name: kirby-forms-and-frontend-actions description: Implements frontend forms and actions in Kirby (contact forms, file uploads, email with attachments, creating pages from frontend). Use when handling user input or building submission flows.

Kirby Forms and Frontend Actions

KB entry points

• kirby://kb/scenarios/39-basic-contact-form
• kirby://kb/scenarios/40-frontend-file-uploads
• kirby://kb/scenarios/41-email-with-attachments
• kirby://kb/scenarios/42-creating-pages-from-frontend
• kirby://kb/scenarios/43-user-registration-and-login

Required inputs

• Form fields and validation rules.
• Spam protection choice and error handling expectations.
• Storage target and email settings.
• Upload constraints (MIME/size) if files are involved.

Default controller flow

• Verify CSRF and require the expected POST fields.
• Validate and normalize input; return errors early.
• Apply a single spam guard (default: honeypot).
• Persist data or send email, then redirect with a success state.

Error payload shape

return [
  'errors' => ['email' => 'Invalid email'],
  'old' => $data,
];

Upload storage convention

• Store files under a dedicated page (e.g. page('uploads')) or the current page.
• Normalize filenames and enforce MIME/size limits before saving.

Common pitfalls

• Missing CSRF verification on POST handlers.
• Accepting uploads without MIME or size checks.

Workflow

1. Clarify the form type, validation rules, spam protection, storage target, and email requirements.
2. Call kirby:kirby_init and read kirby://roots.
3. Inspect existing templates/controllers/snippets for patterns:
   • kirby:kirby_templates_index
   • kirby:kirby_controllers_index
   • kirby:kirby_snippets_index
4. Read relevant config options via kirby://config/{option} (e.g. email, routes) when needed.
5. Search the KB with kirby:kirby_search (examples: "basic contact form", "frontend file uploads", "email with attachments", "creating pages from frontend").
6. Implement controller-driven validation and CSRF checks; keep templates thin and escape output.
7. For uploads, enforce MIME/size limits and store files in safe locations.
8. Verify by submitting forms in a browser and rendering success/error states with kirby:kirby_render_page.