exchange-bot

A small Java Spring Boot Telegram bot that fetches official exchange rates from the Central Bank of Russia (CBR) and shows basic weather information using a public weather API. The project is minimal and intended for development or small demos.

What it does

• Fetches USD and EUR official rates from the CBR XML feed and returns them on /usd and /eur commands.
• Provides a simple /weather command: the bot asks for a city name and returns the current temperature (°C) from WeatherAPI.
• Runs as a Telegram bot using the telegrambots library and OkHttp for HTTP calls.

Key files / classes

• src/main/java/de/oyehiazarian/exchange_bot/ExchangeBotApplication.java — Spring Boot entry point.
• src/main/java/de/oyehiazarian/exchange_bot/bot/ExchangeRatesBot.java — Telegram bot with commands (/start, /help, /usd, /eur, /weather).
• src/main/java/de/oyehiazarian/exchange_bot/client/CbrClient.java — HTTP client using OkHttp to get CBR XML and weather JSON.
• src/main/java/de/oyehiazarian/exchange_bot/service/impl/ExchangeRatesServiceImpl.java — parses CBR XML to extract rates.
• src/main/java/de/oyehiazarian/exchange_bot/service/impl/WeatherServiceImpl.java — parses weather JSON to get temperature.

Configuration The project reads a few properties from src/main/resources/application.properties:

• bot.token — Telegram bot token (currently present in the file; remove before sharing publicly).
• cbr.currency.rates.xml.url — CBR XML URL (default: http://www.cbr.ru/scripts/XML_daily.asp).
• api.key — WeatherAPI key (currently present in the file; keep secrets out of the repo).

Quick start

1. Requirements: Java 21, Maven 3.6+, Internet access.
2. Build:

mvn clean package -DskipTests

3. Run:

java -jar target/exchange-bot-0.0.1-SNAPSHOT.jar

Or run with Maven during development:

mvn spring-boot:run

Notes and precautions

• The repository currently contains secrets (Telegram token and API key) in application.properties. Remove or replace them and use environment variables or an external config for production.
• Use the bot in test mode (or with a test Telegram bot) before using it in production.
• The bot username returned by the code is exchange_money001bot (see ExchangeRatesBot#getBotUsername).