Docker-Licensed Calculator App

This project consists of a license control API and a simple calculator application. The calculator application shuts down when the license period expires.

Project Structure

licensed-calculator/ ├── license-api/ │ ├── Dockerfile │ ├── license-api.js │ ├── package.json │ └── start_time.json └── calculator-app/ ├── Dockerfile ├── calculator-app.js ├── package.json └── public/ └── index.html

## Prerequisites

Ensure you have the following installed:

- Docker
- Docker Compose
- Node.js (for local development)

## Setup and Running

Follow these steps to set up and run the project.

### Step 1: Clone the Repository

```bash
git clone https://github.com/sakiphan/Docker-Licence.git
cd Docker-Licence

Step 2: Start Services with Docker Compose

docker-compose up --build

This command will start both the license control API and the calculator application.

Step 3: Open the Application in Your Browser

Open your browser and navigate to http://localhost:3000 to use the calculator application.

License Control API

The license control API checks the validity of a license for a certain period (in this example, 2 minutes). The API runs at http://localhost:4000/check-license.

API Endpoint

• GET /check-license: Checks if the license is still valid. If the license has expired, it returns a 403 status code.

Example Response

When the license is valid:

{
  "message": "License is valid. Remaining time: 119.99599981307983 seconds"
}

When the license has expired:

{
  "message": "License has expired."
}

Calculator Application

The calculator application is integrated with the license control API. When the license period expires, the application will shut down.

User Interface

The calculator has a simple user interface with buttons for digits and basic arithmetic operations.

License Check

The application periodically checks the license status every 10 seconds. If the license has expired, it hides the calculator interface and displays an alert message.

Contributing

1. Fork this repository.
2. Create a new branch.
3. Commit your changes.
4. Push to the branch.
5. Open a pull request.