Class: ActionDispatch::ContentSecurityPolicy::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/action_dispatch/http/content_security_policy.rb

Constant Summary collapse

CONTENT_TYPE = 
"Content-Type"
POLICY = 
"Content-Security-Policy"
POLICY_REPORT_ONLY = 
"Content-Security-Policy-Report-Only"

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/action_dispatch/http/content_security_policy.rb', line 33

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/action_dispatch/http/content_security_policy.rb', line 37

def call(env)
  request = ActionDispatch::Request.new env
  status, headers, _ = response = @app.call(env)

  # Returning CSP headers with a 304 Not Modified is harmful, since nonces in the new
  # CSP headers might not match nonces in the cached HTML.
  return response if status == 304

  return response if policy_present?(headers)

  if policy = request.content_security_policy
    nonce = request.content_security_policy_nonce
    nonce_directives = request.content_security_policy_nonce_directives
    context = request.controller_instance || request
    headers[header_name(request)] = policy.build(context, nonce, nonce_directives)
  end

  response
end