From 079a24bcae09a4fdff077d9a48b9e163c48a847f Mon Sep 17 00:00:00 2001
From: Robert Prehn <prehnra@gmail.com>
Date: Fri, 17 Sep 2021 13:20:44 -0500
Subject: [PATCH] feat: Add social media and SEO tags to head

---
 apps/app/assets/package-lock.json             |  2 +-
 .../app_web/templates/layout/_social.html.eex | 28 +++++++++++
 .../app_web/templates/layout/root.html.leex   |  2 +-
 apps/app/lib/app_web/views/layout_view.ex     | 46 ++++++++++++++++---
 .../test/app_web/views/layout_view_test.exs   | 38 +++++++++++++++
 5 files changed, 107 insertions(+), 9 deletions(-)
 create mode 100644 apps/app/lib/app_web/templates/layout/_social.html.eex

diff --git a/apps/app/assets/package-lock.json b/apps/app/assets/package-lock.json
index 6c6beedd..7321b8a7 100644
--- a/apps/app/assets/package-lock.json
+++ b/apps/app/assets/package-lock.json
@@ -11238,7 +11238,7 @@
       }
     },
     "../../../deps/phoenix_live_view": {
-      "version": "0.16.0",
+      "version": "0.16.3",
       "license": "MIT"
     },
     "node_modules/stylehacks": {
diff --git a/apps/app/lib/app_web/templates/layout/_social.html.eex b/apps/app/lib/app_web/templates/layout/_social.html.eex
new file mode 100644
index 00000000..6f3cbb5c
--- /dev/null
+++ b/apps/app/lib/app_web/templates/layout/_social.html.eex
@@ -0,0 +1,28 @@
+<%= live_title_tag title(@view_module, @view_template, assigns) %>
+
+<%= tag :meta, itemprop: "name", content: title(@view_module, @view_template, assigns) %>
+<%= tag :meta, itemprop: "description", content: excerpt(@view_module, @view_template, assigns) %>
+<%= tag :meta, name: "description", content: excerpt(@view_module, @view_template, assigns) %>
+
+<!-- Twitter Card -->
+<%= tag :meta, name: "twitter:card", content: "summary_large_image" %>
+<%= tag :meta, name: "twitter:title", content: title(@view_module, @view_template, assigns) %>
+<%= tag :meta, name: "twitter:description", content: excerpt(@view_module, @view_template, assigns) %>
+<!-- <meta name="twitter:site" content="@site_handle"> -->
+<!-- <meta name="twitter:creator" content="@author_handle"> -->
+
+<!-- Facebook / Open Graph -->
+<%= tag :meta, property: "og:title", content: title(@view_module, @view_template, assigns) %>
+<%= tag :meta, property: "og:type", content: "article" %>
+<%= tag :meta, property: "og:description", content: excerpt(@view_module, @view_template, assigns) %>
+<%= tag :meta, property: "og:site_name", content: Legendary.I18n.t!("en", "site.title") %>
+<%= modified_tag(@view_module, @view_template, assigns) %>
+<%= published_tag(@view_module, @view_template, assigns) %>
+<!-- <meta property="article:section" content="Article Section" /> -->
+<!-- <meta property="article:tag" content="Article Tag" /> -->
+<!-- <meta property="fb:admins" content="Facebook numberic ID" /> -->
+
+<!-- Preview Images -->
+<!-- <meta itemprop="image" content="http://www.example.com/image.jpg"> -->
+<!-- <meta name="twitter:image:src" content="http://www.example.com/image.jpg"> -->
+<!-- <meta property="og:image" content="http://example.com/image.jpg" /> -->
diff --git a/apps/app/lib/app_web/templates/layout/root.html.leex b/apps/app/lib/app_web/templates/layout/root.html.leex
index d5b583bf..bbcd96a3 100644
--- a/apps/app/lib/app_web/templates/layout/root.html.leex
+++ b/apps/app/lib/app_web/templates/layout/root.html.leex
@@ -5,7 +5,7 @@
     <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
     <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
     <%= csrf_meta_tag() %>
-    <%= live_title_tag title(@view_module, @view_template, assigns) %>
+    <%= render "_social.html", assigns %>
     <link phx-track-static rel="stylesheet" href="<%= Routes.static_path(@conn, "/css/app.css") %>"/>
     <script defer phx-track-static type="text/javascript" src="<%= Routes.static_path(@conn, "/js/app.js") %>"></script>
   </head>
diff --git a/apps/app/lib/app_web/views/layout_view.ex b/apps/app/lib/app_web/views/layout_view.ex
index 27d26082..26a6668a 100644
--- a/apps/app/lib/app_web/views/layout_view.ex
+++ b/apps/app/lib/app_web/views/layout_view.ex
@@ -1,15 +1,47 @@
 defmodule AppWeb.LayoutView do
   use AppWeb, :view
 
+  def title(view, template, %{post: post}), do: "#{post.title} | #{title(view, template, nil)}"
+
   def title(_, _, _) do
     Legendary.I18n.t!("en", "site.title")
-   end
+  end
 
-   def excerpt(_, _, _) do
-     Legendary.I18n.t!("en", "site.excerpt")
-   end
+  def excerpt(_, _, %{post: post}) do
+    post.excerpt
+  end
 
-   def feed_tag(_, _, _, _) do
-     nil
-   end
+  def excerpt(_, _, _) do
+    Legendary.I18n.t!("en", "site.excerpt")
+  end
+
+  def feed_tag(_, _, _, _) do
+    nil
+  end
+
+  def modified_tag(_, _, %{post: post}) do
+    content =
+      post.modified_gmt
+      |> DateTime.from_naive!("Etc/UTC")
+      |> DateTime.to_iso8601()
+
+    tag :meta, property: "article:modified_time", content: content
+  end
+
+  def modified_tag(_, _, _) do
+    nil
+  end
+
+  def published_tag(_, _, %{post: post}) do
+    content =
+      post.date_gmt
+      |> DateTime.from_naive!("Etc/UTC")
+      |> DateTime.to_iso8601()
+
+    tag :meta, property: "article:published_time", content: content
+  end
+
+  def published_tag(_, _, _) do
+    nil
+  end
 end
diff --git a/apps/app/test/app_web/views/layout_view_test.exs b/apps/app/test/app_web/views/layout_view_test.exs
index 65687848..ca03e06b 100644
--- a/apps/app/test/app_web/views/layout_view_test.exs
+++ b/apps/app/test/app_web/views/layout_view_test.exs
@@ -2,6 +2,16 @@ defmodule App.LayoutViewTest do
   use AppWeb.ConnCase, async: true
 
   import AppWeb.LayoutView
+  import Phoenix.HTML, only: [safe_to_string: 1]
+
+  alias Legendary.Content.Post
+
+  @post %Post{
+    title: "Test Post",
+    excerpt: "This is a test post.",
+    modified_gmt: ~N[2021-09-17T00:00:00],
+    date_gmt: ~N[2021-09-15T00:00:00]
+  }
 
   describe "title/3" do
     def default_title do
@@ -11,6 +21,10 @@ defmodule App.LayoutViewTest do
     test "for nil" do
       assert title(nil, nil, nil) =~ default_title()
     end
+
+    test "for post" do
+      assert title(nil, nil, %{post: @post}) =~ "Test Post | #{default_title()}"
+    end
   end
 
   describe "excerpt/3" do
@@ -21,6 +35,10 @@ defmodule App.LayoutViewTest do
     test "for nil" do
       assert excerpt(nil, nil, nil) =~ default_excerpt()
     end
+
+    test "for post" do
+      assert excerpt(nil, nil, %{post: @post}) =~ "This is a test post."
+    end
   end
 
   describe "feed_tag/4" do
@@ -28,4 +46,24 @@ defmodule App.LayoutViewTest do
       assert feed_tag(nil, nil, nil, nil) == nil
     end
   end
+
+  describe "modified_tag/3" do
+    test "for a post" do
+      assert safe_to_string(modified_tag(nil, nil, %{post: @post})) =~ "2021-09-17"
+    end
+
+    test "without a post" do
+      assert modified_tag(nil, nil, nil) == nil
+    end
+  end
+
+  describe "published_tag/3" do
+    test "for a post" do
+      assert safe_to_string(published_tag(nil, nil, %{post: @post})) =~ "2021-09-15"
+    end
+
+    test "without a post" do
+      assert published_tag(nil, nil, nil) == nil
+    end
+  end
 end