pyazo server side

server.py

from flask import Flask, request, redirect, url_for
import os
import random
import string
UPLOAD_FOLDER = '/var/www/html/uploads'
app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
ALLOWED_EXTENSIONS = set(['png', 'jpg', 'jpeg', 'gif'])
 
 
def id_generator(size=6, chars=string.ascii_letters + string.digits):
    return ''.join(random.choice(chars) for _ in range(size))
 
 
def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
 
 
@app.route('/', methods=['POST'])
def upload():
 
    if request.method == 'POST':
        if 'file' not in request.files:
            return 'No file'
        file = request.files['file']
        if file and allowed_file(file.filename):
            filename = id_generator()+'.png'
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            return filename