Merge pull request #457 from phoenixframework/sd-before_closing_head_tag

SteffenDE · web-flow · commit 90ca0153ccba · 2024-11-11T11:10:13.000+01:00
Allow users to render content in the &lt;head&gt;
diff --git a/assets/js/app.js b/assets/js/app.js
@@ -21,7 +21,7 @@ let Hooks = {
 let socketPath = document.querySelector("html").getAttribute("phx-socket") || "/live"
 let csrfToken = document.querySelector("meta[name='csrf-token']").getAttribute("content")
 let liveSocket = new LiveView.LiveSocket(socketPath, Phoenix.Socket, {
-  hooks: Hooks,
+  hooks: { ...Hooks, ...window.LiveDashboard.customHooks },
   params: (liveViewName) => {
     return {
       _csrf_token: csrfToken,
diff --git a/dist/css/app.css b/dist/css/app.css
diff --git a/dist/js/app.js b/dist/js/app.js
diff --git a/dist/js/app.js.map b/dist/js/app.js.map
diff --git a/lib/phoenix/live_dashboard/layout_view.ex b/lib/phoenix/live_dashboard/layout_view.ex
@@ -37,4 +37,20 @@ defmodule Phoenix.LiveDashboard.LayoutView do
       )
     end
   end
+
+  defp custom_head_tags(assigns, key) do
+    case assigns do
+      %{^key => components} when is_list(components) ->
+        assigns = assign(assigns, :components, components)
+
+        ~H"""
+        <%= for component <- @components do %>
+          <%= component.(assigns) %>
+        <% end %>
+        """
+
+      _ ->
+        nil
+    end
+  end
 end
diff --git a/lib/phoenix/live_dashboard/layouts/dash.html.heex b/lib/phoenix/live_dashboard/layouts/dash.html.heex
@@ -1,13 +1,23 @@
 <!DOCTYPE html>
 <html lang="en" phx-socket={live_socket_path(@conn)}>
   <head>
+    <script nonce={csp_nonce(@conn, :script)}>
+      window.LiveDashboard = {
+        customHooks: {},
+        registerCustomHooks(hooks) {
+          this.customHooks = {...this.customHooks, ...hooks}
+        }
+      }
+    </script>
+    <%= custom_head_tags(assigns, :after_opening_head_tag) %>
     <meta charset="utf-8"/>
     <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
     <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, shrink-to-fit=no, user-scalable=no"/>
     <meta name="csrf-token" content={Phoenix.Controller.get_csrf_token()} />
     <title><%= assigns[:page_title] || "Phoenix LiveDashboard" %></title>
     <link rel="stylesheet" nonce={csp_nonce(@conn, :style)} href={asset_path(@conn, :css)}>
     <script nonce={csp_nonce(@conn, :script)} src={asset_path(@conn, :js)} defer></script>
+    <%= custom_head_tags(assigns, :before_closing_head_tag) %>
   </head>
   <body>
     <div class="d-flex flex-column align-items-stretch layout-wrapper">
diff --git a/lib/phoenix/live_dashboard/page_builder.ex b/lib/phoenix/live_dashboard/page_builder.ex
@@ -96,7 +96,7 @@ defmodule Phoenix.LiveDashboard.PageBuilder do
 
   We currently support `card/1`, `fields_card/1`, `row/1`,
   `shared_usage_card/1`, and `usage_card/1`;
-  and the live components `live_layered_graph/1`, `live_nav_bar/1`, 
+  and the live components `live_layered_graph/1`, `live_nav_bar/1`,
   and `live_table/1`.
 
   ## Helpers
@@ -105,6 +105,84 @@ defmodule Phoenix.LiveDashboard.PageBuilder do
   helpers are: `live_dashboard_path/2`, `live_dashboard_path/3`,
   `encode_app/1`, `encode_ets/1`, `encode_pid/1`, `encode_port/1`,
   and `encode_socket/1`.
+
+  ## Custom Hooks
+
+  If your page needs to register custom hooks, you can use the `register_after_opening_head_tag/2`
+  function. Because the hooks need to be available on the dead render in the layout, before the
+  LiveView's LiveSocket is configured, your need to do this inside an `on_mount` hook:
+
+  ```elixir
+  defmodule MyAppWeb.MyLiveDashboardHooks do
+    import Phoenix.LiveView
+    import Phoenix.Component
+
+    alias Phoenix.LiveDashboard.PageBuilder
+
+    def on_mount(:default, _params, _session, socket) do
+      {:cont, PageBuilder.register_after_opening_head_tag(socket, &after_opening_head_tag/1)}
+    end
+
+    defp after_opening_head_tag(assigns) do
+      ~H\"\"\"
+      <script nonce={@csp_nonces[:script]}>
+        window.LiveDashboard.registerCustomHooks({
+          MyHook: {
+            mounted() {
+              // do something
+            }
+          }
+        })
+      </script>
+      \"\"\"
+    end
+  end
+
+  defmodule MyAppWeb.MyCustomPage do
+    ...
+  end
+  ```
+
+  And then add it to the list of `on_mount` hooks in the `live_dashboard` router configuration:
+
+  ```elixir
+  live_dashboard "/dashboard",
+    additional_pages: [
+      route_name: MyAppWeb.MyCustomPage
+    ],
+    on_mount: [
+      MyAppWeb.MyLiveDashboardHooks
+    ]
+  ```
+
+  The LiveDashboard provides a function `window.LiveDashboard.registerCustomHooks({ ... })` that you can call
+  with an object of hook declarations.
+
+  Note that in order to use external libraries, you will either need to include them from
+  a CDN, or bundle them yourself and include them from your app's static paths.
+
+  > #### A note on CSPs and libraries {: .info}
+  >
+  > Phoenix LiveDashboard supports CSP nonces for its own assets, configurable using the
+  > `Phoenix.LiveDashboard.Router.live_dashboard/2` macro by setting the `:csp_nonce_assign_key`
+  > option. If you are building a library, ensure that you render those CSP nonces on any scripts,
+  > styles or images of your page. The nonces are passed to your custom page under the `:csp_nonces` assign
+  > and also available in  the `after_opening_head_tag` component.
+  >
+  > You should use those when including scripts or styles like this:
+  >
+  > ```heex
+  > <script nonce={@csp_nonces[:script]}>...</script>
+  > <script nonce={@csp_nonces[:script]} src="..."></script>
+  > <style nonce={@csp_nonces[:style]}>...</style>
+  > <link rel="stylesheet" href="..." nonce={@csp_nonces[:style]}>
+  > ```
+  >
+  > This ensures that your custom page can be used when a CSP is in place using the mechanism
+  > supported by Phoenix LiveDashboard.
+  >
+  > If your custom page needs a different CSP policy, for example due to inline styles set by scripts,
+  > please consider documenting these requirements.
   """
 
   use Phoenix.Component
@@ -971,6 +1049,30 @@ defmodule Phoenix.LiveDashboard.PageBuilder do
     live_dashboard_path(socket, route, node, old_params, new_params)
   end
 
+  @doc """
+  Registers a component to be rendered after the opening head tag in the layout.
+  """
+  def register_after_opening_head_tag(socket, component) do
+    register_head(socket, component, :after_opening_head_tag)
+  end
+
+  @doc """
+  Registers a component to be rendered before the closing head tag in the layout.
+  """
+  def register_before_closing_head_tag(socket, component) do
+    register_head(socket, component, :before_closing_head_tag)
+  end
+
+  defp register_head(socket, component, assign) do
+    case socket do
+      %{assigns: %{^assign => [_ | _]}} ->
+        update(socket, assign, fn existing -> [component | existing] end)
+
+      _ ->
+        assign(socket, assign, [component])
+    end
+  end
+
   # TODO: Remove this and the conditional on Phoenix v1.7+
   @compile {:no_warn_undefined, Phoenix.VerifiedRoutes}
 
diff --git a/mix.exs b/mix.exs
@@ -65,6 +65,7 @@ defmodule Phoenix.LiveDashboard.MixProject do
       {:stream_data, "~> 0.1", only: :test},
       {:ecto_sqlite3, "~> 0.9.1", only: [:dev, :test]},
       {:ex_doc, "~> 0.21", only: :docs},
+      {:makeup_eex, ">= 0.1.1", only: :docs},
       {:esbuild, "~> 0.5", only: :dev},
       {:dart_sass, "~> 0.7", only: :dev}
     ]
diff --git a/mix.lock b/mix.lock
@@ -22,9 +22,11 @@
   "file_system": {:hex, :file_system, "0.2.10", "fb082005a9cd1711c05b5248710f8826b02d7d1784e7c3451f9c1231d4fc162d", [:mix], [], "hexpm", "41195edbfb562a593726eda3b3e8b103a309b733ad25f3d642ba49696bf715dc"},
   "floki": {:hex, :floki, "0.36.2", "a7da0193538c93f937714a6704369711998a51a6164a222d710ebd54020aa7a3", [:mix], [], "hexpm", "a8766c0bc92f074e5cb36c4f9961982eda84c5d2b8e979ca67f5c268ec8ed580"},
   "jason": {:hex, :jason, "1.4.1", "af1504e35f629ddcdd6addb3513c3853991f694921b1b9368b0bd32beb9f1b63", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "fbb01ecdfd565b56261302f7e1fcc27c4fb8f32d56eab74db621fc154604a7a1"},
-  "makeup": {:hex, :makeup, "1.1.2", "9ba8837913bdf757787e71c1581c21f9d2455f4dd04cfca785c70bbfff1a76a3", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "cce1566b81fbcbd21eca8ffe808f33b221f9eee2cbc7a1706fc3da9ff18e6cac"},
-  "makeup_elixir": {:hex, :makeup_elixir, "0.16.2", "627e84b8e8bf22e60a2579dad15067c755531fea049ae26ef1020cad58fe9578", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "41193978704763f6bbe6cc2758b84909e62984c7752b3784bd3c218bb341706b"},
+  "makeup": {:hex, :makeup, "1.2.1", "e90ac1c65589ef354378def3ba19d401e739ee7ee06fb47f94c687016e3713d1", [:mix], [{:nimble_parsec, "~> 1.4", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "d36484867b0bae0fea568d10131197a4c2e47056a6fbe84922bf6ba71c8d17ce"},
+  "makeup_eex": {:hex, :makeup_eex, "1.0.0", "436d4c00204c250b17a775d64e197798aaf374627e6a4f2d3fd3074a8db61db4", [:mix], [{:makeup, "~> 1.2.1 or ~> 1.3", [hex: :makeup, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 1.0", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_html, "~> 0.1.0 or ~> 1.0", [hex: :makeup_html, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "3bb699bc519e4f509f1bf8a2e0ba0e08429edf3580053cd31a4f9c1bc5da86c8"},
+  "makeup_elixir": {:hex, :makeup_elixir, "1.0.0", "74bb8348c9b3a51d5c589bf5aebb0466a84b33274150e3b6ece1da45584afc82", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "49159b7d7d999e836bedaf09dcf35ca18b312230cf901b725a64f3f42e407983"},
   "makeup_erlang": {:hex, :makeup_erlang, "1.0.0", "6f0eff9c9c489f26b69b61440bf1b238d95badae49adac77973cbacae87e3c2e", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "ea7a9307de9d1548d2a72d299058d1fd2339e3d398560a0e46c27dab4891e4d2"},
+  "makeup_html": {:hex, :makeup_html, "0.1.2", "19d4050c0978a4f1618ffe43054c0049f91fe5feeb9ae8d845b5dc79c6008ae5", [:mix], [{:makeup, "~> 1.2", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "b7fb9afedd617d167e6644a0430e49c1279764bfd3153da716d4d2459b0998c5"},
   "mime": {:hex, :mime, "2.0.5", "dc34c8efd439abe6ae0343edbb8556f4d63f178594894720607772a041b04b02", [:mix], [], "hexpm", "da0d64a365c45bc9935cc5c8a7fc5e49a0e0f9932a761c55d6c52b142780a05c"},
   "myxql": {:hex, :myxql, "0.6.3", "3d77683a09f1227abb8b73d66b275262235c5cae68182f0cfa5897d72a03700e", [:mix], [{:db_connection, "~> 2.4.1 or ~> 2.5", [hex: :db_connection, repo: "hexpm", optional: false]}, {:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:geo, "~> 3.4", [hex: :geo, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:table, "~> 0.1.0", [hex: :table, repo: "hexpm", optional: true]}], "hexpm", "af9eb517ddaced5c5c28e8749015493757fd4413f2cfccea449c466d405d9f51"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.4.0", "51f9b613ea62cfa97b25ccc2c1b4216e81df970acd8e16e8d1bdc58fef21370d", [:mix], [], "hexpm", "9c565862810fb383e9838c1dd2d7d2c437b3d13b267414ba6af33e50d2d1cf28"},

Original file line number	Diff line number	Diff line change
`@@ -65,6 +65,7 @@ defmodule Phoenix.LiveDashboard.MixProject do`
`65`	`65`	`{:stream_data, "~> 0.1", only: :test},`
`66`	`66`	`{:ecto_sqlite3, "~> 0.9.1", only: [:dev, :test]},`
`67`	`67`	`{:ex_doc, "~> 0.21", only: :docs},`
	`68`	`+ {:makeup_eex, ">= 0.1.1", only: :docs},`
`68`	`69`	`{:esbuild, "~> 0.5", only: :dev},`
`69`	`70`	`{:dart_sass, "~> 0.7", only: :dev}`
`70`	`71`	`]`