app.py

#from pathlib import Path
import gradio as gr
import os

def upload_file(filepath):
    """
    Handle uploaded file and generate its accessible URL. Function constructs a public-facing URL using the `SPACE_HOST` environment variable. 
    
    Args:
        filepath: A list of file paths uploaded through the Gradio `File` component.

    Returns:
        file_url: An accessible constructed URL pointing to the uploaded file. Use this for downstream processes.
    """    
    print("----- inside upload file -----")
    print(f"filepath -- {filepath}")
    
    # Get the space URL (if hosted on HF Spaces)
    space_url = os.getenv("SPACE_HOST", "")  # HF Spaces sets this
    if space_url:
        file_url = f"{space_url}/gradio_api/file={filepath[0]}"
        print(f"File URL: {file_url}")
    
    return file_url #filepath[0]

with gr.Blocks() as demo:
    gr.Markdown("## Using gr.File")
    with gr.Row():
        f_in = gr.File(label="Upload a file", file_count="multiple")
        #f_out = gr.File(label="Output file", file_count="multiple")
    file_url = gr.Textbox(label="file_url")

    f_in.upload(upload_file, f_in, file_url, api_name="output_file_url")

demo.launch(debug=True, mcp_server=True)