import os
from flask import Flask, jsonify, request, make_response
from flask_cors import CORS
from werkzeug.utils import secure_filename

UPLOAD_FOLDER='/images'
ALLOWED_EXTENSIONS = set(['png', 'jpg', 'jpeg', 'gif'])

app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
CORS(app)


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

@app.route('/', methods=['GET', 'POST'])
def upload_file():

    print(request.files)
    if request.method == "POST":
        # check if the post request has the file part
        if 'file' not in request.files:
            print('No file part')
            return make_response("No File Part", 400)
        file = request.files["file"]
        # if user does not select file, browser also submit an empty part
        # without filename
        if file.filename == '':
            print('No selected file')
            return make_response("No Selected File", 400)
        if file and allowed_file(file.filename):
            filename = secure_filename(file.filename) # filenames can be dangerous!
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            return make_response("Success", 201)

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