Flask-WTF

@(python)[ch3]

How recaptcha works!

• View handler

from flask import Flask, render_template, flash, session, redirect, url_for
from wtforms import TextAreaField
from wtforms.validators import DataRequired
from flask_wtf import FlaskForm
from flask_wtf.recaptcha import RecaptchaField


DEBUG = True
SECRET_KEY = 'secret'

# keys for localhost. Change as appropriate.

RECAPTCHA_PUBLIC_KEY = '6LeYIbsSAAAAACRPIllxA7wvXjIE411PfdB2gt2J'
RECAPTCHA_PRIVATE_KEY = '6LeYIbsSAAAAAJezaIq3Ft_hSTo0YtyeFG-JgRtu'

app = Flask(__name__)
app.config.from_object(__name__)


class CommentForm(FlaskForm):

    comment = TextAreaField("Comment", validators=[DataRequired()])
    recaptcha = RecaptchaField()


@app.route("/")
def index(form=None):
    if form is None:
        form = CommentForm()
    comments = session.get("comments", [])
    return render_template("index_recaptch.html",
                           comments=comments,
                           form=form)


@app.route("/add/", methods=("POST",))
def add_comment():

    form = CommentForm()
    if form.validate_on_submit():
        comments = session.pop('comments', [])
        comments.append(form.comment.data)
        session['comments'] = comments
        flash("You have added a new comment")
        return redirect(url_for("index"))
    return index(form)


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

• Template

    
        {% for comment in comments %}
        
{{ comment }}
        {% endfor %}
        

            {{ form.csrf_token }}
            

                {{ form.comment.label }}

                {{ form.comment(rows=4, cols=40) }}
            
            

                {% for error in form.recaptcha.errors %}
                    {{ error }}
                {% endfor %}
                {{ form.recaptcha }}