rules:
- id: avoid-html-safe
  message: >-
    'html_safe' renders raw HTML. This means that normal
    HTML escaping is bypassed. If user data can be controlled here, this
    exposes your application to cross-site scripting (XSS). If you need to
    do this, be sure to correctly sanitize the data using a library such as
    DOMPurify.
  metadata:
    references:
    - https://stackoverflow.com/questions/4251284/raw-vs-html-safe-vs-h-to-unescape-html#:~:text===
    - https://medium.com/sumone-technical-blog/a-pretty-way-to-unescape-html-in-a-ruby-on-rails-application-efc22b850027
    category: security
    technology:
    - rails
  languages: [generic]
  paths:
    include:
    - '*.erb'
  severity: WARNING
  patterns:
  - pattern-inside: <%= ... %>
  - pattern: $SOMETHING.html_safe