refactoring + add node app

Author: Artemiy3

.github/workflows/app-python-ci.yml

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+name: Node.js CI
+
+on:
+  push:
+    paths:
+      - 'app_node/**'
+      - '.github/workflows/node-ci.yml'
+  pull_request:
+    paths:
+      - 'app_node/**'
+      - '.github/workflows/node-ci.yml'
+
+defaults:
+  run:
+    working-directory: ./app_node # Set the default directory of the Node.js project
+
+jobs:
+
+  lint-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code repository
+        uses: actions/checkout@v2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14' # Change to your preferred Node.js version
+
+      - name: Install dependencies
+        run: |
+          npm install
+
+      - name: Lint with ESLint
+        run: |
+          npx eslint .
+
+      - name: Run tests
+        run: |
+          npx mocha test.js
+
+  security-check:
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    steps:
+      - name: Checkout code repository
+        uses: actions/checkout@v2
+
+      - name: Run Snyk to check for vulnerabilities
+        uses: snyk/actions/node@master
+        continue-on-error: true # To make sure that SARIF upload gets called
+        env:
+          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
+        with:
+          args: --all-projects --sarif
+
+  build-and-push:
+      needs: [lint-and-test, security-check]
+      runs-on: ubuntu-latest
+
+      steps:
+
+        - name: Checkout code repository
+          uses: actions/checkout@v2
+
+        - name: Set up Docker Buildx
+          uses: docker/setup-buildx-action@v3
+
+        - name: Login to Docker Hub
+          uses: docker/login-action@v1
+          with:
+            username: ${{ secrets.DOCKER_USERNAME }}
+            password: ${{ secrets.DOCKER_PASSWORD }}
+
+        - name: Build and push Docker image
+          run: |
+            docker buildx build -t m4k4rich/random-node-app:latest .
+            docker buildx build --push -t m4k4rich/random-node-app:latest .
+          working-directory: ./app_node # Change to your project directory

.github/workflows/node-ci.yml

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+name: Python CI
+
+on:
+  push:
+    paths:
+      - 'app_python/**'
+      - '.github/workflows/python-ci.yml'
+  pull_request:
+    paths:
+      - 'app_python/**'
+      - '.github/workflows/python-ci.yml'
+
+defaults:
+  run:
+    working-directory: ./app_python # We set the default directory of python project
+
+jobs:
+
+  lint-and-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.10"]
+
+    steps:
+      - name: Checkout code repository
+        uses: actions/checkout@v2
+
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+          cache-dependency-path: |
+            ./app_python/requirements.txt
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt  
+
+      - name: Lint with flake8
+        run: |
+          pip install flake8
+          flake8 .
+
+      - name: Run unit tests
+        run: |
+          python test_app.py
+
+  security-check:
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    steps:
+      - name: Checkout code repository.
+        uses: actions/checkout@v3
+
+      - name: Check for vulnerabilities using Snyk
+        uses: snyk/actions/python-3.10@master
+        continue-on-error: true # To make sure that SARIF upload gets called
+        env:
+          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
+        with:
+          args:
+                --package-manager=pip
+                --skip-unresolved
+                --file=app_python/requirements.txt
+
+  build-and-push:
+      needs: [lint-and-test, security-check]
+      runs-on: ubuntu-latest
+
+      steps:
+
+        - name: Checkout code repository
+          uses: actions/checkout@v2
+
+        - name: Set up Docker Buildx
+          uses: docker/setup-buildx-action@v3
+
+        - name: Login to Docker Hub
+          id: login
+          uses: docker/login-action@v1
+          with:
+            registry: docker.io
+            username: ${{ secrets.DOCKER_USERNAME }}
+            password: ${{ secrets.DOCKER_PASSWORD }}
+
+        - name: Build Docker image
+          run: |
+            docker buildx build -t m4k4rich/time-python-app:latest .
+            docker buildx build --push -t m4k4rich/time-python-app:latest .
+          working-directory: ./app_python  # Change to your project directory
+
+        - name: Check Docker Hub Login Status
+          run: echo "Logged in to Docker Hub successfully."
+
+        - name: Logout from Docker Hub
+          run: docker logout
+
+

.github/workflows/python-ci.yml

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+env:
+  browser: true
+  commonjs: true
+  es2021: true
+plugins:
+  - "mocha"
+ignorePatterns:
+  - "**/test.js"
+extends: eslint:recommended
+parserOptions:
+  ecmaVersion: latest
+rules: {}

app_node/.eslintrc.yml

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+# Containerization Lab
+
+> In this .md file, I describe how I crafted the dockerfile, what best practices I used. How did I build and test an image. How did I push and pull an image, verifying and validating its functionality. 
+
+## Docker application ( `Quick Guide` )
+ 
+ > You can find my image on dockerhub, the link is clickable -  [my-node-app](https://hub.docker.com/layers/m4k4rich/my-node-app/dev/images/sha256:ae865650ef996ee89da47f6bda8182234f62f24a43d4210e96e0a2fd9db4af51)
+
+ 1. **How to build?** 
+ 
+     - Clone a repository.
+     - Change directory to app_python.
+     - Run ```docker build -t registry/name/tag .```
+
+ 2. **How to pull?**
+
+    - Login in your dockerhub account.
+    - Run ```docker pull m4k4rich/my-node-app/dev```
+
+ 3. **How to run?**
+
+    - Pull or build an image first.
+    - Run ```docker run -p PORT:8080 m4k4rich/my-node-app/dev``` instead of `PORT` specify which port you want to use**

app_node/DOCKER.md

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+# Use an official Node.js runtime as a parent image
+FROM node:14-alpine
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy all of the application files to the container
+COPY . /app
+
+# Create user and set ownership and permissions as required
+RUN adduser myuser -D && chown -R myuser /app 
+
+# Pick the running user
+USER myuser
+
+# Expose the port on which your Node.js app will run
+EXPOSE 3000
+
+# Start the Node.js application
+CMD ["node", "app.js"]

app_node/Dockerfile

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+# Node.js Web Application
+![Node-CI workflow](https://github.com/m4k4rich/core-course-labs/actions/workflows/node-ci.yml/badge.svg)
+
+> This is a Node.js application that showcases the current time in Moscow, adhering to best practices and coding standards. It has been thoroughly tested, ensuring that the time updates seamlessly upon page refresh.
+
+## Framework Selection
+
+**Node.js is an excellent choice for this task for the following reasons:**
+
+1. Efficiency and Speed:
+    - Node.js is known for its event-driven, non-blocking I/O architecture. This makes it highly efficient and responsive, ideal for delivering real-time updates like the current time.
+
+2. Ecosystem:
+   -  Node.js boasts a rich ecosystem of packages and libraries, enabling me to easily implement the required functionality without reinventing the wheel.
+
+## Adherence to Best Practices
+Code Consistency:
+ - I ensured that the codebase maintained a consistent style, adhering to the established best practices within the Node.js community.
+
+## Coding Standards
+
+> While Node.js doesn't enforce strict coding standards, there are some common conventions and best practices followed by developers when writing Node.js code.
+
+1. Use const and let: 
+   - In this script, const is used for variables that should not be reassigned (http, server, port), and let is used for variables (randomNumber) that may change their value.
+
+2. Arrow Functions: 
+   - The script uses arrow functions for defining the callback functions, such as (req, res) => {...} and () => {...}. Arrow functions are commonly used in Node.js for concise and clean syntax.

app_node/NODE.md

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+const http = require('http');
+
+const server = http.createServer((req, res) => {
+    // Generate a random number between 1 and 21
+    const randomNumber = Math.floor(Math.random() * 21) + 1;
+
+    // Set the response headers
+    res.writeHead(200, { 'Content-Type': 'text/plain' });
+
+    // Send the random number as the response
+    res.end(`Random Number: ${randomNumber}\n`);
+});
+
+const port = 3000;
+server.listen(port, () => {
+    console.log(`Server is running on http://localhost:${port}`);
+});