Class: Userbin::Authentication

Inherits:
Object
  • Object
show all
Defined in:
lib/userbin/authentication.rb

Constant Summary collapse

CLOSING_HEAD_TAG = 
%r{</head>}
CLOSING_BODY_TAG = 
%r{</body>}

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}) ⇒ Authentication

Returns a new instance of Authentication.



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# File 'lib/userbin/authentication.rb', line 7

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

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/userbin/authentication.rb', line 11

def call(env)
  request = Rack::Request.new(env)

  begin
    if env["PATH_INFO"] == "/userbin" &&
       env["REQUEST_METHOD"] == "POST"
      signature, data = Userbin.authenticate_events!(request)

      MultiJson.decode(data)['events'].each do |event|
        Userbin::Events.trigger(event)
      end

      [ 200, { 'Content-Type' => 'text/html',
        'Content-Length' => '2' }, ['OK'] ]
    else
      signature, data = Userbin.authenticate!(request)

      if restrict && env["PATH_INFO"].start_with?(restrict) &&
         !Userbin.authenticated?
        return render_gateway(env["REQUEST_PATH"])
      end

      generate_response(env, signature, data)
    end
  rescue Userbin::SecurityError
    message =
      'Userbin::SecurityError: Invalid signature. Refresh to try again.'
    headers = {
      'Content-Type' => 'text/text',
      'Content-Length' => message.length.to_s
    }

    Rack::Utils.delete_cookie_header!(
      headers, '_ubs', value = {})
    Rack::Utils.delete_cookie_header!(
      headers, '_ubd', value = {})

    [ 400, headers, [message] ]
  end
end

#generate_response(env, signature, data) ⇒ Object 



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# File 'lib/userbin/authentication.rb', line 101

def generate_response(env, signature, data)
  status, headers, response = @app.call(env)
  if headers['Content-Type'] && headers['Content-Type']['text/html']
    if response.respond_to?(:body)
      body = [*response.body]
    else
      body = response
    end

    if Userbin.config.auto_include_tags
      body = body.each.map do |chunk|
        inject_tags(chunk)
      end
    end

    if response.respond_to?(:body)
      response.body = body
    else
      response = body
    end
  end

  if signature && data
    Rack::Utils.set_cookie_header!(
      headers, '_ubs', value: signature, path: '/')
    Rack::Utils.set_cookie_header!(
      headers, '_ubd', value: data, path: '/')
  else
    Rack::Utils.delete_cookie_header!(
      headers, '_ubs', value = {})
    Rack::Utils.delete_cookie_header!(
      headers, '_ubd', value = {})
  end

  [status, headers, response]
end

#inject_tags(body, login_path = restrict) ⇒ Object 



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# File 'lib/userbin/authentication.rb', line 91

def inject_tags(body,  = restrict)
  if body[CLOSING_HEAD_TAG]
    body = body.gsub(CLOSING_HEAD_TAG, link_tags() + '\\0')
  end
  if body[CLOSING_BODY_TAG]
    body = body.gsub(CLOSING_BODY_TAG, script_tag + '\\0')
  end
  body
end

#link_tags(login_path) ⇒ Object 



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# File 'lib/userbin/authentication.rb', line 56

def link_tags()
  <<-LINK_TAGS
<link rel="userbin:root" href="/" />
<link rel="userbin:login" href="#{}" />
  LINK_TAGS
end

#render_gateway(current_path) ⇒ Object 



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# File 'lib/userbin/authentication.rb', line 72

def render_gateway(current_path)
   = <<-LOGIN_PAGE
<html>
<head>
  <title>Log in</title>
</head>
<body>
  <a class="ub-login-form"></a>
</body>
</html>
  LOGIN_PAGE
   = inject_tags(, current_path)
  [ 403,
    { 'Content-Type' => 'text/html',
      'Content-Length' => .length.to_s },
    []
  ]
end

#restrict ⇒ Object 



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# File 'lib/userbin/authentication.rb', line 52

def restrict
  Userbin.config.restricted_path
end

#script_tag ⇒ Object 



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# File 'lib/userbin/authentication.rb', line 63

def script_tag
  script_url = ENV.fetch('USERBIN_SCRIPT_URL') {
    "//js.userbin.com"
  }
  str = <<-SCRIPT_TAG
<script src="#{script_url}?#{Userbin.config.app_id}"></script>
  SCRIPT_TAG
end