about summary refs log tree commit diff
path: root/app/models/media_attachment.rb
blob: 4b84b95fab110d4e060c023828588c0ed6483efb (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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
# frozen_string_literal: true
# == Schema Information
#
# Table name: media_attachments
#
#  id                :integer          not null, primary key
#  status_id         :integer
#  file_file_name    :string
#  file_content_type :string
#  file_file_size    :integer
#  file_updated_at   :datetime
#  remote_url        :string           default(""), not null
#  created_at        :datetime         not null
#  updated_at        :datetime         not null
#  shortcode         :string
#  type              :integer          default("image"), not null
#  file_meta         :json
#  account_id        :integer
#  description       :text
#

require 'mime/types'

class MediaAttachment < ApplicationRecord
  self.inheritance_column = nil

  enum type: [:image, :gifv, :video, :unknown]

  IMAGE_FILE_EXTENSIONS = ['.jpg', '.jpeg', '.png', '.gif'].freeze
  VIDEO_FILE_EXTENSIONS = ['.webm', '.mp4', '.m4v'].freeze

  IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif'].freeze
  VIDEO_MIME_TYPES = ['video/webm', 'video/mp4'].freeze

  IMAGE_STYLES = { original: '1280x1280>', small: '400x400>' }.freeze
  VIDEO_STYLES = {
    small: {
      convert_options: {
        output: {
          vf: 'scale=\'min(400\, iw):min(400\, ih)\':force_original_aspect_ratio=decrease',
        },
      },
      format: 'png',
      time: 0,
    },
  }.freeze

  belongs_to :account, inverse_of: :media_attachments, optional: true
  belongs_to :status,  inverse_of: :media_attachments, optional: true

  has_attached_file :file,
                    styles: ->(f) { file_styles f },
                    processors: ->(f) { file_processors f },
                    convert_options: { all: '-quality 90 -strip' }

  include Remotable

  validates_attachment_content_type :file, content_type: IMAGE_MIME_TYPES + VIDEO_MIME_TYPES
  validates_attachment_size :file, less_than: 8.megabytes

  validates :account, presence: true
  validates :description, length: { maximum: 420 }, if: :local?

  scope :attached,   -> { where.not(status_id: nil) }
  scope :unattached, -> { where(status_id: nil) }
  scope :local,      -> { where(remote_url: '') }
  scope :remote,     -> { where.not(remote_url: '') }

  default_scope { order(id: :asc) }

  def local?
    remote_url.blank?
  end

  def needs_redownload?
    file.blank? && remote_url.present?
  end

  def to_param
    shortcode
  end

  before_create :prepare_description, unless: :local?
  before_create :set_shortcode
  before_post_process :set_type_and_extension
  before_save :set_meta

  class << self
    private

    def file_styles(f)
      if f.instance.file_content_type == 'image/gif'
        {
          small: IMAGE_STYLES[:small],
          original: {
            format: 'mp4',
            convert_options: {
              output: {
                'movflags' => 'faststart',
                'pix_fmt'  => 'yuv420p',
                'vf'       => 'scale=\'trunc(iw/2)*2:trunc(ih/2)*2\'',
                'vsync'    => 'cfr',
                'b:v'      => '1300K',
                'maxrate'  => '500K',
                'bufsize'  => '1300K',
                'crf'      => 18,
              },
            },
          },
        }
      elsif IMAGE_MIME_TYPES.include? f.instance.file_content_type
        IMAGE_STYLES
      else
        VIDEO_STYLES
      end
    end

    def file_processors(f)
      if f.file_content_type == 'image/gif'
        [:gif_transcoder]
      elsif VIDEO_MIME_TYPES.include? f.file_content_type
        [:video_transcoder]
      else
        [:thumbnail]
      end
    end
  end

  private

  def set_shortcode
    self.type = :unknown if file.blank? && !type_changed?

    return unless local?

    loop do
      self.shortcode = SecureRandom.urlsafe_base64(14)
      break if MediaAttachment.find_by(shortcode: shortcode).nil?
    end
  end

  def prepare_description
    self.description = description.strip[0...420] unless description.nil?
  end

  def set_type_and_extension
    self.type = VIDEO_MIME_TYPES.include?(file_content_type) ? :video : :image
    extension = appropriate_extension
    basename  = Paperclip::Interpolations.basename(file, :original)
    file.instance_write :file_name, [basename, extension].delete_if(&:blank?).join('.')
  end

  def set_meta
    meta = populate_meta
    return if meta == {}
    file.instance_write :meta, meta
  end

  def populate_meta
    meta = {}

    file.queued_for_write.each do |style, file|
      begin
        geo = Paperclip::Geometry.from_file file

        meta[style] = {
          width: geo.width.to_i,
          height: geo.height.to_i,
          size: "#{geo.width.to_i}x#{geo.height.to_i}",
          aspect: geo.width.to_f / geo.height.to_f,
        }
      rescue Paperclip::Errors::NotIdentifiedByImageMagickError
        meta[style] = {}
      end
    end

    meta
  end

  def appropriate_extension
    mime_type = MIME::Types[file.content_type]

    extensions_for_mime_type = mime_type.empty? ? [] : mime_type.first.extensions
    original_extension       = Paperclip::Interpolations.extension(file, :original)

    extensions_for_mime_type.include?(original_extension) ? original_extension : extensions_for_mime_type.first
  end
end