Exchange telephone number for user id in Telegram

Question

I wrote a Telegram Bot in groovy and it was a piece of cake.

Now in order to register propper webhooks I need to get a hold of user's id.

I read, that I should call auth.sendCode method to start that process.

Are there any simpler alternatives to that?

If not, how can I invoke the sendCode with the smallest effort and possibly w/o any additional dependencies? Any examples or pointers using plain java or curl would be good.

Answer 1

After some research I ended up with a simple solution.

Instead of authenticating against the Telegram API over MTProto, I reversed the process. I implemented a new bot-command:

/login {my-user-id}

so that the user sends his id (can be some generated token later) in Telegram bot chat and the bot sends this message - along with Telegram user id! - over webhook to my server, where I do the matching and saving.

The implementation looks like this:

switch( json.message.text ){
  case ~/\/login \w+/: 
    String userId
    text.toLowerCase().eachMatch( /\/login (\w+)/ ){ userId = it[ 1 ] }
    String telegramUserId = json.message.from.id
    saveJoin userId, telegramUserId
    break
 }