Add recaptcha and re-enable public signups

[danlamanna]

Summary by CodeRabbit

• New Features

  • Added reCAPTCHA verification to the signup form.
  • Signup attempts now display validation feedback when verification fails.
  • Successful verification allows account creation.

• Configuration

  • Production environments can use configured reCAPTCHA credentials.
  • Development and testing environments support reCAPTCHA test keys.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: c1dc37fb-111a-4c95-af0c-1851662e0ce2

📥 Commits

Reviewing files that changed from the base of the PR and between 8af9197 and f8214d8.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (8)

• isic/login/forms.py
• isic/login/templates/allauth/elements/fields.html
• isic/login/tests/test_signup.py
• isic/settings/base.py
• isic/settings/development.py
• isic/settings/production.py
• isic/settings/testing.py
• pyproject.toml

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📝 Walkthrough

Walkthrough

The signup flow now uses a reCAPTCHA checkbox. Django settings provide the dependency, form configuration, environment keys, and test-key checks. Signup tests cover rendering, rejected invalid verification, and successful account creation.

Changes

Signup protection

Layer / File(s)	Summary
reCAPTCHA dependency and settings pyproject.toml, isic/settings/base.py, isic/settings/development.py, isic/settings/production.py, isic/settings/testing.py	The project adds django-recaptcha, registers it, loads production keys from environment variables, and silences test-key checks in development and testing.
Signup form and widget rendering isic/login/forms.py, isic/login/templates/allauth/elements/fields.html, isic/settings/base.py	CaptchaSignupForm adds an ordered reCAPTCHA checkbox field. Allauth uses this form and renders the widget with validation errors.
Signup verification coverage isic/login/tests/test_signup.py	The signup test checks widget rendering, invalid verification rejection, and account creation after valid verification.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Mergeability Score: ⚪ Minimal · up to f8214

This change is merge-ready after normal checks and review; no actionable merge-blocking risk remains.

Sequence Diagram(s)

sequenceDiagram
  participant SignupPage
  participant CaptchaSignupForm
  participant django_recaptcha
  participant UserDatabase
  SignupPage->>CaptchaSignupForm: Submit signup fields and captcha
  CaptchaSignupForm->>django_recaptcha: Verify captcha response
  django_recaptcha-->>CaptchaSignupForm: Return verification result
  CaptchaSignupForm->>UserDatabase: Create account after valid verification

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Suggested reviewers: brianhelba

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main changes: adding reCAPTCHA and re-enabling public signups.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-recaptcha

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