berrypod/lib/berrypod_web/controllers/seo_controller.ex

defmodule BerrypodWeb.SeoController do
  use BerrypodWeb, :controller

  alias Berrypod.Products

  def robots(conn, _params) do
    base = BerrypodWeb.Endpoint.url()

    content = """
    User-agent: *
    Allow: /
    Disallow: /admin/
    Disallow: /api/
    Disallow: /users/
    Disallow: /webhooks/
    Disallow: /checkout/

    Sitemap: #{base}/sitemap.xml
    """

    conn
    |> put_resp_content_type("text/plain")
    |> send_resp(200, content)
  end

  def sitemap(conn, _params) do
    base = BerrypodWeb.Endpoint.url()
    products = Products.list_visible_products()
    categories = Products.list_categories()

    static_pages = [
      {"/", "daily", "1.0"},
      {"/collections/all", "daily", "0.9"},
      {"/about", "monthly", "0.5"},
      {"/contact", "monthly", "0.5"},
      {"/delivery", "monthly", "0.5"},
      {"/privacy", "monthly", "0.3"},
      {"/terms", "monthly", "0.3"}
    ]

    category_pages =
      Enum.map(categories, fn cat ->
        {"/collections/#{cat.slug}", "daily", "0.8"}
      end)

    product_pages =
      Enum.map(products, fn product ->
        {"/products/#{product.slug}", "weekly", "0.9"}
      end)

    all_pages = static_pages ++ category_pages ++ product_pages

    entries =
      Enum.map_join(all_pages, "\n", fn {path, changefreq, priority} ->
        "  <url>\n" <>
          "    <loc>#{base}#{path}</loc>\n" <>
          "    <changefreq>#{changefreq}</changefreq>\n" <>
          "    <priority>#{priority}</priority>\n" <>
          "  </url>"
      end)

    xml = """
    <?xml version="1.0" encoding="UTF-8"?>
    <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
    #{entries}
    </urlset>
    """

    conn
    |> put_resp_content_type("application/xml")
    |> send_resp(200, xml)
  end
end