When the bot receives a photo message, it downloads the highest-resolution version of the photo and sets it as the chat photo for the chat the message was sent from. If the operation fails (e.g., due to missing admin rights), the bot sends an error message back to the user.

Arguments

Position	Value	Description
1	`BOT_TOKEN`	Telegram bot token

Optional arguments (any order after the token):

Value	Description
`debug`	Enable verbose debug logging
`testServer`	Connect to the Telegram test server instead of production

Bot Commands

None.

Capabilities

Downloads the largest available photo size from the incoming message
Calls setChatPhoto to apply the downloaded image as the chat's avatar
Returns a user-facing error message if the update fails
Runs via long polling

Launch

../gradlew run --args="BOT_TOKEN"

Note: The bot must be an administrator with Change group info permission in the target chat.