mirror of
https://github.com/yincongcyincong/wechat_chatter.git
synced 2026-07-15 10:26:52 +08:00
93 lines
2.9 KiB
Go
93 lines
2.9 KiB
Go
package main
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import (
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"encoding/hex"
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"fmt"
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"strconv"
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"time"
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wxproto "github.com/yincongcyincong/weixin-macos/onebot/proto"
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"google.golang.org/protobuf/encoding/protowire"
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"google.golang.org/protobuf/proto"
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)
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// BuildImgMsgProto 构建发送图片消息的protobuf并返回hex编码的字符串
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func BuildImgMsgProto(sender, targetId, cdnKey, aesKey, md5Key string) (string, error) {
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// client_msg_id: targetId_timestamp_160_xwechat_3
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timestamp := time.Now().Unix()
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clientMsgId := targetId + "_" + strconv.FormatInt(timestamp, 10) + "_160_xwechat_3"
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// xml内容
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xmlContent := []byte("<msgsource><alnode><fr>1</fr></alnode></msgsource>")
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msg := &wxproto.WxSendImgMsg{
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Header: &wxproto.ImgMsgHeader{
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Flag: []byte{0x00},
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SessionId: int64(globalSessionId),
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ClientProof: globalClientProof,
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DeviceId: int64(globalDeviceId),
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Platform: []byte("UnifiedPCMac 26 arm64"),
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Version: 304,
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},
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ClientMsgId: &wxproto.WxString{Value: clientMsgId},
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Sender: &wxproto.WxString{Value: sender},
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Receiver: &wxproto.WxString{Value: targetId},
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Unknown5: 1524,
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// MsgType: 0, // proto3不会序列化0值，需要手动追加
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Unknown7: 1524,
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// Unknown8: 手动追加 [0x42, 0x04, 0x08, 0x00, 0x12, 0x00]
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Unknown9: 3,
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Xml: xmlContent,
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Unknown11: 1,
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Unknown12: 2,
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// Unknown13: 0, // 需要手动追加
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CdnKey: []byte(cdnKey),
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CdnKey2: []byte(cdnKey),
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AesKey: []byte(aesKey),
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Unknown18: 1,
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Unknown19: 2559,
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Unknown20: 2559,
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CdnKey3: []byte(cdnKey),
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Unknown22: 1524,
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Unknown23: 104,
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Unknown24: 58,
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AesKey2: []byte(aesKey),
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Md5Key: []byte(md5Key),
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Unknown28: 779219929,
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// Unknown30: 0, // 需要手动追加
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// Unknown36: 0, // 需要手动追加
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// Unknown41: 0, // 需要手动追加
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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 img 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 6 (msg_type=0): tag=0x30, value=0x00
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data = appendZeroVarintField(data, 6)
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// field 8 (ImgMsgExtra with field1=0, field2=""): [0x42, 0x04, 0x08, 0x00, 0x12, 0x00]
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data = append(data, 0x42, 0x04, 0x08, 0x00, 0x12, 0x00)
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// field 13 (unknown13=0): tag=0x68, value=0x00
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data = appendZeroVarintField(data, 13)
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// field 30 (unknown30=0): tag=[0xF0, 0x01], value=0x00
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data = appendZeroVarintField(data, 30)
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// field 36 (unknown36=0): tag=[0xA0, 0x02], value=0x00
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data = appendZeroVarintField(data, 36)
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// field 41 (unknown41=0): tag=[0xC8, 0x02], value=0x00
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data = appendZeroVarintField(data, 41)
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// 追加尾部的 \x00 字节
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data = append(data, 0x00)
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return hex.EncodeToString(data), nil
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}
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// appendZeroVarintField 追加一个值为0的varint字段
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func appendZeroVarintField(data []byte, fieldNum protowire.Number) []byte {
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data = protowire.AppendTag(data, fieldNum, protowire.VarintType)
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data = protowire.AppendVarint(data, 0)
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return data
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}
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