Redirect to a default path if HTTP_REFERER is not set

Safari 9.0 does not yet honor the HTML5 `origin-when-cross-origin` mode,
and it's possible load balancers/proxies strip the HTTP_REFERER from
the request header. In these cases, default to some default path.

Closes #3122

Closes https://github.com/gitlabhq/gitlabhq/issues/9731

3 files changed, 19 insertions, 11 deletions

diff --git a/app/controllers/admin/broadcast_messages_controller.rb b/app/controllers/admin/broadcast_messages_controller.rb
index 0808024fc39..497c34f8f49 100644
--- a/app/controllers/admin/broadcast_messages_controller.rb
+++ b/app/controllers/admin/broadcast_messages_controller.rb
@@ -19,7 +19,7 @@ class Admin::BroadcastMessagesController < Admin::ApplicationController
     BroadcastMessage.find(params[:id]).destroy
 
     respond_to do |format|
-      format.html { redirect_to :back }
+      format.html { redirect_back_or_default(default: { action: 'index' }) }
       format.js { render nothing: true }
     end
   end
diff --git a/app/controllers/admin/hooks_controller.rb b/app/controllers/admin/hooks_controller.rb
index d670386f8c6..0bd19c49d8f 100644
--- a/app/controllers/admin/hooks_controller.rb
+++ b/app/controllers/admin/hooks_controller.rb
@@ -35,7 +35,7 @@ class Admin::HooksController < Admin::ApplicationController
     }
     @hook.execute(data, 'system_hooks')
 
-    redirect_to :back
+    redirect_back_or_default
   end
 
   def hook_params
diff --git a/app/controllers/admin/users_controller.rb b/app/controllers/admin/users_controller.rb
index 00f41a10dd1..c63d0793e31 100644
--- a/app/controllers/admin/users_controller.rb
+++ b/app/controllers/admin/users_controller.rb
@@ -33,33 +33,33 @@ class Admin::UsersController < Admin::ApplicationController
 
   def block
     if user.block
-      redirect_to :back, notice: "Successfully blocked"
+      redirect_back_or_admin_user(notice: "Successfully blocked")
     else
-      redirect_to :back, alert: "Error occurred. User was not blocked"
+      redirect_back_or_admin_user(alert: "Error occurred. User was not blocked")
     end
   end
 
   def unblock
     if user.activate
-      redirect_to :back, notice: "Successfully unblocked"
+      redirect_back_or_admin_user(notice: "Successfully unblocked")
     else
-      redirect_to :back, alert: "Error occurred. User was not unblocked"
+      redirect_back_or_admin_user(alert: "Error occurred. User was not unblocked")
     end
   end
 
   def unlock
     if user.unlock_access!
-      redirect_to :back, alert: "Successfully unlocked"
+      redirect_back_or_admin_user(alert: "Successfully unlocked")
     else
-      redirect_to :back, alert: "Error occurred. User was not unlocked"
+      redirect_back_or_admin_user(alert: "Error occurred. User was not unlocked")
     end
   end
 
   def confirm
     if user.confirm
-      redirect_to :back, notice: "Successfully confirmed"
+      redirect_back_or_admin_user(notice: "Successfully confirmed")
     else
-      redirect_to :back, alert: "Error occurred. User was not confirmed"
+      redirect_back_or_admin_user(alert: "Error occurred. User was not confirmed")
     end
   end
 
@@ -138,7 +138,7 @@ class Admin::UsersController < Admin::ApplicationController
     user.update_secondary_emails!
 
     respond_to do |format|
-      format.html { redirect_to :back, notice: "Successfully removed email." }
+      format.html { redirect_back_or_admin_user(notice: "Successfully removed email.") }
       format.js { render nothing: true }
     end
   end
@@ -157,4 +157,12 @@ class Admin::UsersController < Admin::ApplicationController
       :projects_limit, :can_create_group, :admin, :key_id
     )
   end
+
+  def redirect_back_or_admin_user(options = {})
+    redirect_back_or_default(default: default_route, options: options)
+  end
+
+  def default_route
+    [:admin, @user]
+  end
 end