Add force_login option to OAuth authorize page (#8655)

* Add force_login option to OAuth authorize page

For when a user needs to sign into an app from multiple accounts
on the same server

* When logging out from modal header, redirect back after re-login

app/controllers/api/base_controller.rb

@@ -53,10 +53,6 @@ class Api::BaseController < ApplicationController
     [params[:limit].to_i.abs, default_limit * 2].min
   end
 
-  def truthy_param?(key)
-    ActiveModel::Type::Boolean.new.cast(params[key])
-  end
-
   def current_resource_owner
     @current_user ||= User.find(doorkeeper_token.resource_owner_id) if doorkeeper_token
   end

app/controllers/application_controller.rb

@@ -58,6 +58,10 @@ class ApplicationController < ActionController::Base
 
   protected
 
+  def truthy_param?(key)
+    ActiveModel::Type::Boolean.new.cast(params[key])
+  end
+
   def forbidden
     respond_with_error(403)
   end

app/controllers/auth/sessions_controller.rb

@@ -28,8 +28,10 @@ class Auth::SessionsController < Devise::SessionsController
   end
 
   def destroy
+    tmp_stored_location = stored_location_for(:user)
     super
     flash.delete(:notice)
+    store_location_for(:user, tmp_stored_location) if continue_after?
   end
 
   protected
@@ -124,8 +126,14 @@ class Auth::SessionsController < Devise::SessionsController
   end
 
   def clear_site_data
+    return if continue_after?
+
     # Should be '"*"' but that doen't work in Chrome (neither does '"executionContexts"')
     # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Clear-Site-Data
     response.headers['Clear-Site-Data'] = '"cache", "cookies", "storage"'
   end
+
+  def continue_after?
+    truthy_param?(:continue)
+  end
 end

app/controllers/oauth/authorizations_controller.rb

@@ -13,4 +13,18 @@ class Oauth::AuthorizationsController < Doorkeeper::AuthorizationsController
   def store_current_location
     store_location_for(:user, request.url)
   end
+
+  def render_success
+    if skip_authorization? || (matching_token? && !truthy_param?('force_login'))
+      redirect_or_render authorize_response
+    elsif Doorkeeper.configuration.api_only
+      render json: pre_auth
+    else
+      render :new
+    end
+  end
+
+  def truthy_param?(key)
+    ActiveModel::Type::Boolean.new.cast(params[key])
+  end
 end