Add schema.org markup to SEO-enabled posts (#36075)

app/serializers/seo/social_media_posting_serializer.rb

@@ -0,0 +1,127 @@
+# frozen_string_literal: true
+
+class SEO::SocialMediaPostingSerializer < ActiveModel::Serializer
+  include FormattingHelper
+  include RoutingHelper
+
+  attributes :context, :type, :url, :date_published, :date_modified,
+             :author, :text, :interaction_statistic
+
+  attribute :image, if: -> { object.ordered_media_attachments.any?(&:image?) }
+  attribute :video, if: -> { object.ordered_media_attachments.any? { |attachment| attachment.video? || attachment.gifv? } }
+  attribute :audio, if: -> { object.ordered_media_attachments.any?(&:audio?) }
+  attribute :shared_content, if: -> { object.with_preview_card? }
+
+  def context
+    'https://schema.org'
+  end
+
+  def type
+    'SocialMediaPosting'
+  end
+
+  def url
+    ActivityPub::TagManager.instance.url_for(object)
+  end
+
+  def date_published
+    object.created_at.iso8601
+  end
+
+  def date_modified
+    object.edited_at&.iso8601
+  end
+
+  def author
+    {
+      type: 'Person',
+      name: object.account.display_name.presence || object.account.username,
+      alternate_name: object.account.local_username_and_domain,
+      identifier: object.account.local_username_and_domain,
+      url: ActivityPub::TagManager.instance.url_for(object.account),
+      interaction_statistic: [
+        {
+          type: 'InteractionCounter',
+          interaction_type: 'https://schema.org/FollowAction',
+          user_interaction_count: object.account.followers_count,
+        },
+      ],
+    }
+  end
+
+  def text
+    status_content_format(object)
+  end
+
+  def interaction_statistic
+    [
+      {
+        type: 'InteractionCounter',
+        interaction_type: 'https://schema.org/LikeAction',
+        user_interaction_count: object.favourites_count,
+      },
+
+      {
+        type: 'InteractionCounter',
+        interaction_type: 'https://schema.org/ShareAction',
+        user_interaction_count: object.reblogs_count,
+      },
+
+      {
+        type: 'InteractionCounter',
+        interaction_type: 'https://schema.org/ReplyAction',
+        user_interaction_count: object.replies_count,
+      },
+    ]
+  end
+
+  def image
+    object.ordered_media_attachments.filter_map do |attachment|
+      next unless attachment.image?
+
+      {
+        type: 'ImageObject',
+        content_url: full_asset_url(attachment.file.url(:original, false)),
+        thumbnail_url: attachment.thumbnail.present? ? full_asset_url(attachment.thumbnail.url(:original)) : full_asset_url(attachment.file.url(:small)),
+        description: attachment.description,
+      }
+    end
+  end
+
+  def video
+    object.ordered_media_attachments.filter_map do |attachment|
+      next unless attachment.video? || attachment.gifv?
+
+      {
+        type: 'VideoObject',
+        upload_date: attachment.created_at.iso8601,
+        content_url: full_asset_url(attachment.file.url(:original, false)),
+        thumbnail_url: attachment.thumbnail.present? ? full_asset_url(attachment.thumbnail.url(:original)) : full_asset_url(attachment.file.url(:small)),
+        embed_url: medium_player_url(attachment),
+        description: attachment.description,
+      }
+    end
+  end
+
+  def audio
+    object.ordered_media_attachments.filter_map do |attachment|
+      next unless attachment.audio?
+
+      {
+        type: 'AudioObject',
+        upload_date: attachment.created_at.iso8601,
+        content_url: full_asset_url(attachment.file.url(:original, false)),
+        thumbnail_url: attachment.thumbnail.present? ? full_asset_url(attachment.thumbnail.url(:original)) : full_asset_url(attachment.file.url(:small)),
+        embed_url: medium_player_url(attachment),
+        description: attachment.description,
+      }
+    end
+  end
+
+  def shared_content
+    {
+      type: 'WebPage',
+      url: object.preview_card.url,
+    }
+  end
+end