Add consumable invites (#5814)

* Add consumable invites

* Add UI for generating invite codes

* Add tests

* Display max uses and expiration in invites table, delete invite

* Remove unused column and redundant validator

- Default follows not used, probably bad idea
- InviteCodeValidator is redundant because RegistrationsController
  checks invite code validity

* Add admin setting to disable invites

* Add admin UI for invites, configurable role for invite creation

- Admin UI that lists everyone's invites, always available
- Admin setting min_invite_role to control who can invite people
- Non-admin invite UI only visible if users are allowed to

* Do not remove invites from database, expire them instantly

1 files changed, 43 insertions, 0 deletions

diff --git a/app/controllers/invites_controller.rb b/app/controllers/invites_controller.rb
new file mode 100644
index 000000000..38d6c8d73
--- /dev/null
+++ b/app/controllers/invites_controller.rb
@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+class InvitesController < ApplicationController
+  include Authorization
+
+  layout 'admin'
+
+  before_action :authenticate_user!
+
+  def index
+    authorize :invite, :create?
+
+    @invites = Invite.where(user: current_user)
+    @invite  = Invite.new(expires_in: 1.day.to_i)
+  end
+
+  def create
+    authorize :invite, :create?
+
+    @invite      = Invite.new(resource_params)
+    @invite.user = current_user
+
+    if @invite.save
+      redirect_to invites_path
+    else
+      @invites = Invite.where(user: current_user)
+      render :index
+    end
+  end
+
+  def destroy
+    @invite = Invite.where(user: current_user).find(params[:id])
+    authorize @invite, :destroy?
+    @invite.expire!
+    redirect_to invites_path
+  end
+
+  private
+
+  def resource_params
+    params.require(:invite).permit(:max_uses, :expires_in)
+  end
+end