fix: use local qr code generation to fix broken QR codes

server.py

@@ -1,4 +1,4 @@
-from flask import Flask, make_response, redirect, request, jsonify, render_template, send_from_directory
+from flask import Flask, make_response, redirect, request, jsonify, render_template, send_from_directory, send_file
 import os
 import dotenv
 import requests
@@ -8,6 +8,8 @@ import render
 import payments
 import threading
 import account
+import qrcode
+from io import BytesIO
 
 app = Flask(__name__)
 dotenv.load_dotenv()
@@ -304,7 +306,7 @@ def payment_post():
 
     finalPrice = payment['ID']
     HNSaddress = payment['HNSaddress']
-    qr = f"<img src='https://chart.googleapis.com/chart?chs=300x300&cht=qr&chl={HNSaddress}&choe=UTF-8' alt='QR Code' />"
+    qr = f"<img src='/qr/{HNSaddress}' style='width: 200px; height: 200px;'>"
 
     # Center the QR code
     qr = f"<div style='text-align: center;'>{qr}</div>"
@@ -313,6 +315,20 @@ def payment_post():
     responce.set_cookie('cart', '[]')
     return responce
 
+@app.route('/qr/<path:path>')
+def qr(path):
+    # Generate QR code
+    qr = qrcode.make(path)
+    
+    # Save the QR code to a bytes buffer
+    buffer = BytesIO()
+    qr.save(buffer, format='PNG')
+    buffer.seek(0)
+    
+    # Serve the image
+    return send_file(buffer, mimetype='image/png')
+    
+
 
 # Promo routes
 @app.route('/promo')