Qr Factory

QR Factory

Generate QR codes for various data types with customizable appearance.

Requirements

• Python 3.8+
• pip install qrcode[pil] (qrcode + Pillow)

Instructions

1. Determine QR type and build payload:

   • URL: Raw URL string (e.g., https://example.com)
   • WiFi: WIFI:T:<WPA|WEP|nopass>;S:<SSID>;P:<password>;;
   • vCard: BEGIN:VCARD\nVERSION:3.0\nN:<last>;<first>\nTEL:<phone>\nEMAIL:<email>\nEND:VCARD
   • Email: mailto:user@example.com?subject=Hello&body=Hi
   • SMS: smsto:<number>:<message>
   • Text: Raw text string

2. Generate QR code:

   import qrcode
   qr = qrcode.QRCode(version=None, error_correction=qrcode.constants.ERROR_CORRECT_M, box_size=10, border=4)
   qr.add_data(payload)
   qr.make(fit=True)
   img = qr.make_image(fill_color="black", back_color="white")
   img.save(output_path)
   

3. Output: Save as PNG to /tmp/qr_<type>_<timestamp>.png or user-specified path. Return the file path.

Customization Options

• Size: Adjust box_size (default 10, range 5-20)
• Border: Adjust border (default 4, minimum 4 per spec)
• Colors: fill_color and back_color accept color names or hex codes
• Error correction: L (7%), M (15%), Q (25%), H (30%) — higher = more resilient but larger

Edge Cases

• Large data: QR version auto-scales (fit=True), but warn if data > 2KB (may not scan well).
• Special characters in WiFi: Escape ;, :, \, and , in SSID/password with backslash.
• Missing Pillow: If PIL import fails, run pip install Pillow and retry.
• Binary data: Not recommended for QR — suggest a URL link instead.

Security

• WiFi passwords: Warn user that QR codes containing passwords are readable by anyone who scans them.
• Sensitive data: Never generate QR codes containing API keys, tokens, or secrets unless explicitly requested.
• Sanitize file paths to prevent directory traversal.