matrix-js-sdk/lib/event-mapper.js

Matrix Client-Server SDK for Javascript

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.eventMapperFor = eventMapperFor;
var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
var _event = require("./models/event");
function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); enumerableOnly && (symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; })), keys.push.apply(keys, symbols); } return keys; }
function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = null != arguments[i] ? arguments[i] : {}; i % 2 ? ownKeys(Object(source), !0).forEach(function (key) { (0, _defineProperty2.default)(target, key, source[key]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)) : ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } return target; }
function eventMapperFor(client, options) {
  let preventReEmit = Boolean(options.preventReEmit);
  const decrypt = options.decrypt !== false;
  function mapper(plainOldJsObject) {
    if (options.toDevice) {
      delete plainOldJsObject.room_id;
    }
    const room = client.getRoom(plainOldJsObject.room_id);
    let event;
    // If the event is already known to the room, let's re-use the model rather than duplicating.
    // We avoid doing this to state events as they may be forward or backwards looking which tweaks behaviour.
    if (room && plainOldJsObject.state_key === undefined) {
      event = room.findEventById(plainOldJsObject.event_id);
    }
    if (!event || event.status) {
      event = new _event.MatrixEvent(plainOldJsObject);
    } else {
      // merge the latest unsigned data from the server
      event.setUnsigned(_objectSpread(_objectSpread({}, event.getUnsigned()), plainOldJsObject.unsigned));
      // prevent doubling up re-emitters
      preventReEmit = true;
    }
    const thread = room === null || room === void 0 ? void 0 : room.findThreadForEvent(event);
    if (thread) {
      event.setThread(thread);
    }

    // TODO: once we get rid of the old libolm-backed crypto, we can restrict this to room events (rather than
    //   to-device events), because the rust implementation decrypts to-device messages at a higher level.
    //   Generally we probably want to use a different eventMapper implementation for to-device events because
    if (event.isEncrypted()) {
      if (!preventReEmit) {
        client.reEmitter.reEmit(event, [_event.MatrixEventEvent.Decrypted]);
      }
      if (decrypt) {
        client.decryptEventIfNeeded(event);
      }
    }
    if (!preventReEmit) {
      client.reEmitter.reEmit(event, [_event.MatrixEventEvent.Replaced, _event.MatrixEventEvent.VisibilityChange]);
      room === null || room === void 0 ? void 0 : room.reEmitter.reEmit(event, [_event.MatrixEventEvent.BeforeRedaction]);
    }
    return event;
  }
  return mapper;
}
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