quick-qrcode-generator/app/qrwebform.py

#!/usr/bin/python3

from flask import Flask, render_template, flash, request
from flask_wtf import FlaskForm
from wtforms import Form, BooleanField, SubmitField, TextField
from wtforms.validators import DataRequired
import os

DEBUG = False
app = Flask(__name__)
app.config.from_object(__name__)
app.config['SECRET_KEY'] = os.urandom(40)

class QRForm(FlaskForm):
    user_data = TextField("Dane:", validators=[DataRequired()])
    # setting default here doesn't work, so we cannot retain checkbox state over POST
    # we force trim_spaced to be checked in the template
    # see https://github.com/wtforms/flask-wtf/issues/489 https://github.com/wtforms/flask-wtf/issues/362
    # https://github.com/wtforms/flask-wtf/issues/464
    trim_spaces = BooleanField("Usuń spacje")
    submit = SubmitField("Generuj")

    @app.route("/", methods=["GET", "POST"])
    def main():
        form = QRForm(request.form)

        if request.method == "POST":
            data = request.form["user_data"]
            if "trim_spaces" in request.form and request.form["trim_spaces"] == "y":
                data = data.replace(" ", "")
        else:
            # not POST? get back to ourselves
            data = request.url_root

        return render_template("main.html", form=form, data=data, genurl="/render/")

if __name__ == "__main__":
    app.run(host='::')