example upload Flask server

upload-server.py

import os
from flask import Flask, flash, request, redirect, url_for, render_template, send_from_directory
from werkzeug import secure_filename


UPLOAD_FOLDER = 'uploads'
ALLOWED_EXTENSIONS = set(['webm', 'mp4', 'mp3', 'wav', 'jpeg', 'gif', 'png'])
static_folder = os.path.abspath(os.path.dirname(__file__))
template_dir = os.path.join(static_folder, 'examples')

app = Flask(__name__, template_folder=template_dir)
app.secret_key = 'super secret key'
# limit size for uploaded files to 16 MB max
app.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER


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


# Custom static data
@app.route('/node_modules/<path:filename>')
def node_modules(filename):
    return send_from_directory(os.path.join(static_folder, 'node_modules'), filename)

@app.route('/dist/<path:filename>')
def dist(filename):
    return send_from_directory(os.path.join(static_folder, 'dist'), filename)


@app.route('/upload', methods=['GET', 'POST'])
def upload_file():
    print('saving uploaded file..')
    if request.method == 'POST':
        # check if the post request has the file part
        if 'file' not in request.files:
            flash('No file part')
            return redirect(request.url)
        file = request.files['file']


        print('filename: {}'.format(file.filename))

        # if user does not select file, browser also
        # submits an empty part without filename
        if file.filename == '':
            flash('No selected file')
            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))
            print('saved uploaded file.')
            return redirect(url_for('uploaded_file',
                                    filename=filename))
    return render_template('upload/simple.html')


@app.route('/uploads/<filename>')
def uploaded_file(filename):
    return send_from_directory(app.config['UPLOAD_FOLDER'], filename)


if __name__ == '__main__':
    app.run(debug=True)