shlink-web-client/src/common/services/HttpClient.ts

import { Fetch } from '../../utils/types';

const applicationJsonHeader = { 'Content-Type': 'application/json' };
const withJsonContentType = (options?: RequestInit): RequestInit | undefined => {
  if (!options?.body) {
    return options;
  }

  return options ? {
    ...options,
    headers: {
      ...(options.headers ?? {}),
      ...applicationJsonHeader,
    },
  } : {
    headers: applicationJsonHeader,
  };
};

export class HttpClient {
  constructor(private readonly fetch: Fetch) {}

  public readonly fetchJson = <T>(url: string, options?: RequestInit): Promise<T> =>
    this.fetch(url, withJsonContentType(options)).then(async (resp) => {
      const json = await resp.json();

      if (!resp.ok) {
        throw json;
      }

      return json as T;
    });

  public readonly fetchEmpty = (url: string, options?: RequestInit): Promise<void> =>
    this.fetch(url, withJsonContentType(options)).then(async (resp) => {
      if (!resp.ok) {
        throw await resp.json();
      }
    });

  public readonly fetchBlob = (url: string): Promise<Blob> => this.fetch(url).then((resp) => resp.blob());
}