Add semi-support for Video/Image objects in ActivityPub (#5848)

* Add semi-support for Video/Image objects in ActivityPub

Video and Image objects will create corresponding status records
with manually crafted text contents (title + URL)

* Extract html-url-finding logic into JsonLdHelper

* Fallback to id when url missing, extract supported object types

1 files changed, 38 insertions, 13 deletions

diff --git a/app/lib/activitypub/activity/create.rb b/app/lib/activitypub/activity/create.rb
index 3e95cbd06..31e0abe39 100644
--- a/app/lib/activitypub/activity/create.rb
+++ b/app/lib/activitypub/activity/create.rb
@@ -1,6 +1,9 @@
 # frozen_string_literal: true
 
 class ActivityPub::Activity::Create < ActivityPub::Activity
+  SUPPORTED_TYPES = %w(Article Note).freeze
+  CONVERTED_TYPES = %w(Image Video).freeze
+
   def perform
     return if delete_arrived_first?(object_uri) || unsupported_object_type?
 
@@ -41,7 +44,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
       url: object_url || @object['id'],
       account: @account,
       text: text_from_content || '',
-      language: language_from_content,
+      language: detected_language,
       spoiler_text: @object['summary'] || '',
       created_at: @options[:override_timestamps] ? nil : @object['published'],
       reply: @object['inReplyTo'].present?,
@@ -165,40 +168,62 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
   end
 
   def text_from_content
+    return Formatter.instance.linkify([text_from_name, object_url || @object['id']].join(' ')) if converted_object_type?
+
     if @object['content'].present?
       @object['content']
-    elsif language_map?
+    elsif content_language_map?
       @object['contentMap'].values.first
     end
   end
 
-  def language_from_content
-    return LanguageDetector.instance.detect(text_from_content, @account) unless language_map?
-    @object['contentMap'].keys.first
+  def text_from_name
+    if @object['name'].present?
+      @object['name']
+    elsif name_language_map?
+      @object['nameMap'].values.first
+    end
+  end
+
+  def detected_language
+    if content_language_map?
+      @object['contentMap'].keys.first
+    elsif name_language_map?
+      @object['nameMap'].keys.first
+    elsif supported_object_type?
+      LanguageDetector.instance.detect(text_from_content, @account)
+    end
   end
 
   def object_url
     return if @object['url'].blank?
-
-    value = first_of_value(@object['url'])
-
-    return value if value.is_a?(String)
-
-    value['href']
+    url_to_href(@object['url'], 'text/html')
   end
 
-  def language_map?
+  def content_language_map?
     @object['contentMap'].is_a?(Hash) && !@object['contentMap'].empty?
   end
 
+  def name_language_map?
+    @object['nameMap'].is_a?(Hash) && !@object['nameMap'].empty?
+  end
+
   def unsupported_object_type?
-    @object.is_a?(String) || !%w(Article Note).include?(@object['type'])
+    @object.is_a?(String) || !(supported_object_type? || converted_object_type?)
   end
 
   def unsupported_media_type?(mime_type)
     mime_type.present? && !(MediaAttachment::IMAGE_MIME_TYPES + MediaAttachment::VIDEO_MIME_TYPES).include?(mime_type)
   end
 
+  def supported_object_type?
+    SUPPORTED_TYPES.include?(@object['type'])
+  end
+
+  def converted_object_type?
+    CONVERTED_TYPES.include?(@object['type'])
+  end
+
   def skip_download?
     return @skip_download if defined?(@skip_download)
     @skip_download ||= DomainBlock.find_by(domain: @account.domain)&.reject_media?