about summary refs log tree commit diff
path: root/app/services/backup_service.rb
blob: b880dfbe71e54a296e36dd86e9da88594056aabe (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
# frozen_string_literal: true

require 'rubygems/package'

class BackupService < BaseService
  include Payloadable

  attr_reader :account, :backup, :collection

  def call(backup)
    @backup  = backup
    @account = backup.user.account

    build_json!
    build_archive!
  end

  private

  def build_json!
    @collection = serialize(collection_presenter, ActivityPub::CollectionSerializer)

    account.statuses.with_includes.reorder(nil).find_in_batches do |statuses|
      statuses.each do |status|
        item = serialize_payload(ActivityPub::ActivityPresenter.from_status(status), ActivityPub::ActivitySerializer, signer: @account)
        item.delete(:@context)

        unless item[:type] == 'Announce' || item[:object][:attachment].blank?
          item[:object][:attachment].each do |attachment|
            attachment[:url] = Addressable::URI.parse(attachment[:url]).path.gsub(/\A\/system\//, '')
          end
        end

        @collection[:orderedItems] << item
      end

      GC.start
    end
  end

  def build_archive!
    tmp_file = Tempfile.new(%w(archive .tar.gz))

    File.open(tmp_file, 'wb') do |file|
      Zlib::GzipWriter.wrap(file) do |gz|
        Gem::Package::TarWriter.new(gz) do |tar|
          dump_media_attachments!(tar)
          dump_outbox!(tar)
          dump_likes!(tar)
          dump_bookmarks!(tar)
          dump_actor!(tar)
        end
      end
    end

    archive_filename = ['archive', Time.now.utc.strftime('%Y%m%d%H%M%S'), SecureRandom.hex(16)].join('-') + '.tar.gz'

    @backup.dump      = ActionDispatch::Http::UploadedFile.new(tempfile: tmp_file, filename: archive_filename)
    @backup.processed = true
    @backup.save!
  ensure
    tmp_file.close
    tmp_file.unlink
  end

  def dump_media_attachments!(tar)
    MediaAttachment.attached.where(account: account).reorder(nil).find_in_batches do |media_attachments|
      media_attachments.each do |m|
        next unless m.file&.path

        download_to_tar(tar, m.file, m.file.path)
      end

      GC.start
    end
  end

  def dump_outbox!(tar)
    json = Oj.dump(collection)

    tar.add_file_simple('outbox.json', 0o444, json.bytesize) do |io|
      io.write(json)
    end
  end

  def dump_actor!(tar)
    actor = serialize(account, ActivityPub::ActorSerializer)

    actor[:icon][:url]  = 'avatar' + File.extname(actor[:icon][:url])  if actor[:icon]
    actor[:image][:url] = 'header' + File.extname(actor[:image][:url]) if actor[:image]
    actor[:outbox]      = 'outbox.json'
    actor[:likes]       = 'likes.json'
    actor[:bookmarks]   = 'bookmarks.json'

    download_to_tar(tar, account.avatar, 'avatar' + File.extname(account.avatar.path)) if account.avatar.exists?
    download_to_tar(tar, account.header, 'header' + File.extname(account.header.path)) if account.header.exists?

    json = Oj.dump(actor)

    tar.add_file_simple('actor.json', 0o444, json.bytesize) do |io|
      io.write(json)
    end
  end

  def dump_likes!(tar)
    collection = serialize(ActivityPub::CollectionPresenter.new(id: 'likes.json', type: :ordered, size: 0, items: []), ActivityPub::CollectionSerializer)

    Status.reorder(nil).joins(:favourites).includes(:account).merge(account.favourites).find_in_batches do |statuses|
      statuses.each do |status|
        collection[:totalItems] += 1
        collection[:orderedItems] << ActivityPub::TagManager.instance.uri_for(status)
      end

      GC.start
    end

    json = Oj.dump(collection)

    tar.add_file_simple('likes.json', 0o444, json.bytesize) do |io|
      io.write(json)
    end
  end

  def dump_bookmarks!(tar)
    collection = serialize(ActivityPub::CollectionPresenter.new(id: 'bookmarks.json', type: :ordered, size: 0, items: []), ActivityPub::CollectionSerializer)

    Status.reorder(nil).joins(:bookmarks).includes(:account).merge(account.bookmarks).find_in_batches do |statuses|
      statuses.each do |status|
        collection[:totalItems] += 1
        collection[:orderedItems] << ActivityPub::TagManager.instance.uri_for(status)
      end

      GC.start
    end

    json = Oj.dump(collection)

    tar.add_file_simple('bookmarks.json', 0o444, json.bytesize) do |io|
      io.write(json)
    end
  end

  def collection_presenter
    ActivityPub::CollectionPresenter.new(
      id: 'outbox.json',
      type: :ordered,
      size: account.statuses_count,
      items: []
    )
  end

  def serialize(object, serializer)
    ActiveModelSerializers::SerializableResource.new(
      object,
      serializer: serializer,
      adapter: ActivityPub::Adapter
    ).as_json
  end

  CHUNK_SIZE = 1.megabyte

  def download_to_tar(tar, attachment, filename)
    adapter = Paperclip.io_adapters.for(attachment)

    tar.add_file_simple(filename, 0o444, adapter.size) do |io|
      while (buffer = adapter.read(CHUNK_SIZE))
        io.write(buffer)
      end
    end
  rescue Errno::ENOENT, Seahorse::Client::NetworkingError => e
    Rails.logger.warn "Could not backup file #{filename}: #{e}"
  end
end