mirror of
https://github.com/yincongcyincong/wechat_chatter.git
synced 2026-07-15 10:26:52 +08:00
98 lines
2.6 KiB
Go
98 lines
2.6 KiB
Go
package main
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import (
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"crypto/rand"
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"encoding/hex"
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"fmt"
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mathrand "math/rand"
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"strconv"
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"time"
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"github.com/yincongcyincong/weixin-macos/onebot/proto/wxproto"
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"google.golang.org/protobuf/proto"
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)
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// BuildVideoMsgProto 构建发送视频消息的protobuf并返回hex编码的字符串
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func BuildVideoMsgProto(sender, targetId, cdnKey, aesKey, md5Key, videoId string, duration int32, videoSize int32) (string, error) {
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// 生成16字节随机client_proof
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clientProof := make([]byte, 16)
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const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
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randBytes := make([]byte, 16)
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rand.Read(randBytes)
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for i := range clientProof {
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clientProof[i] = chars[int(randBytes[i])%len(chars)]
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}
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// 生成5字节varint范围的msgId (2^28 ~ 2^35-1)
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msgId := mathrand.Int63n(1<<35-1<<28) + (1 << 28)
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// header.unknown4: 同图片proto
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const headerUnknown4 int64 = -228321745
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// client_msg_id: targetId_timestamp_160_xwechat_1
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timestamp := time.Now().Unix()
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clientMsgId := targetId + "_" + strconv.FormatInt(timestamp, 10) + "_160_xwechat_1"
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// xml内容 (视频多了<cf>3</cf>)
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xmlContent := []byte("<msgsource><alnode><fr>1</fr><cf>3</cf></alnode></msgsource>")
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msg := &wxproto.WxSendVideoMsg{
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Header: &wxproto.VideoMsgHeader{
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Flag: []byte{0x00},
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MsgId: msgId,
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ClientProof: clientProof,
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Unknown4: headerUnknown4,
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SysInfo: []byte("UnifiedPCMac 26 arm64"),
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Unknown6: 118,
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},
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ClientMsgId: []byte(clientMsgId),
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Sender: []byte(sender),
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Receiver: []byte(targetId),
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Unknown5: 14764,
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Unknown6: 14764,
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Unknown7: &wxproto.VideoMsgExtra{
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Field1: 0,
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Field2: []byte{},
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},
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VideoSize: videoSize,
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VideoSize2: videoSize,
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Unknown10: &wxproto.VideoMsgExtra{
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Field1: 0,
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Field2: []byte{},
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},
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Duration: duration,
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Unknown12: 1,
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Unknown13: 2,
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// Unknown14: 0, // 需要手动追加
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Xml: xmlContent,
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CdnKey: []byte(cdnKey),
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AesKey: []byte(aesKey),
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Unknown18: 1,
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CdnKey2: []byte(cdnKey),
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Unknown20: 14764,
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Unknown21: 360,
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Unknown22: 203,
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AesKey2: []byte(aesKey),
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Md5Key: []byte(md5Key),
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VideoId: []byte(videoId),
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// Unknown38: 0, // 需要手动追加
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Md5Key2: []byte(md5Key),
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CdnKey3: []byte(cdnKey),
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AesKey3: []byte(aesKey),
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VideoSize3: videoSize,
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}
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data, err := proto.Marshal(msg)
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if err != nil {
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return "", fmt.Errorf("marshal video proto failed: %w", err)
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}
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// 手动追加proto3不会序列化的0值字段
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// field 14 (unknown14=0)
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data = appendZeroVarintField(data, 14)
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// field 38 (unknown38=0)
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data = appendZeroVarintField(data, 38)
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return hex.EncodeToString(data), nil
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}
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