app.py

from flask import Flask,send_from_directory, render_template, request,abort, flash, url_for, redirect
import werkzeug
from werkzeug.utils import secure_filename
from werkzeug.urls import urlencode
from werkzeug.exceptions import BadRequest
import os
app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = './uploads'
app.config['ALLOWED_EXTENSIONS'] = {'txt', 'pdf', 'png', 'jpg', 'jpeg'}
host= input('enter host with port: ex:127.0.0.1:5000 ') #host

def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in app.config['ALLOWED_EXTENSIONS']


@app.route("/")
def hello_world():
    return render_template('home.html')


@app.route('/upload', methods=['GET', 'POST'])
def upload_file():
    if request.method == 'POST':
        if 'file' not in request.files:
            flash('No file part', 'error')
            return redirect(request.url)
        file = request.files['file']
        if file.filename == '':
            flash('No selected file', 'error')
            return redirect(request.url)
        if file and allowed_file(file.filename):
            filename = secure_filename(file.filename)
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            return render_template('home.html',host=host,path=url_for('uploaded_file', filename=filename))
        else:
            flash('Invalid file type', 'error')
            return redirect(request.url)
    else:
        return render_template('home.html')


@app.route('/uploads/<filename>')
def uploaded_file(filename):
    if not os.path.exists(os.path.join(app.config['UPLOAD_FOLDER'], filename)):
        abort(404)
    if not os.path.isfile(os.path.join(app.config['UPLOAD_FOLDER'], filename)):
        abort(403)
    if not allowed_file(filename):
        abort(403)
    return send_from_directory(app.config['UPLOAD_FOLDER'], filename)

if __name__ == "__main__":
    app.secret_key = 'super secret key'
    app.config['SESSION_TYPE'] = 'filesystem'
    app.debug = True
    app.run()