app.py

from flask import Flask, render_template, request, redirect
import youtube_dl



app = Flask(__name__)

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

@app.route('/how-to')
def how_to():
	return render_template('how-to.html')

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

@app.route('/terms-conditions')
def terms():
	return render_template('terms-conditions.html')

@app.route('/download', methods=["POST", "GET"])
def download():
	try:
		url = request.form["url"]
		with youtube_dl.YoutubeDL() as ydl:

			url = ydl.extract_info(url, download=False)

			try:
				download_link = url["entries"][-1]["formats"][-1]["url"]
			except:
				download_link = url["formats"][-1]["url"]

			if ".mp4" in download_link:
				return redirect(download_link)
			else:
				return redirect(download_link+"&dl=1")
	except:
		return render_template('error.html')

if __name__ == '__main__':
	# Use this for local testing
	# app.run(port=80, debug=False)
	
	app.run(debug=False, host='0.0.0.0')