
+	lc := newOwnReadReceiptTestClient()
+
+	for _, tc := range []struct {
+		name string
+		op   line.Operation
+	}{
+		{name: "missing chat", op: line.Operation{Type: int(OpSendChatChecked), Param2: "12345"}},
+		{name: "missing message", op: line.Operation{Type: int(OpSendChatChecked), Param1: "Upeer"}},
+		{name: "another operation", op: line.Operation{Type: int(OpReadReceipt), Param1: "Upeer", Param2: "12345"}},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			if receipt, ok := lc.makeOwnReadReceiptEvent(tc.op); ok || receipt != nil {
+				t.Fatalf("got receipt %+v, ok %v", receipt, ok)
+			}
+		})
+	}
+}
diff --git a/pkg/connector/sync.go b/pkg/connector/sync.go
index 1b5662bf..f0b49bff 100644
--- a/pkg/connector/sync.go
+++ b/pkg/connector/sync.go
@@ -1997,6 +1997,16 @@ func (lc *LineClient) handleOperation(ctx context.Context, op line.Operation) {
 			lc.syncSingleChat(context.Background(), op)
 		}()
 
+	case OpSendChatChecked:
+		receipt, ok := lc.makeOwnReadReceiptEvent(op)
+		if !ok {
+			lc.UserLogin.Bridge.Log.Warn().
+				Int("op_type", op.Type).
+				Msg("Ignoring malformed own read receipt")
+			return
+		}
+		lc.UserLogin.Bridge.QueueRemoteEvent(lc.UserLogin, receipt)
+
 	case OpReadReceipt:
 		portalID := makePortalID(op.Param1)
 		senderID := makeUserID(op.Param2)
@@ -2387,6 +2397,28 @@ func (lc *LineClient) handleMemberLeft(chatMid, leaverMid string) {
 	lc.handleMemberLeaveWithSender(chatMid, leaverMid, lc.eventSenderForMID(leaverMid))
 }
 
+// makeOwnReadReceiptEvent converts SEND_CHAT_CHECKED, where param1 is the chat
+// MID and param2 is the last message this account read.
+func (lc *LineClient) makeOwnReadReceiptEvent(op line.Operation) (*simplevent.Receipt, bool) {
+	if OperationType(op.Type) != OpSendChatChecked || op.Param1 == "" || op.Param2 == "" {
+		return nil, false
+	}
+
+	ts := time.Now()
+	if timestamp, err := op.CreatedTime.Int64(); err == nil && timestamp > 0 {
+		ts = time.UnixMilli(timestamp)
+	}
+	return &simplevent.Receipt{
+		EventMeta: simplevent.EventMeta{
+			Type:      bridgev2.RemoteEventReadReceipt,
+			PortalKey: networkid.PortalKey{ID: makePortalID(op.Param1), Receiver: lc.UserLogin.ID},
+			Timestamp: ts,
+			Sender:    bridgev2.EventSender{IsFromMe: true, Sender: networkid.UserID(lc.UserLogin.ID)},
+		},
+		LastTarget: networkid.MessageID(op.Param2),
+	}, true
+}
+
 func (lc *LineClient) makeNotifiedMemberRemovalEvent(op line.Operation) (*simplevent.ChatInfoChange, bool) {
 	if OperationType(op.Type) != OpNotifiedDeleteOtherFromChat ||
 		!isChatMID(op.Param1) ||