browser_platform.ts

/**
 * Copyright 2017 Google Inc.
 *
 * 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
 *
 *   http://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 { DatabaseId, DatabaseInfo } from '../core/database_info';
import { Platform } from '../platform/platform';
import { Connection } from '../remote/connection';
import { JsonProtoSerializer } from '../remote/serializer';

import { WebChannelConnection } from './webchannel_connection';
import { AnyJs } from '../util/misc';

export class BrowserPlatform implements Platform {
  readonly base64Available: boolean;

  readonly emptyByteString = '';

  constructor() {
    this.base64Available = typeof atob !== 'undefined';
  }

  loadConnection(databaseInfo: DatabaseInfo): Promise<Connection> {
    return Promise.resolve(new WebChannelConnection(databaseInfo));
  }

  newSerializer(databaseId: DatabaseId): JsonProtoSerializer {
    return new JsonProtoSerializer(databaseId, { useProto3Json: true });
  }

  formatJSON(value: AnyJs): string {
    return JSON.stringify(value);
  }

  atob(encoded: string): string {
    return atob(encoded);
  }

  btoa(raw: string): string {
    return btoa(raw);
  }
}