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@grammyjs/stateless-question

v4.0.0

Published

Create stateless questions to Telegram users working in privacy mode

Downloads

960

Readme

Stateless Question

Create stateless questions to Telegram users working in privacy mode

You want to keep the privacy of the user with Telegrams privacy mode enabled (by default), send users translated questions in their language and don't save the state what users are currently doing?

This library wants to solve this problem.

The basic idea is to send your question with a special text at the end. This text is invisible to the user but still visible for your bot. When the user replies to a message the message is checked. If it is containing this special text at the end it is an answer to the question. This way you can have many strings for the same questions as when having translations. You only have to make sure the uniqueIdentifier is unique within your bot.

Special thanks to @Ramin-Bateni and take a look on his explanation how this works if you like.

Install

npm install grammy @grammyjs/stateless-question

Usage

import {StatelessQuestion} from '@grammyjs/stateless-question';

const bot = new Bot(token);

const unicornQuestion = new StatelessQuestion('unicorns', ctx => {
	console.log('User thinks unicorns are doing:', ctx.message)
})

// Dont forget to use the middleware
bot.use(unicornQuestion.middleware())

bot.command('rainbows', async ctx => {
	let text
	if (ctx.session.language === 'de') {
		text = 'Was machen Einhörner?'
	} else {
		text = 'What are unicorns doing?'
	}

	return unicornQuestion.replyWithMarkdown(ctx, text)
})

// Or send your question manually (make sure to use a parse_mode and force_reply!)
bot.command('unicorn', async ctx => ctx.replyWithMarkdown('What are unicorns doing?' + unicornQuestion.messageSuffixMarkdown(), {parse_mode: 'Markdown', reply_markup: {force_reply: true}})
bot.command('unicorn', async ctx => ctx.replyWithHTML(    'What are unicorns doing?' + unicornQuestion.messageSuffixHTML(),     {parse_mode: 'HTML',     reply_markup: {force_reply: true}})

Additional State

When your question is specific for a certain topic then you can use the additionalState to remember that stateless with the message. For example when you want to know in which room an event is happening you can set the event as additionalState. This also helpful when working with telegraf-inline-menu to store the path to return the menu to.

const locationQuestion = new StatelessQuestion(
  "target",
  (ctx, additionalState) => {
    console.log("Location of", additionalState, "is", ctx.message.text);
    saveHeroLocation(additionalState, ctx.message.text);
  },
);

// Dont forget to use the middleware
bot.use(locationQuestion.middleware());

bot.command("batman", async (ctx) => {
  return locationQuestion.replyWithMarkdown(ctx, "Where is Batman?", "batman");
});

bot.command("superman", async (ctx) => {
  return locationQuestion.replyWithMarkdown(
    ctx,
    "Where is superman?",
    "superman",
  );
});

selective ForceReply

When using in groups in might be nice to only request a reply from the user starting the question. Telegram provides selected as an option for the ForceReply.

In order to make selected work you need to reply to a message (reply_to_message_id) or need to mention the user(s) which should reply to this.

await ctx.replyWithHTML(
  "What are unicorns doing?" + unicornQuestion.messageSuffixHTML(),
  {
    parse_mode: "HTML",
    reply_to_message_id: ctx.message.message_id,
    reply_markup: {
      force_reply: true,
      selective: true,
    },
  },
);

Known Issues

The ForceReply question is always shown in some Telegram Clients even long after the question has already answered

see #4

As of the design choices Telegram made to create ForceReply it's hard for a Telegram Client to know if a question is still relevant or not. As a workaround we can send ReplyKeyboardRemove as reply_markup with messages that do not require any other reply_markup (only one is possible for a message).

const unicornQuestion = new StatelessQuestion("unicorns", async (ctx) => {
  console.log("User thinks unicorns are doing:", ctx.message);
  await ctx.reply("if you think so...", {
    reply_markup: { remove_keyboard: true },
  });
});

Sending an abort/back (inline) button with the question message

see #1

Telegram allows only one reply_markup at a time. As this library relies on replies to a message ForceReply is already used as the reply_markup. In order to send an (inline) button with the same message it would require an (inline) keyboard markup. That would be a second reply_markup which Telegram sadly does not support.