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

class ApiJamTracksController < ApiController

  # have to be signed in currently to see this screen
  before_filter :api_signed_in_user
  before_filter :lookup_jam_track_right, :only => [:download,:enqueue, :show_jam_track_right]
  
  respond_to :json

  def index    
    data = JamTrack.index(params, current_user)
    @jam_tracks, @next = data[0], data[1]
    
    render "api_jam_tracks/index", :layout => nil
  end

  def purchased
    params[:show_purchased_only] = true
    data = JamTrack.index(params, current_user)
    @jam_tracks, @next = data[0], data[1]

    response.headers['total-entries'] = @jam_tracks.total_entries.to_s

    render "api_jam_tracks/purchased", :layout => nil
  end

  def downloads
    begin
      render :json => JamTrack.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 download  
    if @jam_track_right.valid?      
      if (@jam_track_right && @jam_track_right.signed && @jam_track_right.url.present? &&@jam_track_right.url.file.exists?)
        JamTrackRight.where(:id => self.id).update_all(:last_downloaded_at => Time.now)
        @jam_track_right.update_download_count      
        @jam_track_right.save!
        redirect_to @jam_track_right.sign_url
      else
        @jam_track_right.enqueue_if_needed
        render :json => { :message => "not available, digitally signing Jam Track offline." }, :status => 202
      end
    else
      render :json => { :message => "download limit surpassed", :errors=>@jam_track_right.errors }, :status => 403
    end        
  end

  def enqueue
    @jam_track_right.enqueue_if_needed

    render :json => { :message => "enqueued" }, :status => 200
  end

  def show_jam_track_right

  end

  def keys
    jamtrack_ids = params[:jamtracks]

    unless jamtrack_ids.kind_of?(Array)
      render :json => {message: 'jamtracks parameter must be an array'}, :status => 200
      return
    end

    @jam_tracks = JamTrackRight.list_keys(current_user, params[:jamtracks])

    render "api_jam_tracks/list_keys", :layout => nil
  end

private
  def lookup_jam_track_right
    @jam_track_right = JamTrackRight.where("jam_track_id=? AND user_id=?", params[:id], current_user.id).first
    raise PermissionError, ValidationMessages::PERMISSION_VALIDATION_ERROR unless @jam_track_right
  end

end # class ApiJamTracksController