Refactor users_controller to use CanCanCan for authorisation

app/abilities/ability.rb

@@ -11,6 +11,7 @@ class Ability
          :search_geonames, :search_osm_nominatim_reverse, :search_geonames_reverse], :geocoder
     can [:index, :create, :comment, :feed, :show, :search, :mine], Note
     can [:index, :show], Redaction
+    can [:terms, :api_users, :login, :logout, :new, :create, :save, :confirm, :confirm_resend, :confirm_email, :lost_password, :reset_password, :show, :api_read, :auth_success, :auth_failure], User
     can [:index, :show, :blocks_on, :blocks_by], UserBlock
 
     if user
@@ -19,6 +20,7 @@ class Ability
       can [:create, :edit, :comment, :subscribe, :unsubscribe], DiaryEntry
       can [:close, :reopen], Note
       can [:new, :create], Report
+      can [:account, :go_public, :make_friend, :remove_friend, :api_details, :api_gpx_files], User
       can [:read, :read_one, :update, :update_one, :delete_one], UserPreference
 
       if user.moderator?
@@ -34,6 +36,7 @@ class Ability
         can [:hide, :hidecomment], [DiaryEntry, DiaryComment]
         can [:index, :show, :resolve, :ignore, :reopen], Issue
         can :create, IssueComment
+        can [:set_status, :delete, :index], User
         can [:grant, :revoke], UserRole
       end
     end

app/abilities/capability.rb

@@ -6,6 +6,8 @@ class Capability
   def initialize(token)
     can :create, ChangesetComment if capability?(token, :allow_write_api)
     can [:create, :comment, :close, :reopen], Note if capability?(token, :allow_write_notes)
+    can [:api_details], User if capability?(token, :allow_read_prefs)
+    can [:api_gpx_files], User if capability?(token, :allow_read_gpx)
     can [:read, :read_one], UserPreference if capability?(token, :allow_read_prefs)
     can [:update, :update_one, :delete_one], UserPreference if capability?(token, :allow_write_prefs)
 

app/controllers/users_controller.rb

@@ -6,15 +6,15 @@ class UsersController < ApplicationController
   before_action :authorize, :only => [:api_details, :api_gpx_files]
   before_action :authorize_web, :except => [:api_read, :api_users, :api_details, :api_gpx_files]
   before_action :set_locale, :except => [:api_read, :api_users, :api_details, :api_gpx_files]
-  before_action :require_user, :only => [:account, :go_public, :make_friend, :remove_friend]
+  before_action :api_deny_access_handler, :only => [:api_read, :api_users, :api_details, :api_gpx_files]
+
+  authorize_resource
+
   before_action :require_self, :only => [:account]
   before_action :check_database_readable, :except => [:login, :api_read, :api_users, :api_details, :api_gpx_files]
   before_action :check_database_writable, :only => [:new, :account, :confirm, :confirm_email, :lost_password, :reset_password, :go_public, :make_friend, :remove_friend]
   before_action :check_api_readable, :only => [:api_read, :api_users, :api_details, :api_gpx_files]
-  before_action :require_allow_read_prefs, :only => [:api_details]
-  before_action :require_allow_read_gpx, :only => [:api_gpx_files]
   before_action :require_cookies, :only => [:new, :login, :confirm]
-  before_action :require_administrator, :only => [:set_status, :delete, :index]
   around_action :api_call_handle_error, :only => [:api_read, :api_users, :api_details, :api_gpx_files]
   before_action :lookup_user_by_id, :only => [:api_read]
   before_action :lookup_user_by_name, :only => [:set_status, :delete]
@@ -749,23 +749,6 @@ class UsersController < ApplicationController
     end
   end
 
-  ##
-  # require that the user is a administrator, or fill out a helpful error message
-  # and return them to the user page.
-  def require_administrator
-    if current_user && !current_user.administrator?
-      flash[:error] = t("users.filter.not_an_administrator")
-
-      if params[:display_name]
-        redirect_to user_path(:display_name => params[:display_name])
-      else
-        redirect_to :action => "login", :referer => request.fullpath
-      end
-    elsif !current_user
-      redirect_to :action => "login", :referer => request.fullpath
-    end
-  end
-
   ##
   # require that the user in the URL is the logged in user
   def require_self

config/locales/en.yml

@@ -2175,8 +2175,6 @@ en:
       button: "Unfriend"
       success: "%{name} was removed from your friends."
       not_a_friend: "%{name} is not one of your friends."
-    filter:
-      not_an_administrator: "You need to be an administrator to perform that action."
     index:
       title: Users
       heading: Users

test/controllers/users_controller_test.rb

@@ -1469,7 +1469,7 @@ class UsersControllerTest < ActionController::TestCase
     # Now try as a normal user
     get :set_status, :params => { :display_name => user.display_name, :status => "suspended" }, :session => { :user => user }
     assert_response :redirect
-    assert_redirected_to :action => :show, :display_name => user.display_name
+    assert_redirected_to :controller => :errors, :action => :forbidden
 
     # Finally try as an administrator
     get :set_status, :params => { :display_name => user.display_name, :status => "suspended" }, :session => { :user => create(:administrator_user) }
@@ -1489,7 +1489,7 @@ class UsersControllerTest < ActionController::TestCase
     # Now try as a normal user
     get :delete, :params => { :display_name => user.display_name, :status => "suspended" }, :session => { :user => user }
     assert_response :redirect
-    assert_redirected_to :action => :show, :display_name => user.display_name
+    assert_redirected_to :controller => :errors, :action => :forbidden
 
     # Finally try as an administrator
     get :delete, :params => { :display_name => user.display_name, :status => "suspended" }, :session => { :user => create(:administrator_user) }
@@ -1531,14 +1531,14 @@ class UsersControllerTest < ActionController::TestCase
     # Shouldn't work when logged in as a normal user
     get :index
     assert_response :redirect
-    assert_redirected_to :action => :login, :referer => users_path
+    assert_redirected_to :controller => :errors, :action => :forbidden
 
     session[:user] = moderator_user.id
 
     # Shouldn't work when logged in as a moderator
     get :index
     assert_response :redirect
-    assert_redirected_to :action => :login, :referer => users_path
+    assert_redirected_to :controller => :errors, :action => :forbidden
 
     session[:user] = administrator_user.id
 
@@ -1598,8 +1598,8 @@ class UsersControllerTest < ActionController::TestCase
     assert_no_difference "User.active.count" do
       post :index, :params => { :confirm => 1, :user => { inactive_user.id => 1, suspended_user.id => 1 } }
     end
-    assert_response :redirect
+    assert_response :forbidden
-    assert_redirected_to :action => :login, :referer => users_path
+
     assert_equal "pending", inactive_user.reload.status
     assert_equal "suspended", suspended_user.reload.status
 
@@ -1610,7 +1610,7 @@ class UsersControllerTest < ActionController::TestCase
       post :index, :params => { :confirm => 1, :user => { inactive_user.id => 1, suspended_user.id => 1 } }
     end
     assert_response :redirect
-    assert_redirected_to :action => :login, :referer => users_path
+    assert_redirected_to :controller => :errors, :action => :forbidden
     assert_equal "pending", inactive_user.reload.status
     assert_equal "suspended", suspended_user.reload.status
 
@@ -1621,7 +1621,7 @@ class UsersControllerTest < ActionController::TestCase
       post :index, :params => { :confirm => 1, :user => { inactive_user.id => 1, suspended_user.id => 1 } }
     end
     assert_response :redirect
-    assert_redirected_to :action => :login, :referer => users_path
+    assert_redirected_to :controller => :errors, :action => :forbidden
     assert_equal "pending", inactive_user.reload.status
     assert_equal "suspended", suspended_user.reload.status
 
@@ -1645,8 +1645,8 @@ class UsersControllerTest < ActionController::TestCase
     assert_no_difference "User.active.count" do
       post :index, :params => { :hide => 1, :user => { normal_user.id => 1, confirmed_user.id => 1 } }
     end
-    assert_response :redirect
+    assert_response :forbidden
-    assert_redirected_to :action => :login, :referer => users_path
+
     assert_equal "active", normal_user.reload.status
     assert_equal "confirmed", confirmed_user.reload.status
 
@@ -1657,7 +1657,7 @@ class UsersControllerTest < ActionController::TestCase
       post :index, :params => { :hide => 1, :user => { normal_user.id => 1, confirmed_user.id => 1 } }
     end
     assert_response :redirect
-    assert_redirected_to :action => :login, :referer => users_path
+    assert_redirected_to :controller => :errors, :action => :forbidden
     assert_equal "active", normal_user.reload.status
     assert_equal "confirmed", confirmed_user.reload.status
 
@@ -1668,7 +1668,7 @@ class UsersControllerTest < ActionController::TestCase
       post :index, :params => { :hide => 1, :user => { normal_user.id => 1, confirmed_user.id => 1 } }
     end
     assert_response :redirect
-    assert_redirected_to :action => :login, :referer => users_path
+    assert_redirected_to :controller => :errors, :action => :forbidden
     assert_equal "active", normal_user.reload.status
     assert_equal "confirmed", confirmed_user.reload.status