All files / src processors.ts

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'use strict';
/*
 * Copyright 2021 Algolia
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
import { firestore } from 'firebase-admin/lib/firestore';
import { isValidValue } from './util';
import DocumentReference = firestore.DocumentReference;
import GeoPoint = firestore.GeoPoint;
import Timestamp = firestore.Timestamp;
 
const processObject = objectVal => {
  const payload = {};
  for (const [key, val] of Object.entries(objectVal)) {
    const [field, value] = processValue(key, val);
    if (isValidValue(value)) {
      payload[field] = value;
    }
  }
  return payload;
}
 
const processValue = (field, value) => {
  if (value instanceof DocumentReference) {
    return [field, processDocumentReference(value)];
  } else Iif (value instanceof GeoPoint) {
    // Algolia has a prescribed field name for Geo data.
    return ['_geoloc', processGeoPoint(value)];
  } else if (value instanceof Timestamp) {
    return [field, processTimestamp(value)];
  } else if (value instanceof Array) {
    return [field, processArray(value)];
  } else if (value instanceof Object) {
    return [field, processObject(value)];
  }
  return [field, value]
}
 
const processArray = (arrayVal: Array<any>) => {
  return arrayVal.map((val, index) => {
    if (val instanceof Object) {
      const [_, value] = processValue(index, val);
      return value;
    }
    return val;
  })
}
 
const processTimestamp = (timestampVal: Timestamp) => {
  return timestampVal.toDate().getTime();
}
 
const processDocumentReference = (referenceVal: DocumentReference) => {
  return referenceVal.path
}

const processGeoPoint = (geoPointVal: GeoPoint) => {
  return {
    lat: geoPointVal.latitude,
    lng: geoPointVal.longitude
  }
}
 
/**
 * The data processor will process the Firestore document.  It will loop through the fields and process the values.
 * The value can be simple or complex types that are supported by Firestore.
 *
 * @param data
 */
export const dataProcessor = data => {
  return processObject(data);
}
 
/**
 * The field processor will process the Firestore document field value.
 *
 * @param field
 * @param value
 */
export const valueProcessor = (field, value) => {
  return processValue(field, value);
}