virtualfridge/main.py

from flask import (
    Flask, request, render_template, send_file,
    redirect, url_for
)

import os

app = Flask(__name__)
app.debug = True

@app.route('/')
def index():
    return render_template('index.html')

def imgpath(p):
    return os.path.join('imgs/', p)

@app.route('/img')
def imgs():
    files = [
        f for f in os.listdir('imgs/')
        if os.path.isfile(imgpath(f))
    ]
    ordered = sorted(
        files, key=lambda f: os.stat(imgpath(f)).st_mtime,
        reverse=True
    )
    return '\n'.join([
        f'<img src="img/{f}" style="width: 100%"/>'
        for f in ordered
    ])

@app.route('/img/<path:path>')
def img(path):
    return send_file(os.path.join('imgs/', path))

@app.route('/upload', methods=['POST'])
def upload():
    file = request.files['file']
    file.save(os.path.join('imgs/', file.filename))
    return redirect(url_for('imgs'))

app.run()