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

#
# Copyright (C) 2014 - 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 MediaSourceFetcher
  def initialize(api_client)
    @api_client = api_client
  end

  def fetch_preferred_source_url(options = {})
    file_extension = options[:file_extension]
    media_type = options[:media_type]

    if file_extension && media_type
      raise ArgumentError, "file_extension and media_type should not both be present. file_extension is only here to support legacy behavior."
    end

    media_sources = @api_client.media_sources(options[:media_id])

    return nil if media_sources.empty?

    source = case media_type
             when "video"
               find_by_file_extension(media_sources, "mp4")
             when "audio"
               find_by_file_extension(media_sources, "mp3") || find_by_file_extension(media_sources, "mp4")
             else
               find_by_file_extension(media_sources, file_extension)
             end

    source[:url]
  end

  private

  def find_by_file_extension(sources, file_extension)
    sources.find { |s| s[:fileExt] == file_extension }
  end
end