app.py

import gradio as gr
import urllib.request
import subprocess
import os
import glob


def extract_figure(url):
    # download PDF file from URL
    urllib.request.urlretrieve(url, "input.pdf")
    
    # extract first figure from PDF using pdffigures2
    subprocess.run(["java", "-jar", "pdffigures2.jar", "input.pdf", "-m", "figures_"])

    all_pngs = glob.glob("*.png")
    print(all_pngs)

    # get path to first figure
    figure_path = "figures_input-Figure1-1.png"
    
    # # read first figure from file
    # with open(figure_path, "rb") as f:
    #     figure_bytes = f.read()
    
    # # delete downloaded file and figure file
    # os.remove("input.pdf")
    # os.remove(figure_path)
    
    # return first figure
    return figure_path

# define input and output interfaces
inputs = gr.inputs.Textbox(label="Enter URL of PDF file:")
outputs = gr.outputs.Image(label="First figure in PDF:", type="filepath")

# create interface
interface = gr.Interface(fn=extract_figure, inputs=inputs, outputs=outputs, title="Extract First Figure from PDF", description="Enter the URL of a PDF file and the first figure in the file will be extracted and displayed.")

# launch interface
interface.launch()