From 46bf8705d66143377f685155e1efc73b8732e8f6 Mon Sep 17 00:00:00 2001
From: Christian Krakau-Louis <christianlouis@gmail.com>
Date: Thu, 27 Mar 2025 15:16:12 +0100
Subject: [PATCH] Add initial setup for Dockerized application

- Added GitHub Actions workflow for building Docker images (.github/workflows/docker-image.yml)
- Created Dockerfile for containerizing the application
- Implemented main application logic in app.py
- Added requirements.txt for managing Python dependencies
---
 .github/workflows/docker-image.yml | 26 ++++++++++++
 Dockerfile                         | 18 ++++++++
 app.py                             | 66 ++++++++++++++++++++++++++++++
 requirements.txt                   |  4 ++
 4 files changed, 114 insertions(+)
 create mode 100644 .github/workflows/docker-image.yml
 create mode 100644 Dockerfile
 create mode 100644 app.py
 create mode 100644 requirements.txt

diff --git a/.github/workflows/docker-image.yml b/.github/workflows/docker-image.yml
new file mode 100644
index 0000000..c831f92
--- /dev/null
+++ b/.github/workflows/docker-image.yml
@@ -0,0 +1,26 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v3
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: true
+          tags: your-dockerhub-username/random-pdf:latest
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..3ee0e50
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,18 @@
+# Use an official Python runtime as a parent image
+FROM python:3.9-slim
+
+# Create a working directory
+WORKDIR /app
+
+# Copy requirements and install
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the application code
+COPY app.py .
+
+# Expose the port Flask will run on (5000 by default)
+EXPOSE 5000
+
+# Run the app
+CMD ["python", "app.py"]
diff --git a/app.py b/app.py
new file mode 100644
index 0000000..d95dbca
--- /dev/null
+++ b/app.py
@@ -0,0 +1,66 @@
+import io
+import requests
+from flask import Flask, send_file, request
+from reportlab.pdfgen import canvas
+from reportlab.lib.pagesizes import A4
+from reportlab.lib.units import inch
+from faker import Faker
+
+app = Flask(__name__)
+
+# We can seed 'faker' with 'en_US' or 'de_DE' for random text generation
+fake_en = Faker('en_US')
+fake_de = Faker('de_DE')
+
+@app.route("/")
+def index():
+    return ("<h1>Random PDF Generator</h1>"
+            "<p>Try the <a href='/generate?lang=en'>/generate</a> endpoint "
+            "with a 'lang' query param (en or de) for random text.</p>")
+
+@app.route("/generate")
+def generate_pdf():
+    # Decide which language to use based on the query parameter; default to English
+    lang = request.args.get('lang', 'en').lower()
+    if lang == 'de':
+        text = fake_de.text()
+    else:
+        text = fake_en.text()
+
+    # Fetch a random image from picsum (you could also use Unsplash or other services)
+    image_url = "https://picsum.photos/600/400"
+    response = requests.get(image_url)
+    image_data = response.content  # raw bytes
+
+    # Create a PDF in memory
+    pdf_buffer = io.BytesIO()
+    pdf_canvas = canvas.Canvas(pdf_buffer, pagesize=A4)
+
+    # Add text
+    pdf_canvas.setFont("Helvetica", 12)
+    pdf_canvas.drawString(50, 780, "Random PDF Generator")
+    pdf_canvas.drawString(50, 760, f"Language: {lang}")
+    text_lines = text.split('\n')
+    y_position = 740
+    for line in text_lines:
+        pdf_canvas.drawString(50, y_position, line)
+        y_position -= 15
+
+    # Embed the image
+    # First, write the downloaded image to an in-memory buffer
+    # Note: For certain image formats, we might need to use PIL to decode properly,
+    # but if the response is a jpeg from picsum, this simple approach works.
+    img_buffer = io.BytesIO(image_data)
+    # let's place the image below the text
+    pdf_canvas.drawImage(img_buffer, 50, 400, width=4*inch, height=3*inch)
+
+    # finalize
+    pdf_canvas.showPage()
+    pdf_canvas.save()
+    pdf_buffer.seek(0)
+
+    # Return the PDF to the client
+    return send_file(pdf_buffer, as_attachment=True, download_name="random.pdf", mimetype='application/pdf')
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=5000, debug=True)
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..68a2ccb
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,4 @@
+Flask==2.2.5
+requests==2.31.0
+reportlab==3.6.12
+Faker==18.9.0