Implement "Refuse private messages" client preference

2 files changed, 70 insertions, 2 deletions

diff --git a/hotline/transaction_handlers.go b/hotline/transaction_handlers.go
index 46fe362..abe2ea8 100644
--- a/hotline/transaction_handlers.go
+++ b/hotline/transaction_handlers.go
@@ -321,14 +321,29 @@ func HandleSendInstantMsg(cc *ClientConn, t *Transaction) (res []Transaction, er
 		reply.Fields = append(reply.Fields, NewField(fieldQuotingMsg, t.GetField(fieldQuotingMsg).Data))
 	}
 
-	res = append(res, *reply)
-
 	id, _ := byteToInt(ID.Data)
 	otherClient, ok := cc.Server.Clients[uint16(id)]
 	if !ok {
 		return res, errors.New("invalid client ID")
 	}
 
+	// Check if target user has "Refuse private messages" flag
+	flagBitmap := big.NewInt(int64(binary.BigEndian.Uint16(otherClient.Flags)))
+	if flagBitmap.Bit(userFLagRefusePChat) == 1 {
+		res = append(res,
+			*NewTransaction(
+				tranServerMsg,
+				cc.ID,
+				NewField(fieldData, []byte(string(otherClient.UserName)+" does not accept private messages.")),
+				NewField(fieldUserName, otherClient.UserName),
+				NewField(fieldUserID, *otherClient.ID),
+				NewField(fieldOptions, []byte{0, 2}),
+			),
+		)
+	} else {
+		res = append(res, *reply)
+	}
+
 	// Respond with auto reply if other client has it enabled
 	if len(otherClient.AutoReply) > 0 {
 		res = append(res,
diff --git a/hotline/transaction_handlers_test.go b/hotline/transaction_handlers_test.go
index e141c78..fd66fea 100644
--- a/hotline/transaction_handlers_test.go
+++ b/hotline/transaction_handlers_test.go
@@ -2302,6 +2302,7 @@ func TestHandleSendInstantMsg(t *testing.T) {
 						Clients: map[uint16]*ClientConn{
 							uint16(2): {
 								AutoReply: []byte(nil),
+								Flags:     []byte{0, 0},
 							},
 						},
 					},
@@ -2350,6 +2351,7 @@ func TestHandleSendInstantMsg(t *testing.T) {
 					Server: &Server{
 						Clients: map[uint16]*ClientConn{
 							uint16(2): {
+								Flags:     []byte{0, 0},
 								ID:        &[]byte{0, 2},
 								UserName:  []byte("User2"),
 								AutoReply: []byte("autohai"),
@@ -2393,6 +2395,57 @@ func TestHandleSendInstantMsg(t *testing.T) {
 			},
 			wantErr: assert.NoError,
 		},
+		{
+			name: "when client 2 has refuse private messages enabled",
+			args: args{
+				cc: &ClientConn{
+					Account: &Account{
+						Access: func() accessBitmap {
+							var bits accessBitmap
+							bits.Set(accessSendPrivMsg)
+							return bits
+						}(),
+					},
+					ID:       &[]byte{0, 1},
+					UserName: []byte("User1"),
+					Server: &Server{
+						Clients: map[uint16]*ClientConn{
+							uint16(2): {
+								Flags:    []byte{255, 255},
+								ID:       &[]byte{0, 2},
+								UserName: []byte("User2"),
+							},
+						},
+					},
+				},
+				t: NewTransaction(
+					tranSendInstantMsg,
+					&[]byte{0, 1},
+					NewField(fieldData, []byte("hai")),
+					NewField(fieldUserID, []byte{0, 2}),
+				),
+			},
+			wantRes: []Transaction{
+				*NewTransaction(
+					tranServerMsg,
+					&[]byte{0, 1},
+					NewField(fieldData, []byte("User2 does not accept private messages.")),
+					NewField(fieldUserName, []byte("User2")),
+					NewField(fieldUserID, []byte{0, 2}),
+					NewField(fieldOptions, []byte{0, 2}),
+				),
+				{
+					clientID:  &[]byte{0, 1},
+					Flags:     0x00,
+					IsReply:   0x01,
+					Type:      []byte{0x0, 0x6c},
+					ID:        []byte{0, 0, 0, 0},
+					ErrorCode: []byte{0, 0, 0, 0},
+					Fields:    []Field(nil),
+				},
+			},
+			wantErr: assert.NoError,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {