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: / var / canvas / app / models /
Filename : thumbnail.rb
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# frozen_string_literal: true

#
# Copyright (C) 2011 - present Instructure, Inc.
#
# This file is part of Canvas.
#
# Canvas is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, version 3 of the License.
#
# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#

class Thumbnail < ActiveRecord::Base
  belongs_to :attachment, foreign_key: "parent_id"

  # the ":keep_profile => true" part is in here so that we tell mini_magic to not try to pass the command line option -strip.
  # this is because on the servers we are actually using graphics_magic not image_magic's mogrify and graphics_magick doesn't
  # support -strip. you'd get something like:
  # MiniMagick::Error (Command ("mogrify -strip -resize \"200x50\" \"/tmp/mini_magick23816-1\"") failed: {:status_code=>1, :output=>"mogrify: Unrecognized option (-strip).\n"}):#012
  has_attachment(
    content_type: :image,
    storage: (Attachment.local_storage? ? :file_system : :s3),
    path_prefix: Attachment.file_store_config["path_prefix"],
    s3_access: "private",
    keep_profile: true,
    thumbnail_max_image_size_pixels: Setting.get("thumbnail_max_image_size_pixels", 100_000_000).to_i
  )

  before_save :set_namespace
  def set_namespace
    self.namespace = attachment.namespace
  end

  def local_storage_path
    "#{HostUrl.context_host(attachment.context)}/images/thumbnails/show/#{id}/#{uuid}"
  end

  delegate :bucket, to: :attachment

  def cached_s3_url
    @cached_s3_url = authenticated_s3_url(expires_in: 144.hours)
  end

  before_save :assign_uuid
  def assign_uuid
    self.uuid ||= CanvasSlug.generate_securish_uuid
  end
  protected :assign_uuid
end