summaryrefslogtreecommitdiff
path: root/app/models/upload.rb
blob: 13987931b0505820cfb4b55268f4ac39d36821b0 (plain)
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
class Upload < ActiveRecord::Base
  # Upper limit for foreground checksum processing
  CHECKSUM_THRESHOLD = 100.megabytes

  belongs_to :model, polymorphic: true

  validates :size, presence: true
  validates :path, presence: true
  validates :model, presence: true
  validates :uploader, presence: true

  before_save  :calculate_checksum, if:     :foreground_checksum?
  after_commit :schedule_checksum,  unless: :foreground_checksum?

  def self.remove_path(path)
    where(path: path).destroy_all
  end

  def self.record(uploader)
    remove_path(uploader.relative_path)

    create(
      size: uploader.file.size,
      path: uploader.relative_path,
      model: uploader.model,
      uploader: uploader.class.to_s
    )
  end

  def absolute_path
    return path unless relative_path?

    uploader_class.absolute_path(self)
  end

  def calculate_checksum
    return unless exist?

    self.checksum = Digest::SHA256.file(absolute_path).hexdigest
  end

  def exist?
    File.exist?(absolute_path)
  end

  private

  def foreground_checksum?
    size <= CHECKSUM_THRESHOLD
  end

  def schedule_checksum
    UploadChecksumWorker.perform_async(id)
  end

  def relative_path?
    !path.start_with?('/')
  end

  def uploader_class
    Object.const_get(uploader)
  end
end