Add MultiMsg.ApplyDown

mirai-core/src/commonMain/kotlin/network/protocol/data/proto/MultiMsg.kt

@@ -23,7 +23,7 @@ internal class MultiMsg : ProtoBuf {
 
     @Serializable
     internal class MultiMsgApplyDownReq(
-        @ProtoNumber(1) @JvmField val msgResid: ByteArray = EMPTY_BYTE_ARRAY,
+        @ProtoNumber(1) @JvmField val msgResid: String = "",
         @ProtoNumber(2) @JvmField val msgType: Int = 0,
         @ProtoNumber(3) @JvmField val srcUin: Long = 0L
     ) : ProtoBuf

mirai-core/src/commonMain/kotlin/network/protocol/packet/PacketFactory.kt

@@ -153,6 +153,7 @@ internal object KnownPacketFactories {
         Heartbeat.Alive,
         PbMessageSvc.PbMsgWithDraw,
         MultiMsg.ApplyUp,
+        MultiMsg.ApplyDown,
         NewContact.SystemMsgNewFriend,
         NewContact.SystemMsgNewGroup,
         ProfileService.GroupMngReq,

mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/MultiMsg.kt

@@ -151,4 +151,41 @@ internal class MultiMsg {
             }
         }
     }
+
+    object ApplyDown: OutgoingPacketFactory<ApplyDown.Response>("MultiMsg.ApplyDown") {
+        sealed class Response : Packet {
+
+            object MessageTooLarge : Response()
+        }
+
+        operator fun invoke(
+            client: QQAndroidClient,
+            buType: Int,
+            resId: String,
+            msgType: Int,
+        ) = buildOutgoingUniPacket(client) {
+            writeProtoBuf(
+                MultiMsg.ReqBody.serializer(),
+                MultiMsg.ReqBody(
+                    buType = buType, // 1: long, 2: 合并转发
+                    buildVer = "8.2.0.1296",
+                    multimsgApplydownReq = listOf(
+                        MultiMsg.MultiMsgApplyDownReq(
+                            msgResid =  resId,
+                            msgType = msgType,
+                        )
+                    ),
+                    netType = 3, // wifi=3, wap=5
+                    platformType = 9,
+                    subcmd = 2,
+                    termType = 5,
+                    reqChannelType = 2
+                )
+            )
+        }
+
+        override suspend fun ByteReadPacket.decode(bot: QQAndroidBot): Response {
+            return Response.MessageTooLarge
+        }
+    }
 }