Task 1: Implement Embedded Key-Value Storage for Bad Login Attempts

🎯 Goal

Implement an in-memory key-value storage to track bad login attempts and integrate it with an Authenticator class. This is useful for locking out users after too many failed login attempts.

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📦 Part 1.1: Implement Authenticator

You will complete three private methods that rely on the BadLoginAttemptsStorage.

✅ Step-by-step

Implement the following methods:

• increaseBadLoginAttemptsCounter(String email)
• isLockedOut(String email)
• resetCounter(String email)

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📦 Part 1.2: Implement EmbeddedBadLoginAttemptsStorage

This is a simple in-memory implementation using HashMap.

✅ Step-by-step

1. Create a field

private final Map<String, Integer> storage = new HashMap<>();

2. Implement the following methods:

• get(String key)
• put(String key, Integer value)
• increment(String key)
• remove(String key)

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🧪 Run tests to check your solution

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Task 2: Implement Redis-Based Key-Value Storage for Bad Login Attempts

🎯 Goal

Implement a Redis-backed key-value storage to track bad login attempts with an automatic expiration (TTL). This implementation uses RedisTemplate and ValueOperations to interact with Redis.

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📦 Part 2.1: Implement RedisBadLoginAttemptsStorage

You will complete methods to interact with Redis. Key operations should include get, put, increment, remove, and setting TTL.

✅ Step-by-step

Implement the following methods:

• get(String key)
• put(String key, Integer value)
• increment(String key)
• remove(String key)
• setTtl(String key)

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🧪 Run tests to check your solution

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Task 3: Implement Redis-Based Task Queue Using Redis Lists

🎯 Goal

Implement a Redis-based task queue where tasks are associated with a user. The queue will support operations to push tasks, pop tasks, and clear tasks for a given user. Redis will be used to store tasks in a list.

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📦 Part 3.1: Implement RedisTaskQueue

You will implement three methods: push, pop, and clear. The key operations will use Redis lists to enqueue and dequeue tasks.

✅ Step-by-step

Implement the following methods:

• push(String user, String task)
• pop(String user)
• clear(String user)

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🧪 Run tests to check your solution

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