group file download supported.

README.md

@@ -24,7 +24,7 @@ qq-android协议的golang实现 移植于mirai
 - [x] 小程序(暂只支持RAW)
 - [ ] 位置
 - [x] 合并转发
-- [x] 群文件(仅接收信息)
+- [x] 群文件(仅接受消息)
 
 #### 事件
 - [x] 好友消息
@@ -55,6 +55,7 @@ qq-android协议的golang实现 移植于mirai
 - [x] 处理好友请求
 - [x] 撤回群消息
 - [ ] 群公告设置
+- [x] 获取群文件下载链接
 - [x] 群设置 (全体禁言/群名)
 - [x] 修改群成员Card
 - [x] 修改群成员头衔

client/builders.go

@@ -893,3 +893,25 @@ func (c *QQClient) buildQuitGroupPacket(groupCode int64) (uint16, []byte) {
 	packet := packets.BuildUniPacket(c.Uin, seq, "ProfileService.GroupMngReq", 1, c.OutGoingPacketSessionId, EmptyBytes, c.sigInfo.d2Key, pkt.ToBytes())
 	return seq, packet
 }
+
+// OidbSvc.0x6d6_2
+func (c *QQClient) buildGroupFileDownloadReqPacket(groupCode int64, fileId string, busId int32) (uint16, []byte) {
+	seq := c.nextSeq()
+	body := &oidb.D6D6ReqBody{
+		DownloadFileReq: &oidb.DownloadFileReqBody{
+			GroupCode: groupCode,
+			AppId:     3,
+			BusId:     busId,
+			FileId:    fileId,
+		},
+	}
+	b, _ := proto.Marshal(body)
+	req := &oidb.OIDBSSOPkg{
+		Command:     1750,
+		ServiceType: 2,
+		Bodybuffer:  b,
+	}
+	payload, _ := proto.Marshal(req)
+	packet := packets.BuildUniPacket(c.Uin, seq, "OidbSvc.0x6d6_2", 1, c.OutGoingPacketSessionId, EmptyBytes, c.sigInfo.d2Key, payload)
+	return seq, packet
+}

client/client.go

@@ -2,6 +2,7 @@ package client
 
 import (
 	"crypto/md5"
+	"encoding/hex"
 	"errors"
 	"fmt"
 	"github.com/Mrs4s/MiraiGo/binary"
@@ -122,6 +123,7 @@ func NewClientMd5(uin int64, passwordMd5 [16]byte) *QQClient {
 			"ProfileService.Pb.ReqSystemMsgNew.Friend": decodeSystemMsgFriendPacket,
 			"MultiMsg.ApplyUp":                         decodeMultiApplyUpResponse,
 			"MultiMsg.ApplyDown":                       decodeMultiApplyDownResponse,
+			"OidbSvc.0x6d6_2":                          decodeOIDB6d6Response,
 		},
 		sigInfo:                &loginSigInfo{},
 		requestPacketRequestId: 1921334513,
@@ -207,6 +209,16 @@ func (c *QQClient) GetFriendList() (*FriendListResponse, error) {
 	return r, nil
 }
 
+func (c *QQClient) GetGroupFileUrl(groupCode int64, fileId string, busId int32) string {
+	i, err := c.sendAndWait(c.buildGroupFileDownloadReqPacket(groupCode, fileId, busId))
+	if err != nil {
+		return ""
+	}
+	url := i.(string)
+	url += "?fname=" + hex.EncodeToString([]byte(fileId))
+	return url
+}
+
 func (c *QQClient) SendGroupMessage(groupCode int64, m *message.SendingMessage) *message.GroupMessage {
 	imgCount := m.Count(func(e message.IMessageElement) bool { return e.Type() == message.Image })
 	msgLen := message.EstimateLength(m.Elements, 703)

client/decoders.go

@@ -1,6 +1,7 @@
 package client
 
 import (
+	"encoding/hex"
 	"errors"
 	"fmt"
 	"github.com/Mrs4s/MiraiGo/binary"
@@ -10,6 +11,7 @@ import (
 	"github.com/Mrs4s/MiraiGo/client/pb/longmsg"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
 	"github.com/Mrs4s/MiraiGo/client/pb/multimsg"
+	"github.com/Mrs4s/MiraiGo/client/pb/oidb"
 	"github.com/Mrs4s/MiraiGo/client/pb/structmsg"
 	"github.com/Mrs4s/MiraiGo/utils"
 	"github.com/golang/protobuf/proto"
@@ -750,3 +752,17 @@ func decodeMultiApplyDownResponse(c *QQClient, _ uint16, payload []byte) (interf
 	}
 	return &mt, nil
 }
+
+func decodeOIDB6d6Response(c *QQClient, _ uint16, payload []byte) (interface{}, error) {
+	pkg := oidb.OIDBSSOPkg{}
+	rsp := oidb.D6D6RspBody{}
+	if err := proto.Unmarshal(payload, &pkg); err != nil {
+		return nil, err
+	}
+	if err := proto.Unmarshal(pkg.Bodybuffer, &rsp); err != nil {
+		return nil, err
+	}
+	ip := rsp.DownloadFileRsp.DownloadIp
+	url := hex.EncodeToString(rsp.DownloadFileRsp.DownloadUrl)
+	return fmt.Sprintf("http://%s/ftn_handler/%s/", ip, url), nil
+}