app.py

import gradio as gr
import qrcode
import qrcode.constants
from PIL import Image

def get_qr_image(data: str, fill_color: str = None, back_color: str = None):
    """
    Generate a QR code image from the given data and optional color parameters.
    
    Args:
        data (str): The data to encode in the QR code
        fill_color (str, optional): Color of the QR code modules (default: black)
        back_color (str, optional): Background color of the QR code (default: white)
    
    Returns:
        PIL.Image: Generated QR code image
    """
    qr = qrcode.QRCode(
        version=1,
        error_correction=qrcode.constants.ERROR_CORRECT_H,
        box_size=10,
        border=4,
    )
    
    qr.add_data(data)
    qr.make(fit=True)
    
    # Explicitly create a PIL Image and convert to RGB mode
    img = qr.make_image(fill_color=fill_color, back_color=back_color)
    img = img.convert('RGB')
    
    return img

def generate_qr(url, fill_color=None, back_color=None):
    """
    Wrapper function for Gradio interface to generate QR code.
    Handles potential errors and provides default behavior.
    
    Args:
        url (str): URL or data to encode
        fill_color (str, optional): Color of QR code modules
        back_color (str, optional): Background color of QR code
    
    Returns:
        PIL.Image: Generated QR code image
    """
    try:
        # Validate URL/data is not empty
        if not url:
            raise ValueError("URL or data cannot be empty")
        
        # Convert empty strings to None
        fill_color = fill_color.strip() if fill_color else 'black'
        back_color = back_color.strip() if back_color else 'white'
        
        # Generate QR code with optional color parameters
        return get_qr_image(url, fill_color, back_color)
    
    except Exception as e:
        # Error handling for Gradio
        gr.Warning(f"Error generating QR code: {str(e)}")
        return None

# Create Gradio interface
iface = gr.Interface(
    fn=generate_qr,
    inputs=[
        gr.Textbox(label="URL or Data"),
        gr.Textbox(label="Fill Color (optional)", placeholder="e.g., 'blue', '#FF0000'"),
        gr.Textbox(label="Background Color (optional)", placeholder="e.g., 'white', '#FFFFFF'")
    ],
    outputs=gr.Image(label="QR Code"),
    title="QR Code Generator",
    description="Generate a QR code from a URL or text with optional color customization."
)

# Launch the app
if __name__ == "__main__":
    iface.launch()