Add experimental basic quote post authoring (#35355)

app/lib/activitypub/activity.rb

@@ -116,6 +116,20 @@ class ActivityPub::Activity
     fetch_remote_original_status
   end
 
+  def quote_from_request_json(json)
+    quoted_status_uri = value_or_id(json['object'])
+    quoting_status_uri = value_or_id(json['instrument'])
+    return if quoting_status_uri.nil? || quoted_status_uri.nil?
+
+    quoting_status = status_from_uri(quoting_status_uri)
+    return unless quoting_status.present? && quoting_status.quote.present?
+
+    quoted_status = status_from_uri(quoted_status_uri)
+    return unless quoted_status.present? && quoted_status.account == @account && quoting_status.quote.quoted_status == quoted_status
+
+    quoting_status.quote
+  end
+
   def dereference_object!
     return unless @object.is_a?(String)
 
@@ -143,6 +157,10 @@ class ActivityPub::Activity
     @follow_request_from_object ||= FollowRequest.find_by(target_account: @account, uri: object_uri) unless object_uri.nil?
   end
 
+  def quote_request_from_object
+    @quote_request_from_object ||= Quote.find_by(quoted_account: @account, activity_uri: object_uri) unless object_uri.nil?
+  end
+
   def follow_from_object
     @follow_from_object ||= ::Follow.find_by(target_account: @account, uri: object_uri) unless object_uri.nil?
   end

app/lib/activitypub/activity/accept.rb

@@ -4,10 +4,13 @@ class ActivityPub::Activity::Accept < ActivityPub::Activity
   def perform
     return accept_follow_for_relay if relay_follow?
     return accept_follow!(follow_request_from_object) unless follow_request_from_object.nil?
+    return accept_quote!(quote_request_from_object) unless quote_request_from_object.nil?
 
     case @object['type']
     when 'Follow'
       accept_embedded_follow
+    when 'QuoteRequest'
+      accept_embedded_quote_request
     end
   end
 
@@ -31,6 +34,29 @@ class ActivityPub::Activity::Accept < ActivityPub::Activity
     RemoteAccountRefreshWorker.perform_async(request.target_account_id) if is_first_follow
   end
 
+  def accept_embedded_quote_request
+    approval_uri = value_or_id(first_of_value(@json['result']))
+    return if approval_uri.nil?
+
+    quote = quote_from_request_json(@object)
+    return unless quote.present? && quote.status.local?
+
+    accept_quote!(quote)
+  end
+
+  def accept_quote!(quote)
+    approval_uri = value_or_id(first_of_value(@json['result']))
+    return if unsupported_uri_scheme?(approval_uri) || quote.quoted_account != @account || !quote.status.local?
+
+    # NOTE: we are not going through `ActivityPub::VerifyQuoteService` as the `Accept` is as authoritative
+    # as the stamp, but this means we are not checking the stamp, which may lead to inconsistencies
+    # in case of an implementation bug
+    quote.update!(state: :accepted, approval_uri: approval_uri)
+
+    DistributionWorker.perform_async(quote.status_id, { 'update' => true })
+    ActivityPub::StatusUpdateDistributionWorker.perform_async(quote.status_id, { 'updated_at' => Time.now.utc.iso8601 })
+  end
+
   def accept_follow_for_relay
     relay.update!(state: :accepted)
   end

app/lib/activitypub/activity/reject.rb

@@ -5,10 +5,13 @@ class ActivityPub::Activity::Reject < ActivityPub::Activity
     return reject_follow_for_relay if relay_follow?
     return follow_request_from_object.reject! unless follow_request_from_object.nil?
     return UnfollowService.new.call(follow_from_object.account, @account) unless follow_from_object.nil?
+    return reject_quote!(quote_request_from_object) unless quote_request_from_object.nil?
 
     case @object['type']
     when 'Follow'
       reject_embedded_follow
+    when 'QuoteRequest'
+      reject_embedded_quote_request
     end
   end
 
@@ -29,6 +32,20 @@ class ActivityPub::Activity::Reject < ActivityPub::Activity
     relay.update!(state: :rejected)
   end
 
+  def reject_embedded_quote_request
+    quote = quote_from_request_json(@object)
+    return unless quote.present? && quote.status.local?
+
+    reject_quote!(quoting_status.quote)
+  end
+
+  def reject_quote!(quote)
+    return unless quote.quoted_account == @account && quote.status.local?
+
+    # TODO: broadcast an update?
+    quote.reject!
+  end
+
   def relay
     @relay ||= Relay.find_by(follow_activity_id: object_uri) unless object_uri.nil?
   end

app/lib/activitypub/case_transform.rb

@@ -12,9 +12,7 @@ module ActivityPub::CaseTransform
       when Hash then value.deep_transform_keys! { |key| camel_lower(key) }
       when Symbol then camel_lower(value.to_s).to_sym
       when String
-        camel_lower_cache[value] ||= if value.start_with?('_:')
-                                       "_:#{value.delete_prefix('_:').underscore.camelize(:lower)}"
-                                     elsif LanguagesHelper::ISO_639_1_REGIONAL.key?(value.to_sym)
+        camel_lower_cache[value] ||= if value.start_with?('_misskey') || LanguagesHelper::ISO_639_1_REGIONAL.key?(value.to_sym)
                                        value
                                      else
                                        value.underscore.camelize(:lower)