tanglepay-sdk-monorepo/packages/common/src/index.ts

DApp SDK to interact with TanglePay wallets

import {
  JsonRpcError,
  JsonRpcRequest,
  JsonRpcRequestHandler,
  JsonRpcRequestMiddleware,
  JsonRpcResponse,
  MobileWindowSharedContext,
} from './types';
import { Duplex, DuplexOptions } from 'stream';

export * from './types';
export * from './JsonRpcEngine';
export * from './EthereumWeb3Impl';

export class WindowPostStream extends Duplex {
  _isMobile = false;

  set isMobile(v: boolean) {
    this._isMobile = v;
  }

  constructor(opts?: DuplexOptions) {
    const merged = Object.assign(opts ?? {}, {
      readableObjectMode: true,
      writableObjectMode: true,
    });
    super(merged);

    window.addEventListener(
      'message',
      (e) => {
        const data = e.data;
        this.push(data);
      },
      false,
    );
  }

  _write(
    chunk: any,
    encoding: BufferEncoding,
    callback: (error?: Error | null) => void,
  ) {
    const sharedContext = window as unknown as MobileWindowSharedContext;
    if (this._isMobile && sharedContext.ReactNativeWebView) {
      sharedContext.ReactNativeWebView.postMessage(JSON.stringify(chunk));
    } else {
      window.postMessage(chunk, '*');
    }
    callback();
  }

  _read(size: number) {
    return undefined;
  }
}