Exercise - Chat Application

Build a chat application that fulfils these requirements:

Users can interact with the chat application with a Web Frontend (e.g. built using Blazor)
When navigation to the web application, users need to enter a nickname, that they want to use when they are chatting.
The application needs to ensure, that nicknames are unique. Two users can’t use the same nickname.
When a user has chosen a nickname a list of chatrooms will be displayed.
There should always be at least one chatroom with the name “General”.
User’s also need to have a way of creating new chatrooms and deleting existing chatrooms.
An existing chatroom can only be deleted if the chatroom is empty.
When entering a chatroom, users will start receiving messages sent in that chatroom.
Messages that have been sent before the user entered a chatroom, needn’t be displayed.
Users should also see the nicknames of all other users that are currently in the chatroom.
Users should be able to send messages in the chatroom. When a message is sent, every user in the chatroom should receive the message.
Messages displayed in the chat window should include the sender of the message.
You must not use polling for refreshing the chat messages. Choose one of the following techniques for sending updates to the clients:
- GraphQl Subscriptions
- gRPC Streams
- SignalR