Fix sharing status with local users when importing archive

* Local contacts also start sharing again with imported user if they
  were sharing with the old account
* Don't create empty contact entities for contacts which the imported
  user doesn't share with and also maybe the contact doesn't share with
  the importer
* Ensure people which were a contact in the archive still receive the
  migration, even when the importer doesn't share with them, so they can
  resend their contact message

fixes #8106 for real this time

app/models/account_migration.rb

@@ -14,6 +14,8 @@ class AccountMigration < ApplicationRecord
   attr_accessor :old_private_key
   attr_writer :old_person_diaspora_id
 
+  attr_accessor :archive_contacts
+
   def receive(*)
     perform!
   end
@@ -29,10 +31,11 @@ class AccountMigration < ApplicationRecord
   # executes a migration plan according to this AccountMigration object
   def perform!
     raise "already performed" if performed?
+
     validate_sender if locally_initiated?
     tombstone_old_user_and_update_all_references if old_person
     dispatch if locally_initiated?
-    dispatch_contacts if remotely_initiated?
+    dispatch_contacts
     update(completed_at: Time.zone.now)
   end
 
@@ -40,13 +43,20 @@ class AccountMigration < ApplicationRecord
     !completed_at.nil?
   end
 
-  # We assume that migration message subscribers are people that are subscribed to a new user profile updates.
+  # Send migration to all imported contacts, but also send it to all contacts from the archive which weren't imported,
-  # Since during the migration we update contact references, this includes all the contacts of the old person.
+  # but maybe share with the old account, so they can update contact information and resend the contact message.
   # In case when a user migrated to our pod from a remote one, we include remote person to subscribers so that
   # the new pod is informed about the migration as well.
   def subscribers
     new_user.profile.subscribers.remote.to_a.tap do |subscribers|
       subscribers.push(old_person) if old_person&.remote?
+      archive_contacts&.each do |contact|
+        diaspora_id = contact.fetch("account_id")
+        next if subscribers.any? {|s| s.diaspora_handle == diaspora_id }
+
+        person = Person.by_account_identifier(diaspora_id)
+        subscribers.push(person) if person&.remote?
+      end
     end
   end
 

app/services/migration_service.rb

@@ -49,7 +49,8 @@ class MigrationService
       old_person:             old_person,
       new_person:             archive_importer.user.person,
       old_private_key:        archive_importer.serialized_private_key,
-      old_person_diaspora_id: archive_importer.archive_author_diaspora_id
+      old_person_diaspora_id: archive_importer.archive_author_diaspora_id,
+      archive_contacts:       archive_importer.contacts
     )
   end
 

lib/archive_importer/contact_importer.rb

@@ -13,6 +13,8 @@ class ArchiveImporter
     attr_reader :user
 
     def import
+      return unless json.fetch("receiving")
+
       @imported_contact = create_contact
       add_to_aspects
     rescue ActiveRecord::RecordInvalid => e
@@ -34,7 +36,8 @@ class ArchiveImporter
 
     def create_contact
       person = Person.by_account_identifier(json.fetch("account_id"))
-      user.contacts.create!(person_id: person.id, sharing: false, receiving: json.fetch("receiving"))
+      # see AccountMigration#dispatch_contacts for the other half of this when the contact is sharing with the user
+      user.contacts.create!(person_id: person.id, sharing: false, receiving: true)
     end
   end
 end

spec/integration/migration_service_spec.rb

@@ -128,7 +128,7 @@ describe MigrationService do
             "following": true,
             "followed": false,
             "account_id": "#{contact1_diaspora_id}",
-            "contact_groups_membership": ["Family"]
+            "contact_groups_membership": []
           },
           {
             "sharing": true,
@@ -286,9 +286,7 @@ describe MigrationService do
       expect(like.author).not_to eq(user.person)
 
       contact = user.contacts.find_by(person: Person.by_account_identifier(contact1_diaspora_id))
-      expect(contact).not_to be_nil
+      expect(contact).to be_nil
-      expect(contact.sharing).to be_falsey
-      expect(contact.receiving).to be_falsey
 
       contact = user.contacts.find_by(person: Person.by_account_identifier(contact2_diaspora_id))
       expect(contact).not_to be_nil

spec/models/account_migration_spec.rb

@@ -93,6 +93,34 @@ describe AccountMigration, type: :model do
           expect(account_migration.subscribers).to be_empty
         end
       end
+
+      context "with contacts from the archive" do
+        it "includes contacts from the archive" do
+          archive_person = FactoryBot.create(:person)
+          remote_contact = DataGenerator.create(new_user, :remote_mutual_friend)
+          contacts = [
+            {
+              "sharing"                   => true,
+              "receiving"                 => false,
+              "following"                 => true,
+              "followed"                  => false,
+              "account_id"                => archive_person.diaspora_handle,
+              "contact_groups_membership" => []
+            },
+            {
+              "sharing"                   => true,
+              "receiving"                 => true,
+              "following"                 => true,
+              "followed"                  => true,
+              "account_id"                => remote_contact.person.diaspora_handle,
+              "contact_groups_membership" => []
+            }
+          ]
+          account_migration =
+            AccountMigration.create!(old_person: old_person, new_person: new_person, archive_contacts: contacts)
+          expect(account_migration.subscribers).to match_array([remote_contact.person, archive_person, old_person])
+        end
+      end
     end
   end