Test task for Server Engineer

Design and implement “Word of Wisdom” tcp server.

• TCP server should be protected from DDOS attacks with the Proof of Work (https://en.wikipedia.org/wiki/Proof_of_work), the challenge-response protocol should be used.
• The choice of the POW algorithm should be explained.
• After Proof Of Work verification, server should send one of the quotes from “word of wisdom” book or any other collection of the quotes.
• Docker file should be provided both for the server and for the client that solves the POW challenge

Don't forget to provide .env file!

cp .env.example .env

One can run the app using docker-compose.yml file provided or just using prepared Makefile

Best option is to use:

make restart

because it drops previous set of containers, rebuilds and runs

Challenge-response protocol is used.

HashCash PoW algorithm was used, because:

• It is enough for the formulated task
• Easy to implement
• Simplicity of validation on server side
• Possibility to dynamically manage complexity for client by changing required leading zeros count