Adding a New Feature to a Complex Python Application

• python

In this example, I’m a software engineer working on a Django-powered web store, and I’ve been tasked with adding a captcha for the registration page here. I don’t have much knowledge of Django or this project so I’ll use Navie to figure out how to add this feature.

👤 USER

What areas of my codebase are involved when a new user registers for my service. I want to find the files and functions involved when users register their account with my service so that I can add a simple offline captcha to the user registration form.

NAVIE

To add a simple offline captcha to the user registration form in your Django Oscar project, specifically for new user registration, let's identify the key areas and files involved in this process based on the provided AppMap configuration, statistics, sequence diagrams, and code snippets.

1. User Registration Flow:
From the sequence diagram and code snippets surrounding the POST request made to /en-gb/accounts/login/, the primary areas involved in the user registration process are:
• HTTP Server Requests handling the POST request.
• Interaction with views, specifically parts handling the registration form.
2. Main Files and Functions Involved:
views.py within src/oscar/apps/customer/ where the registration form is processed, especially:
• get_registration_form(self, bind_data=False) which retrieves the form for registration.
• validate_registration_form(self): Validates and processes the user registration form and, upon successful validation, registers the user.

# src/oscar/apps/customer/views.py
def validate_registration_form(self):
  form = self.get_registration_form(bind_data=True)
  if form.is_valid():
    self.register_user(form)

    msg = self.get_registration_success_message(form)
    messages.success(self.request, msg)

    return redirect(self.get_registration_success_url(form))

  ctx = self.get_context_data(registration_form=form)
  return self.render_to_response(ctx)

def get_registration_form(self, bind_data=False):
  return self.registration_form_class(
    **self.get_registration_form_kwargs(bind_data)
  )

forms.py within src/oscar/apps/customer/ where inputs are sanitized and validated:
• clean_email(self): Ensures no duplicate emails are used during registration.
• clean_password2(self): Validates that the password and confirmation match.
• clean_redirect_url(self): Cleans the URL to redirect after successful registration.
• save(self, commit=True): Saves the user, this is a crucial step where additional fields like Captcha can be validated.

# src/oscar/apps/customer/forms.py
def clean_email(self):
    # Email validation logic

def clean_password2(self):
    # Password match validation

def clean_redirect_url(self):
    # Redirect URL validation

def save(self, commit=True):
    user = super().save(commit=False)
    user.set_password(self.cleaned_data["password1"])
    # The captcha validation logic could be added either before saving or as part of form validation.

3. Adding Captcha to the User Registration Form:
To add an offline captcha, you will need to modify the form used for registration. This involves:
• Extending the Form: Add the Captcha field to the EmailUserCreationForm or whichever form your project uses for user creation in src/oscar/apps/customer/forms.py.
• Form Validation: Include validation logic for the captcha in the form's clean methods or specifically in a method like clean_captcha_field.
• Template Update: Ensure the registration template includes the captcha field. This will typically be in a Django template within src/oscar/apps/customer/templates/ directory.

4. Example of Adding a Captcha Field:
Modify the form in src/oscar/apps/customer/forms.py:

# src/oscar/apps/customer/forms.py
from somewhere import CaptchaField

class MyRegistrationForm(forms.Form):  # Your existing form class
    # Your existing fields
    captcha = CaptchaField()  # Add your captcha field here

Ensure you also append the logic to validate the captcha within form validation and save methods. Given these guidelines, you can implant the captcha at the correct procedural points in your user registration logic flow, enhancing the security of the registration process against automated submissions.

👤 USER

What is the name of the function in the src/oscar/apps/customer/forms.py that I would add the captcha into?

NAVIE

To integrate a simple offline CAPTCHA into your Django Oscar project specifically in the context of user registration, you should focus on modifying the form that handles user registration. Based on the information provided and the structure of Django Oscar, adding a CAPTCHA to the user registration process is ideally done within the forms related to user registration. Given the information you've shared and Django Oscar conventions, the EmailUserCreationForm appears to be the central form managing user registration in src/oscar/apps/customer/forms.py.

To add CAPTCHA functionality, follow these steps

1. Choose and Install a Django-compatible CAPTCHA Package: Django provides several packages like Django Simple Captcha or Django reCAPTCHA which can easily be integrated into Django forms. You need to pick one, add it to your requirements.txt, and install it with pip.
2. Update the Registration Form: In src/oscar/apps/customer/forms.py, find the class that handles the user registration. This might be EmailUserCreationForm or a similar form if the project has been customized. Add a new field for the CAPTCHA to this form class.

# src/oscar/apps/customer/forms.py
from some_captcha_package import CaptchaField

class EmailUserCreationForm(forms.ModelForm):
    # Existing fields here
    captcha = CaptchaField()
      

3. Override the Save Method (Optional): Depending on the CAPTCHA package used, you may need to override the save method of the form to incorporate CAPTCHA validation logic. However, most Django CAPTCHA packages handle validation automatically when the form's is_valid() method is called.
4. Update the Registration Form Template: You'll need to modify the user registration form template to include the CAPTCHA field. Find the template that renders the registration form (likely located under templates/oscar/customer/registration_form.html or a similar path) and add the following code where the CAPTCHA should be displayed:

{{ form.captcha }}

This code snippet renders the CAPTCHA widget on the registration page. These steps guide you through adding a simple offline CAPTCHA to the user registration form. Ensure that after making these changes, you run any necessary migrations and thoroughly test the registration process to verify the CAPTCHA functions as expected.

👤 USER

How would I use the django-simple-captcha library to add an offline captcha to my new user registration page

NAVIE

To add an offline captcha to the user registration page in your Django-based project, specifically using django-oscar, you can integrate the django-simple-captcha library by following these steps:

1. Install django-simple-captcha
First, ensure that you have `django-simple-captcha` installed. If it's not installed yet, you can do so by running:

pip install django-simple-captcha

2. Update INSTALLED_APPS
Add 'captcha' to your settings.py INSTALLED_APPS list. This will make the django-simple-captcha app available to your project.

INSTALLED_APPS = [
...
'captcha',
...
]

3. Modify EmailUserCreationForm
In the src/oscar/apps/customer/forms.py file, import the CaptchaField from django-simple-captcha and add a new captcha field to your EmailUserCreationForm.

# Add this import to the existing imports in forms.py
from captcha.fields import CaptchaField

class EmailUserCreationForm(forms.Form):
    ...
    # Add captcha field to the form
    captcha = CaptchaField()

4. Update Registration Template
Next, you need to update the registration template to include the captcha field. Since you already have access to the form in your template context, you can simply add the field using Django's templating language. In your registration template, locate the form where you want to add the captcha (it could be src/oscar/apps/customer/templates/oscar/customer/registration_form.html or a similar path in your project), and add the following line where you'd like the captcha to appear:

{% if form.captcha %} 
<p>
    {{ form.captcha.label_tag }}

    {{ form.captcha }}
</p>
{% endif %}

5. Form Submission
When your form is submitted, the captcha validation is automatically handled by the django-simple-captcha library as part of the form's clean/validation process. Ensure your view that processes the form submission is correctly calling form.is_valid() to perform this validation.
6. URL Configuration
Make sure your project's urls.py includes the captcha URLs to serve captcha images and audio:

urlpatterns = [
...
path('captcha/', include('captcha.urls')),
...
]

7. Run Migrations
Since django-simple-captcha uses database models to store captcha information, you need to create the necessary database tables:

python manage.py migrate captcha

This process integrates the captcha into your form, rendering it on the page, and validating it upon form submission. Since the captcha challenges are generated and validated server-side, it operates offline without needing external services, improving privacy and reducing external dependencies.

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