jam-cloud/web/app/controllers/api_recordings_controller.rb

class ApiRecordingsController < ApiController

  before_filter :api_signed_in_user
  before_filter :look_up_recording, :only => [ :show, :stop, :claim, :discard, :keep ]
  before_filter :parse_filename, :only => [ :download, :upload_next_part, :upload_sign, :upload_part_complete, :upload_complete ]

  respond_to :json

  @@log = Logging.logger[ApiRecordingsController]

  # Returns all files this user should be uploading from his client
  def list_uploads
    begin
      result = Recording.list_uploads(current_user, params[:limit], params[:since])
      puts result.inspect
      render :json => result, :status => 200
    rescue
      render :json => { :message => "could not produce list of files" }, :status => 403
    end
  end

  # Returns all files that the user can download
  def list_downloads
    begin
      render :json => Recording.list_downloads(current_user, params[:limit], params[:since]), :status => 200
    rescue
      render :json => { :message => "could not produce list of files" }, :status => 403
    end
  end

  def show
  end

  def download
    raise PermissionError, ValidationMessages::PERMISSION_VALIDATION_ERROR unless @recorded_track.can_download?(current_user)

    redirect_to @recorded_track.sign_url
  end

  def start
    music_session = MusicSession.find(params[:music_session_id])

    raise PermissionError, ValidationMessages::PERMISSION_VALIDATION_ERROR unless music_session.users.exists?(current_user)

    @recording = Recording.start(music_session, current_user)

    if @recording.errors.any?
      response.status = :unprocessable_entity
      respond_with @recording
    else
      respond_with @recording, responder: ApiResponder, :location => api_recordings_detail_url(@recording)
    end
  end
  
  def stop

    @recording.stop

    if @recording.errors.any?
      response.status = :unprocessable_entity
      respond_with @recording
    else
      respond_with @recording, responder: ApiResponder, :location => api_recordings_detail_url(@recording)
    end
  end

  # claim will create a claimed recording for the creator
  def claim
    claim = @recording.claim(current_user, params[:name], params[:description], Genre.find_by_id(params[:genre]), params[:is_public], params[:is_downloadable])
    claim.save

    if claim.errors.any?
      response.status = :unprocessable_entity
      respond_with claim
    else
      respond_with claim, responder: ApiResponder, :location => api_session_detail_url(claim)
    end
  end

  # discard will tell the server the user has no interest in the recording
  def discard
    @recorded_tracks = @recording.recorded_tracks_for_user(current_user)
    RecordedTrack.update(@recorded_tracks, :discard => true)
    render :json => {}, :status => 200
  end

  def upload_next_part
    length = params[:length]
    md5 = params[:md5]

    @recorded_track.upload_next_part(length, md5)

    if @recorded_track.errors.any?

      response.status = :unprocessable_entity
      # this is not typical, but please don't change this line unless you are sure it won't break anything
      # this is needed because after_rollback in the RecordedTrackObserver touches the model and something about it's
      # state doesn't cause errors to shoot out like normal.
      render :json => { :errors => @recorded_track.errors }, :status => 422
    else
      result = {
          :part => @recorded_track.next_part_to_upload,
          :offset => @recorded_track.file_offset.to_s
      }

      render :json => result, :status => 200
    end

  end

  def upload_sign
    render :json => @recorded_track.upload_sign(params[:md5]), :status => 200
  end

  def upload_part_complete
    part = params[:part]
    offset = params[:offset]

    @recorded_track.upload_part_complete(part, offset)

    if @recorded_track.errors.any?
      response.status = :unprocessable_entity
      respond_with @recorded_track
    else
      render :json => {}, :status => 200
    end
  end
  
  def upload_complete
    @recorded_track.upload_complete
    @recorded_track.recording.upload_complete

    if @recorded_track.errors.any?
      response.status = :unprocessable_entity
      respond_with @recorded_track
      return
    else
      render :json => {}, :status => 200
    end
  end



  private

  def parse_filename
    @recorded_track = RecordedTrack.find_by_recording_id_and_client_track_id!(params[:id], params[:track_id])
    raise PermissionError, ValidationMessages::PERMISSION_VALIDATION_ERROR unless @recorded_track.recording.has_access?(current_user)
  end

  def look_up_recording
    @recording = Recording.find(params[:id])
    raise PermissionError, ValidationMessages::PERMISSION_VALIDATION_ERROR unless @recording.has_access?(current_user)
  end

end