QR Code Generator Microservice Studio

# QR-Code-GEN.py — Instant QR Code Generator
# Puzzle me this #31 Challenge Implementation

import qrcode

# Follows clue: use qrcode.make() and .save()
img = qrcode.make('jointherealworld.com')
img.save('trw.png')

# Output matches exact challenge recording:
print("Success. QR Code created")

from io import BytesIO
from fastapi import FastAPI, Query, Response
import qrcode

app = FastAPI(title="QR Code Generator Microservice")

@app.get("/qr", response_class=Response)
def generate_qr(
    url: str = Query(..., description="Target link"),
    box_size: int = 10,
    border: int = 4
):
    # In-memory streaming without disk persistence
    img = qrcode.make(url, box_size=box_size, border=border)
    buf = BytesIO()
    img.save(buf, format="PNG")
    
    return Response(
        content=buf.getvalue(),
        media_type="image/png",
        headers={"Cache-Control": "public, max-age=86400"}
    )

# 1. Direct GET streaming to PNG file
curl -s "http://127.0.0.1:8000/qr?url=jointherealworld.com&box_size=10&border=4" -o trw.png

# 2. JSON POST API with base64 data response
curl -X POST "http://127.0.0.1:8000/api/generate" \
     -H "Content-Type: application/json" \
     -d '{"url":"https://jointherealworld.com","box_size":10,"border":4,"as_base64":true}'

// Fetch binary PNG from microservice and render in browser
async function fetchQRCode(targetUrl) {
  const endpoint = `http://127.0.0.1:8000/qr?url=${encodeURIComponent(targetUrl)}`;
  const response = await fetch(endpoint);
  const blob = await response.blob();
  const imageUrl = URL.createObjectURL(blob);
  
  const imgElement = document.createElement('img');
  imgElement.src = imageUrl;
  document.body.appendChild(imgElement);
}

{
  "nodes": [
    {
      "name": "Generate QR Code",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "url": "http://localhost:8000/qr",
        "method": "GET",
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            { "name": "url", "value": "={{ $json.targetUrl }}" },
            { "name": "box_size", "value": "10" },
            { "name": "border", "value": "4" }
          ]
        },
        "responseFormat": "file"
      }
    }
  ]
}