flask captcha2

Flask plugin to integrate Google-captcha (version 2, 3) and local captcha (image, voice) with Flask applications

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0.0 how to install:

pip install -U flask_captcha2 

0.1 how to use:

from flask import Flask
from flask_captcha2 import FlaskCaptcha

app = Flask(__name__)


 google_captcha2_config_list = {
     "CAPTCHA_PRIVATE_KEY": "hish !",
     "CAPTCHA_PUBLIC_KEY": "hish !",
     'CAPTCHA_ENABLED': True,  # captcha status <True, False> 
     "CAPTCHA_LOG": True, # show captcha logs in console
     "CAPTCHA_LANGUAGE": "en" # captcha language
 }

 google_captcha3_config_list = {
     "CAPTCHA_PRIVATE_KEY": "hish !",
     "CAPTCHA_PUBLIC_KEY": "hish !",
     'CAPTCHA_ENABLED': True,  # captcha status <True, False> 
     "CAPTCHA_SCORE": 0.5,  #google captcha version3 works with scores
     "CAPTCHA_LOG": True  # show captcha requests and logs in terminal > stdout
 }

 MainCaptcha = FlaskCaptcha(app=app)  # app is required
 # passing config list directly
 google_captcha2 = MainCaptcha.get_google_captcha_v2(name='g-captcha2', conf=google_captcha2_config_list)
 google_captcha3 = MainCaptcha.get_google_captcha_v3(name='g-captcha3', conf=google_captcha3_config_list)
 # Namespaces are important. Do not use repeated names and choose names with meaning.

google captcha docs https://developers.google.com/recaptcha/docs/v3

example:

# you can also pass nothing and it will be uses app.config for filling configs
 app.config.update(google_captcha3_config_list) # set configs in app.config
 MainCaptcha = FlaskCaptcha(app=app)
 # No need to send conf_list, it will be set automatically from app.config
 google_captcha2 = MainCaptcha.get_google_captcha_v2(name='g-captcha2')

0.2 how use in templates for rendering Captcha Widget:

Use < captcha.render_captcha > Filter to render a captcha in html

-> Remember namespaces argument in crating a captcha object

google_captcha2 = MainCaptcha.get_google_captcha_v2(name='g-captcha2') # name
google_captcha3 = MainCaptcha.get_google_captcha_v3(name='g-captcha3') # name

for rendering a captcha width you should pass name to < model_name > in < captcha.render_captcha >

rendering Google Version 2 Captcha:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Captcha version 2</title>
</head>
<body>

 <form method="POST" action="some-url">
     <input placeholder="username" type="text" name="username" id="">
     <br>
     <input placeholder="password" type="password" name="password" id="">
     <br>
     <input value="submit" type="submit">

     {# 
        all available parameter for google captcha version 2:
            model_name: required,
            id: optional,
            css_class: optional,
            inline_css: optional,
            js_event: optional,
            dataset: optional,
     #}
    
     
     {{
     captcha.render_captcha (
            # [Required] namespace
             model_name='g-captcha2', 
                
            # [Optional] add id to captcha widget
             id='g-captcha-v2',
                 
            # [Optional] add css class to captcha widget
            css_class='p-2 btn btn-primary',
            
            # [Optional] add inline css to captcha widget
            inline_css='font-size:10px;', 
            
            # [Optional] add dataset to captcha widget
            dataset="data-checked='true';"
            
            # [Optional] add js event to captcha widget
            js_event="onclick(alert('clicked!'))", 
        )
     }}

 </form>
</body>
</html>

Google captcha version 2 render parameters

rendering Google Version 3 Captcha :

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Captcha version 3</title>
</head>
<body>

 <form method="POST" action="/v3" id="ParentForm"> # <---- parent_form_id 

{# you can also use Flask-wtf forms #}
 <input placeholder="username" type="text" name="username" id="">
 <br>
 <input placeholder="password" type="password" name="password" id="">
 <br>
 {{
     captcha.render_captcha (
     # [Required] Namespace
     model_name='g-captcha3'

     # [Optional] add id to captcha widget
     id="SubmitBtnForm"

     # [Optional] add custom css class to captcha widget
     css_class='custom-class-name'

     # [Optional] inline css of captcha widget
     inline_css="background-color:blue; color:white; font-size:2rem;"

     # [Optional] add dataset to captcha widget
     dataset="data-ok='true' data-test='test data set check' "

     # [Required] if of parent form
     parent_form_id="ParentForm"

     # [Required] text content of the submit button
     button_text="submit This Form"

     # [Optional] javascript event of captcha widget
     js_event="onclick='alert('this is inline event');' "

     # [Optional] set visibility of captcha widget in bottom right corner,
     # this parameter doesn't disable captcha, its only hidden the captcha in
     # the page, but captcha still works
     hide_badge=True
     )
 }}
 </form>
</body>
</html>

Google captcha version 3 render parameters

0.3 How to verify Captcha:

Use the is_verify method on captcha objects for validating a request that contains a captcha

@app.route("/g-v2-verify/", methods=["POST"])
def index():
    # with is_verify method verify the captcha 
    if google_captcha2.is_verify():
        return "Captcha is ok."
    else:
        return "Try again!"

@app.route("/g-v3-verify/", methods=["POST"])
def index():
    # with the is_verify method verify the captcha
    if google_captcha3.is_verify():
        return "Captcha is ok."
    else:
        return "Try again!"

Version History:

• version 2.0.0 Released: May 18, 2023

• Changes: - None

• version 2.0.1 Released: June 9, 2023

• Changes:

  • Change FlaskCaptcha Class to FlaskCaptcha2
  • Fix bug in rendering captcha widget when captcha-enable was False

• version 3.0.0 Released: September 9, 2023

• Changes:

  • Change package structure
  • Add Captcha version 3 and fix some bugs in Captcha version 2

• version 3.0.4 Released: October 27, 2023

• Changes:

  • reformat/Refactor project structure
  • adding FlaskCaptcha Master class
  • adding getFlaskCaptcha3 method for getting google-captcha version 3
  • adding getFlaskCaptcha2 method for getting google-captcha version 2
  • adding namespacing for each captcha
  • adding the ability to create multiple captchas with different versions
  • adding pytest base test

• version 3.0.5 Released: July 21, 2024

• Changes:

  • reformat/Refactor code
  • rename render_captcha parameters

• version 3.1.0 Released: September 28, 2024

• Changes:

  • reformat/Refactor code
  • Refactoring all method and function signatures to adhere to PEP8 input parameter naming conventions.
  • minor changes.