hometown/app/models/media_attachment.rb
Eugen Rochko a7171af0a3
Fix avatar and header issues by using custom geometry detector (#6515)
* Fix avatar and header issues by using custom geometry detector

Revert a part of #6508. The file passed to dynamic styles method
was not actually a file, but an instance of Paperclip::Attachment,
which broke all styles by always returning {} from the method.

One problem with GIF avatars was that Paperclip::GeometryDetector
reported wrong dimensions for them, e.g. 120x120 GIF avatar would
for some reason be detected as 120x53. By writing our own geometry
parser, we can use FastImage, which also happens to be faster than
ImageMagick, to detect image dimensions, which are also correct.

Unfortunately, this PR does not implement skipping a `convert`
entirely if the dimensions are already correct, as I found no easy
way to write that behaviour into Paperclip without rewriting the
Paperclip::Thumbnail class.

* Only invoke convert if dimension or format needs to be changed
2018-02-21 03:40:12 +01:00

216 lines
5.5 KiB
Ruby

# 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: {
geometry: '1280x1280>',
file_geometry_parser: FastGeometryParser,
},
small: {
geometry: '400x400>',
file_geometry_parser: FastGeometryParser,
},
}.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|
meta[style] = style == :small || image? ? image_geometry(file) : video_metadata(file)
end
meta
end
def image_geometry(file)
width, height = FastImage.size(file.path)
return {} if width.nil?
{
width: width,
height: height,
size: "#{width}x#{height}",
aspect: width.to_f / height.to_f,
}
end
def video_metadata(file)
movie = FFMPEG::Movie.new(file.path)
return {} unless movie.valid?
{
width: movie.width,
height: movie.height,
frame_rate: movie.frame_rate,
duration: movie.duration,
bitrate: movie.bitrate,
}
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