content_script.js

'use strict';

// make sure we are in strict mode
(function() {
  var strictMode = false;
  try {
    NaN = NaN;
  } catch (err) {
    strictMode = true;
  }
  if (!strictMode) {
    throw 'Unable to activate strict mode.';
  }
})();

(function() {
  // make sure the content script is only run once on the page
  if (!window.netflixPartyLoaded) {
    window.netflixPartyLoaded = true;

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    jQuery.noConflict();

    //////////////////////////////////////////////////////////////////////////
    // Netflix API                                                          //
    //////////////////////////////////////////////////////////////////////////

    // how many simulated UI events are currently going on
    // don't respond to UI events unless this is 0, otherwise
    // we will mistake simulated actions for real ones
    var uiEventsHappening = 0;

    // video duration in milliseconds
    var duration = Math.floor(jQuery('.player-video-wrapper video')[0].duration * 1000);

    // 'playing', 'paused', 'loading', or 'idle'
    var getState = function() {
      if (jQuery('.timeout-wrapper.player-active .icon-play').length > 0) {
        return 'idle';
      }
      if (jQuery('.player-progress-round.player-hidden').length === 0) {
        return 'loading';
      }
      if (jQuery('.player-control-button.player-play-pause.play').length === 0) {
        return 'playing';
      } else {
        return 'paused';
      }
    };

    // current playback position in milliseconds
    var getPlaybackPosition = function() {
      return Math.floor(jQuery('.player-video-wrapper video')[0].currentTime * 1000);
    };

    // wake up from idle mode
    var wakeUp = function() {
      uiEventsHappening += 1;
      return new Promise(function(resolve, reject) {
        jQuery('.timeout-wrapper.player-active .icon-play').click();
        setTimeout(function() {
          uiEventsHappening -= 1;
          resolve();
        }, 10);
      });
    };

    // show the playback controls
    var showControls = function() {
      uiEventsHappening += 1;
      return new Promise(function(resolve, reject) {
        var scrubber = jQuery('#scrubber-component');
        var eventOptions = {
          'bubbles': true,
          'button': 0,
          'currentTarget': scrubber[0]
        };
        scrubber[0].dispatchEvent(new MouseEvent('mousemove', eventOptions));
        setTimeout(function() {
          uiEventsHappening -= 1;
          resolve();
        }, 10);
      });
    };

    // hide the playback controls
    var hideControls = function() {
      uiEventsHappening += 1;
      return new Promise(function(resolve, reject) {
        var player = jQuery('#netflix-player');
        var mouseX = 100; // relative to the document
        var mouseY = 100; // relative to the document
        var eventOptions = {
          'bubbles': true,
          'button': 0,
          'screenX': mouseX - jQuery(window).scrollLeft(),
          'screenY': mouseY - jQuery(window).scrollTop(),
          'clientX': mouseX - jQuery(window).scrollLeft(),
          'clientY': mouseY - jQuery(window).scrollTop(),
          'offsetX': mouseX - player.offset().left,
          'offsetY': mouseY - player.offset().top,
          'pageX': mouseX,
          'pageY': mouseY,
          'currentTarget': player[0]
        };
        player[0].dispatchEvent(new MouseEvent('mousemove', eventOptions));
        setTimeout(function() {
          uiEventsHappening -= 1;
          resolve();
        }, 1);
      });
    };

    // pause
    var pause = function() {
      uiEventsHappening += 1;
      return new Promise(function(resolve, reject) {
        jQuery('.player-play-pause.pause').click();
        setTimeout(function() {
          hideControls().then(function() {
            uiEventsHappening -= 1;
            resolve();
          });
        }, 1);
      });
    };

    // play
    var play = function() {
      uiEventsHappening += 1;
      return new Promise(function(resolve, reject) {
        jQuery('.player-play-pause.play').click();
        setTimeout(function() {
          hideControls().then(function() {
            uiEventsHappening -= 1;
            resolve();
          });
        }, 1);
      });
    };

    // jump to a specific time in the video
    // this is, by far, the hackiest code I have ever written
    var seek = function(milliseconds) {
      uiEventsHappening += 1;
      return new Promise(function(resolve, reject) {
        showControls().then(function() {
          // compute the parameters for the mouse events
          var scrubber = jQuery('#scrubber-component');
          var factor = milliseconds / duration;
          var mouseX = scrubber.offset().left + Math.round(scrubber.width() * factor); // relative to the document
          var mouseY = scrubber.offset().top + scrubber.height() / 2;                  // relative to the document
          var eventOptions = {
            'bubbles': true,
            'button': 0,
            'screenX': mouseX - jQuery(window).scrollLeft(),
            'screenY': mouseY - jQuery(window).scrollTop(),
            'clientX': mouseX - jQuery(window).scrollLeft(),
            'clientY': mouseY - jQuery(window).scrollTop(),
            'offsetX': mouseX - scrubber.offset().left,
            'offsetY': mouseY - scrubber.offset().top,
            'pageX': mouseX,
            'pageY': mouseY,
            'currentTarget': scrubber[0]
          };

          // make the "trickplay preview" show up
          scrubber[0].dispatchEvent(new MouseEvent('mouseover', eventOptions));

          setTimeout(function() {
            // simulate a click on the scrubber
            scrubber[0].dispatchEvent(new MouseEvent('mousedown', eventOptions));
            scrubber[0].dispatchEvent(new MouseEvent('mouseup', eventOptions));
            scrubber[0].dispatchEvent(new MouseEvent('mouseout', eventOptions));

            setTimeout(function() {
              hideControls().then(function() {
                uiEventsHappening -= 1;
                resolve();
              });
            }, 1);
          }, 10);
        });
      });
    };

    //////////////////////////////////////////////////////////////////////////
    // Main logic                                                           //
    //////////////////////////////////////////////////////////////////////////

    // the session
    var session = null;
    var needToBroadcast = false;

    // wrapper for ajax requests
    var rountTripTimeRecent = [];
    var rountTripTimeMedian = 0;
    var localTimeMinusServerTimeRecent = [];
    var localTimeMinusServerTimeMedian = 0;
    var ajax = function(relativeUrl, method, data) {
      return new Promise(function(resolve, reject) {
        var startTime = (new Date()).getTime();
        jQuery.ajax({
          url: 'https://www.netflixparty.com' + relativeUrl,
          method: method,
          data: method === 'POST' ? JSON.stringify(data) : data
        }).always(function(data, textStatus, jqXHR) {
          // calculate round trip time
          rountTripTimeRecent.push((new Date()).getTime() - startTime);
          if (rountTripTimeRecent.length > 10) {
            rountTripTimeRecent.splice(0, rountTripTimeRecent.length - 10);
          }
          var sorted = rountTripTimeRecent.concat().sort();
          rountTripTimeMedian = sorted[Math.floor(sorted.length / 2)];

          if (data.lastActivity !== undefined) {
            // calculate client-server time offset
            localTimeMinusServerTimeRecent.push((new Date()).getTime() - (new Date(data.lastActivity)).getTime());
            if (localTimeMinusServerTimeRecent.length > 10) {
              localTimeMinusServerTimeRecent.splice(0, localTimeMinusServerTimeRecent.length - 10);
            }
            sorted = localTimeMinusServerTimeRecent.concat().sort();
            localTimeMinusServerTimeMedian = sorted[Math.floor(sorted.length / 2)] - Math.round(rountTripTimeMedian / 2);
          }
        }).done(resolve).fail(reject);
      });
    };

    // broadcast the session
    var broadcastSession = function() {
      return new Promise(function(resolve, reject) {
        setTimeout(function() {
          var state = getState();
          if (state === 'loading') {
            broadcastSession().then(resolve).catch(reject);
          } else {
            session.state = state === 'playing' ? 'playing' : 'paused';
            session.lastKnownTime = getPlaybackPosition();
            ajax('/sessions/' + session.id + '/update', 'POST', {
              lastKnownTime: session.lastKnownTime + (session.state === 'playing' ? Math.round(rountTripTimeMedian / 2) : 0),
              state: session.state
            }).then(resolve).catch(function() {
              broadcastSession().then(resolve).catch(reject);
            });
          }
        }, 1000);
      });
    };

    // refresh the session
    var refreshSession = function() {
      return new Promise(function(resolve, reject) {
        ajax('/sessions/' + session.id, 'GET', {}).then(function(data) {
          if (needToBroadcast) {
            resolve();
            return;
          }

          session = data;
          session.lastActivity = new Date(session.lastActivity);
          session.lastKnownTimeUpdatedAt = new Date(session.lastKnownTimeUpdatedAt);

          // the main synchronization logic
          var promise = Promise.resolve();
          if (session.state === 'paused') {
            if (getState() === 'playing') {
              promise = promise.then(pause);
            }
            promise = promise.then(function() {
              if (Math.abs(session.lastKnownTime - getPlaybackPosition()) > 1000) {
                return seek(session.lastKnownTime);
              } else {
                return Promise.resolve();
              }
            });
          } else {
            var localTime = getPlaybackPosition();
            var timeEstimate = session.lastKnownTime + ((new Date()).getTime() - (session.lastKnownTimeUpdatedAt.getTime() + localTimeMinusServerTimeMedian));
            if (localTime > timeEstimate + 100 && localTime < timeEstimate + 3000) {
              if (getState() === 'playing') {
                promise = promise.then(pause);
              }
              promise.then(new Promise(function(resolve, reject) {
                setTimeout(function() {
                  play(resolve);
                }, localTime - timeEstimate);
              }));
            } else {
              if (getState() === 'paused') {
                promise = promise.then(play);
              }
              promise.then(function() {
                if (Math.abs(timeEstimate - localTime) > 1000) {
                  return seek(timeEstimate + 2000);
                } else {
                  return Promise.resolve();
                }
              });
            }
          }
          promise.then(resolve).catch(reject);
        });
      });
    };

    var tick = function() {
      setTimeout(function() {
        var state = getState();
        if (session && uiEventsHappening === 0) {
          if (state === 'idle') {
            wakeUp().then(tick);
          } else if (needToBroadcast) {
            broadcastSession().then(function() {
              needToBroadcast = false;
            }).then(tick);
          } else if (state !== 'loading') {
            refreshSession().then(tick);
          }
        } else {
          tick();
        }
      }, 2000);
    };
    tick();

    jQuery(window).click(function() {
      if (uiEventsHappening === 0) {
        needToBroadcast = true;
      }
    });
    jQuery(window).keydown(function() {
      if (uiEventsHappening === 0) {
        needToBroadcast = true;
      }
    });

    // register the message handler
    chrome.runtime.onMessage.addListener(
      function(request, sender, sendResponse) {
        if (request.type === 'setSession') {
          session = request.data;
          session.lastActivity = new Date(session.lastActivity);
          session.lastKnownTimeUpdatedAt = new Date(session.lastKnownTimeUpdatedAt);
          sendResponse({});
          return;
        }
        if (request.type === 'getSession') {
          sendResponse(session);
          return;
        }
        if (request.type === 'start') {
          needToBroadcast = !request.data.joiningOther;
          sendResponse({});
          return;
        }
      }
    );
  }
})();