scinote-web/config/initializers/security_policy.rb

# Be sure to restart your server when you modify this file.

# Define an application-wide content security policy
# For further information see the following documentation
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy

Rails.application.config.content_security_policy do |policy|
  policy.default_src :self, :https
  policy.base_uri    :self
  policy.font_src    :self, :https, :data
  policy.img_src     :self, :https, :data
  policy.object_src  :none
  policy.script_src  :self, :https, :unsafe_eval
  policy.style_src   :self, :https, :unsafe_inline, :data
  policy.connect_src :self, :data, *Extends::EXTERNAL_SERVICES

  # Specify URI for violation reports
  # policy.report_uri "/csp-violation-report-endpoint"
end

# If you are using UJS then enable automatic nonce generation
Rails.application.config.content_security_policy_nonce_generator = ->_request { SecureRandom.base64(16) }

# Set the nonce only to specific directives
Rails.application.config.content_security_policy_nonce_directives = %w(script-src)

# Report CSP violations to a specified URI
# For further information see the following documentation:
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only
# Rails.application.config.content_security_policy_report_only = true

# Whitelist AWS buckets
Rails.application.configure do
  config.after_initialize do
    return unless ActiveStorage::Blob.service.name == :amazon

    Extends::EXTERNAL_SERVICES += [ActiveStorage::Blob.service.bucket.url]
    Rails.application.config.content_security_policy.connect_src :self, :data, *Extends::EXTERNAL_SERVICES
  end
end