支持Lagrange端FileMessage的接收

[EvolvedGhost]

在Onebot中没有定义文件的消息段，但是定义了group_upload事件，应该对应Mirai的FileMessage；但是因为历史缘故，Mirai的FileMessage实现为：public fun FileMessage(id: String, internalId: Int, name: String, size: Long)，name 与 size 只供本地使用, 发送消息时只会使用 id 和 internalId.

而Onebot的group_upload为

字段名	数据类型	可能的值	说明
time	number (int64)	-	事件发生的时间戳
self_id	number (int64)	-	收到事件的机器人 QQ 号
post_type	string	notice	上报类型
notice_type	string	group_upload	通知类型
group_id	number (int64)	-	群号
user_id	number (int64)	-	发送者 QQ 号
file	object	-	文件信息

其中 file 字段的内容如下：

字段名	数据类型	说明
id	string	文件 ID
name	string	文件名
size	number (int64)	文件大小（字节数）
busid	number (int64)	busid（目前不清楚有什么作用）

差距挺大，感觉无从下手

Onebot（Lagrange）日志为：

2024-11-25 17:25:38 D/Onebot: [Recv] <-- {"message_type":"group","sub_type":"normal","message_id":MSG_ID,"group_id":GROUP_ID,"user_id":USER_ID,"anonymous":null,"message":[],"raw_message":"","font":0,"sender":{"user_id":USER_ID,"nickname":"NICKNAME","card":"username","sex":"unknown","age":0,"area":"","level":"100","role":"owner","title":""},"time":1732526738,"self_id":BOT_ID,"post_type":"message"}
2024-11-25 17:25:38 D/Onebot: [Recv] <-- {"group_id":GROUP_ID,"user_id":USER_ID,"file":{"id":"/81xxxxxd-axx7-4xx0-8xx8-axxxxxxxxxxa","name":"xxx.exe","size":700000,"busid":0,"url":"FILE_URL"},"notice_type":"group_upload","time":1732526738,"self_id":BOT_ID,"post_type":"notice"}

Onebot（Lagrange）会传递一条空的消息提供message_id，再用group_upload提供文件详情

如果要作为FileMessage的话还需要将这两条消息组合起来才能正常进行回复、撤回等操作

感觉会很麻烦，先留个issue在这儿

[MrXiaoM]

写 go cqhttp 的文件支持的时候见过 busid，把它当成这个文件的id来使用就好了

对于这个 file 字段，写过类似的转换

[MrXiaoM]

busid 没用上，最后加了 FileMessageWithUrl，用于在消息接收时读取 url，我没搭 Lagrange 环境，试试能不能用

[EvolvedGhost]

busid 没用上，最后加了 FileMessageWithUrl，用于在消息接收时读取 url，我没搭 Lagrange 环境，试试能不能用

Lagrange的File方式应该又变了，现在是：

2024-12-19 11:39:12 D/Onebot: [Recv] <-- {"message_type":"group","sub_type":"normal","message_id":1023779931,"group_id":GID,"user_id":UID,"anonymous":null,"message":[{"type":"file","data":{"file_name":"XXX.jpg","file_hash":"","file_id":"/6eXXXXX-XXXX-XXXX-XXXX-1f486ac8ac6b","url":"https://njc-download.ftn.qq.com/ftn_handler/XXX/?fname="}}],"raw_message":"[CQ:file]","font":0,"sender":{"user_id":UID,"nickname":"username","card":"username","sex":"unknown","age":0,"area":"","level":"100","role":"owner","title":""},"time":1734579552,"self_id":SID,"post_type":"message"}
2024-12-19 11:39:12 D/Onebot: [Recv] <-- {"group_id":GID,"user_id":UID,"file":{"id":"/6eXXXXX-XXXX-XXXX-XXXX-1f486ac8ac6b","name":"XXX.jpg","size":88960,"busid":0,"url":"https://njc-download.ftn.qq.com/ftn_handler/XXX/?fname="},"notice_type":"group_upload","time":1734579552,"self_id":SID,"post_type":"notice"}

对应机器人的log是：

2024-12-19 11:39:12 V/Bot.SID: [TEST(GID)] username(UID) -> WrappedFileMessage(id=/6ef71c20-XXXX-XXXX-XXXX-1f486ac8ac6b, internalId=0, name=, size=0, url=https://njc-download.ftn.qq.com/ftn_handler/1XXXXX/?fname=)
2024-12-19 11:39:12 W/Bot.SID: 群文件上传事件找不到前置消息ID (来自群员 UID)

LagrangeDev/Lagrange.Core#708 (comment)

应该可以用正常方式进行获取了，不需要走Event事件