handle response from telegram bot api - node.js

Question

I am using this api: https://github.com/orzFly/node-telegram-bot
It should work like any other.
Now I want my Bot to have an option to update a string he keeps for some reason. so on "/update" the update function is called, where msg is a Message object (https://core.telegram.org/bots/api#message):
link = "something";
function update(msg) {
response = tg.sendMessage({
text: "Send a new URL, please",
chat_id: msg.chat.id,
reply_to_message_id: msg.message_id,
reply_markup: {
force_reply: true,
selective: true
}
});
console.log("response: " + response);
// on reply I want to update link
}
Now this bot asks me to provide a new string. The next answer in telegram is already an answer to the bots request, because of the force_reply.
How would I get this answer? 'response' here is a promise object and I don't know what to do with it.
After reading about Promises objects, I tried something like this:
response.then(function successHandler(result) {
tg.sendMessage({
text: "new URL is: I don't know",
chat_id: msg.chat.id
});
}, function failureHandler(error) {
colsole.log("error: " + error);
});
But it didn't work. In no way.
I just don't know where to get the reply Message object from.
I hope it's clear what I am asking. Otherwise let me know.

Answer 1

If I understood right, you're trying to get the next message from the user and treat it as the new string;
Problem is: response will contain the response from Telegram servers stating the result of the message you tried to send; it has nothing to do with the user's response to your message;
In order to do this, you need to control what was the last message your bot sent to a user and, based on that, decide how to handle that user's next message; it could look something like this:
link = "something";
states = {}
function update(msg) {
if (!states[msg.chat.id] || states[msg.chat.id] == 1) {
tg.sendMessage({
text: "Send a new URL, please",
chat_id: msg.chat.id,
reply_to_message_id: msg.message_id,
reply_markup: {
force_reply: true,
selective: true
}
}).then(() => {
states[msg.chat.id] = 2
console.log(`Asked a question to ${msg.chat.id}`);
});
} else {
link = msg.text;
tg.sendMessage({
text: `New URL is: ${link}`,
chat_id: msg.chat.id,
reply_to_message_id: msg.message_id
})
}
}

Answer 2

It looks like the result in the promise is the entire response from Telegram. So your result will be in result.result.text
The result variable will look like:
{
ok: true
result: {
message_id: x,
from: { ... }
chat: { ... }
date: x,
text: 'message'
}
}
This is unfortunate, I would have suggested the author only returns the result key.
var api = require('telegram-bot');
api = new api(<TOKEN>);
api.sendMessage({ chat_id: 0, text: 'test' }).then(function (result) {
console.log(result);
});
api.on('message', function (msg) {
console.log(msg); // <- will contain the reply
// msg.text
// msg.chat.id
// msg.from.id
});
api.start();