Subscription Bot

Description

Telegram bot where users can subscribe to weather forecast notification. Every day at the chosen time at UTC timezone this bot sends what weather is expected today.

Requirements

Functional requirements:

1. User can subscribe to the weather forecast.
2. User can unsubscribe from the weather forecast.
3. User can update the time when he wants to receive the weather forecast.
4. User can update his location.
5. User can receive the weather forecast in his location every day at the chosen time.

Non-functional requirements:

1. The bot should be implemented using the Telegram Bot API.
2. The bot should use MongoDB for data storage.
3. Time should use UTC timezone.
4. Time should be implemented using the process.env.TZ variable.
5. The bot should use the OpenWeatherMap API to get the weather forecast.
6. The bot should use the cron library to schedule the sending of the weather forecast.
7. Cron and telegram bot should run in one process - to block application scalability.

How to use

1. Start the bot by sending /start command.
2. Send /subscribe command to subscribe to the weather forecast.
3. Send /unsubscribe command to unsubscribe from the weather forecast.
4. Send /update_time command to update the time when you want to receive the weather forecast.
5. Send /update_location command to update your location.

Commands description

1. /start - Sending to user greeting message and possible commands buttons.
2. /subscribe - Subscribing to the weather forecast.Running chain of questions to get the location and time when user wants to receive the weather forecast.
3. /unsubscribe - Unsubscribing from the weather forecast.
4. /update_time - Updating the time when user wants to receive the weather forecast.
5. /update_location - Updating the user location to get forecast in updated location.

Database Schema

The bot stores the user data in the MongoDB database.

User schema

Model User

• telegram_id - Uniq Telegram user id.
• location - User location.
• notification_time - Time when user wants to receive the weather forecast.

model User {
telegram_id      String   @id @map("_id")
location         Location
notification_time String
}

type Location {
lat Float
lon Float
}

Sequence diagram

Subscribe

Unsubscribe

Update location

Update time