allow disabling public invitation requests through a setting

app/controllers/invitations_controller.rb

@@ -3,7 +3,12 @@ class InvitationsController < ApplicationController
    :except => [ :build, :create_by_request, :confirm_email ]

  def build
    @invitation_request = InvitationRequest.new
    if Rails.application.allow_invitation_requests?
      @invitation_request = InvitationRequest.new
    else
      flash[:error] = "Public invitation requests are not allowed."
      return redirect_to "/login"
    end
  end

  def index
@@ -19,7 +24,7 @@ def confirm_email
    ir.is_verified = true
    ir.save!

    flash[:success] = "Your invitiation request has been validated and " <<
    flash[:success] = "Your invitation request has been validated and " <<
      "will now be shown to other logged-in users."
    return redirect_to "/invitations/request"
  end
@@ -48,17 +53,21 @@ def create
  end

  def create_by_request
    @invitation_request = InvitationRequest.new(
      params.require(:invitation_request).permit(:name, :email, :memo))

    @invitation_request.ip_address = request.remote_ip

    if @invitation_request.save
      flash[:success] = "You have been e-mailed a confirmation to " <<
        params[:invitation_request][:email].to_s << "."
      return redirect_to "/invitations/request"
    if Rails.application.allow_invitation_requests?
      @invitation_request = InvitationRequest.new(
        params.require(:invitation_request).permit(:name, :email, :memo))

      @invitation_request.ip_address = request.remote_ip

      if @invitation_request.save
        flash[:success] = "You have been e-mailed a confirmation to " <<
          params[:invitation_request][:email].to_s << "."
        return redirect_to "/invitations/request"
      else
        render :action => :build
      end
    else
      render :action => :build
      return redirect_to "/login"
    end
  end

app/views/login/index.html.erb

@@ -26,8 +26,12 @@
    <p>
    Not a user yet?  Signup is by invitation only to combat spam and increase
    accountability.  If you know <a href="/u/">a current user</a> of the site,
    ask them for an invitation or <a href="/invitations/request">request one
    publicly</a>.
    ask them for an
    <% if Rails.application.allow_invitation_requests? %>
      invitation or <a href="/invitations/request">request one publicly</a>.
    <% else %>
      invitation.
    <% end %>
    </p>

    <% if @referer.present? %>

config/application.rb

@@ -42,6 +42,10 @@ class Application < Rails::Application
# define site name and domain to be used globally, can be overridden in
# config/initializers/production.rb
class << Rails.application
  def allow_invitation_requests?
    true
  end

  def domain
    "lobste.rs"
  end