GRN2-180: First stages of refactoring code for v2.4 (#748)

* Email rescues and authenticator concern

* Application controller and helper clean up

* Moved controller code out of helpers

* More helper and email clean up

* Cleaned up remaining helpers and create omniauth_options

* Controller code clean up

* restructured views structure

* Restructured role code

* Restructured profile and code clean up

* Master merge

* Added bbb server concern to deal with bbb calls

* Bug fixes and changes after changes

* rspec

* More rubocop fixes

lib/omniauth_options.rb

@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+# BigBlueButton open source conferencing system - http://www.bigbluebutton.org/.
+#
+# Copyright (c) 2018 BigBlueButton Inc. and by respective authors (see below).
+#
+# This program is free software; you can redistribute it and/or modify it under the
+# terms of the GNU Lesser General Public License as published by the Free Software
+# Foundation; either version 3.0 of the License, or (at your option) any later
+# version.
+#
+# BigBlueButton is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
+
+module OmniauthOptions
+  module_function
+
+  def omniauth_options(env)
+    if env['omniauth.strategy'].options[:name] == "bn_launcher"
+      protocol = Rails.env.production? ? "https" : env["rack.url_scheme"]
+
+      customer_redirect_url = protocol + "://" + env["SERVER_NAME"] + ":" +
+                              env["SERVER_PORT"]
+      user_domain = parse_user_domain(env["SERVER_NAME"])
+      env['omniauth.strategy'].options[:customer] = user_domain
+      env['omniauth.strategy'].options[:customer_redirect_url] = customer_redirect_url
+      env['omniauth.strategy'].options[:default_callback_url] = Rails.configuration.gl_callback_url
+
+      # This is only used in the old launcher and should eventually be removed
+      env['omniauth.strategy'].options[:checksum] = generate_checksum(user_domain, customer_redirect_url,
+        Rails.configuration.launcher_secret)
+    elsif env['omniauth.strategy'].options[:name] == "google"
+      set_hd(env, ENV['GOOGLE_OAUTH2_HD'])
+    elsif env['omniauth.strategy'].options[:name] == "office365"
+      set_hd(env, ENV['OFFICE365_HD'])
+    end
+  end
+
+  # Limits the domain that can be used with the provider
+  def set_hd(env, hd)
+    if hd
+      hd_opts = hd.split(',')
+      env['omniauth.strategy'].options[:hd] = if hd_opts.empty?
+        nil
+      elsif hd_opts.length == 1
+        hd_opts[0]
+      else
+        hd_opts
+      end
+    end
+  end
+
+  # Parses the url for the user domain
+  def parse_user_domain(hostname)
+    return hostname.split('.').first if Rails.configuration.url_host.empty?
+    Rails.configuration.url_host.split(',').each do |url_host|
+      return hostname.chomp(url_host).chomp('.') if hostname.include?(url_host)
+    end
+    ''
+  end
+
+  # Generates a checksum to use alongside the omniauth request
+  def generate_checksum(user_domain, redirect_url, secret)
+    string = user_domain + redirect_url + secret
+    OpenSSL::Digest.digest('sha1', string).unpack1("H*")
+  end
+end