Class: Middleware::GtmScriptNonceInjector

Inherits:
Object
  • Object
show all
Defined in:
lib/middleware/gtm_script_nonce_injector.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, settings = {}) ⇒ GtmScriptNonceInjector

Returns a new instance of GtmScriptNonceInjector.



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# File 'lib/middleware/gtm_script_nonce_injector.rb', line 5

def initialize(app, settings = {})
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/middleware/gtm_script_nonce_injector.rb', line 9

def call(env)
  status, headers, response = @app.call(env)

  if nonce_placeholder = headers.delete("Discourse-GTM-Nonce-Placeholder")
    nonce = SecureRandom.hex
    parts = []
    response.each { |part| parts << part.to_s.sub(nonce_placeholder, nonce) }
    %w[Content-Security-Policy Content-Security-Policy-Report-Only].each do |name|
      next if headers[name].blank?
      headers[name] = headers[name].sub("script-src ", "script-src 'nonce-#{nonce}' ")
    end
    [status, headers, parts]
  else
    [status, headers, response]
  end
end