app.py

import subprocess
import os

 # Use container’s home directory to avoid permission errors
WORKDIR = os.path.join(os.environ['HOME'], "workspace")
os.makedirs(WORKDIR, exist_ok=True)

 # HTML iframe to embed noVNC viewer
NO_VNC_IFRAME = """
<iframe src="http://localhost:6080/vnc.html?autoconnect=true&resize=remote"
        style="width:100%; height:600px; border:none;">
</iframe>
"""

 def start_desktop():

    return NO_VNC_IFRAME

 def run_shell(cmd):

    result = subprocess.run(
        cmd,
        shell=True,
        capture_output=True,
        text=True,
        env={**os.environ, "DISPLAY": ":1"}  # Supports GUI apps if needed
    )
    return result.stdout + result.stderr

 def upload_file(file):
    dest_path = os.path.join(WORKDIR, os.path.basename(file.name))
    with open(dest_path, "wb") as f:

        f.write(file.read())
    return f"✅ Uploaded to: {dest_path}"

 with gr.Blocks(css="@import url('https://cdn.simplecss.org/simple.min.css');") as demo:
    gr.Markdown("# 🖥️ Offline Visual Sandbox (no API, no cost)")

     with gr.Tab("Desktop"):
        launch_btn = gr.Button("Launch Desktop")
        desktop_view = gr.HTML()
        launch_btn.click(start_desktop, outputs=desktop_view)

     with gr.Tab("Shell"):
        cmd_input = gr.Textbox(label="Shell Command", placeholder="Try 'ls /home/user/workspace'")
        run_btn = gr.Button("Run")
        cmd_output = gr.Textbox(label="Command Output", lines=10)
        run_btn.click(run_shell, inputs=cmd_input, outputs=cmd_output)

     with gr.Tab("Upload"):
        file_input = gr.File(label="Upload File")
        status_output = gr.Textbox(label="Upload Status")
        file_input.change(upload_file, inputs=file_input, outputs=status_output)

     demo.launch(
        server_name="0.0.0.0",