The new Google ReCaptcha implementation for Flask without Flask-WTF.

Can also be used as standalone

pip install flask-recaptcha

from flask import Flask
from flask_recaptcha import ReCaptcha

app = Flask(__name__)
recaptcha = ReCaptcha(app=app)

#or 

recaptcha = Recaptcha()
recaptcha.init_app(app)

Inside of the form you want to protect, include the tag: {{ recaptcha }}

It will insert the code automatically If using Invisible reCAPTCHA

    {{ recaptcha(my-form, onSubmitCallback) }}

    [submit button]
</form>

If using reCAPTCHA ... your field ... your field

    {{ recaptcha() }}

    [submit button]
</form>

In the view that's going to validate the captcha

from flask import Flask
from flask_recaptcha import ReCaptcha

app = Flask(__name__)
recaptcha = ReCaptcha(app=app)

@route("/submit", methods=["POST"])
def submit():

    if recaptcha.verify():
        # SUCCESS
        pass
    else:
        # FAILED
        pass

reCaptcha.init(app, site_key, secret_key, is_enabled=True)

reCaptcha.get_code()

Returns the HTML code to implement. But you can use {{ recaptcha }} directly in your template

reCaptcha.verfiy()

Returns bool

Just include {{ recaptcha() }} wherever you want to show the recaptcha

Flask-ReCaptcha is configured through the standard Flask config API. These are the available options:

RECAPTCHA_ENABLED: Bool - True by default, when False it will bypass validation

RECAPTCHA_SITE_KEY : Public key

RECAPTCHA_SECRET_KEY: Private key

The following are Optional arguments.

RECAPTCHA_THEME: String - Theme can be 'light'(default) or 'dark'

RECAPTCHA_TYPE: String - Type of recaptcha can be 'image'(default) or 'audio'

RECAPTCHA_SIZE: String - Size of the image can be 'normal'(default) or 'compact'

RECAPTCHA_TABINDEX: Int - Tabindex of the widget can be used, if the page uses tabidex, to make navigation easier. Defaults to 0

RECAPTCHA_ENABLED = True
RECAPTCHA_SITE_KEY = ""
RECAPTCHA_SECRET_KEY = ""
RECAPTCHA_THEME = "dark"
RECAPTCHA_TYPE = "image"
RECAPTCHA_SIZE = "compact"
RECAPTCHA_RTABINDEX = 10

(c) 2015 Mardix