Set og:description meta tag to diary entry description

app/controllers/diary_entries_controller.rb

@@ -70,7 +70,8 @@ class DiaryEntriesController < ApplicationController
       @title = t ".title", :user => params[:display_name], :title => @entry.title
       @opengraph_properties = {
         "og:image" => @entry.body.image,
-        "og:image:alt" => @entry.body.image_alt
+        "og:image:alt" => @entry.body.image_alt,
+        "og:description" => @entry.body.description
       }
       @comments = can?(:unhide, DiaryComment) ? @entry.comments : @entry.visible_comments
     else

app/helpers/open_graph_helper.rb

@@ -7,7 +7,7 @@ module OpenGraphHelper
       "og:title" => title || t("layouts.project_name.title"),
       "og:type" => "website",
       "og:url" => url_for(:only_path => false),
-      "og:description" => t("layouts.intro_text")
+      "og:description" => properties["og:description"] || t("layouts.intro_text")
     }.merge(
       opengraph_image_properties(properties)
     )

test/controllers/diary_entries_controller_test.rb

@@ -744,6 +744,28 @@ class DiaryEntriesControllerTest < ActionDispatch::IntegrationTest
     assert_dom "head meta[property='og:image:alt']", :count => 0
   end
 
+  def test_show_no_og_description
+    user = create(:user)
+    diary_entry = create(:diary_entry, :user => user, :body => "![nope](https://example.com/nope.jpg)")
+
+    get diary_entry_path(user, diary_entry)
+    assert_response :success
+    assert_dom "head meta[property='og:description']" do
+      assert_dom "> @content", I18n.t("layouts.intro_text")
+    end
+  end
+
+  def test_show_og_description
+    user = create(:user)
+    diary_entry = create(:diary_entry, :user => user, :body => "# Hello\n\n![hello](https://example.com/hello.jpg)\n\nFirst paragraph.\n\nSecond paragraph.")
+
+    get diary_entry_path(user, diary_entry)
+    assert_response :success
+    assert_dom "head meta[property='og:description']" do
+      assert_dom "> @content", "First paragraph."
+    end
+  end
+
   def test_hide
     user = create(:user)
     diary_entry = create(:diary_entry, :user => user)