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# frozen_string_literal: true
# == Schema Information
#
# Table name: preview_cards
#
# id :bigint(8) not null, primary key
# url :string default(""), not null
# title :string default(""), not null
# description :string default(""), not null
# image_file_name :string
# image_content_type :string
# image_file_size :integer
# image_updated_at :datetime
# type :integer default("link"), not null
# html :text default(""), not null
# author_name :string default(""), not null
# author_url :string default(""), not null
# provider_name :string default(""), not null
# provider_url :string default(""), not null
# width :integer default(0), not null
# height :integer default(0), not null
# created_at :datetime not null
# updated_at :datetime not null
# embed_url :string default(""), not null
# image_storage_schema_version :integer
# blurhash :string
# language :string
# max_score :float
# max_score_at :datetime
# trendable :boolean
# link_type :integer
#
class PreviewCard < ApplicationRecord
include Attachmentable
IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'].freeze
LIMIT = 2.megabytes
BLURHASH_OPTIONS = {
x_comp: 4,
y_comp: 4,
}.freeze
self.inheritance_column = false
enum type: { link: 0, photo: 1, video: 2, rich: 3 }
enum link_type: { unknown: 0, article: 1 }
has_and_belongs_to_many :statuses
has_one :trend, class_name: 'PreviewCardTrend', inverse_of: :preview_card, dependent: :destroy
has_attached_file :image, processors: [:thumbnail, :blurhash_transcoder], styles: ->(f) { image_styles(f) }, convert_options: { all: '-quality 90 +profile "!icc,*" +set modify-date +set create-date' }, validate_media_type: false
validates :url, presence: true, uniqueness: true
validates_attachment_content_type :image, content_type: IMAGE_MIME_TYPES
validates_attachment_size :image, less_than: LIMIT
remotable_attachment :image, LIMIT
scope :cached, -> { where.not(image_file_name: [nil, '']) }
before_save :extract_dimensions, if: :link?
def appropriate_for_trends?
link? && article? && title.present? && description.present? && image.present? && provider_name.present?
end
def domain
@domain ||= Addressable::URI.parse(url).normalized_host
end
def provider
@provider ||= PreviewCardProvider.matching_domain(domain)
end
def trendable?
if attributes['trendable'].nil?
provider&.trendable?
else
attributes['trendable']
end
end
def requires_review?
attributes['trendable'].nil? && (provider.nil? || provider.requires_review?)
end
def requires_review_notification?
attributes['trendable'].nil? && (provider.nil? || provider.requires_review_notification?)
end
def decaying?
max_score_at && max_score_at >= Trends.links.options[:max_score_cooldown].ago && max_score_at < 1.day.ago
end
attr_writer :provider
def local?
false
end
def missing_image?
width.present? && height.present? && image_file_name.blank?
end
def save_with_optional_image!
save!
rescue ActiveRecord::RecordInvalid
self.image = nil
save!
end
def history
@history ||= Trends::History.new('links', id)
end
class << self
private
def image_styles(file)
styles = {
original: {
pixels: 230_400, # 640x360px
file_geometry_parser: FastGeometryParser,
convert_options: '-coalesce',
blurhash: BLURHASH_OPTIONS,
},
}
styles[:original][:format] = 'jpg' if file.instance.image_content_type == 'image/gif'
styles
end
end
private
def extract_dimensions
file = image.queued_for_write[:original]
return if file.nil?
width, height = FastImage.size(file.path)
return nil if width.nil?
self.width = width
self.height = height
end
end
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