Spring Boot Chain of Responsibility Pattern Example: Hash Resolving Service

This project demonstrates the Chain of Responsibility Pattern in a Spring Boot application.
The goal is to resolve which hashing algorithm (e.g., MD5, SHA1, SHA256, etc.) was used to generate a given hash, based on the provided plain text.

---

How It Works

• The API accepts a plain text and a hashed value.
• A chain of handlers (each responsible for a different algorithm) is executed.
• When a match is found, the chain returns the algorithm name.

---

API Endpoint

Example Request

curl --location 'http://localhost:8080/hash/resolve' \
--header 'Content-Type: application/json' \
--data '{
  "text": "hello world",
  "hash": "5eb63bbbe01eeed093cb22bb8f5acdc3"
}'

Example Response

{
  "algorithm": "MD5"
}

---

Chain of Responsibility Implementation

Each hashing algorithm is represented by a Chain Step:

• MD5HashResolveChainStep
• SHA1HashResolveChainStep
• SHA224HashResolveChainStep
• SHA256HashResolveChainStep
• SHA384HashResolveChainStep
• SHA512HashResolveChainStep

The chain is managed by the HashResolveChainHandler, which executes each step in order until a match is found.

---

Running the Project

1. Clone this repository:

git clone https://github.com/ercansormaz/chain-of-responsibility-pattern.git

2. Navigate to the project folder and build:

mvn clean install

3. Run the application:

mvn spring-boot:run

4. Test the endpoint (example above)

---

📚 Further Reading

You can read a detailed explanation of this project and the Chain of Responsibility Pattern in the blog post here:
👉 Read the Blog Post

---

🤝 Contributing

Contributions are welcome! Feel free to fork the repo, submit pull requests or open issues.

---

📜 License

This project is licensed under the MIT License.