lasuite-docs/src/frontend/apps/impress/src/features/service-worker/RequestSerializer.ts

export type RequestData = {
  url: string;
  method?: string;
  headers: Record<string, string>;
  body?: ArrayBufferLike;
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  [key: string]: any;
};

const serializableProperties: Array<keyof Request> = [
  'method',
  'referrer',
  'referrerPolicy',
  'mode',
  'credentials',
  'cache',
  'redirect',
  'integrity',
  'keepalive',
];

/**
 * RequestSerializer helps to manipulate Request objects.
 */
export class RequestSerializer {
  private _requestData: RequestData;

  static async fromRequest(request: Request): Promise<RequestSerializer> {
    const requestData: RequestData = {
      url: request.url,
      headers: {},
    };

    for (const prop of serializableProperties) {
      if (request[prop] !== undefined) {
        requestData[prop] = request[prop];
      }
    }

    request.headers.forEach((value, key) => {
      requestData.headers[key] = value;
    });

    if (request.method !== 'GET') {
      requestData.body = await request.clone().arrayBuffer();
    }

    return new RequestSerializer(requestData);
  }

  public static arrayBufferToString(buffer: ArrayBufferLike) {
    const decoder = new TextDecoder();
    return decoder.decode(buffer as ArrayBuffer);
  }

  public static arrayBufferToJson<T>(buffer: ArrayBufferLike) {
    const jsonString = RequestSerializer.arrayBufferToString(buffer);
    return JSON.parse(jsonString) as T;
  }

  public static stringToArrayBuffer(str: string) {
    const encoder = new TextEncoder();
    return encoder.encode(str).buffer;
  }

  public static objectToArrayBuffer(ob: Record<string, unknown>) {
    return RequestSerializer.stringToArrayBuffer(JSON.stringify(ob));
  }

  constructor(requestData: RequestData) {
    if (requestData.mode === 'navigate') {
      requestData.mode = 'same-origin';
    }
    this._requestData = requestData;
  }

  toObject(): RequestData {
    const requestDataCopy: RequestData = { ...this._requestData };
    requestDataCopy.headers = { ...this._requestData.headers };
    if (requestDataCopy.body) {
      requestDataCopy.body = requestDataCopy.body.slice(0);
    }
    return requestDataCopy;
  }

  toRequest(): Request {
    const { url, ...rest } = this._requestData;
    return new Request(url, { ...rest, body: rest.body as BodyInit });
  }

  clone(): RequestSerializer {
    return new RequestSerializer(this.toObject());
  }
}