[Referral] Add support for redirecting to a custom URL

app/controllers/admin_controller.rb

@@ -1407,7 +1407,7 @@ def referral_programs
   end
 
   def referral_program_create
-    @referral_program = Referral::Program.new(name: params[:name], creator: current_user)
+    @referral_program = Referral::Program.new(name: params[:name], redirect_to: params[:redirect_to], creator: current_user)
 
     if @referral_program.save
       flash[:success] = "Referral program created successfully."

app/controllers/referral/links_controller.rb

@@ -21,7 +21,7 @@ def show
         skip_authorization
       end
 
-      redirect_to params[:return_to] || root_path
+      redirect_to @link.program.redirect_to.presence || root_path, allow_other_host: true
     end
 
     private

app/models/referral/program.rb

@@ -10,6 +10,7 @@
 #  login_header_text    :string
 #  login_text_color     :string
 #  name                 :string           not null
+#  redirect_to          :string
 #  created_at           :datetime         not null
 #  updated_at           :datetime         not null
 #  creator_id           :bigint

app/views/admin/referral_programs.html.erb

@@ -8,6 +8,7 @@
           <div class="flex flex-col">
             <h5 class="m-0 p-0"><%= program.name %></h5>
             <small class="text-muted"><%= program.created_at.strftime("%Y-%m-%d") %> • Created by <%= program.creator.name %></small>
+            <small class="text-muted">Redirects to: <%= link_to(program.redirect_to.presence || root_url, program.redirect_to.presence || root_url) %></small>
           </div>
           <div class="flex flex-row gap-2 justify-between m-0">
             <span class="m-0"><%= pluralize(program.users.size, "user") %> • <%= pluralize(program.new_users.size, "new user") %></span>
@@ -65,7 +66,8 @@
     <legend>Create a referral program</legend>
     <%= form.label :name, "Program name" %>
     <%= form.text_field :name, placeholder: "Program Name", required: true, class: "w-100" %>
-    <br>
+    <%= form.label :redirect_to, "Redirect to (optional)" %>
+    <%= form.text_field :redirect_to, placeholder: "https://hcb.hackclub.com/", class: "w-100" %>
     <%= form.submit "Create", class: "btn bg-success" %>
   </fieldset>
 <% end %>

db/migrate/20251207022849_add_redirect_to_to_referral_programs.rb

@@ -0,0 +1,5 @@
+class AddRedirectToToReferralPrograms < ActiveRecord::Migration[8.0]
+  def change
+    add_column :referral_programs, :redirect_to, :string
+  end
+end

db/schema.rb

@@ -12,7 +12,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_12_05_035167) do
+ActiveRecord::Schema[8.0].define(version: 2025_12_07_022849) do
   create_schema "google_sheets"
 
   # These are extensions that must be enabled in order to support this database
@@ -2010,6 +2010,7 @@
     t.string "login_header_text"
     t.string "login_text_color"
     t.string "name", null: false
+    t.string "redirect_to"
     t.datetime "updated_at", null: false
     t.index ["creator_id"], name: "index_referral_programs_on_creator_id"
   end