电报API（不是Bot！）：如何通过链接获取聊天/频道ID？

Question

I'm using library TLSharp on C# and writing Telegram client, and at some moment I got stuck.

I have a link to chat/channel, for instance, https://t.me/joinchat/some-string , and I'd like to get info about the chat/channel or join it. But you can do that only having chat_id, which I don't know how to get.

Firstly I thought about contacts.resolveUsername and passing it "some-string" from the link. But it doesn't work, saying that the username is invalid.

Is there any way to get ID of a group? And was it on purpose to make it so complicated to get info about groups?

Thanks

Answer 1

Well, I've found the solution (partial, see the end). I'm using this schema, to let you know.

1. First of all we need to send RPC messages.checkChatInvite with parameter hash set to last part of your link ("some-string" in my case).

2. A response of type TLChatInvite arrives. It will contain primary info about the group: it's type (chat or channel?), participant count and, if you're lucky, they themselves as Vector.

(This point below was the problem of mine)

3. Call the RPC messages.importChatInvite with the same parameter hash. It returns TLUpdates or TLUpdatesCombined object, which will contain a vector of TLChat objects. We will need to use the first (don't forget to check the vector for emptiness, though, just in case).

However, messages.importChatInvite will make the current user join the group. How to get the ID of the group without getting joined to it I haven't got a clue. Though, this thing would fit for my client.

Frankly said, I'm disappointed it consumed so much time for such a trivial thing.