fatsecret.ts

import hmacsha1 from 'hmacsha1';
import {stringify} from 'query-string';

export enum FatsecretFoodType {
  Brand = 'Brand',
  Generic = 'Generic',
}

export interface FatsecretFood {
  food_id: string;
  food_name: string;
  food_type: FatsecretFoodType;
  food_url: string;
  brand_name?: string;
  food_description?: string;
}

export interface FatsecretResponse {
  foods?: {
    food: FatsecretFood[];
    max_results: number;
    total_results: number;
    page_number: number;
  };
  food?: FatsecretFood;
}

const API_PATH = 'https://platform.fatsecret.com/rest/server.api';
const ACCESS_KEY = 'YOUR_ACCESS_KEY';
const APP_SECRET = 'YOUR_APP_SECRET';
const OAUTH_VERSION = '1.0';
const OAUTH_SIGNATURE_METHOD = 'HMAC-SHA1';

function getOauthParameters(): object {
  const timestamp = Math.round(new Date().getTime() / 1000);
  return {
    oauth_consumer_key: ACCESS_KEY,
    oauth_nonce: `${timestamp}${Math.floor(Math.random() * 1000)}`,
    oauth_signature_method: OAUTH_SIGNATURE_METHOD,
    oauth_timestamp: timestamp,
    oauth_version: OAUTH_VERSION,
  };
}

function getSignature(queryParams: object, httpMethod = 'GET') {
  const signatureBaseString = [
    httpMethod,
    encodeURIComponent(API_PATH),
    encodeURIComponent(stringify(queryParams)),
  ].join('&');
  const signatureKey = `${APP_SECRET}&`;
  return hmacsha1(signatureKey, signatureBaseString);
}

function makeApiCall(methodParams: object, httpMethod = 'GET'): Promise<Response> {
  const queryParams = {
    ...getOauthParameters(),
    ...methodParams,
    format: 'json',
  };
  queryParams['oauth_signature'] = getSignature(queryParams, httpMethod);
  return fetch(`${API_PATH}?${stringify(queryParams)}`, {method: httpMethod});
}

export async function searchFood(query: string, maxResults = 8): Promise<FatsecretResponse> {
  const methodParams = {
    method: 'foods.search',
    max_results: maxResults,
    search_expression: query,
  };
  const response = await makeApiCall(methodParams);
  return response.json();
}

export async function getFood(foodId: string): Promise<FatsecretResponse> {
  const methodParams = {
    method: 'food.get',
    food_id: foodId,
  };
  const response = await makeApiCall(methodParams);
  return response.json();
}